牛庄洼陷沙河街组超压系统发育特征及其演化  

Development characteristics of overpressure system of the Shahejie Formation and its evolution in the Niuzhuang Sag,Bohai Bay Basin

作　　者：李阳[1] 王建伟[2] 赵密福[3] 高侠[4] 

机构地区：[1]中国石油化工股份有限公司油田事业部,北京100029 [2]中国石油化工集团公司胜利油田分公司现河采油厂地质所,山东东营257068 [3]中国石油化工集团公司胜利油田分公司东辛采油厂,山东东营257068 [4]中国石油化工集团公司胜利油田分公司物探研究院,山东东营257022

出　　处：《地质科学》2008年第4期712-726,共15页Chinese Journal of Geology(Scientia Geologica Sinica)

基　　金：中国石油化工集团公司"十五"科技攻关项目(P01035)"复杂断块油田提高采收率技术研究"的部分成果

摘　　要：东营凹陷牛庄洼陷沙河街组发育有超压系统,这对油气运移和聚集过程有着重要的影响。在对超压系统现今发育特征研究的基础上,本文运用约束下数值模拟方法对牛庄洼陷超压系统的演化规律进行研究,并探讨了超压系统的主要形成机制。牛庄洼陷在沙河街组四段、沙河街组三段的下亚段和中亚段存在着超压系统,最大压力系数可以达到1.8,最大剩余压力超过了20MPa。自沙三段上亚段沉积期开始,超压系统开始发育。到东营组沉积期末,超压系统经历了大约10Ma的泄压过程。自新近系馆陶组沉积期,超压系统再次迅速增压,逐渐接近现今发育状况。上覆地层沙三段上亚段高沉积速率导致了超压系统的形成和早期剩余压力的增加,而水热增压和烃类物质大量生成联合造成超压系统晚期迅速增压。超压系统演化规律揭示出在油气主要运移期研究区古异常流体压力的分布状况,这为进一步开展牛庄洼陷油气运移和聚集过程的动力学研究提供了理论依据。There is an overpressure system in the Paleogene Shahejie Formation in the Niuzhang Sag, Jiyang Depression of Bohai Bay Basin, and the overpressure system makes a strong impact on petroleum migration and accumulation. Based on detailed description of present development characteristics of overpressure system, numerical simulation was applied to analyze evolution of overpressure system, and the generation mechanism of overpressure system was discussed. Overpressure system distributed in the Mid and Lower Sub-Members of 3^rd Member and 4^th Member, Shahejie Formation in the sag. The maximum pressure coefficient exceeded to 1.8, and excessive pressure exceeded to 20 MPa. The overpressure system began to develope since the deposition period of the 3^rd Member of Shahejie Foemation. After sedimentary period of the Dongying Formation, the area experienced an erosional period for about 10 Ma. Since Neogene （the sedimentary period of the Guantao Formation） , fluid pressure of overpressure system increased once more, and overpressure system gradually got the present development characteristics. High deposition rate of overlying formation made development of overpressure system at early stage. In Neogene period, both aquathermal pressuring and hydrocarbon generation resulted in dramatically rising of fluid pressure of overpressure system. The evolution of overpressure revealed the distribution of abnormal fluid pressure in petroleum migration period, which provided a theoretical evidence for the paleo-dynamics of petroleum migration and accumulation in the Niuzhuang Sag.

关 键 词：超压系统 两段式发育 超压成因 沙河街组 牛庄洼陷 

分 类 号：TE122[石油与天然气工程—油气勘探]