Gas-in-place estimate of the habiganj gas field using material balance

Abstract

Habiganj gas field is located approximately 75 miles north of Dhaka in cast-central BMgladcsh. It is perhaps the second largest gas field in Bangladesh after Titas. Therefore, it is extremely important to estimate the correct gas-in-place of this valuable reservoir. Thi, field first started producing in 1969. A total of 10 wells have been drilled till now, For the estimate of the gas-in-place (GIP), many ,tudies have been performed by different organiz~tions The reserve in the Habiganj gas field was estimaled by volumetric and material balance method. By the measurement of moving gas-walercontact, it was established that the field is under moderate to strong bottom-water drive, Although in one of the studies, water inllux was considered lor simulation, most of the matcrial balance calculation inclL1ded no water influx, Only one study estimated the water influx in material balance calculation Thi~ important term omittcd from the calculation raise; doubts on the accuracy of these reserve cstimates, Morcover, the official cstimate of the rescrve was made about len years back The prescnt study allempts to establish the drive mechanism through correct theoretical approach and thcn to estimate the gas-in- place of the Habiganj gas field using material balance including necessary calculation of the water -influx into the reservoir