High resolution sequence stratigraphy of Lower Cretaceous rocks of the Jaisalmer Basin

Abstract

High resolution sequence stratigraphy is a useful tool to understand the nature of reservoirs and dispersal patterns in relation to the genesis of these clastic reservoirs. Such analyses are performed by integrating the geophysical (electrolog and seismic) and geological (core and sedimentological) data. This study enables us to understand the nature of reservoirs in the 2nd order Lower to Upper Cretaceous sediments of the Jaisalmer Basin, by configuring it into further higher orders (3rd/4th order). The analysis results in identification of ten depositional facies deposited in the lowstand system tract, the transgressive system tract and the high stand system tract. The log based interpretationswere carried out to identify the 4th order sequences; visual gamma log interpretation supported with CWT indicates eight to nine higher order parasequences within the Pariwar Formation. Similarly, seven higher order sequences were identified within Lower Goru and four in Upper Goru and Parh formations. These identified parasequences will help in petroleum system modelling of the Jaisalmer Basin.