Abstract:

Abstract: Block D located in the westerncentral of Irrawaddy basin in Burma, has two major Eocene deltaic sedimentary systems with one in the east and the other in the west. The main sedimentary facies include delta plainprodelta and shallow marine facies. Block D experienced three main tectonic evolution phases including the Eocene united subsidence, the OligoceneMiocene differential subsidence and the postPliocene overthrusting. The tectonic framework of Block D is characterized by NStrending and EWzoning “four uplifts, two depressions and one slope”. The quality source rocks in Block D are dominated by the Tabyin Formation gray mudstone and coalseam mudstone, and the Laungshe Formation dark shale. They feature in high organic abundance and high hydrocarbongeneration potential. Moreover, three reservoirseal combinations in the Pengdang, Kabaw and Tabyin formations provide favorable conditions for effective hydrocarbon accumulation and preservation. 〖JP+1〗There are two trap styles in Block D, including anticline trap controlled by faults and sand lens trap. Study〖JP〗 of thermal evolution of source rocks indicates that the timing of hydrocarbon generation, migration, trap formation and reservoirseal combination is rational. The potential plays of Block D mainly occur in three structural belts including Patolon anticline belt, Mahudaung anticline belt and Thingadon synclinorial belt.