Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing, 100081, China.
Department of Civil and Environmental Engineering, Geological Engineering Program, University of Wisconsin-Madison, Madison, WI, 53706, USA.
Sci Rep. 2017 Jul 3;7(1):4503. doi: 10.1038/s41598-017-04516-9.
The in-situ stress state in the Tarim Basin, Northwest China, down to 7 km depth is constrained using the anelastic strain recovery (ASR) method and wellbore failure analysis. Results are consistent between the two methods, and indicate that the maximum principal stresses (σ) are close to vertical and the intermediate and minimum principal stresses (σ and σ) are approximately horizontal. The states of stress at the studied wellbore is in the normal faulting stress regime within the Tarim Basin rather than in the compressional tectonic stress regime as in the periphery of the Tarim Basin, which explains the presence of the normal faults interpreted in 3-D seismic profiles collected from adjacent areas. Our results demonstrate that the ASR method can be used for rocks recovered from depths as deep as 7 km to recover reliable stress state information. The in-situ stress measurement results revealed in this paper will help future development of the petroleum resources and kinematics study in the Tarim Basin.
利用粘弹性应变恢复（ASR）法和井壁破坏分析，对中国西北部塔里木盆地 7km 深处的原地应力状态进行了约束。两种方法的结果一致，表明最大主应力（σ）接近垂直，中间主应力（σ）和最小主应力（σ）近于水平。研究井眼处的应力状态处于塔里木盆地正常断陷应力状态，而不是塔里木盆地周边的挤压构造应力状态，这解释了在邻近地区采集的三维地震剖面上解释的正断层的存在。我们的结果表明，ASR 法可用于从深达 7km 的深度回收的岩石，以恢复可靠的应力状态信息。本文揭示的原地应力测量结果将有助于塔里木盆地未来的石油资源开发和运动学研究。
