济阳坳陷超压结构差异性及其控制因素

发布时间：2018-05-03 04:30

本文选题：地层压力 + 超压系统　；参考：《石油与天然气地质》2017年03期

【摘要】：济阳坳陷作为我国东部渤海湾盆地内重要的富烃坳陷之一,内部具有复杂多样的压力环境。通过对济阳坳陷内各凹陷的实测地层压力统计、泥岩超压测井响应以及超压剖面发育特征的研究,将东营凹陷、车镇凹陷、沾化凹陷和惠民凹陷的超压系统划分为3种:单-强超压系统、复合超压系统与单-弱超压系统。单-强超压系统分布在东营凹陷与车镇凹陷,纵向上发育沙河街组三段-四段一个超压系统,超压幅度大,压力系数可达1.8以上。复合超压系统分布在沾化凹陷,纵向上发育沙一段、沙三段和沙四段3个超压带,且相互独立。单-弱超压系统分布在惠民凹陷,发育沙三段一个超压系统,超压的幅度相对较弱,压力系数不超过1.4。超压结构的差异性与烃源岩发育层系、热演化程度、压力封闭层分布以及断裂活动密切相关。烃源岩分布与演化控制了超压的形成和分布,压力封闭层控制着超压顶底界面,深大断裂控制了超压系统内外横向边界。
[Abstract]:Jiyang depression is one of the important hydrocarbon rich depression in the Bohai Bay basin in the east of China. Based on the statistics of actual formation pressure, the response of mudstone overpressure logging and the development characteristics of overpressure profile in various sag of Jiyang depression, Dongying sag and Chezhen sag are studied. The overpressure system of Zhanhua sag and Huimin sag can be divided into three types: single-strong overpressure system, composite overpressure system and single-weak overpressure system. The single-strong overpressure system is distributed in Dongying sag and Chechen sag. There is an overpressure system in the third and fourth member of Shahejie formation. The overpressure range is large and the pressure coefficient is over 1.8. The complex overpressure system is distributed in Zhanhua sag. There are three overpressure zones in the first member of Shahejie formation, the third member and the fourth member of Shahejie formation, which are independent of each other. The single-weak overpressure system is distributed in Huimin sag, and there is an overpressure system in the third member of Shahejie formation. The amplitude of overpressure is relatively weak, and the pressure coefficient is not more than 1.4. The difference of overpressure structure is closely related to the development of the source rock, the degree of thermal evolution, the distribution of the pressure seal layer and the fault activity. The distribution and evolution of source rocks control the formation and distribution of overpressure, the pressure seal layer controls the interface between the top and bottom of the overpressure, and the deep and large faults control the lateral boundary of the overpressure system inside and outside.
【作者单位】：中国石化胜利油田分公司勘探开发研究院;
【基金】：国家科技重大专项(2011ZX05006)
【分类号】：P618.13

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