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沾化凹陷异常高压分布特征及其成因机制探讨
引用本文:魏海泉,徐东锋,赵红佳,刘见宝,夏斌.沾化凹陷异常高压分布特征及其成因机制探讨[J].世界科技研究与发展,2011,33(2):291-293.
作者姓名:魏海泉  徐东锋  赵红佳  刘见宝  夏斌
作者单位:1. 中国科学院广州地球化学研究所,广州,510640;中国科学院研究生院,北京,100049;中石化胜利油田分公司,东营,257000
2. 大庆油田装备制造研究院,大庆,163311
3. 中国科学院广州地球化学研究所,广州,510640;中国科学院研究生院,北京,100049
4. 中国科学院广州地球化学研究所,广州,510640;中山大学海洋学院,广州510006
摘    要:采用声波时差法计算沾化凹陷沙三、沙四段的地层压力。发现异常高压纵向上存在两个独立的异常高压系统,规模较大、持续活动强的断层往往是异常高压区的边界,并起到泄压的作用。平面上,以洼陷为中心形成异常高压区,向外逐渐过渡为正常压力带。从沙三上段至沙三四上段,异常高压范围经历了一个扩张-萎缩的旋回,沙三下段凹陷内异常高压分布面积达到最大。对沾化凹陷新生代沉降史及生排烃史的研究表明,较高的沉积速率及有机质生烃是沾化凹陷异常高压发育的主要因素。构造作用通过断层泄压、控制沉积速率及有机质展布起到对异常高压分布直接或间接的控制作用。

关 键 词:异常高压  形成机制  欠压实  有机生烃

Abnormal High Pressure Distribution of Zhanhua Depression and Discussion of Its Formation Mechanism
WEI Haiquan,XU Dongfeng,ZHAO Hongjia,LIU Jianbao,XIA Bin.Abnormal High Pressure Distribution of Zhanhua Depression and Discussion of Its Formation Mechanism[J].World Sci-tech R & D,2011,33(2):291-293.
Authors:WEI Haiquan  XU Dongfeng  ZHAO Hongjia  LIU Jianbao  XIA Bin
Institution:1. Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640 ; 2. Graduate University of China Academy of Sciences, Beijing 100049; 3. Shengli Oilfield Branch Corporation, China Petroleum & Chemical Corp. , Dongying 257000 ; 4. Institute of Equipment Manufacturing, Daqing Oilfield Branch Corporation, China National Petroleum Corp. , Daqing 163311 ; 5. Maritime Academy of Sun Yat-Sen University, Guangzhou 510006 )
Abstract:Interval transit time is applied to calculate the formation pressure of sha-3 and sha-4 member in Zhanhua depression. There are two vertical separate abnormal high pressure systems. Large-scale sustained activity faults are always boundaries of abnormal high pressure zone, and play the role of pressure relief. Abnormal high pressure zone is formed in the center of sag. normal pressure is outside the center. From sha-3 upper member to sha-4 upper member, abnormal high pressure has gone through a range of expansion-contraction cycles. And in sha-3 lower member the abnormal pressure reaches the maximum. Cenozoic sedimentation history and hydrocarbon generation history of Zhanhua depression show that a higher deposition rate and organic hydrocarbon generation are major factors of the abnormal pressure development in Zhanhua depression. The formation pressure distribution is controlled directly or indirectly by the tectonism through faults relief pressure, sedimentation rate and organic matter distribution.
Keywords:abnormal high pressure  formation mechanism  uncompacted  organic hydrocarbon generation
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