基于CO_(2)注入的断层失稳渗流—应力耦合分析  

Coupled seepage-stress analysis of fault instability induced by CO_(2) injection

作　　者：张星 贾善坡 徐萌 张品金 李健 张鲁钢 ZHANG Xing;JIA Shanpo;XU Meng;ZHANG Pinjin;LI Jian;ZHANG Lugang(College of Earth Science,Northeast Petroleum University,Daqing,Heilongjiang 163318,China;Research Institute of Exploration and Development,SINOPEC Shengli Oilfield Company,Dongying,Shandong 257000,China)

机构地区：[1]东北石油大学地球科学学院,黑龙江大庆163318 [2]中国石化胜利油田分公司勘探开发研究院,山东东营257000

出　　处：《东北石油大学学报》2023年第3期69-78,88,I0006,共12页Journal of Northeast Petroleum University

基　　金：国家自然科学基金项目(42072166);黑龙江省自然科学基金项目(LH2020D004);国家重点研发计划项目(2022YFE0206800)。

摘　　要：低渗断层区域在CO_(2)注入过程中可能发生破坏。为确保注入过程中断层区域的力学稳定性,根据多孔弹性及断层稳定性理论,建立断层稳定性影响因素分析模型,研究M区块含水层圈闭构造低渗断层稳定性变化规律,进行断层区域稳定性评价。结果表明:在CO_(2)注入条件下,M区块断层区域达到临界失稳时间为16个月。低渗正断层周边应力场受到孔隙压力变化及储层膨胀的影响而表现为不同程度的波动,正应力场及剪切应力场变化对断层区域稳定性造成显著的影响。该结果为相似地质条件区块断层稳定性评价提供参考。Low permeability fault areas may be damaged during CO_(2) injection.In order to ensure the mechanical stability of the fault region during the injection process,an analysis model of the factors affecting the fault stability was established according to the theory of porous elasticity and fault stability,and the change rule of the stability of the low-permeability fault in the aquifer trap structure in M Block was studied to evaluate the stability of the fault region.The results show that the critical instability time of the fault region in M Block is 16 months under the condition of CO_(2) injection.The stress field around the low-permeability normal fault fluctuates to different degrees due to the changes of pore pressure and reservoir expansion,and the changes of the normal stress field and shear stress field have a significant impact on the stability of the fault region.The results provide reference for fault stability evaluation of blocks with similar geological conditions.

关 键 词：含水层圈闭 断层稳定性 多孔弹性 流固耦合理论 地应力场变化 数值模拟 

分 类 号：TE822[石油与天然气工程—油气储运工程]