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Abstrak :
[ABSTRAK
Area penelitian merupakan struktur pengembangan pada bagian timur struktur ?Sulis?dengan luas area sekitar 3 km2 dan merupakan kompartemenisasi batupasir. Perbedaan batas minyak air pada sumur-sumur existing mengindikasikan adanya perbedaan facies dan lingkungan pengendapan dari batu pasir. Terbatasnya jumlah sumur produksi serta data geologi pada area penelitian ini yang dapat memperkirakan penyebaran hidrokarbon secara lateral dan perubahan facies batupasir dapat menyebabkan suatu potensi kegagalan dalam memperoleh kandungan hidrokarbon pada pemboran sumur-sumur pengembangan di struktur ?Sulis? ini. Tesis ini membahas metode analisa untuk dapat memperkirakan zona penyebaran hidrokarbon serta perkiraan jenis kandungannya. Perkiraan dari sebaran zona hidrokarbon adalah berdasarkan analisa dari kontras perubahan nilai poisson?s ratio yang tinggi serta adanya respon anomali seismik pada area penelitian. Nilai poisson?s ratio pada kisaran 0.1-0.2 diperkirakan merupakan jenis kandungan gas dan kisaran 0.2 ? 0.3 merupakan jenis kandungan minyak. Data-data yang digunakan berupa data seismik 3D prestack gather dari struktur ?Sulis?, log sonic dan log density sumur acuan X-63 dan diproses menggunakan software Hampson Russell. Analisa AVO ini dilakukan dengan metode forward modelling yang meliputi poses Fluid Replacement Modelling, perhitungan perubahan nilai skala poisson?s ratio serta analisa Amplitude Versus Offset. Hasil analisis yang berupa peta perubahan nilai poisson?s ratio serta respon seismik berupa anomaly amplitude telah dapat digunakan untuk mengidentifikasi zona penyebaran hidrokarbon pada area penelitian di struktur ?Sulis?.

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ABSTRACT
The area of study is development structure at the east of ?Sulis?structure with 3km2 of wide. This area consist of sandstone compartement with variation of deposition environment. The diference of oil water contact at the existing wells were indicated different of sandstone facies and deposition environment. The limitation of production wells and geology data to estimate lateral hydrocarbon distribution and sandstone facies in this area will be a failure risk potential in drilling wells development at?Sulis?structure. The topic of this thesis is discussed about the methode analysis to predict about the distribution and type of hydrocarbon. The estimation of hydrocarbon distribution zone is base on high contrast of poisson?s ratio changed and seismic anomali respons in the area study. The value of Poisson?s ratio in the range 0.1 ? 0.2 is estimated of gas type and in range 0.2 ? 0.3 is estimated of oil type. 3D seismic prestack gather of?Sulis?structure, sonic and density log of existing X- 63 well was used in processing analysis with Hampson Russell software. The AVO analysis is include forward modelling methode, fluid replacement modelling, scaled poisson?s ratio changed and amplitude versus offset. The analysis result of scaled poisson?s ratio changed and amplitude anomalies respons has identified the distribution zones and type of hydrocarbon in area study of ?Sulis? structure.;The area of study is development structure at the east of ?Sulis?structure with 3km2 of wide. This area consist of sandstone compartement with variation of deposition environment. The diference of oil water contact at the existing wells were indicated different of sandstone facies and deposition environment. The limitation of production wells and geology data to estimate lateral hydrocarbon distribution and sandstone facies in this area will be a failure risk potential in drilling wells development at?Sulis?structure. The topic of this thesis is discussed about the methode analysis to predict about the distribution and type of hydrocarbon. The estimation of hydrocarbon distribution zone is base on high contrast of poisson?s ratio changed and seismic anomali respons in the area study. The value of Poisson?s ratio in the range 0.1 ? 0.2 is estimated of gas type and in range 0.2 ? 0.3 is estimated of oil type. 3D seismic prestack gather of?Sulis?structure, sonic and density log of existing X- 63 well was used in processing analysis with Hampson Russell software. The AVO analysis is include forward modelling methode, fluid replacement modelling, scaled poisson?s ratio changed and amplitude versus offset. The analysis result of scaled poisson?s ratio changed and amplitude anomalies respons has identified the distribution zones and type of hydrocarbon in area study of ?Sulis? structure., The area of study is development structure at the east of ?Sulis?structure with 3km2 of wide. This area consist of sandstone compartement with variation of deposition environment. The diference of oil water contact at the existing wells were indicated different of sandstone facies and deposition environment. The limitation of production wells and geology data to estimate lateral hydrocarbon distribution and sandstone facies in this area will be a failure risk potential in drilling wells development at?Sulis?structure. The topic of this thesis is discussed about the methode analysis to predict about the distribution and type of hydrocarbon. The estimation of hydrocarbon distribution zone is base on high contrast of poisson?s ratio changed and seismic anomali respons in the area study. The value of Poisson?s ratio in the range 0.1 ? 0.2 is estimated of gas type and in range 0.2 ? 0.3 is estimated of oil type. 3D seismic prestack gather of?Sulis?structure, sonic and density log of existing X- 63 well was used in processing analysis with Hampson Russell software. The AVO analysis is include forward modelling methode, fluid replacement modelling, scaled poisson?s ratio changed and amplitude versus offset. The analysis result of scaled poisson?s ratio changed and amplitude anomalies respons has identified the distribution zones and type of hydrocarbon in area study of ?Sulis? structure.]

