Inversi Amplitude Versus Offset untuk Mengetahui Penyebaran Hidrokarbon di Lapangan “X”

Inversion of AVO (Amplitude Versus Offset) can be used to identify and maping the spread of hydrocarbons on seismic data. The research was conducted on the field "X" TAF layer Talang Akar's formation's North West Java basin. AVO inversion performed to obtain angle stack, intercept, gradient and fluid factor attribute. The results of the angle stack analysis indicate AVO anomaly in TAF layer's. Based on the crossplot between the intercept with the gradient, TAFlayer's included in Class III AVO anomaly. The results of fluid factor analysis showed TAF layer's has a negative value, that is estimated to have hydrocarbon potentia

Pengolahan Model Kecepatan Menggunakan Metode Ray Tracing untuk Migrasi Domain Kedalaman (Pre Stack Depth Migration) 2d pada Lapangan “Av”

The research was done to process 2D seismic data by Pre Stack Depth Migration (PSDM) method on Field “AV”. The purpose of this study was to determine the appropriate interval velocity model for PSDM methods work. Interval velocity model obtained from the initial estimate using coherency inversion velocity model is usually not convergent. Interval velocity model should be improved through several stages in order to speed the estimated value closer to the value of actual speed. Some initial interval velocity model parameters should be improved to be more sensitive to lateral velocity variations for PSDM. The method used to improve the velocity model is horizon-based tomography with the concept of ray tracing. These methods made improvements to the speed and geometry of the reflector layer to produce a new interval velocity model. Model errors must be corrected by residual moveout analysis. The best analysis obtained from the fifth iteration to eliminated errors and increased depth value gathers. The exact value of the speed made a good quality image. The results of this research was PSDM Section or PSDM cross-section. The quality of PSDM cross-section was good enough to represented geological structures in the earth's sub surface

Analisa Persebaran Litologi Sandstone Pada Formasi Talang Akar Menggunakan Inversi Extended Elastic Impedance (Eei) Di Lapangan Cilamaya, Cekungan Jawa Barat Utara

Extended Elastic Impedance (EEI) inversion method has been used to analyze sandstone lithology distribution of Talang Akar Formation in Cilamaya Field, North West Java Basin. The target zone was Z2230 layer which located in Talang Akar Formation with litologies of sandstone and shale. Sensitivity analysis showed that gamma-ray and density are sensitive to discriminate the type of lithologies in Z2230 target layer. EEI(58) could simulate gamma-ray and EEI(12) could simulate density with respectively 0,397 and 0,613 correlation values. EEI(12) inversion result showed sandstone lithology distribution in Z2230 layer with 8800 to 9800 . Sandstone lithology distribution concentrated in northwest–southeast of study area. There was hydrocarbon prospect area in north of well OTR-10