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Abstrak :
Oil Shale merupakan salah satu bahan bakar non konvensional berbentuk sedimen batuan halus, yang dapat menjadi sumber energi alternatif. Dalam proses retorting, Oil Shale dapat dikonversi menjadi shale oil dan shale gas. Sebelumnya, terdapat beberapa penelitian yang membahas potensi shale gas untuk memproduksi gas hidrogen. Pada penelitian ini, dilakukan pemodelan sistem menggunakan Aspen Plus untuk mengetahui potensi pemanfaatan keseluruhan shale oil beserta shale gas hasil dari retorting untuk memproduksi hidrogen menggunakan teknologi chemical looping. Selain itu, penelitian ini bertujuan untuk mengetahui efisiensi energi dari sistem apabila meneruskan tahapan produksi hidrogen hingga ke tahap produksi ammonia untuk penyimpanan. Berdasarkan hasil simulasi, produk retorting dari 0,126 kg/s bahan baku oil shale komposisi New Albany, yaitu 0,0063 kg/s shale oil dan 0,0024 kg/s shale gas, dapat memproduksi hidrogen sebanyak 0,0037 kg/s. Hidrogen ini dapat dikonversi menjadi ammonia sebanyak 0,012 kg/s dengan sisa hidrogen sebanyak 0,00089kg/s. Berdasarkan analisis energi, didapatkan efisiensi dari keseluruhan proses oil shale retorting hingga produksi ammonia adalah sebesar 55%. ......Oil shale is one of the non-conventional fuel in the form of fine rock sediments, which can be utilized as an alternative energy resource. In the retorting process, Oil Shale is converted into shale oil and shale gas. Previously, there were several studies that discussed the potential utilization of the shale gas product to produce hydrogen gas. In this study, a simulation was carried out using Aspen Plus to determine the potential of using both shale oil and shale gas products from the retorting process, to produce hydrogen using a chemical looping system. In addition, this study is aimed at analysing the energy efficiency of the system with the additional process of converting hydrogen into ammonia for storage. Based on the simulation results, the retorting product from 0,126 kg/s of oil shale, respectively 0,0063 kg/s and 0,024 kg/s of shale oil and shale gas, could produce 0,0031 kg/s of hydrogen. This amount of hydrogen could be converted into 0,012 kg/s of ammonia, with a remaining hydrogen product of 0,00089 kg/s. Based on the energy analysis, the efficiency of the entire system from the oil shale retorting process up to the ammonia production is 55%.

