Reservoir Characterization of Carbonate Facies Towards Hydrocarbon Exploration in Jaisalmer Sub-basin, India

Abstract

The current study has been conducted in Jaisalmer sub-basin which is a part of Rajasthan Basin. This sub-basin has been contained with clastic and carbonate both reservoir facies. The carbonate facies are mostly fractured limestone in the Jaisalmer formation which is just below of Baisakhi-Bedisar clastic sequence. Measurements at all scales from pores to sedimentary basin are analysed and interpreted to generate the micro and macro-geological models. It integrates all the available information to understand the reservoir rock and fluid information to delineate the prospects zone. It helps to simulate the behaviour of fluid and determines the distribution of properties, viz. lithology, porosity and thickness. Seismic reservoir description is a model which incorporates the hydrocarbon storage and production. Few numbers of wells have been drilled in this region, which are dry wells. The current study has been conducted based upon full-stack and partial-stack seismic data only with the help of nearby drilled well and analogue data. AVO analysis, EEI analysis and attribute study over this volume within certain time have shown some encouraging results of the study towards characterizing the carbonate reservoir facies for hydrocarbon exploration. One pseudo-well was positioned as blind well for testing the evaluated result with prospecting location position. The final result has proved that the location was placed at a sweet spot. The more prominent response from AVO analysis may be developed from the better high-resolution data set. In view of volumetric and available data set with this kind of challenging geological reservoir condition, the study has given a satisfactory outcome.