摘要
由于区域走滑构造应力场作用,近SW—NE向延伸的辽西1号断层和辽中1号断层长期活动,辽东湾海域发育了极其复杂的断裂系统,形成了众多断块圈闭。辽东湾海域近年勘探评价的含油构造均为复杂断块构造,钻井证实构造内各断块油水系统及储量差异巨大,影响断块油气成藏差异的主要原因是断层侧向封堵性。统计表明,有45.8%钻探失利或不理想钻井是由于断层侧向封堵性不好所致。结合前人研究成果,文中采用岩性并置和泥岩涂抹系数方法,系统分析了金县1-1E油田和锦州25-1油田主要断块的断层侧向封堵性,发现了多个油气富集块。研究表明:断层侧向封堵性差,油气少量成藏或者不成藏;断层侧向封堵性好,油气大规模成藏。断层侧向封堵分析技术在辽东湾海域的成功应用,为复杂断块油田勘探评价提供了一种可行的技术手段。
Liaoxi No.1 fault and Liaozhong No.1 fault have activated with a long time, which extended along near SW-NE trending, under the action of regional strike-slip tectonic stress field. As a resuh, complex fault systems and a lot of fault-block traps were formed in Liaodong Bay. In recent years, the oil-bearing structures which were explored and evaluated in Liaodong Bay were all the complex fault-block structures. It was found that the oil-water systems and reserves showed great difference by drilling in these fault-blocks. The hydrocarbon accumulation was mainly influenced by the lateral sealing of fault. Statistics show that the 45.8% failure or non-ideal drilling was due to the poor lateral sealing of fault. Based on the previous researches, this paper systemically analyzed the fault lateral sealing of main fault-blocks of Jinxianl-lE and Jinzhou25-10ilfields through using the methods of lithology juxtaposition and clay smear. Then, several blocks were found in these oilfields, which accumulated huge hydrocarbon. This study shows that the lateral sealing of fault is poor, the hydrocarbon accumulation is a little or none. Otherwise, the hydrocarbon accumulation was in a large scale when the hydrocarbon accumulation was good. The analytical technique of lateral sealing of fault has been successfully applied in Liaodong Bay, which provides a feasible way for the exploration and evaluation of complex fault-block oilfiled.
出处
《断块油气田》
CAS
北大核心
2011年第6期740-742,共3页
Fault-Block Oil & Gas Field
基金
国家科技重大专项“近海隐蔽油气藏勘探技术”(2008ZX05023-002)
关键词
复杂断块
断层侧向封堵
岩性并置
泥岩涂抹
辽东湾
complex fault-block
lateral sealing of fault
lithology juxtaposition
clay smear, Liaodong Bay