Abstrak :
[Saat ini, jumlah kandungan minyak dan gas konvensional yang tersedia semakin terbatas sedangkan cadangan semakin rendah. Oleh karena itu diperlukan eksplorasi akan sumber daya baru, salah satu solusinya adalah dengan memperluas eksplorasi hidrokarbon dengan cara konvensional maupun unconvensional, dan untuk mengurangi tingginya kegagalan dalam tahapan eksplorasi ini maka diperlukan pembelajaran petroleum system terutama source rock. Source rock yang memiliki potensi tinggi harus mempunyai kandungan kerogen yang cukup untuk dapat mengenerateminyak maupun gas ke perangkap-perangkap hidrokarbon disekitarnya.Dalam penelitian ini memaparkan aplikasi metode Passey dan untuk memetakan source rock dengan kandungan TOC yang berbeda-beda di setiap kedalaman dan responnya pada seismik inversi, kemudian dihitung potensinya sehingga didapat peta penyebaran source rock dan total hidrokarbon yang sudah tergenerate ke perangkap-perangkap struktur maupun yang masih tersisa di dalam source rock itu sendiri.Penelitian ini pun mengintegrasikan data geokimia, analisa petrofisika, dan teknik seismik inversi dalam mengkarakterisasi zona yang berpotensi. Tahapan awal eksplorasi dalam penentuan sweetspot adalah dengan menggunakan metode passey untuk menghasilkan data log pseudo TOC. Kedua, melakukan analisa petrofisika untuk mendapatkan parameter fisis yang sensitif pada formasi target.Ketiga adalah dengan mengaplikasikan seismik inversi Impedansi akustik (AI) untuk mengetahui persebaran batuserpih yang mengandung potensi gas berdasarkan nilai TOC dan parameter fisis yang sensitif pada formasi target.Keempat melakukan penghitungan sumber daya yang sudah tergenerate dan yang masih tersisa dalam tubuh shale sebagai source rock;Currently, the amount of available conventional gas and oil content are more limited while the amount of reserves has been decreased. Therefore we need an exploration of new resources, one solution is to expand the exploration of hydrocarbons by means of conventional or unconvensional, and to reduce the high failure in the exploration phase of the learning required for this petroleum system primarily source rock. Source rock that has high potential must have a sufficient content of kerogen to oil or gas can be generate to the hydrocarbon traps nearby. In this research exposes Passey Method and application method to map the source rock TOC content varies with each depth and seismic inversion, the response was then calculated its potential so obtained a map of the spread of source rock and hydrocarbon that already total generated to structures trap as well as those still remaining in the source rock itself. In this study integrates geochemical data, analysis of petrophysic, and seismic inversion technique to characterize potential zones. Early stages of exploration in the determination of sweetspot is using Passey Method to generate pseudo TOC. Second, petrophysical analysis to obtain physical parameters that are sensitive to the target formation. Third is by applying accustic impedance seismic inversion to determine the distribution of shale rock that contain gas potential based on the value of TOC and physical parameters that are sensitive to the target formation. Fourth do calculating resources have generated and remaining in a shale as source rock;Currently, the amount of available conventional gas and oil content are more limited while the amount of reserves has been decreased. Therefore we need an exploration of new resources, one solution is to expand the exploration of hydrocarbons by means of conventional or unconvensional, and to reduce the high failure in the exploration phase of the learning required for this petroleum system primarily source rock. Source rock that has high potential must have a sufficient content of kerogen to oil or gas can be generate to the hydrocarbon traps nearby. In this research exposes Passey Method and application method to map the source rock TOC content varies with each depth and seismic inversion, the response was then calculated its potential so obtained a map of the spread of source rock and hydrocarbon that already total generated to structures trap as well as those still remaining in the source rock itself. In this study integrates geochemical data, analysis of petrophysic, and seismic inversion technique to characterize potential zones. Early stages of exploration in the determination of sweetspot is using Passey Method to generate pseudo TOC. Second, petrophysical analysis to obtain physical parameters that are sensitive to the target formation. Third is by applying accustic impedance seismic inversion to determine the distribution of shale rock that contain gas potential based on the value of TOC and physical parameters that are sensitive to the target formation. Fourth do calculating resources have generated and remaining in a shale as source rock, Currently, the amount of available conventional gas and oil content are more limited while the amount of reserves has been decreased. Therefore we need an exploration of new resources, one solution is to expand the exploration of hydrocarbons by means of conventional or unconvensional, and to reduce the high failure in the exploration phase of the learning required for this petroleum system primarily source rock. Source rock that has high potential must have a sufficient content of kerogen to oil or gas can be generate to the hydrocarbon traps nearby. In this research exposes Passey Method and application method to map the source rock TOC content varies with each depth and seismic inversion, the response was then calculated its potential so obtained a map of the spread of source rock and hydrocarbon that already total generated to structures trap as well as those still remaining in the source rock itself. In this study integrates geochemical data, analysis of petrophysic, and seismic inversion technique to characterize potential zones. Early stages of exploration in the determination of sweetspot is using Passey Method to generate pseudo TOC. Second, petrophysical analysis to obtain physical parameters that are sensitive to the target formation. Third is by applying accustic impedance seismic inversion to determine the distribution of shale rock that contain gas potential based on the value of TOC and physical parameters that are sensitive to the target formation. Fourth do calculating resources have generated and remaining in a shale as source rock]

