oa An Integrated Analysis for the Re-Assessment of Hydrocarbon Potential of a Low Prospect Area-a Case Study from Jurassic Marrat Reservoir of Burgan Structure in South East Kuwait

Recent discovery of hydrocarbon from Jurassic section in different parts of Kuwait necessitated a relook<br>at Jurassic prospects of Burgan area in the light of better understanding of different elements of<br>hydrocarbon system defining the Jurassic play fairway. An integrated study on interpretation of 3D<br>seismic, fracture, sequence stratigraphy and analysis of reservoir engineering data have enhanced the<br>prospectivity of Jurassic Marrat sediment over Burgan structure. The study brings out the structural<br>features which are in sharp contrast to the earlier subsurface picture. Three sets of fault divide the<br>main Burgan structure into seven different blocks. Earlier drilling activities are found to be confined to<br>four blocks leaving other three blocks as totally untested and unexplored. Petrophysical analysis<br>identified two sections in Middle Marrat as hydrocarbon bearing. The upper section was the better<br>prospect and was tested in five out of six wells drilled earlier, but none of the well threw any light on<br>oil water contact (OWC). The reservoir engineering data supplemented with petrophysics and structural<br>synthesis marks three probable OWCs. A section in the lower part of Middle Marrat, approximately 250<br>ft below the deepest inferred OWC was tested in one well and found oil bearing. The well was found to<br>be drilled 150 ft down the structure and as a result the potential of this section could not be<br>ascertained properly from previous exploratory efforts. The presence of equally prospective equivalent<br>sedimentary section in other drilled wells enhances the Middle Marrat prospect. Sequence Stratigraphic<br>analysis identifies the hydrocarbon bearing zones as a part of Highstand Systems Tract that continues<br>laterally towards north in the Magwa field. The present study has demonstrated the necessity of reassessment<br>of hydrocarbon prospect for partially explored areas by continuous revision incorporating<br>the latest data sets, experiences, concepts and technological advancements.