断层幕式活动对平浅湖盆可容空间的控制作用——以车镇凹陷古近系沙二段为例

Control effect of fault episodic activities on accommodation space in flat lake basin: taking second Member of Shahejie Formation of Chezhen Depression for example

韩敏

HAN Min

中国石化胜利油田分公司勘探开发研究院，山东 东营 257000

Research Institute of Exploration and Development, Shengli Oilfield Company, SINOPEC, Dongying 257000, China

断层幕式活动是控制湖盆可容空间再分配的主要因素。断层的活动会造成湖盆基底的差异性沉降，从而引起水下可容空间的再分配。可容空间的变化控制了沉积砂体的分布以及沉积层序的发育。车镇凹陷古近系沙二段具有平盆浅水的沉积特点，断层活动对沉积作用的影响变得更加明显。由于盆内断层多次幕式活动控制了沙二段沉积层序的发育，总体可划分为3个沉积旋回：近北西向断层活动控制了沙二下沉积时期的地层单元形成和分布；南斜坡近北东向断层活动控制了沙二中沉积时期的地层单元形成和分布；沙二上亚段盆地的整体沉降控制了沉积充填序列。

Fault episodic activities are the main factor of controlling redistribution of accommodation space in lake basin. The differential subsidence of basement resulted from the episodic movement of faults can lead to redistribution of accommodation space. The accommodation space changes control sedimentary sandstone distribution and sequence development. The sedimentary period of the second Member of the Shahejie Formation in Chezhen Depression has the characteristics of flat basin and shallow water. Fault activities influence on sedimentation becomes even more obvious. Since the fault episodic activities controlled the depositional sequence development of Es2, the Es2 strata of study area is divided into 3 sedimentary sequences. The nearly north-west faults activities controlled the stratigraphic unit formation and distribution of lower Es2 Member. The nearly north-east faults activities in the southern slope controlled the stratigraphic unit formation and distribution of middle Es2 Member. Basement subsidence controlled the stratigraphic unit formation and distribution of upper Es■ Member.

10.6056/dkyqt201802007