油气藏评价与开发 >
2021 , Vol. 11 >Issue 2: 190 - 196
DOI: https://doi.org/10.13809/j.cnki.cn32-1825/te.2021.02.007
渝东南川地区龙马溪组地应力场特征
收稿日期: 2020-09-21
网络出版日期: 2021-04-30
基金资助
中国石化项目“渝东南盆缘转换带页岩气富集主控因素研究”(P18057-2);油气资源与探测国家重点实验室开放基金“前陆冲断带横向断层差异变形机理研究”(wx2018115)
Characteristics of geostress field of Longmaxi Formation in Nanchuan area, Eastern Chongqing
Received date: 2020-09-21
Online published: 2021-04-30
地应力场的研究对于南川地区页岩气的开发具有重要的理论和现实意义。为明确渝东南川地区志留系龙马溪组现今地应力场的分布情况,通过区内钻井的井壁坍塌方向确定了现今地应力的水平最大主应力方向,并收集区内钻井的地应力大小。通过地震资料计算区内岩石力学参数的分布情况,结合南川地区志留系龙马溪组底界构造图划分地质单元,建立地质模型。利用关键井的地应力资料作为约束,进行了南川地区龙马溪组地应力场的有限元数值模拟,分析了地应力场的分布规律。研究结果表明,区域地应力场以挤压应力场为主,现今最大主应力的方向约为NEE25°—SEE20°,大小为56.12 ~ 93.79 MPa;最小主应力的方向约为NNW25°—NNE20°,大小为48.06 ~ 71.67 MPa。应力大小整体上呈现了东低西高的分布趋势,断层对地应力方向和大小均有影响,岩石力学性质对地应力大小也有影响。
张斗中 , 汤济广 , 蔡俊 . 渝东南川地区龙马溪组地应力场特征[J]. 油气藏评价与开发, 2021 , 11(2) : 190 -196 . DOI: 10.13809/j.cnki.cn32-1825/te.2021.02.007
The study of geostress field has important theoretical and practical significance for the development of shale gas in Nanchuan area. In order to determine the distribution of the current geostress field of Silurian Longmaxi Formation in Nanchuan area, Eastern Chongqing, the maximum horizontal principal stress direction of the current geostress has been determined according to the direction of borehole collapse of key wells in the area, and the magnitude of the geostress of drilled wells has been collected. The distribution of the rock mechanics parameters in the area has been calculated on the basis of the seismic data, the geological units have been divided based on the tectonic map of the bottom of Silurian Longmaxi Formation in Nanchuan area, and a geological model has been established. Taking the ground stress data of key wells as the constraint, the finite element numerical simulation of the geostress field of Longmaxi Formation in Nanchuan area has been carried out, and the distribution law of the geostress field has been analyzed. The results show that the main stress field is the extrusion stress field. The current maximum principal stress is about NEE25° to SEE20°, 56.12~93.79 MPa while the minimum principal stress is approximately NNW25° to NNE20°, 48.06~71.67 MPa. On the whole, the stress has a distribution trend of low in the east and high in the west. The fault has an influence on the direction and the magnitude of the stress while the mechanical properties of rocks also influence the stress magnitude.
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