合川地区须二段现今地应力场分布特征与扰动机制研究  

DISTRIBUTION CHARACTERISTICS AND DISTURBANCE MECHANISM OF PRESENT IN-SITU STRESS FIELD IN THE SECOND MEMBER OF XUJIAHE FORMATION IN HECHUAN AREA

作　　者：张小菊 何建华 徐庆龙[3] 叶泰然[4] 邓虎成[2] 徐争启[1] 曹峰 阮韵琪 ZHANG Xiaoju;HE Jianhua;XU Qinglong;YE Tairan;DENG Hucheng;XU Zhengqi;CAO Feng;RUAN Yunqi(Collegeof Earth Sciences,ChengduUniversityof Technology,Chengdu,Sichuann610059,China;College of Energy,ChengduUniversity of Technology,Chengdu,Sichuan 610059,China;Research Institute of Erploration and Development of Daqing Oilfield Co.,Ltd.,Daqing,Heilongjiang 163000,China;Research Institute of Erploration and Development,Sinopec Southwest China Oil and Gas Company,Chengdu,Sichuan 610041,China)

机构地区：[1]成都理工大学地球科学学院,四川成都610059 [2]成都理工大学能源学院,四川成都610059 [3]大庆油田有限责任公司勘探开发研究院,黑龙江大庆163000 [4]中国石油化工股份有限公司西南油气分公司勘探开发研究院,四川成都610041

出　　处：《矿物岩石》2022年第4期71-82,共12页Mineralogy and Petrology

基　　金：国家十三五重大专项任务“鄂南致密低渗油藏水力压裂裂缝起裂及扩展规律”(项目编号:2016ZX05048001-04-LH);深地科学与工程教育部重点实验室开放基金项目“深层复杂构造带页岩钻井地应力剖面扰动的力学机理及关键评价技术研究”(项目编号:DESEYU 202102);四川省科技厅重点苗子项目“基于多源数据驱动的深层页岩储层钻井地应力剖面智能构建技术研究”(项目编号:22MZGC0159);四川省科技厅重点苗子项目“断裂组合样式对气态烃运移的影响机制研究”(项目编号:2021096)。

摘　　要：合川地区须二段复杂构造条件给油气资源勘探开发带来了极大挑战,特别是对地应力大小、方向及展布规律的认识不清,严重制约了该区工程甜点优选、水平井井位部署及压裂改造施工。在研究区目的层油气勘探开发过程中呈现出来的众多问题都与地应力有着密切关系,同时,油气勘探开发对深层地应力研究的需求也越来越大,特别是地应力的大小和方向对于油气田开发有着重大意义。本次研究主要是基于岩芯、测井、实验测试分析等资料,采用声发射实验、测井解释地应力大小方法、岩芯古地磁定向实验测试方法、电成像测井资料解释地应力方向方法和地应力场数值模拟方法来开展合川地区须二段现今地应力场特征及分布规律研究。结果表明研究区须二2亚段三向应力具有最大主应力>垂向主应力>最小主应力的特征,西南部三向应力值相对较小;而东北部三向应力值较大;在主河道砂体分布区的两向差异系数相对较高,分布在0.165~0.185;而在断裂带内部的两向差异系数最低,为0.100~0.125。西南部地区布井更容易形成体积缝网系统,合川地区须二2亚段砂岩现今最大主应力方向为NWW-SEE;合川地区三向应力关系符合走滑断层的应力状态,且最大水平主应力的分布规律整体上与沉积相的分布规律具有较高的一致性,表现在主河道砂体的最大水平主应力值相对较高,主体分布在56.1~58.8 MPa;且地应力方向沿着主河道岩性分界处偏转,合川地区须二2亚段平面上最大水平主应力方向在断层附近发生扰动,尤其在端点附近地应力方向向着端点发生明显偏转,而在断层内部最大水平主应力方向垂直于断层走向;而中间应力主要表现为垂直向下,同样在断层端点附近,应力扰动非常明显。在断裂影响区和岩性分界区进行水平井井位部署时,需要考虑现今地应力方向的扰动对其影响,合�The complex structural conditions of the second Member of Upper Triassic Xujiahe Formation(T_(3)χ^(2)) in Hechuan area of Chongqing have brought great challenges to the exploration and development of oil and gas resources, and the unclear understanding of the magnitude, directions and distribution of in-situ stress has seriously restricted the optimization of engineering sweet spots, well deployment of horizontal wells and fracturing reconstruction in this area. In the process of oil and gas exploration and development in the target layer of the study area, many problems are closely related to the in-situ stress. At the same time, the demand of oil and gas exploration and development for the study of deep in-situ stress is increasing, especially the magnitude and direction of in-situ stress is of great significance to the development of oil and gas fields. Based on the data of core, logging, laboratory test and analysis, combined with the methods of the acoustic emission experiment, the conventional logging interpretation, core ancient geomagnetic orientation experiment, electrical imaging logging interpretation and the in-situ stress field numerical simulation, the characteristics and distribution regularity of in-situ stress field of the T_(3)χ^(2) is studied. The results show that the maximum principal stress > vertical principal stress > minimum principal stress in T_(3)χ^(2) in the study area. The triaxial stress value in the southwest of the study area is relatively small, while the triaxial stress value in the northeast is large. The bidirectional differential coefficient is relatively high in the distribution area of main channel sand body(0.165-0.185), and the lowest in the inner fault zone(0.100-0.125). The current maximum principal stress direction of the T_(3)χ^(2) sandstone in Hechuan area is NWW-SEE, which accords with the stress state of the strike-slip fault. The distribution law of the maximum horizontal principal stress is consistent with that of the sedimentary facies on the whole, evidence

关 键 词：须二段 地应力 分布特征 合川地区 

分 类 号：P618.13[天文地球—矿床学]