Re-Evaluating the Reservoir Gas Sands of Rashidpour Gas Field: A Case Study

Ahmed, Nur ¹
(1)Geology, University of Dhaka, Dhaka-1000, Bangladesh.

Rashidpur Gas Field is located in the west of Srimongal in East Central Bangladesh. The accumulation associated with the Miocene Bhuban- Boka Bil Sandstone Reservoirs in a structural trap. The structure is about 35 km long and 7 km wide with amplitude of some 4900 ft. Rashidpur anticline is a sub-meriodinal axis, elongated, asymmetrical doubly plunging anticline which has two pay sands namely Upper Gas Sand and Lower Gas Sand indicated in all four wells drilled in the structure. After penetrating the shale section beneath LGS, drilling plan was rescheduled to a depth of 9200 ft in order to investigate the deeper sands of potential hydrocarbon accumulation. On reaching a depth of 10,073 ft sudden kick was occurred which halted the drilling operation and forced to kill the well. An immediate sidetrack well (4521 ft) was drilled at well-4 and an existence of a sealing fault was drawn on the final report. But mud logs of well-3 and well-4 based on the hydrocarbon component of UGS and LGS clearly indicates absence of any fault between well-3 and well-4. Recent geological investigation in the study area reveals the updated facts on the two wells of Rashidpur Gas Field. The paper analyses mud logs and other geological data and reevaluates the reservoir gas sands of Rashidpur Gas Field.

AAPG Search and Discovery Article #90135©2011 AAPG International Conference and Exhibition, Milan, Italy, 23-26 October 2011.