四川盆地多层系油气成藏特征与富集规律

发布时间：2018-03-18 04:22

本文选题：四川盆地　切入点：沉积特征　出处：《天然气工业》2016年11期 　论文类型：期刊论文

【摘要】：四川盆地是新中国最早开展天然气勘探开发和综合利用的地区,经过半个多世纪的油气勘探,共在24个地层层位中发现了油气藏且以气为主。为了预测该盆地各层系下一步天然气勘探的方向和目标,系统总结了该盆地海相、陆相地层的沉积特征,分析了多旋回构造运动不同的表现形式和对沉积、成岩及成藏的控制作用。结果表明:①自震旦纪以来,该盆地经历了从海相沉积向陆相沉积的转变,以海相沉积为主:②多韵律沉积形成多套生—储组合,纵向上具有多层系油气成藏的特征;③多旋回构造运动具有多种表现形式,对沉积、成岩及成藏具有明显的控制作用。进一步分析了油气成藏特征及气藏富集规律,结论认为:①该盆地具有常规与非常规油气藏共存、多层系供烃、多种储层类型、多种圈闭类型、多期成藏、多种成藏模式等特征;②其天然气的富集与烃源强度、大型古隆起、有利沉积相带、沉积—构造间断面、构造裂缝发育带等因素有关。最后,结合油气地质基本条件、富集规律与勘探现状,预测了该盆地各层系下一步的天然气勘探和研究方向。
[Abstract]:The Sichuan Basin is the first area in New China to develop natural gas exploration and comprehensive utilization. After more than half a century of oil and gas exploration, In order to predict the direction and target of the next natural gas exploration in the basin, the sedimentary characteristics of marine and continental strata in the basin are systematically summarized. The different forms of polycyclic tectonic movement and its control on sedimentation, diagenesis and accumulation are analyzed. The results show that the basin has undergone a transition from marine to continental facies since the Sinian. The multi-rhythmic deposition of marine facies mainly consists of two types of assemblages, which are characterized by multi-layer oil and gas accumulation in the longitudinal direction, and the polycyclic tectonic movement is characterized by various forms of tectonics, which are related to the deposition of the oil and gas reservoirs. The diagenesis and reservoir formation have obvious controlling effect. The characteristics of oil and gas accumulation and the law of gas reservoir enrichment are further analyzed. It is concluded that the basin is characterized by coexistence of conventional and unconventional reservoirs, multilayer hydrocarbon supply, multiple reservoir types, and multiple trap types. The accumulation of natural gas is related to the strength of hydrocarbon source, large paleouplift, favorable sedimentary facies zone, sedimentation-structure discontinuity surface, structural fracture development zone and so on. Finally, the basic conditions of oil and gas geology are combined. The law of enrichment and the present situation of exploration are used to predict the future exploration and research direction of natural gas in each layer of the basin.
【作者单位】：中国石油西南油气田公司勘探开发研究院;
【基金】：国家大型油气田及煤层气开发重大专项“四川盆地及邻区下古生界—前寒武系成藏条件研究与区带目标评价”(编号:2016ZX05004-005)
【分类号】：P618.13

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