Identifikasi Persebaran Litologi Reservoar Batupasir Menggunakan Analisis Seismik Inversi Impedansi Elastik Di Lapangan Najlaa Formasi Cibulakan Cekungan Jawa Barat Utara

Harsano Jayadi
Journal article Jurnal Fisika • 2016 Indonesia

Abstract

An inversion has been carried out againts the seismic data of PSTM 3D at Najlaa field in the Northern West Java basin. The method used is elastic impedance to identify lithology and hidrocarbon distribution of sandstones reservoir in the layer of Cibulakan Formation, Z.2210. AVO inversion has been carried out to get intercept, gradient, elastic impedance reflectivity, near angle stack, and angle stack. The AVO graph analyzing and angle stack attribute are used to determine amplitude response of the offset used to determine AVO anomaly class. From the result of sensitivity analysis showed that elastic impedance has the most sensitivity in the separation of sandstones lithology and mudstones in the angle of 30 degree. It is approved in the mapping of lithology distribution. Further crossplot analysis has been carried out between elastic impedance log angle in 30 degree againts gamma ray log to distinguish sandstones lithology and crossplot between lambda-rho log to gamma ray log to determine the indication of hidrocarbon fluids. The result of AVO analysis showed the response in the layer Z.2210 included in IIp AVO anomaly located at twt 1794 ms to 1799 ms in UI-10 well logging. Elastic Impedance mapping 30 degree inline 1141 showed that target zone of sandstones lithology has a value of 1410 (m/s)2*gr/cc to 1570 (m/s)2*gr/cc with region spread of the sandstones distribution in reservoir layers Z.2210 which has an orientation toward Northeast-Southwest. Keywords:   Inversion; AVO; Elastic Impedance

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Jurnal Fisika

Jurnal Fisika is a 6 monthly publication, which contains articles from research from academics, r... see more