Analysis of the Characters of the Paleotectonic Stress Field and Its Inversion Method
详细信息
- 责任者：Wang Lizhi (Research Institute of Petroleum Exploration and Development ; East China Branch Company ; SINOPEC ; Nanjing 210011 ; China) ; Jia Lilong
- 刊名：Coal Geology & Exploration
- 出版年：2013
- 卷期：41(5)
- 关键词：构造应力场 ; tectonic stress field ; 鄂尔多斯盆地 ; Ordos Basin
- 页码：p.17-23
- 图表：7 illus., 6 tables, 16 refs.
- 分类号：0300
- issnNo：ISSN1001-1986
- isbnNo：CN61-1155/P
摘要
Ancient tectonic stress controls structure development degree and distribution of seam, has important effect on reservoir permeability. By measuring actual joints and staging actual measurement joints with stereographic projection method, the paper studied tectonic evolution of Yanchuannan block, features of tectonic stress field and inversion analysis method of ancient tectonic stress. Mohr Coulomb fracturing criterion gives a way to estimate value of ancient tectonic stress, which could be calculated through the changes of rupture angles of conjugated shear joints. Two periods of tectonic stress distribution were simulated, and reflected two periods of ancient tectonic stress field distribution. The maximum principal stress value of Yanshanian tectonic stress field of 70~80 MPa in the southeast region was gradually reduced to 20~30 MPa in the northwest region, and the maximum principal stress value of Himalayan tectonic stress field of 60~70 MPa in the northeast region was gradually reduced to 20 MPa in the southwest region.
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