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塔里木盆地具有构造演化旋回多、烃源岩发育层系多、油气成藏期次多、油气藏破坏次数多等特点,油源普遍混淆,已发现油气藏以它源油气成藏体系为主,难以通过单油源含油气系统来解决油气成藏的认识问题。论文以塔中低凸起石炭系油气藏为研究对象,引入“网毯式油气成藏体系”理论,剖析了油气成藏体系结构及特征,揭示了油气输导体系。结果表明:塔中低凸起石炭系发育CⅢ、CⅠ两套次级成藏体系单元,各成藏体系单元结构包括油源通道网层、仓储层、油气聚集网层等三层结构;油气输导体系划分为四类十一型,即断裂输导型、不整合输导型、连通砂体输导型及火山岩输导型,输导模式包括“Y”型、“T”型及“S”型等。塔中低凸起为典型的复合网毯式油气成藏体系,成藏体系结构和输导体系的建立为石炭系油气藏滚动开发拓展了新的思路。
The Tarim Basin is characterized by multiple cycles of tectonic evolution, multiple developmental layers of hydrocarbon source rocks, multiple hydrocarbon accumulation periods, and many times of oil and gas reservoir destruction. The oil source is generally confused. It has been found that the oil and gas reservoirs are dominated by its source hydrocarbon accumulation system, It is difficult to solve the problem of hydrocarbon accumulation by oil-gas system with single oil source. In this paper, the Carboniferous reservoirs with low uplifts in the Tarim Basin are taken as the research object. By introducing the theory of “blanket oil and gas accumulation system”, the structure and characteristics of hydrocarbon accumulation system are analyzed, and the oil and gas transport system is revealed. The results show that there are two sets of CⅢ and CⅠ subelements in the Carboniferous of lowstands in Tazhong, and the unit structures of each reservoir system include three layers of oil source channel network layer, reservoir layer and hydrocarbon accumulation network layer. The conductor system is divided into four types of eleven, that is, the fault conductivity type, the unconformity conductivity type, the connected sand body conductivity type and the volcanic rock conductivity type. The conduction modes include “Y” type, “T” Type and “S ” type and so on. The low and middle convexity of the tower is a typical complex-type bedrock-type oil and gas accumulation system. The establishment of reservoir-forming system structure and transport system has expanded the new thinking for the rolling development of Carboniferous reservoirs.