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川东北宣汉-达县地区构造应力场对裂缝的控制

唐永 梅廉夫 陈友智 唐文军 肖安成

唐永, 梅廉夫, 陈友智, 等, 2012. 川东北宣汉-达县地区构造应力场对裂缝的控制. 地质力学学报, 18 (2): 120-139.
引用本文: 唐永, 梅廉夫, 陈友智, 等, 2012. 川东北宣汉-达县地区构造应力场对裂缝的控制. 地质力学学报, 18 (2): 120-139.
TANG Yong, MEI Lian-fu, CHEN You-zhi, et al., 2012. CONTROLLING OF STRUCTURAL STRESS FIELD TO THE FRACTURES IN XUANHAN-DAXIAN REGION, NORTHEASTERN SICHUAN BASIN, CHINA. Journal of Geomechanics, 18 (2): 120-139.
Citation: TANG Yong, MEI Lian-fu, CHEN You-zhi, et al., 2012. CONTROLLING OF STRUCTURAL STRESS FIELD TO THE FRACTURES IN XUANHAN-DAXIAN REGION, NORTHEASTERN SICHUAN BASIN, CHINA. Journal of Geomechanics, 18 (2): 120-139.

川东北宣汉-达县地区构造应力场对裂缝的控制

基金项目: 

中国地质大学构造与油气资源教育部重点实验室开放研究基金项目 TPR-2011-26

详细信息
    作者简介:

    唐永(1981-), 男, 在站博士后, 主要从事构造应力场分析及模拟研究。E-mail:water_0820@163.com

  • 中图分类号: P553

CONTROLLING OF STRUCTURAL STRESS FIELD TO THE FRACTURES IN XUANHAN-DAXIAN REGION, NORTHEASTERN SICHUAN BASIN, CHINA

  • 摘要: 川东北宣汉-达县地区晚白垩世受到南东方向的挤压作用,始新世晚期-渐新世早期受到北东方向的挤压作用,两期构造活动导致宣汉-达县地区下三叠统飞仙关组碳酸盐岩中形成构造裂缝,对油气藏开发产生较大的影响。在考虑岩层与岩层之间相互影响的基础上,结合共轭节理和机械双晶的分析结果,利用三维有限元分析技术,计算宣汉-达县地区飞仙关组古构造应力大小,获得了两期古构造应力场的分布特征。通过岩石破裂阈值的限定,对普光、毛坝区块构造裂缝(张裂缝和剪裂缝)的发育区域进行预测,依据综合破裂率对岩层破裂强度进行评价,为提高裂缝钻遇率,降低勘探开发风险提供了科学的地质依据。

     

  • 图  1  川东北宣汉—达县地区地质构造示意图

    Figure  1.  The schematic diagram on Xuanhan-Daxian region, Northeastern Sichuan Basin

    图  2  大巴山构造带与江南-雪峰构造带活动时序[16]

    Figure  2.  Ages of evolutionary characteristics in Daba Mountain and Jiangnan-Xuefeng tectonic zones

    图  3  川东北宣汉—达县地区构造层(NM-00-44)

    Figure  3.  Structural layeres in Xuanhan-Daxian region, Northeastern Sichuan Basin

    图  4  宣汉—达县地区数值模拟区域

    Figure  4.  The numerical calculation domain for Xuanhan-Daxian region

    图  5  宣汉—达县地区三维有限元分析物理模型

    Figure  5.  Three dimensional finite element analysis of physical models on Xuanhan-Daxian region

    图  6  宣汉—达县地区最大剪应力三维分布图

    Figure  6.  The maximum shear stress three dimension distribution of Xuanhan-Daxian region

    图  7  飞仙关组燕山晚期最大主应力分布图

    Figure  7.  The maximum principal stress distribution of Feixianguan formation in the Late Yanshan epoch

    图  8  飞仙关组燕山晚期最大剪应力分布图

    Figure  8.  The maximum shear stress distribution of Feixianguan formation in the Late Yanshan epoch

    图  9  飞仙关组燕山晚期最大主应变量分布图

    Figure  9.  The maximum principal strain distribution of Feixianguan formation in the Late Yanshan epoch

    图  10  飞仙关组喜马拉雅期最大主应力分布图

    Figure  10.  The maximum principal stress distribution of Feixianguan formation in the Himalayan epoch

    图  11  飞仙关组喜马拉雅期最大剪应力平面分布图

    Figure  11.  The maximum shear stress distribution of Feixianguan formation in the Himalayan epoch

    图  12  飞仙关组喜马拉雅期最大主应变量平面分布图

    Figure  12.  The maximum principal strain distribution of Feixianguan formation in the Himalayan epoch

    图  13  普光-毛坝区块飞仙关组燕山晚期裂缝发育区

    Figure  13.  The fracture distributions of Feixianguan Formation in the Puguang-Maoba block during Late Yanshan epoch

    图  14  普光-毛坝区块飞仙关组破裂程度

    Figure  14.  Fracturing degrees of Feixianguan Formation in the Puguang-Maoba block

    图  15  普光-毛坝区块飞仙关组喜马拉雅期裂缝发育区

    Figure  15.  The fracture distributions of Feixianguan Formation in the Puguang-Maoba block during Himalayan epoch

    图  16  普光、毛坝区块岩心裂缝密度统计

    Figure  16.  Fracture density statistic to cores in the Puguang and Maoba blocks

    表  1  研究区力学层划分

    Table  1.   Mechanical layers division about study area

    表  2  宣汉—达县地区各个力学层力学物理参数

    Table  2.   Physical and mechanical Parameters of Mechanical layers on Xuanhan-Daxian region

    表  3  宣汉—达县地区物理模型边界条件

    Table  3.   The choice boundary conditions of physical models on Xuanhan-Daxian region

    表  4  利用共轭角计算燕山晚期、喜马拉雅期最大差应力值

    Table  4.   Maximum differential stresses calculated by using conjugate angle in the Late Yanshan and Himalayan

    表  5  利用方解石机械双晶计算喜马拉雅期差应力

    Table  5.   The differential stresses using calcite mechanicaltwinning in the Himalayan epoch

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