Abstrak :
[ABSTRAK
Material serpih adalah sejenis serpih minyak yaitu material clay atau karbonat yang mengandung banyak organik belum matang, apabila dipanaskan pada suhu tertentu, kandungan organiknya menjadi matang dan berubah secara fisika dan kimia, sehingga dapat menghasilkan bahan energi seperti migas. Dalam penelitian ini campuran material dimodifikasi dengan perbandingan: A=B, AB dan AB. Pengujian TOC menghasilkan clay-organik (SMC) dan karbonat-organik (SMK) menunjukkan kualitas yang sangat baik sebagai serpih minyak (TOC≥12.0%), yang diperkuat hasil analisis SEM (morfologi dan komposisi) dan XRD (interaksi dua material). Hasil analisis Termogravimetri menunjukkan energi aktivasi material serpih clay (209-355 kJ/mol) lebih kecil dibanding karbonat (749-1339 kJ/mol), dan temperatur untuk proses reaksi material serpih clay (40-600OC) lebih kecil dibanding karbonat (75-740OC). Karakteristik tersebut menyebabkan tingkat maturasi material serpih clay lebih cepat dibanding karbonat, diperkuat Tmax serpih clay (315-323OC) lebih kecil dibanding Tmax serpih karbonat (415-493OC). CEC 2 (serpih minyak) memiliki karakteristik yang sama dengan serpih clay (Ea=239 kJ/mol dan T=40- 600OC). OD1-Ast3 memiliki tingkat maturasi yang paling bagus (Ea=234 kJ/mol dan Tmax=315OC) sesuai dengan serpih minyak (CEC 2). Hasil pengujian Rock Eval Pyrolisis menunjukkan material serpih clay dan karbonat mempunyai potensi tinggi (menghasilkan oil dan gas). Hasil pemanasan material serpih diperkuat oleh hasil pengujian FTIR yaitu senyawa dengan gugus fungsi tertentu terlepas dan muncul puncak baru di bilangan gelombang 2900 cm-1 yang menunjukkan keberadaan hidrokarbon ikatan tunggal dari rantai karbon panjang C-H.;

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ABSTRACT
The material is a kind of shale oil shale is clay or carbonate material containing organic many immature, when heated to a certain temperature, the organic content of becoming mature and change in physics and chemistry, so it can produce energy materials such as oil and gas. In this study a mixture of materials modified by comparison: A=B, AB and A>B. TOC testing of clay-organic (SMC) produce and organic carbonates (SMK) demonstrate excellent quality as shale oil (TOC≥12.0%), which confirmed the results of scanning electron microscopy (SEM) analysis (morphology and composition) and X-ray diffraction (XRD) (interaction of two materials). The results of thermogravimetric analysis showed activation energy shale clay material (209-355 kJ/mol) is smaller than the carbonate (749-1339 kJ/mol), and the temperature of the reaction process shale clay material (40-600OC) is smaller than the carbonate (75- 740OC). These characteristics cause the maturation level of clay shale material faster than carbonate, shale clay reinforced Tmax (315-323OC) is smaller than Tmax flakes carbonate (415-493OC). CEC 2 (shale oil) has the same characteristics as the flakes of clay (Ea=239 kJ/mol and T=40-600OC). OD1-Ast3 have the most good maturation rate (Ea=234 kJ/mol and Tmax=315OC) in accordance with the shale oil (CEC 2). Test results show the Rock Eval Pyrolisis clay shale and carbonate material has a high potential (produce oil and gas). Results heating shale material reinforced by FTIR testing results are compounds with specific functional groups apart and a new peak appeared at wavenumber 2900 cm-1 which indicate the presence of hydrocarbons single bonds of the carbon chain length of CH.;The material is a kind of shale oil shale is clay or carbonate material containing organic many immature, when heated to a certain temperature, the organic content of becoming mature and change in physics and chemistry, so it can produce energy materials such as oil and gas. In this study a mixture of materials modified by comparison: A=B, AB and A>B. TOC testing of clay-organic (SMC) produce and organic carbonates (SMK) demonstrate excellent quality as shale oil (TOC≥12.0%), which confirmed the results of scanning electron microscopy (SEM) analysis (morphology and composition) and X-ray diffraction (XRD) (interaction of two materials). The results of thermogravimetric analysis showed activation energy shale clay material (209-355 kJ/mol) is smaller than the carbonate (749-1339 kJ/mol), and the temperature of the reaction process shale clay material (40-600OC) is smaller than the carbonate (75- 740OC). These characteristics cause the maturation level of clay shale material faster than carbonate, shale clay reinforced Tmax (315-323OC) is smaller than Tmax flakes carbonate (415-493OC). CEC 2 (shale oil) has the same characteristics as the flakes of clay (Ea=239 kJ/mol and T=40-600OC). OD1-Ast3 have the most good maturation rate (Ea=234 kJ/mol and Tmax=315OC) in accordance with the shale oil (CEC 2). Test results show the Rock Eval Pyrolisis clay shale and carbonate material has a high potential (produce oil and gas). Results heating shale material reinforced by FTIR testing results are compounds with specific functional groups apart and a new peak appeared at wavenumber 2900 cm-1 which indicate the presence of hydrocarbons single bonds of the carbon chain length of CH., The material is a kind of shale oil shale is clay or carbonate material containing organic many immature, when heated to a certain temperature, the organic content of becoming mature and change in physics and chemistry, so it can produce energy materials such as oil and gas. In this study a mixture of materials modified by comparison: A=B, AB and A>B. TOC testing of clay-organic (SMC) produce and organic carbonates (SMK) demonstrate excellent quality as shale oil (TOC≥12.0%), which confirmed the results of scanning electron microscopy (SEM) analysis (morphology and composition) and X-ray diffraction (XRD) (interaction of two materials). The results of thermogravimetric analysis showed activation energy shale clay material (209-355 kJ/mol) is smaller than the carbonate (749-1339 kJ/mol), and the temperature of the reaction process shale clay material (40-600OC) is smaller than the carbonate (75- 740OC). These characteristics cause the maturation level of clay shale material faster than carbonate, shale clay reinforced Tmax (315-323OC) is smaller than Tmax flakes carbonate (415-493OC). CEC 2 (shale oil) has the same characteristics as the flakes of clay (Ea=239 kJ/mol and T=40-600OC). OD1-Ast3 have the most good maturation rate (Ea=234 kJ/mol and Tmax=315OC) in accordance with the shale oil (CEC 2). Test results show the Rock Eval Pyrolisis clay shale and carbonate material has a high potential (produce oil and gas). Results heating shale material reinforced by FTIR testing results are compounds with specific functional groups apart and a new peak appeared at wavenumber 2900 cm-1 which indicate the presence of hydrocarbons single bonds of the carbon chain length of CH.]

