川东北元坝地区隐蔽气藏的勘探突破及其意义

隐蔽油气藏识别难度大,其勘探面临很大的挑战,但通过转变油气勘探思路,中国石化勘探南方分公司在四川盆地东北部元坝地区深层二叠系、三叠系礁滩相隐蔽油气藏勘探中获得了突破,分析其成功经验对于四川盆地隐蔽性油气藏的勘探工作具有指导意义。为此,归纳总结了发现元坝隐蔽圈闭采用的技术手段:①应用层序地层学理论指导沉积相研究;②应用地震沉积学原理指导沉积微相解释;③通过地震相转换为沉积相的地震沉积学解释,为储层预测奠定基础等。同时,分析了该区深层碳酸盐岩礁滩相岩性圈闭具备的成藏有利条件:烃源条件好,具有良好的侧向遮挡条件,油气配置关系良好,油气运聚保存条件好。最后,阐述了该区隐蔽气藏取得勘探突破的重要意义。

An exploration breakthrough of subtle gas reservoirs in the Yuanba area of the northern Sichuan Basin and its significance

A breakthrough has been made by the Sinopec South Exploration Company in the exploration of subtle oil and gas reservoirs in the deep Permian and Triassic of reef bank facies. An analysis of this successful experience is of great significance for guiding the exploration of similar reservoirs in the Sichuan Basin. The following three measures have contributed to the discovery of the Yuanba subtle trap.①The theory of sequence stratigraphy is used to guide the research of sedimentary facies; ②The theory of seismic sedimentology is used to guide the interpretation of sedimentary micro facies; ③The conversion of seismic facies into sedimentary facies provides a robust basis for reservoir prediction. The hydrocarbon pooling characteristics of the lithologic traps of deep carbonates of reef bank facies are studied, including good source rock conditions with favorable lateral barriers, good oil and gas combinations, as well as good migration and preservation conditions. The great significance of the exploration breakthrough of subtle gas reservoirs is also analyzed.