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"ABSTRAKHidrokarbon telah ditemukan dan diproduksi di Lapangan ?M?, yang terletak di Sub-cekungan Cipunegara, Cekungan Busur Belakang Jawa Baratlaut, dari level yang lebih dalam, yaitu di Formasi Baturaja dan Formasi Talang Akar, sejak awal tahun 2000-an.Minyak dan gas bumi juga telah diproduksi dari level yang lebih dangkal di Formasi Cibulakan Atas di Cekungan Jawa Baratlaut, tetapi di sub-cekungan yang lain, bukan dari Lapangan ?M? yang berada di Sub-cekungan Cipunegara.Di dalam rangka mencoba menemukan hidrokarbon di Formasi Cibulakan Atas dari Lapangan ?M? ini, keberadaan reservoirnya haruslah diteliti terlebih dahulu. Dengan menggunakan data yang terbatas, yaitu 3 sumur pemboran dan seismik 3D, pemetaan atribut seismik telah dilakukan untuk mengetahui keberadaan reservoir batupasir.RMS amplitude, average amplitude, maximum amplitude, energy half-time, dan arc length, telah diaplikasikan untuk mengetahui keberadaan reservoir batupasir. Keberadaan reservoir batupasir ini akan dapat dipertimbangkan sebagai salah satu faktor dari sistem petroleum di daerah ini.

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ABSTRACT

Hydrocarbon has been discovered and produced in the ?M? Field, located in the Cipunegara Sub-basin, Northwest Java Back Arc Basin, from deeper levels of the Baturaja and Talang Akar Formations since early of 2000s. Oil and gas has also been produced in the shallower level of the Upper Cibulakan Formation in this Northwest Java Basin, but in the other sub-basin, not in the ?M? Field in the Cipunegara Sub-basin.

Prior to find hydrocarbon in the Upper Cibulakan Formation of this field, the existing of its reservoir should be evaluated. Based on a limited data of 3 wells and a 3D seismic, several seismic attributes mapping has been used to define the reservoir of sandstone.

RMS amplitude, average amplitude, maximum amplitude, energy half-time, and arc length, have been applied in defining the sandstone reservoir. This sandstone reservoir could be considered further in studying the petroleum system in the area."

"[ABSTRAKAplikasi atribut seismik 3D dan sifat fisik batuan telah dapat memodelkan reservoar AFormasi Ledok Lapangan X Blok Cepu. Beberapa atribut seismik yang sesuai untukmengidentifikasi penyebaran reservoar dilapangan ini adalah root mean square (rms),sweetness, dan impedansi akustik relatif. Dimana ketiga atribut seismik tersebutmemperlihatkan suatu anomali amplitudo berupa bright spot yang diidentifikasi sebagaireservoar A dan memperlihatkan pola penyebaran berarah selatan-utara. Fasies reservoarA yang merupakan batugamping pasiran adalah reservoar yang sangat baik dalammenyimpan hidrokarbon gas dengan porositas 19% dan saturasi air sebesar 40%. Adanyafaktor ketidakpastian dalam penentuan batas penyebaran reservoar A dari atribut seismik,model reservoar A di bagi menjadi tiga bagian yaitu perkiraan optimis (P90), perkiraansedang (P50) dan perkiraan pesimis (P10). Keberadaan hidrokarbon gas di Lapangan Xdikontrol oleh suatu perangkap stratigrafi bukan perangkap struktur hal ini terlihat daritidak adanya tutupan (klosur). Berdasarkan sebaran reservoar melalui integrasi atributseismik, properti batuan dan model reservoar diusulkan 4 (empat) sumur pemboran untukmengembangkan lapangan gas X.

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ABTRACTApplication of 3D seismic attributes and physical properties of reservoir rocks have been tomodel the formation Ledok A Field X Cepu Block. The seismic attributes, which can be usedto identify distribution of the reservoir in this field were the root mean square (rms),sweetness, and relative acoustic impedance. The attributes of the seismic amplitude anomalyshows a bright spot in the form identified as reservoars A and show the pattern of northsouthtrending deployment. A reservoir facies which is a sandy limestone reservoir was verygood at keeping a hydrocarbon gas with 19% porosity and water saturation of 40%. Theexistence of uncertainty in the determination of reservoir distribution limit of seismicattributes. A reservoir model was divided into three parts, optimistic estimate (P90),moderate estimate (P50) and pesimistic estimate (P10). The existence of hydrocarbon gasesin field X in was control by a stratigraphic traps compared to traps structure as seen fromthe absence of cover (closur). Based on integration of seismic attributes, rock properties andreservoar model proposed four (4) wells drilling to develop the gas field X.;Application of 3D seismic attributes and physical properties of reservoir rocks have been tomodel the formation Ledok A Field X Cepu Block. The seismic attributes, which can be usedto identify distribution of the reservoir in this field were the root mean square (rms),sweetness, and relative acoustic impedance. The attributes of the seismic amplitude anomalyshows a bright spot in the form identified as reservoars A and show the pattern of northsouthtrending deployment. A reservoir facies which is a sandy limestone reservoir was verygood at keeping a hydrocarbon gas with 19% porosity and water saturation of 40%. Theexistence of uncertainty in the determination of reservoir distribution limit of seismicattributes. A reservoir model was divided into three parts, optimistic estimate (P90),moderate estimate (P50) and pesimistic estimate (P10). The existence of hydrocarbon gasesin field X in was control by a stratigraphic traps compared to traps structure as seen fromthe absence of cover (closur). Based on integration of seismic attributes, rock properties andreservoar model proposed four (4) wells drilling to develop the gas field X.;Application of 3D seismic attributes and physical properties of reservoir rocks have been tomodel the formation Ledok A Field X Cepu Block. The seismic attributes, which can be usedto identify distribution of the reservoir in this field were the root mean square (rms),sweetness, and relative acoustic impedance. The attributes of the seismic amplitude anomalyshows a bright spot in the form identified as reservoars A and show the pattern of northsouthtrending deployment. A reservoir facies which is a sandy limestone reservoir was verygood at keeping a hydrocarbon gas with 19% porosity and water saturation of 40%. Theexistence of uncertainty in the determination of reservoir distribution limit of seismicattributes. A reservoir model was divided into three parts, optimistic estimate (P90),moderate estimate (P50) and pesimistic estimate (P10). The existence of hydrocarbon gasesin field X in was control by a stratigraphic traps compared to traps structure as seen fromthe absence of cover (closur). Based on integration of seismic attributes, rock properties andreservoar model proposed four (4) wells drilling to develop the gas field X., Application of 3D seismic attributes and physical properties of reservoir rocks have been tomodel the formation Ledok A Field X Cepu Block. The seismic attributes, which can be usedto identify distribution of the reservoir in this field were the root mean square (rms),sweetness, and relative acoustic impedance. The attributes of the seismic amplitude anomalyshows a bright spot in the form identified as reservoars A and show the pattern of northsouthtrending deployment. A reservoir facies which is a sandy limestone reservoir was verygood at keeping a hydrocarbon gas with 19% porosity and water saturation of 40%. Theexistence of uncertainty in the determination of reservoir distribution limit of seismicattributes. A reservoir model was divided into three parts, optimistic estimate (P90),moderate estimate (P50) and pesimistic estimate (P10). The existence of hydrocarbon gasesin field X in was control by a stratigraphic traps compared to traps structure as seen fromthe absence of cover (closur). Based on integration of seismic attributes, rock properties andreservoar model proposed four (4) wells drilling to develop the gas field X.]"