Guspriandoko, Guspriandoko and Sapto Mulyanto, Bagus and Dewanto, Ordas (2017) ANALISIS SEISMIK AMPLITUDE VERSUS OFFSET (AVO) RESERVOAR BATU GAMPING FORMASI KUJUNG PADA LAPANGAN “GPH” CEKUNGAN JAWA TIMUR UTARA. Jurnal Geofisika Eksplorasi. (Submitted)

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Abstract

Amplitude anomaly (dimspot) on a seismic cross section is an indicator of the presence of hydrocarbons in a reservoir. The AVO (Amplitude Versus Offset) method is used to analyze hydrocarbon anomalies based on the reflectivity domain, but in some cases, this method can be used for lithologies and fluids separation. Therefore, further analysis is needed to determine the distribution of potential gases by using AVO attribute in the "GPH" field of northern east Java basin. In this study AVO analysis was performed to identify an anomaly classes, FRM (Fluid Replacement Model) as the fluid substitution concept in the form of model in order to understand the reservoir character. This research showed that the result of FRM modeling from well G-3 and well G-5 which sw = 100%, represent the increased amplitude to offset in well G-3 and 100% gas substitution in well G-5 have decreased ratio between amplitude to offset. Well G-1, G-2, G-3, G-4 in the limestone reservoir of Kujung formation is classified as anomaly class 1 which in the crossplot intercept & gradient, positive intercept and negative gardient are in quadrant IV and the lowest gradient value is 0.05. Clustering process was done to analize the map of near offset and far offset attribute which acquisition angle for the near offset is 0-10o and for the far offset is 20-35o while the direction is NWSE. This showed the clear differencess of amplitude value between the reef which contains brine and the reef which contains gas. In the gardient and intercept crossplot, there was found a potential zona for limestone in every single reef which need to be analized even further.

Item Type: Article
Subjects: Q Science > QC Physics
Q Science > QE Geology
Divisions: Fakultas Teknik (FT) > Prodi Teknik Geofisika
Depositing User: BAGUS SAPT
Date Deposited: 16 Nov 2017 06:53
Last Modified: 16 Nov 2017 06:53
URI: http://repository.lppm.unila.ac.id/id/eprint/5659

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