Abstrak :
Lempung serpih yang biasa dikenal dengan clayshale ketika belum mengalami pelapukan memiliki kemampuan untuk menahan beban yang cukup tinggi. Ketika mengalami pelapukan dengan paparan cuaca yang ekstrim, tanah ini akan menjadi sangat rentan dan rawan apabila dibangun bangunan diatasnya. Propylene Glycol dan Kalium Klorida diduga mampu mengurangi sifat dari lempung serpih dan dapat meningkatkan kestabilannya, namun sebaliknya kedua bahan kimia ini membuat spesimen lempung serpih mengalami penurunan kemampuan untuk menahan beban. Maka dari itu dilakukan studi dengan metode analisis balik untuk melihat berapa besar faktor keamanan dan pergeseran yang terjadi pada lempung serpih pada berbagai variasi perbaikan yang dilakukan dengan bantuan perangkat lunak Plaxis 2D dalam menyimulasikan perilaku tanah. ......Lempung Serpih commonly known as clayshale when it is not weathered, the ability to withstand the load becomes quite high, but when it is weathered with extreme weather, the soil will become very vulnerable specially when buildings are built on it. Propylene Glycol and Potassium Chloride are considered capable reducing clay shale and improve their stability, but these two chemicals make clayshale have decreased ability to withstand. Therefore, a back-analysis method was conducted to see how much safety factor and displacement occurred to clayshale in various variations of repairs carried out with Plaxis 2D software in simulating soil behavior.

Abstrak :
A detailed combined geological and geophysical study in North Sumatra basin has shown that prospective formations for shale play containing gas sweet spots are found to be shales from Bampo, Belumai, and Baong Formations. Bampo Formations Exhibits low shale gas potential with very low to medium in organic material contents, maturity index of immature to mature, and moderate brittleness. Rocks within the formation tent to be reactive to highly reactive to water, with a moderate degree of swelling capacity. Porosity varies within 5.8-7.4% with permeability raging from 0.37 to 3.2 mD. Sweet spots in the formation found around Basilam-l and Securai-l wells occupy about 21% of the formation. On the other hand, Belumai Formation shows moderate to good shale gas potential, with low to high organic material contents, immature to mature levels of maturity, and moderately brittle to brittle. Sweet spots areas in the formation fpund around the two wells are about 29% of the formation. For Baong Formation, analysis reveals moderate to good shale gas potential, with low to medium contents of organic material, immature to mature in maturity index, moderately brittle to brittle in brittleness, and tendency of being reactive to highly reactive to water but with low degree of swelling capacity. Sweet spots in the formation found around two wells occupies are roughly 11% of the total formation volume in the area. Basin modeling leading to gas resources estimation for Baong, Belumai, and Bampo Formations has led to estimated volumes of 6, 379 TCF, 16, 994 TCF, and 25,024 TCF, respectively, with a total amount of 48, 397 TCF. The resources figures are speculative in nature and do not incorporate any certainty and efficiency factors.

