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车镇凹陷普遍存在异常高压,凹陷内不同次级洼陷压力结构存在较大的差异。利用钻井泥浆、测井和试油等资料,分析了车镇凹陷不同洼陷的地层压力结构特征。在单井垂向上,地层压力系统可划分为上部静水压力系统、中部异常高压系统和底部常压系统。在二维剖面上,根据压力的分布可划分为外环常压系统、中环异常高压系统和内环超压系统。结合点面体地层压力结构研究发现,在车镇凹陷套尔河洼陷沙四段上亚段—沙三段中下亚段形成独立的超压封存箱型压力结构体系,顶部由沙三段中下亚段的洪泛面形成封盖,侧向由岩性及岩性相变形成封隔。车镇凹陷地层压力结构主要受控于沉积环境、烃源岩分布范围以及构造断裂活动。在洼陷之间存在沟通深层超压断裂体系则容易形成低幅他源压力结构体系。
There are common abnormal pressure in Chezhen depression, and the pressure structures in different secondary sags in the depression are quite different. Using the data of drilling mud, logging and oil testing, the formation pressure characteristics of different sags in Chezhen depression are analyzed. In vertical well, the formation pressure system can be divided into the upper hydrostatic pressure system, the central abnormal pressure system and the bottom of the atmospheric pressure system. In the two-dimensional profile, according to the pressure distribution can be divided into the outer ring atmospheric pressure system, the central abnormal pressure system and the inner ring overpressure system. Based on the study of the pressure structure in the formation of point body, it was found that an independent overpressure seal box pressure structure was formed in the middle and lower sub-member of the upper Es4-Sha3 Member of the Shaerhe Sag of Chezhen Depression, The lower section of the flood surface to form a cover, laterally lithology and lithology by the formation of a phase change pack. The formation pressure structure in Chezhen depression is mainly controlled by depositional environment, source rock distribution and tectonic activity. The existence of communication between the subsurface deep overpressure fracture system is easy to form low-pressure source structure of his source.