Capture the variation of the pore pressure with different geological age from seismic inversion study in the Jaisalmer s
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ORIGINAL PAPER
Capture the variation of the pore pressure with different geological age from seismic inversion study in the Jaisalmer sub‑basin, India Raman Chahal1 · Saurabh Datta Gupta1 Received: 5 January 2020 / Accepted: 30 June 2020 © The Author(s) 2020
Abstract Geoscientific evidence shows that various parameters such as compaction, buoyancy effect, hydrocarbon maturation, gas effect and tectonic activities control the pore pressure of sub-surface geology. Spatially controlled geoscientific data in the tectonically active areas is significantly useful for robust estimation of pre-drill pore pressure. The reservoir which is tectonically complex and pore pressure is changing frequently that circumference motivated us to conduct this study. The changes in pore pressure have been captured from the fine-scale to the broad scale in the Jaisalmer sub-basin. Pore pressure variation has been distinctly observed in pre- and post-Jurassic age based on the current study. Post-stack seismic inversion study was conducted to capturing the variation of pore pressure. Analysis of low-frequency spectrum and integrated interval velocity model provided a detailed feature of pore pressure in each compartment of the study area. Pore pressure estimated from well log data was correlated with seismic inversion based result. Based on the current study one well has been proposed where pore pressure was estimated and two distinguished trends are identified in the study zone. The approaches of the current study were analysed thoroughly and it will be highly useful in complex reservoir condition where pore pressure varies frequently. Keywords Pore pressure · Seismic inversion · Clastic and carbonate reservoir
1 Introduction The current study has been concentrated in the Jaisalmer sub-basin area of Rajasthan basin (Fig. 1). The Jaisalmer sub-basin is a matured basin for hydrocarbon exploration. It has been assumed that hydrocarbon has migrated from the Indus basin (Bourah 2010) to the Rajasthan basin in the Cretaceous age. Six major geological formations are present in this area namely, Goru, Pariwar, Bedesir-Baisakhi, Jaisalmer, Lathi and Shumarwali. The reservoir character of this area is the culmination of clastic and carbonate sequences (DGH). Both clastic and carbonate sequence acts as a reservoir rock in the Jaisalmer Edited by Jie Hao * Saurabh Datta Gupta [email protected] Raman Chahal [email protected] 1
Department of Applied Geophysics, Indian Institute of Technology (Indian School of Mines), Dhanbad, Dhanbad, Jharkhand 826004, India
sub-basin. The Jaisalmer limestone is a carbonate sequence and the impactful reservoir for this basin (GSI report on a petrographic study by Bhushan, 1966). A comparatively thin section of the shale unit of Bedesir-Baisakhi formation acts as a cap rock of this limestone reservoir. It has been observed that there are lack of significant hydrocarbon explorations in this sub-basin area due to the complex reservoir structure and presence of discrete facies. This set-up is related t
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