摘要
塔里木盆地中生界具有厚度大、分布广及保存良好等特点。烃源岩以暗色泥质岩及煤系为主,夹有碳酸盐岩及油页岩,累计厚700—1200m,分布面积约38×10km。有机质干酪根类型以Ⅱ-Ⅲ型为主,部分为Ⅱ-Ⅰ型;R值0.6%—1.2%;具有良好的生烃潜力。广泛发育河流、三角洲及湖泊相砂体,储集条件良好,各种披覆构造、挤压背斜及地层、岩性圈闭也十分发育。近年来在中生界已连续获得重大油气突破,丰硕的油气勘探成果表明中生界具有广阔的油气前景。
Abstract
Tarim Basin,covering a range of 56×10 km,is a Meso-Cenozoic inland basin of composite-superposed type formed on a stable landmass.The Meso-Cenozoic sediments are mainly coal-bearing clastic rocks that are distributed within an area of 38×10 km with the thickness of 1600m-5000m.Triassic-Jurassic source rocks are dark argillaceous rocksand coal measures intercalated with gray carbonate rocks and oil shales of 700-1200mthick.Organic matter is primarily Ⅰ-Ⅲ type and partly Ⅰ-Ⅱ type,vitrinite re-flectance is generally 0.6%—1.2%,suggesting good hydrocarbon generating potential.As for hydrocarbon preservation condition,sandbodies of fluvial,deltiac and lacustrine facies are well developed in Mesozoic,which might form favourable preservation sedimen-tary facies in time and space;many drape structures,compression anticlines,lithologic and stratigraphic traps developed there,which prepared fine conditions for the formation of hydrocarbon pools.Thus the Mesozoic stratum in Tarim Basin has shown bright prospects in hydrocarbon exploration.This has been proved by the discovery of a number of high-productive wells such as Sha-5(K),Sha-4(J)and Lunnan-2(T)wells.
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