准噶尔盆地南缘中段异常压力分布及影响因素  

Overpressure Distribution and Affecting Factors in Southern Margin of Junggar Basin

作　　者：罗晓容[1] 肖立新[2] 李学义[2] 张立强[1] 曾治平[1] 王兆明[1] 

机构地区：[1]中国科学院地质与地球物理研究所,北京100029 [2]新疆石油管理局勘探开发研究院地球物理研究所,新疆乌鲁木齐830011

出　　处：《地球科学（中国地质大学学报）》2004年第4期404-412,共9页Earth Science-Journal of China University of Geosciences

基　　金：国家重点基础研究发展规划项目 (G19990 43 3 10 ) ;国家自然科学基金项目 (No .40 0 72 0 45 )

摘　　要：准噶尔盆地南缘地区盆地演化时间长 ,近期构造活动剧烈 ,构造应力场复杂 ,地层异常压力高且分布极不规律 ,对构造的形成演化及对油气的成藏过程影响极大 .据实测资料和间接估算数据所展示的地层压力分布特征 ,分析了砂砾岩地层和泥岩地层在压力成因和分布等方面的差异 ,从不同渗透性地层内压力形成的机制和分布特征的角度讨论了控制和影响现今压力分布的地质因素 .准噶尔盆地南缘存在的极高地层压力是在压实作用、构造挤压作用所形成的地层高压背景下 ,叠加了近期因断裂活动和背斜构造快速形成所引起的他源高压而形成的 .沉积相带分布、压实作用、构造应力。As a part of Junggar basin, the southern margin region has received the sediments from Permian to Quaternary period. The tectonic activities, occurring intensively in the area during recent million years, cause strange tectonic stress in SN direction and result in a series of anticlines accompanied with different scales of faults. Very high overpressures, the largest one with the pressure coefficient of 2.4, are observed in the area. Pressures measured with DST/RFT methods and those estimated from acoustic logging data are used in this paper to characterize overpressure distribution in the basin. Pressuring effect of different geological factors in permeable sandy and sealing shaly formations are discussed. It indicated that the occurrence and distribution of overpressures in the southern margin have been seriously influenced by many geological factors, such as deposition facies, the tectonic stress action, deformation of sediments, as well as fractures occurrences and so on. Synthetically, the extremely high pressures encountered in the research area result from the effect of compaction caused by both the gravity and the tectonic stress, in combination with faulting that makes hydraulic connection among permeable formations, and with folding that makes the permeable formations incline.

关 键 词：准噶尔盆地南缘 构造活动 地层压力 地质因素 增压机制 

分 类 号：P618.130[天文地球—矿床学]