Abstrak :
Penelitian ini melakukan identifikasi lapisan shale gas menggunakan Inversi Impedansi Akustik dan Dekomposisi Spektral. Penelitian dilakukan di Lapangan "AP", Cekungan Barito dan formasi target yaitu Formasi Tanjung. Nilai Total Organic Carbon (TOC) ditentukan dengan menggunakan Passey's Number dan data geokimia. Selanjutnya, zona shale gas ditentukan dengan mengorelasikan Log Gamma-ray dengan Log Densitas, Sonic, NPHI, dan Resistivitas pada dua sumur. Hasil korelasi menunjukkan terdapat zona shale gas pada masing-masing sumur, yaitu dikedalaman 7130-7370 ft (Sumur A-1) dan 3100-3280 ft (Sumur P-1). Zona shale gas Sumur A-1 dan Sumur P-1 memiliki TOC rata-rata 5.4 wt% dan 2.8 wt%. Hasil tersebut didukung oleh hasil inversi impedansi akustik (AI) yang menujukkan nilai impedansi rendah untuk zona shale gas antara 5000-8000 m/s*g/cc (Line A-1), dan 7200-8900 m/s*g/cc (Line P-1). Selain itu, hasil tersebut juga didukung oleh hasil dekomposisi spektral yang menunjukkan anomali Continuous Wavelet Transform (CWT) tinggi pada frekuensi 18 Hz (untuk Line A-1) dan 20 Hz (untuk Line P-1). Analisis terintegrasi antara data seismik, hasil inversi AI dan CWT menunjukkan terdapat daerah potensial shale gas pada punggungan antilkin di Line A-1 dan Line P-1.

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This study identify shale gas layer using acoustic impedance (AI) and spectral decomposition. The object of this study is Field ‘AP’, Barito Basin, and the formation target is Tanjung Formation. Total Organic Carbon (TOC) values was determined using Passey’s Number and geochemical data. Furthermore, shale gas zone was determined by correlating Gamma-ray log with Density, Sonic, NPHI and Resistivity log in two wells. Correlation result showed there are a shale gas zone in each well, which is at 7130-7370 ft (Well A-1) and 3100-3280 ft (Well P-1). Shale gas zone Well A-1 and P-1 has average TOC of 5.4 wt% and 2.8 wt%. These results are supported by calculation of AI inversion, which showed a low impedance values for shale gas zone between 5000-8000 m/s*gr/cc (Line A-1) and 7200-8900 m/s*gr/cc (Line P-1). Besides, spectral decomposition also showed high CWT anomaly at 18 Hz (Line A-1) and 20 Hz (Line P-1). Integrated analysis of seismic data, AI, and CWT indicates there are potentials area of shale gas on the anticline ridge on Line A-1 and Line P-1.

Abstrak :
Lempung serpih yang belum mengalami pelapukan memiliki kekuatan yang cukup tinggi. Saat mengalami pelapukan, lempung serpih akan mengalami perubahan fisik serta kehilangan kekuatannya, sehingga sangat rawan apabila dijadikan material timbunan. Propylene glycol dan Kalium Klorida mampu mengurangi sifat lempung serpih yang rentan terhadap air sehingga kestabilannya meningkat. Propylene Glycol yang dicampurkan pada lempung serpih meningkatkan nilai CBR soaked melebihi 100 dan menurunkan nilai pengembangan dari 2,5 menjadi 0,3 dibanding spesimen asli. Kalium klorida juga meningkatkan nilai CBR Soaked sebesar 100 dan menurunkan nilai pengembangan hingga menjadi 0,1. Namun campuran keduanya tidak meningkatkan nilai CBR soaked dan membuat spesimen mengalami penurunan.

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Unweathered clayshale has high value of strength. Due to brittleness of weathering, clayshale will deforms and loses its strength. Thus, it would be hazardous if it is used as embankment material. Propylene glycol and Pottasium Chloride are able to increase the stability of clay shale making it more durable when contact with water and atmosphere. Propylene glycol, which is mixed to the clay shale increases the value of soaked CBR exceeds 100 , and decrease the swelling number from 2,5 to 0,3 from the original specimen. Pottasium Chloride also increases the value of soaked CBR exceeds 100 , and decrease the swelling number to 0,1 . Yet the mixture of Propylene Glycol and Pottasium Chloride are not able the Value of soaked CBR and makes a settlement to the specimen.

