摘要
西湖凹陷受区域构造应力场作用,经历了断陷、坳陷和区域沉降三个演化阶段。保俶斜坡是西湖凹陷的一个二级构造单元,在区域构造作用背景下,不同的演化阶段发育了不同规模、不同性质以NE^NEE向和NW向为主的两组断裂。这些断裂平面上具有明显的方向性、南北分段性;垂向上具有分层性。断层成为油气运移的通道,使油气沿断层作垂向运移或横穿断层作侧向运移,也成为阻止油气运移的屏障。保俶斜坡内局部构造类型主要与断裂有关,断裂构造的性质决定了圈闭类型;断裂作用的阶段性控制着油气藏的垂向叠置关系,断裂作用的构造迁移控制着油气藏的平面分布。斜坡内已发现了平湖、宝云亭、武云亭油气田和孔雀亭含油气构造。
Effected by regional tectonic stress field, Xihu Sag has undergone rifting, sinking and regional subsidence phases. Baochu slope is a sub-structure union, it developed two group of faults different size and different kind according to the different evolvement time, giving priority to the NE- NEE and NW direction. Being observed from the top, all the faults had clear orientation and subsection of SN, and had clear beds in the vertical. The faults were the channels of oil ＆ gas in the vertical and lateral direction, but also may be the barrier of movement of oil ＆ gas. The faults also had effected the local structures in Baochu slope, including the types of traps and their forming phases controlled the vertical superposed mode of oil ＆ gas. The tectonic transport controlled the lateral distribution of oil ＆ gas. Now there were four petroliferous structures such as Pinghu, Baoyunting, Wuyunting and Kunqueting.
出处
《海洋石油》
CAS
2007年第1期19-24,75,共7页
Offshore Oil
关键词
保俶斜坡
断裂特征
油气成藏
Baochu slope
the characters of ruptures
oil accumulation
