作　　者： ; ; ; ; ;

机构地区： 中国科学院广州地球化学研究所

出　　处： 《大地构造与成矿学》 2012年第1期39-43,共5页

摘　　要： 通过研究区剩余压力的纵向和平面展布特征分析,认为车西地区深层普遍存在超压现象,纵向上超压一般出现在2000多米深处,往下开始时剩余压力与深度呈线性关系,随着深度增大,剩余压力值波动较大;在平面分布上,剩余压力等值线呈北东向延伸,与埕南断裂走向基本相同,超压的空间分布与生油洼陷基本一致。结合区域沉积-构造演化对超压的成因进行了分析,认为车西地区超压的形成与区域构造演化中强烈断陷阶段(T6-T2)关系最密切,进入强烈断陷阶段后,车西地区快速沉降,引起地层不均衡压实和有机质生烃作用,是深层超压形成的主要因素。 Chexi area is located in northeastern Jiyang depression of Bohai Bay Basin. Based on the analysis of vertical and horizontal distribution of the residual stresses, the authors suggest that overpressure widely exists in deep strata of the Chexi area, and the overpressure appears usually at the depth of 2000 m. In vertical direction, the residual overpressure increases with increase of depth; horizontally, the contour of residual stress is NE-trending similar to that of the Chengnan Fault, and the spatial distribution of overpressure is basically consistent with the oil sub-sag. Combining with the analysis of regional tectonic, the authors discussed the formation mechanism of overpressure, and proposed that the formation of overpressure is closely related to the sedimentary and tectonic evolution of the strong rifting stage （T6-T2）. The rapid subsidence of the depression caused the imbalance compaction of strata and organic matter in the study area since it evolved into the strong rifting stage, which contributes to the complexity of the deep strata in the Chexi area.

关 键 词： 车西地区 超压 展布特征 成因机制 济阳坳陷

领　　域： [石油与天然气工程]