Abstrak :
Penelitian ini bertujuan untuk mendapatkan nilai sifat atau sifat fisik dan parameter kuat geser dari tanah ekspansif dan tanah lempung serpih. Sampel tanah tanah ekspansif dan clay shale diambil langsung dari lokasi pengumpulan dengan metode mesin bor untuk pengujian laboratorium nanti. Hasil yang diperoleh adalah nilai berat jenis 2,707 untuk tanah lempung serpih dan 2.719 - 2.738 untuk lahan ekspansif, dari hasil tersebut diklasifikasikan sebagai tanah lempung non organik. Hasil yang didapat dari pengujian hidrometer dan Analisis saringan untuk tanah clay shale berupa fraksi clay 43% dan lanau 57%, sedangkan untuk tanah ekspansif fraksi lempung berkisar antara 34% - 42% dan lumpur 58% - 66%. Dari hasil pengujian, kedua jenis tanah tersebut diklasifikasikan sebagai jenis tanah lumpur tanah liat. Selain itu, dari hasil pengujian batas atterberg Artinya, tanah ekspansif dan clay shale soil merupakan jenis tanah memiliki plastisitas dan potensi ekspansi yang relatif tinggi. Hasil Ini bersama-sama dengan hasil parameter kekuatan geser kemudian dibandingkan baik tanah maupun dengan penelitian sebelumnya yang akan diperoleh karakteristik tanah lempung serpih dan tanah ekspansif. ......This study aims to obtain the value of physical properties or traits and the parameter of shear strength of expansive soil and shale clay. Soil samples for expansive soil and clay shale were taken directly from the collection site using a drilling machine method for later laboratory testing. The result obtained is a specific gravity value of 2.707 for clay soil shale and 2,719 - 2,738 for expansive land, from these products classified as non organic clay. The results obtained from hydrometer testing and sieve analysis for clay shale soil were clay fraction 43% and silt 57%, while for expansive soil the clay fraction ranged from 34% - 42% and mud 58% - 66%. From the test results, the two types of soil are classified as soil types clay mud. In addition, from the results of atterberg limit testing This means that expansive soil and clay shale soil are types of soil has relatively high plasticity and expansion potential. Result This together with the results of the shear strength parameters are then compared with both the soil and previous studies which will obtain the characteristics of the shale clay and expansive soil.

Abstrak :
ABSTRAK
Hasil dekomposisi spektral dengan menggunakan metode Smoothed Pseudo Wigner-Ville Distribution (SPWVD) digunakan untuk mengestimasi nilai atenuasi pada data seismik. Tujuan tugas akhir ini adalah untuk mengkarakterisasi reservoar shale pada formasi Gumai yang terletak di Lapangan Abiyoso yang berada di sub cekungan Jambi, cekungan Sumatera Selatan dengan menggunakan dekomposisi spektral. Tahapan pertama yang dilakukan adalah analisis petrofisika dan analisis crossplot untuk mengarakterisasi lapisan reservoar shale. Karakterisasi lebih lanjut dilakukan dengan overlay kurva DlogR dan kurva Transit time sonik. Dari ketiga zona shale yang diprediksi, diperlihatkan bahwa lapisan batuan lempung pada zona Shale 1 merupakan lapisan batuan lempung yang diduga reservoar. Hasil tersebut didukung pula oleh estimasi nilai atenuasi dari dekomposisi spektral. Selanjutnya dekomposisi spektral diteruskan untuk data seismik secara keseluruhan sehingga didapatkan estimasi persebaran reservoar lapisan batuan lempung pada data seismik.

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ABSTRACT
The results of spectral decomposition using Smoothed Pseudo Wigner-Ville Distribution (SPWVD) is used to estimate the value of attenuation on seismic data. The purpose of this thesis is to characterize shale reservoir in Gumai Formation at Abiyoso Field in Jambi Sub Basin, South Sumatera Basin. The first stage,it is carried out petrophysical analysis and crossplot analysis to characterize shale reservoir layer. Further characterization is done by overlaying DlogR and Sonic transit time curve. Based on the three predicted shale zone, it is shown that shale layer at Shale zone 1 is estimated the layer of shale reservoir. These results are confirmed also by the estimated value of the attenuation of spectral decomposition. Further spectral decomposition is applied to seismic data set to map distribution of shale reservoir.