Abstrak :
ABSTRAK

Integrasi pemodelan isi fluida dan analisis seismik AVO untuk memetakan reservoar gas Globigerina limestone melalui simultaneous pre stack inversion telah dilakukan pada Cekungan Jawa Timur, Selat Madura. Penelitian ini memanfaatkan pemodelan ke belakang atau lebih dikenal sebagai inversion modelling. Tujuan dari penelitian ini adalah untuk menggambarkan penyebaran reservoar gas dari Globigerina limestone sehingga hasil analisis kuantitatifnya dapat dijadikan sebagai rujukan didalam pemboran sumur berikutnya. Penelitian diawali dengan pembuatan low frequency model yang optimum yaitu dengan mengintegrasikan pemodelan isi fluida dan analisis seismik AVO. Integrasi keduanya diperlukan mengingat target penelitian banyak terpengaruh oleh zona gas dangkal yang mengakibatkan terdistorsinya puncak dan dasar dari struktur reservoar targetnya. Data penelitian terdiri dari data seismik tiga dimensi (3D) seluas 320km² dengan kerapatan bin size 18.75m x 12.5m disertai dengan dua data sumur. Hasil dari crossplot menunjukan bahwa litologi target reservoar dapat dibedakan dengan litologi non reservoar melalui log Vp dan Vs. Hasil dari crossplot antara impedansi P dan Vp/Vs dapat menunjukkan bagaimana kualitas reservoar gas pada struktur F dan struktur H. Nilai cut-off pada crossplot utama yaitu antara impedansi P dan Vp/Vs adalah sebesar 2.400 - 5.500 gr/cc*m/s dan 2,0 - 2,1 pada rasio cepat rambat gelombang. Hasil dari optimasi low frequency model menunjukkan bahwa pada struktur G, yang merupakan target pemboran berikutnya, respon impedansi P dan Vp/Vs nya analog terhadap kedua struktur F dan H. Hal ini menunjukkan bahwa melalui integrasi pemodelan isi fluida dan analisis seismik AVO, low frequency model dapat dioptimasikan sehingga metode simultaneous seismic inversion mampu memetakan zona-zona reservoar gas lainnya.

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ABSTRACT

Integration of fluid replacement modelling and seismic AVO analysis towards simultaneous seismic inversion had been done to delineate the distribution of Globigerina limestone gas reservoir in Madura Strait, East Java Basin. This study was using backward modelling or well known as inversion modelling to finish the quantitative analysis. The purpose of the study is to map the distribution of Globigerina limestone gas reservoir so that in the end the final result will be used as a guidance to drill the next exploration well. It started with an optimized low frequency model building by integrating fluid replacement modelling and seismic AVO analysis. By integrating these two methods, the distorted reservoir top structure and bottom can be compensated and the low frequency model will be optimized. The availability of the data includes 3D seismic data with acquisition bin size 18.75m x 12.5m, area of 320km², with two well logs. The crossplot result showed that the reservoir and non-reservoir lithology can be distinguished by Vp and Vs log. By analysing the acoustic impedance together with Vp/Vs, the character of gas reservoir at surrounding F and H structures can also be delineated. The main cutoff for acoustic impedance and Vp/Vs were 2,400 - 5,500 gr/cc*m/s and 2.0 - 2.1. The final optimizing result of low frequency model showed that the target G structure, which will be the next exploration target, showed an analogue response with its neighbour F and H structures. It is concluded that by integrating both two methods, fluid replacement modelling and AVO seismic analysis, the optimizing of low frequency model can be achieved and the simultaneous seismic inversion can successfully map other gas reservoir.