东海陆架盆地台北坳陷烟囱构造特征  

Chimney structures in the shelf basin of East China Sea

作　　者：姜正龙[1] 张为民[2] 肖毓祥[2] 

机构地区：[1]中国矿业大学资源与安全工程学院 [2]中国石油勘探开发研究院,北京100083

出　　处：《石油学报》2006年第1期34-36,41,共4页Acta Petrolei Sinica

基　　金：国家重点基础发展规划"973"项目(2001C209103)资助

摘　　要：在异常高压发育、有流体活动及发生沸腾作用的地层内,易形成烟囱构造。东海陆架盆地台北坳陷超压一般出现在明月峰组下部地层,部分井的泥岩超压带开始发育于灵峰组。古新世和始新世地温梯度高,是大量生烃和热流体形成时期,也是烟囱构造的主要发育时期。根据其成因,将烟囱构造分为有机、无机和混合3种类型,有机成因和混合成因是台北坳陷烟囱构造主要发育类型。有机成因又分为泥底辟型和层间侧向疏导型;混合成因有热液底辟型和热液断涌型。烟囱构造的发育可以引起幕式排烃和改善储层物性,不仅有利于烃类的运移,也有助于油气的聚集成藏,压力过渡带和正常压力区的目的层是油气富集有利地区。Taibei Depression in the shelf basin of East China Sea has the geological conditions for generating chimney structures,such as very thick source rock,overpressure and abnormal temperature. Based on the source of thermal fluid and geometrical characteristics of chimney structures in Taibei Depression of the shelf basin of East China Sea,the chimney structures were divided into three types and six subtypes. The generation and distribution of the chimney structures and their relations with oil-gas migration and accumulation show that the chimney structures can result in the episodic hydrocarbon expulsion,improve the reservoir characteristics and benefit hydrocarbon migration and accumulation. The layers in the normal pressure zone or the transitional zone from overpressure to norreal pressure always are the best plays of gas and oil accumulation.

关 键 词：东海 陆架盆地 台北坳陷 烟囱构造 异常高压 泥底辟 油气聚集 

分 类 号：TE111.2[石油与天然气工程—油气勘探]