石油与天然气地质 ›› 1997, Vol. 18 ›› Issue (4): 267-275.doi: 10.11743/ogg19970402

• 论文 • 上一篇    下一篇

鄂尔多斯古构造应力场与中部大气田的联系

吴冲龙, 周江羽, 王根发, 周辉, 张琼岩   

  1. 中国地质大学资源学院 湖北武汉 430074
  • 收稿日期:1997-03-14 修回日期:1997-05-08 出版日期:1997-12-25 发布日期:2012-01-18
  • 基金资助:

    国家"八五"重点科技攻关项目(85-102-01-03)的研究成果之一

RELATIONSHIP BETWEEN PALEO TECTONIC STRESS FIELDS AND MAJOR GAS FIELDS IN ORDOS BASIN

Wu Chonglong, Zhou Jiangyu, Wang Genfa, Zhou Hui, Zhang Qiongyan   

  1. Resources Institute, China University of Geosciences, Wuhan
  • Received:1997-03-14 Revised:1997-05-08 Online:1997-12-25 Published:2012-01-18

摘要:

各原型盆地的地层顶面高程趋势面剩余分析,与相应的沉积基底形态分析结果证实,鄂尔多斯盆地中部加里东期侵蚀面附近存在大型平缓隆起。将盆地基底的同沉积构造变形史分析和区域大地构造运动史分析结合起来,拟定了早、晚燕山期的盆地构造应力作用方式和方向;然后利用有限单元法分别模拟了盆地这两个演化阶段的古构造应力场和应变场特征,进而探讨它们与盆地中部大型平缓隆起及大气田的成因联系。可能是下古生界的泥岩和膏盐层在挤压应力场中的垂向膨胀,促成盆地中部的加里东期侵蚀面附近出现大型平缓构造圈闭;低挤压应力与其他因素的叠合,导致低压、负压环境的出现,使中部隆起区既成为天然气运移指向区也成为天然气藏封存箱。

关键词: 构造, 应力场, 应变场, 天然气, 运移, 聚集, 鄂尔多斯盆地

Abstract: Residual trend surface analysis on elevation of stratigraphic top surface of prototype basins and the analysis on the geometry of corresponding sedimentary basements indicate that a large flat uplift close to the Caledonian erosional surface exists in the central Ordos Basin.Combining the analysis of syndepositional tectonic deformation in the basements with that of regional tectonic history,ways and directions of the tectonic stress in early and late Yenshan stages are determined.Then the tectonic stress field and strain field of the two stages are simulated by using finite element method,and their genetic relationships to the above mentioned large flat uplift and big gas fields in the central Ordos Basin are studied.It is considered that vertical expansion of Early Paleozoic mudstone and gypsum salt rock layers in compressional stress field might promote the formation of large flat structure trap close to the Caledonian erosional surface where the gas fields are situated.The superimposition of low compressional stress and other factors resulted in negative pressure environment,the central part of the basin became the accumulation area and container for natural gas.