3D prestack simultaneous inversion and lame-parameter extraction applied to discriminate the lithology and pore-fluid: Case study—Gumai Formation, Jambi Sub-Basin, South Sumatra

Abstract

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 and LambdaMuRho Extraction 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, low S-Impedance and low density. The Lame parameter extraction, resulted low LambdaRho (Incompressibility) and relatively high MuRho (Rigidity).

Based on these values, combined maps of P-impedance (Zp), S-Impedance (Zs), Density (ρ), LambdaRho (γρ) and MuRho (μρ) show the distribution of the prospective areas for gas bearing sand reservoir towards western part of the study area.

Presentation Date: Wednesday, October 17, 2018

Start Time: 9:20:00 AM

Location: Poster Station 11

Presentation Type: Poster