安岳气田震旦系、寒武系气藏成藏条件及勘探开发关键技术
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摘要
四川盆地震旦系—下古生界的勘探可追溯至20世纪50年代中期,其勘探过程曲折,对勘探经验进行总结可以为四川盆地深层碳酸盐岩油气勘探提供借鉴。安岳特大型气田成藏主要受德阳—安岳台内裂陷和川中古隆起共同控制;台内裂陷控制规模生烃中心和高效成藏组合,安岳特大型气田具有近源成藏的特征;台内裂陷边缘带、古隆起高部位控制储层发育,有利相带大面积分布,叠加古岩溶作用改造,储层规模分布;台内裂陷、古隆起联合控制规模圈闭的形成和油气富集。气田主力层系龙王庙组、灯影组四段、灯影组二段气藏特征和成藏主控因素有显著差异。龙王庙组气藏属构造背景下的岩性气藏,继承性发育的古隆起是储层形成、油气聚集成藏的关键。灯影组四段气藏主要受大型构造-地层复合圈闭控制,灯影组二段气藏为构造圈闭气藏。灯影组大气田分布受台内裂陷和古侵蚀面控制下的烃储近源匹配和上倾方向的地层封堵控制。针对安岳气田勘探开发形成了储层地震精细描述技术、气层测井精细评价技术、复杂地层快速钻井技术、高温高压气层改造技术等配套技术系列。技术的进步为特大型气田高效勘探、开发提供了有力的技术保障。
Exploration of the Sinian-Lower Paleozoic formations in the Sichuan Basin starts from the 1950 s,and is tortuous and complex.To summarize the exploration experiences is of great significance of reference for exploration of oil and gas in deep carbonate rocks of the Sichuan Basin.Gas accumulation in the Anyue oversize gas field is chiefly controlled by the Deyang-Anyue intra-platform rift and central Sichuan paleouplift.The intra-platform rift controls the scale hydrocarbon generation center and effective hydrocarbon plays.The Anyue gas field is characterized by near-source hydrocarbon accumulation.The marginal zone of intra-platform rift and high part of the paleouplift control the scale distribution of favorable facies belts of reservoir development,and overlapped by paleokarstic reformation,the reservoirs are widely distributed.The intra-platform rift and paleouplift jointly control formation of the scale traps and hydrocarbon enrichment.Gas reservoir features and major controlling factors for hydrocarbon accumulation have some differences in the main play strata,such as Longwangmiao Formation,and Member 4 and Member 2 of Dengying Formation.The gas reservoir in the Longwangmiao Formation is a lithologic gas reservoir under the tectonic setting,and the inherited paleouplift is a key for reservoir formation and hydrocarbon accumulation.The gas reservoir in the Member 4 of Dengying Formation is mainly controlled by large structural-stratigraphic composite traps,and the gas reservoir in the Member 2 of Dengying Formation is the structural trap.Distribution of the large gas fields in the Dengying Formation is controlled by the intra-platform rift,near-source hydrocarbon-reservoir configuration controlled by the ancient erosion surface and stratigraphic sealing in the updip direction.For exploration and development of the Anyue gas field,four series of technologies are developed,namely,reservoir seismic fine description technology,well logging fine evaluation technology of gas layers,fast drilling technology of complex strata,and stimulation technology for high temperature and high pressure gas layers.Technical progresses provide powerful guarantee for efficient exploration and development of the oversize gas fields.
Exploration of the Sinian-Lower Paleozoic formations in the Sichuan Basin starts from the 1950 s,and is tortuous and complex.To summarize the exploration experiences is of great significance of reference for exploration of oil and gas in deep carbonate rocks of the Sichuan Basin.Gas accumulation in the Anyue oversize gas field is chiefly controlled by the Deyang-Anyue intra-platform rift and central Sichuan paleouplift.The intra-platform rift controls the scale hydrocarbon generation center and effective hydrocarbon plays.The Anyue gas field is characterized by near-source hydrocarbon accumulation.The marginal zone of intra-platform rift and high part of the paleouplift control the scale distribution of favorable facies belts of reservoir development,and overlapped by paleokarstic reformation,the reservoirs are widely distributed.The intra-platform rift and paleouplift jointly control formation of the scale traps and hydrocarbon enrichment.Gas reservoir features and major controlling factors for hydrocarbon accumulation have some differences in the main play strata,such as Longwangmiao Formation,and Member 4 and Member 2 of Dengying Formation.The gas reservoir in the Longwangmiao Formation is a lithologic gas reservoir under the tectonic setting,and the inherited paleouplift is a key for reservoir formation and hydrocarbon accumulation.The gas reservoir in the Member 4 of Dengying Formation is mainly controlled by large structural-stratigraphic composite traps,and the gas reservoir in the Member 2 of Dengying Formation is the structural trap.Distribution of the large gas fields in the Dengying Formation is controlled by the intra-platform rift,near-source hydrocarbon-reservoir configuration controlled by the ancient erosion surface and stratigraphic sealing in the updip direction.For exploration and development of the Anyue gas field,four series of technologies are developed,namely,reservoir seismic fine description technology,well logging fine evaluation technology of gas layers,fast drilling technology of complex strata,and stimulation technology for high temperature and high pressure gas layers.Technical progresses provide powerful guarantee for efficient exploration and development of the oversize gas fields.
引文
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