缅甸D区块构造特征与油气储层评价

Structural Feature and Oil and Gas Reservoir Analysis of Block D, Myanmar

研究区D区块位于缅甸中部,包括钦敦凹陷北部和沙林凹陷南部,面积12384km2。D区块以南分布有许多油田。其中,Letpanto油田紧临该区块,在D区块内还有许多人工井或油苗,是油气聚集的有利场所,勘探潜力很大。为了研究该区的勘探方向,笔者从区域构造和沉积演化入手,分析研究了该区的生油层、储层和盖层的沉积相带特征和有利的油气聚集带。其中,晚始新世巴当组是始新世地层中产油的储层,为区块主要生油岩系;中新世和渐新世砂岩为良好储层;渐新世尧河组泥岩为较好的盖层;晚中新世到早上新世之间形成的各类局部构造圈闭均可能成为油气聚集场所,展示了良好的油气远景。

Block D is situated in central Myanmar. It occupies an area of 12 384 km^2, stretching from the north of Minbu Basin to the south of Chindwin Basin. Many oil fields are located to the south of Block D; among them is Letpando Oil Field, which lies right next to it. Further, many hand-dug wells and oil seeps exist in the area, which suggests the presence of a favorable oil and gas movement zone worthy of exploration. In order to study the next exploration efforts in the region, this paper examines closely the structural and sedimentary evolution of the area, with an emphasis on the characteristics of the oil- generated strata, sedimentary facies of reservoirs and cap rock, as well as the review of favorable oil and gas accumulation sites in the area. Middle-Late cretaceous Kabaw Formation and Early Eocene Laungshe Formation are the main oil-generating rock formations; good reservoirs are sandstones which include Miocene Letkat Formation, Eocene Pondaung Formation and Tilin Formation. Main caprock is developed from Miocene Natma Formation, Eocene Yaw Formation and Tabyin Formation. Late Miocene to Early Pliocene formed from various local structural traps makes them potential oil and gas accumulation sites. The paper concludes that the region presents Rood oil and gas potential.