CAJ | 학술논문

古构造应力控制煤层构造发育程度及其分布，影响煤层储层渗透性。通过现场对煤层及其上覆岩层中节理裂隙的实测，并应用赤平投影方法将实测节理裂隙进行分期和配套分析，研究了延川南区块构造演化规律、古构造应力场特征和古构造应力的反演方法。根据摩尔库伦破裂准则，通过共轭剪断裂破裂角的大小变化来估算古构造应力场主应力值。利用 ANSYS 有限元软件，模拟了本区两期古构造应力场分布，揭示出其古构造应力场的分布规律为：燕山期构造应力场最大主应力值由东南区域的70~80 MPa逐渐降至西北区域的20~30 MPa；喜马拉雅期构造应力场最大主应力值由东北区域的60~70 MPa逐渐降至西南区域的20 MPa。
고구조응력공제매층구조발육정도급기분포，영향매층저층삼투성。통과현장대매층급기상복암층중절리렬극적실측，병응용적평투영방법장실측절리렬극진행분기화배투분석，연구료연천남구괴구조연화규률、고구조응력장특정화고구조응력적반연방법。근거마이고륜파렬준칙，통과공액전단렬파렬각적대소변화래고산고구조응력장주응력치。이용 ANSYS 유한원연건，모의료본구량기고구조응력장분포，게시출기고구조응력장적분포규률위：연산기구조응력장최대주응력치유동남구역적70~80 MPa축점강지서북구역적20~30 MPa；희마랍아기구조응력장최대주응력치유동북구역적60~70 MPa축점강지서남구역적20 MPa。
Ancient tectonic stress controls structure development degree and distribution of seam, has important effect on reservoir permeability. By measuring actual joints and staging actual measurement joints with stereo-graphic projection method, the paper studied tectonic evolution of Yanchuannan block, features of tectonic stress field and inversion analysis method of ancient tectonic stress. Mohr Coulomb fracturing criterion gives a way to estimate value of ancient tectonic stress, which could be calculated through the changes of rupture angles of con-jugated shear joints. Two periods of tectonic stress distribution were simulated, and reflected two periods of ancient tectonic stress field distribution. The maximum principal stress value of Yanshanian tectonic stress field of 70~80 MPa in the southeast region was gradually reduced to 20~30 MPa in the northwest region, and the maximum prin-cipal stress value of Himalayan tectonic stress field of 60~70 MPa in the northeast region was gradually reduced to 20 MPa in the southwest region.