沙南凹陷构造演化的“跷跷板”效应与油气评价新认识
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摘要
在地震资料区域解释和编图的基础上,结合各类钻井资料,对渤海海域沙南凹陷从凹陷结构、地层展布和构造演化等方面进行了分析,进而评价了沙南西洼烃源岩的质量、规模和资源潜力。沙南凹陷沙三段地层西厚东薄,而东营组地层西薄东厚,表现出沙南凹陷早期西洼埋藏深、后期东洼埋藏深的"跷跷板"迁移过程;受沙三段沉积时期西倾古地貌的影响,沙南西洼发育沙三中亚段中深湖相—深湖相优质烃源岩,其分布范围广、厚度大、有机质丰度高;沙南西洼总生烃量可达44亿t,油气资源潜力较大,展示出良好的油气勘探前景。
By a regional interpretation and mapping of seismic data and in combination with various drilling data,Shanan sag in Bohai sea was analyzed in several aspects such as configuration,stratigraphy and structural evolution,and then the quality,size and resources potential of its source rocks were evaluated.In this sag,Member 3 of Shahejie Formation is thicker in the west and thinner in the east,and Dongying Formation is thicker in the east and thinner in the west,indicating a transfer process of "Seesaw" style from early west sagging and deep-burial to late east sagging and deep-burial.In the west depocenter of the sag,a set of excellent source rocks in subdeep-deep lacustrine facies has developed in the middle sub-member of Member 3,Shahejie Formation,due to a west-dipping paleogeomorphology during deposition of this Member 3,and it is wide in distribution,great in thickness and rich in organic abundance.There is a greater potential of hydrocarbon resources in the west depocenter,with the total hydrocarbon generation up to 4.4 billion tons,showing a quite good perspective in hydrocarbon exploration.
By a regional interpretation and mapping of seismic data and in combination with various drilling data,Shanan sag in Bohai sea was analyzed in several aspects such as configuration,stratigraphy and structural evolution,and then the quality,size and resources potential of its source rocks were evaluated.In this sag,Member 3 of Shahejie Formation is thicker in the west and thinner in the east,and Dongying Formation is thicker in the east and thinner in the west,indicating a transfer process of "Seesaw" style from early west sagging and deep-burial to late east sagging and deep-burial.In the west depocenter of the sag,a set of excellent source rocks in subdeep-deep lacustrine facies has developed in the middle sub-member of Member 3,Shahejie Formation,due to a west-dipping paleogeomorphology during deposition of this Member 3,and it is wide in distribution,great in thickness and rich in organic abundance.There is a greater potential of hydrocarbon resources in the west depocenter,with the total hydrocarbon generation up to 4.4 billion tons,showing a quite good perspective in hydrocarbon exploration.
引文
[1]邓运华,李建平.浅层油气藏的形成机理——以渤海油区为例[M].北京:石油工业出版社,2008.
[2]刘传联,徐金鲤,汪品先.藻类勃发——湖相油源岩形成的一种重要机制[J].地质论评,2001,47(2):207-209.
[3]王庆寿,何祖荣.深化泌阳凹陷认识开拓油气勘探领域[J].河南石油,2002,16(1):1-6.
[2]刘传联,徐金鲤,汪品先.藻类勃发——湖相油源岩形成的一种重要机制[J].地质论评,2001,47(2):207-209.
[3]王庆寿,何祖荣.深化泌阳凹陷认识开拓油气勘探领域[J].河南石油,2002,16(1):1-6.
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