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塔南凹陷铜钵庙组不同构造区带之间的油气分布具有严重的不均一性。通过精细油藏描述,系统总结出塔南凹陷铜钵庙组油气分布特征,并对其主控因素进行了分析。结果表明,西部、中部断裂潜山带和中部次凹构造转换带以断块、断背斜和断鼻油藏为主,是油气富集高产的主力区带;中部次凹南、北洼槽以断层-岩性、岩性和地层不整合遮挡油藏为主,储量丰度和油井产能均较低。区带间差异的构造沉积格局控制研究区多种类型油藏的形成与分布;沉积相和成岩相造成的储集相带的差异决定了储层质量,进而控制油气富集程度和油井产能;区带间差异输导体系决定了油气运聚规律,并控制形成3种油气分布模式,即源外不整合输导断控富集模式、源内复合输导相控贫化模式和源边断裂输导断控富集模式。
The distribution of oil and gas between different tectonic zones of Tongbomiao Formation in Tanan Depression is seriously inhomogeneous. Through the detailed reservoir description, the oil and gas distribution characteristics of Tongbomiao Formation in Tanan Depression are summarized and the main controlling factors are analyzed. The results show that the western and central fractured buried hill belts and the central subduction belts are dominated by fault blocks, anomalous faulted anticline and fault-broken reservoirs, which are the main belts for oil and gas enrichment and high yield. The central sub-depression southern and northern depression Fault-lithology, lithology and formation unconformity block oil reservoirs, with low reserves abundance and well productivity. The difference between the zones can control the formation and distribution of various types of reservoirs in the study area. The differences of reservoir facies caused by sedimentary facies and diagenetic facies determine the reservoir quality and thus the degree of hydrocarbon enrichment and oil well productivity. The interbassional differential transport system determines the hydrocarbon migration and accumulation rules and controls the formation of three types of hydrocarbon distribution patterns, that is, unconformity source-outage integrated pilot-controlled enrichment mode, source-controlled composite phase-controlled lean mode and source-side fault transport Guide control enrichment mode.