南川地区页岩层古构造应力分布特征及构造裂缝预测  

Characteristics of Paleo-tectonic Stress Field and Structural Fissure Prediction of Shale in Nanchuan Area

作　　者：刘明 李彦婧 潘兰 Liu Ming;Li Yanjing;Pan Lan(Exploration and Development Research Institute,Sinopec East China Oil&Gas Company,Jiangsu,210019)

机构地区：[1]中国石油化工股份有限公司华东油气分公司勘探开发研究院,江苏210019

出　　处：《当代化工研究》2022年第24期52-56,共5页Modern Chemical Research

基　　金：中国石油化工股份有限公司科技开发部项目“常压页岩气地球物理评价技术研究”(项目编号:P21087-3)。

摘　　要：为系统地研究构造应力场及构造裂缝对页岩气开发的控制作用,基于有限单元数值模拟方法,结合岩石声发射和三轴强度试验,针对南川地区燕山中期和燕山晚期构造变形时期进行古构造应力场数值模拟,并对构造裂缝发育情况进行定量预测。结果表明,燕山中期以北北西-南南东向挤压应力为主,燕山晚期为近东西向挤压应力,研究区内构造应力方向基本一致,平面分布受断层和构造形态控制明显,平桥背斜核部及东南部埋藏浅部位、断裂带附近处于应力低值区。根据数值模拟结果,参考岩心和成像测井裂缝密度资料,认为南川地区断裂大多形成于燕山中期,构造裂缝走向以北东-南西向为主,后期叠加北西-南东走向裂缝,不同构造部位之间构造裂缝具有差异性,断裂带附近及构造高部位为裂缝发育区。In order to systematically study the control of tectonic stress field and structural fissure on shale gas development, based on the finite element numerical simulation method, combined with rock acoustic emission and triaxial strength test, the numerical simulation of paleo-tectonic stress field was carried out in the Middle and Late Yanshanian in Nanchuan area, and the distribution of structural fissure was predicted quantitatively. The results showed that the direction of compression stress was mainly NNW-SSE in Middle Yanshanian while it was nearly EW in Late Yanshanian. The tectonic stress directions of study area were basically the same. Paleo-tectonic stress was obviously controlled by faults and structural feature in plane.The shallow burial area in southeastern, core of Pingqiao anticline and near the fault zone were in low tectonic stress area. According to the results of numerical simulation and referring to the fracture density data from core and imaging logging, it was considered that most faults of Nanchuan area were formed in Middle Yanshanian. The structural fissure were mainly in NE-SW trend then were superimposed to NW-SE trend later. The structural fissure were different between different structural positions. The fissure developing area was near the fault zone and structural high part.

关 键 词：南川地区 五峰-龙马溪组 古构造应力场 数值模拟 构造裂缝预测 

分 类 号：TE132[石油与天然气工程—油气勘探]