Anggraeni, Widia and Nursina, Mawar Indah and Syafria, Andri and Mulyatno, Bagus Sapto and Sarkowi, Muh (2018) LITHOLOGY DISCRIMINATION AND PORE-FLUID DETECTION USING 3D PRE-STACK SIMULTANEOUS INVERSION: A CASE STUDY AT GUMAI FORMATION, JAMBI SUB-BASIN, SOUTH SUMATRA. In: The 42th IPA Convention and Excibition 2018, 2-4 Mei 2018, Jakarta (JCC).


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Pre-stack simultaneous inversion is a part of quantitative interpretation as a reservoir characterization tool to identify lithology and pore fluid based on P-wave velocity, S-wave velocity, and density. The Gumai Formation facies architecture is complex and formed by interbedded sand and – shale. The formation has various roles in the Jambi Sub-Basin petroleum system acting as the regional seal, source rock, and reservoir rock. This research was carried out in order to discriminate lithology and detecting pore fluid distribution using Pre-stack Simultaneous Inversion in the Gumai Formation, Jambi sub-basin which is supported by the proven discoveries of hydrocarbon (gas) while Drill Stem Testing (DST). The data consists of 3D seismic partial-angle stacks and well log data which are used as input to three-term Fatti equation to transform the seismic trace into reflectivity. Further, reflectivity from different angle stacks are simultaneously inverted to obtain P-impedance (Zp), S-Impedance (Zs) and Density (ρ). The simultaneous inversion results for gas bearing sand reservoir encased in shale gave low P-Impedance value (15,700-18,250 ft/s*gr/cc or 4,785-5,563 m/s*gr/cc), low S-Impedance value (9,078-10,850 ft/s*gr/cc or 2,767-3,307 m/s*gr/cc) and low density value (2.10-2.19 gr/cc). Based on these values, combined maps of P-impedance (Zp), S�Impedance (Zs) and Density (ρ) show the distribution of the prospective areas for gas bearing sand reservoir towards western part of the study area. keywords: seismic, simultaneous inversion, Gumai Formation, gas reservoir

Item Type: Conference or Workshop Item (Paper)
Subjects: T Technology > T Technology (General)
Divisions: Fakultas Teknik (FT) > Prodi Teknik Geofisika
Depositing User: MUHAMMAD S
Date Deposited: 28 Feb 2023 03:25
Last Modified: 28 Feb 2023 03:25

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