梨树断陷断陷期小宽断裂带构造应力场数值模拟
|
摘要
在小宽断裂带构造解析基础之上,根据地质资料以及前人提供的岩石物理学参数建立了梨树断陷区的二维地质和数值模型。进行了构造应力场数值模拟,分析了梨树断陷小宽断裂带断陷期小宽断裂带断陷期在沙河子期(K_1sh)、营城期(K_1yc)、登楼库期(K_1d)的构造应力场特征。模拟结果显示:(1)沙河子期在左旋走滑应力状态下,小宽断裂带处于近NE—SW方向的拉张应力状态,剪应力在沿着断裂带SW—NE走向逐渐减小;(2)营城期在右旋走滑的应力状态下,小宽断裂带处于近NW—SE向的拉张力状态,剪应力最大值位于断裂带的最中间部位;(3)登楼库期在左旋走滑的应力状态下,断裂带处于SWW—NEE向的张拉应力状态,剪应力最大值位于断裂带西南段。
Based on the structural analysis of the Xiaokuan fault zone,a two-dimensional geological model for the Lishu fault depression area was established on available geological data and petrophysical parameters.The numerical simulation of tectonic stress field was carried out taking the Lishu fault as a case.Studied are the characteristics of tectonic stress field in the Shahezi period(K_1sh),the Yingcheng period(K_1yc),and the Denglouku period(K_1d)during the fault depression period of the Xiaokuan fault zone.The simulation results show that:(1)Under the left-lateral strike-slip stress state of K_1sh,the Xiaokuan fault zone was in a tensile stress state in NE-SW direction,and the Coulomb shear stress gradually decreased along the SW-NE direction;(2) Under the stress state of K_1yc right-lateral strike-slip,the Xiaokuan fault zone was in a tensional state near NW-SE direction,the maximum Coulomb shear stress was located in the middle part of the fault zone;(3)the left-lateral strike-slip in K_1d was under a tensile stress state of SWW-NEE direction,and the maximum Coulomb shear stress is located in the southwestern section of the fault zone.
Based on the structural analysis of the Xiaokuan fault zone,a two-dimensional geological model for the Lishu fault depression area was established on available geological data and petrophysical parameters.The numerical simulation of tectonic stress field was carried out taking the Lishu fault as a case.Studied are the characteristics of tectonic stress field in the Shahezi period(K_1sh),the Yingcheng period(K_1yc),and the Denglouku period(K_1d)during the fault depression period of the Xiaokuan fault zone.The simulation results show that:(1)Under the left-lateral strike-slip stress state of K_1sh,the Xiaokuan fault zone was in a tensile stress state in NE-SW direction,and the Coulomb shear stress gradually decreased along the SW-NE direction;(2) Under the stress state of K_1yc right-lateral strike-slip,the Xiaokuan fault zone was in a tensional state near NW-SE direction,the maximum Coulomb shear stress was located in the middle part of the fault zone;(3)the left-lateral strike-slip in K_1d was under a tensile stress state of SWW-NEE direction,and the maximum Coulomb shear stress is located in the southwestern section of the fault zone.
引文
[1]包林海,杜义,郭啟良,等.成兰铁路地应力测量与构造应力场分布规律研究[J].地质力学学报,2017,23(5):734-742.
[2]王珂,张惠良,张荣虎,等.塔里木盆地大北气田构造应力场解析与数值模拟[J].地质学报,2017,91(11):2557-2572.
[3]徐荣忠.东北梨树断陷断陷期构造应力场分析[D].西安:西安石油大学,2014.
[4]王黎,王果寿,邱岐,等.松辽盆地梨树断陷深部层系沉积特征及演化分析[J].石油实验地质,2014,36(3):316-324+390.
[5]曲少东.松辽盆地梨树断陷构造演化及区域动力学背景[D].西安:西北大学,2013.
[6]曲少东,刘池阳,宋立军,等.梨树断陷小宽断裂带构造特征及演化[J].西北大学学报:自然科学版,2013,43(4):612-616.
[7]刘先林,唐正辉.三维地质建模与数值模拟关键技术研究[J].西部交通科技,2016(5):1-5+9.
[8] Djebbar T.,周灿灿.岩石物理学[J].中国石油勘探,2016,21(2):99.
[9]宋淑霞.松辽盆地梨树断陷盆地模拟及含油气系统分析[D].西安:西安石油大学,2017.
[10]丰成君,戚帮申,张鹏,等.汶川Ms8.0地震后龙门山断裂带地壳应力场及其构造意义[J].地质力学学报,2018,24(4):439-451.
[11]王宇,卢玲,李文韬.基于Ansys的有限元网格划分方法应用研究[J].起重运输机械,2014(3):53-56.
[2]王珂,张惠良,张荣虎,等.塔里木盆地大北气田构造应力场解析与数值模拟[J].地质学报,2017,91(11):2557-2572.
[3]徐荣忠.东北梨树断陷断陷期构造应力场分析[D].西安:西安石油大学,2014.
[4]王黎,王果寿,邱岐,等.松辽盆地梨树断陷深部层系沉积特征及演化分析[J].石油实验地质,2014,36(3):316-324+390.
[5]曲少东.松辽盆地梨树断陷构造演化及区域动力学背景[D].西安:西北大学,2013.
[6]曲少东,刘池阳,宋立军,等.梨树断陷小宽断裂带构造特征及演化[J].西北大学学报:自然科学版,2013,43(4):612-616.
[7]刘先林,唐正辉.三维地质建模与数值模拟关键技术研究[J].西部交通科技,2016(5):1-5+9.
[8] Djebbar T.,周灿灿.岩石物理学[J].中国石油勘探,2016,21(2):99.
[9]宋淑霞.松辽盆地梨树断陷盆地模拟及含油气系统分析[D].西安:西安石油大学,2017.
[10]丰成君,戚帮申,张鹏,等.汶川Ms8.0地震后龙门山断裂带地壳应力场及其构造意义[J].地质力学学报,2018,24(4):439-451.
[11]王宇,卢玲,李文韬.基于Ansys的有限元网格划分方法应用研究[J].起重运输机械,2014(3):53-56.