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X射线衍射残余应力测试技术在纤维状方解石脉体现今应力状态分析中的应用
马存飞1,2,董春梅1,2,王倩3,孙钰4,封猛5,刘振阳4,杨国杰4,于大川6,郭瑷铭7,袁月1
(1.中国石油大学(华东)深层油气重点实验室,山东青岛 266580;2.中国石油大学(华东)山东省油藏地质重点实验室,山东青岛 266580;3.中国石油新疆油田勘探开发研究院,新疆克拉玛依 834000;4.中国石化胜利油田勘探开发研究院,山东东营 257100;5.中国石油西部钻探工程有限公司,新疆克拉玛依 834000;6.中国石化胜利油田东辛采油厂,山东东营 257100;7.赢洲科技(上海)有限公司,上海 201100)
摘要:
以济阳坳陷沙三下—沙四上亚段富有机质页岩中发育的纤维状方解石脉体为研究对象,采用X射线衍射残余应力测试技术定量获得方解石脉体受到的现今应力类型及大小,建立方解石脉体剪切破裂的应力模型和判别式,明确方解石脉体中破裂线的力学成因,并分析孔隙流体压力对方解石脉体发育的影响。结果表明:纤维状方解石脉体的垂向有效应力为59 MPa,水平有效应力为16 MPa,处于三向挤压的空间应力状态中;任意剖面上的有效应力模型和剪切破裂判别式决定了方解石脉体表现为共轭剪切破裂,破裂线呈折线状或曲线状,理论破裂角为45°或28°,与薄片实际测量结果一致但也受薄片磨制方向影响;孔隙流体压力导致正应力减小而剪应力不变,影响页岩岩石骨架或方解石脉体的破裂方式。
关键词:  纤维状方解石脉体  残余应力  应力模型  破裂线  孔隙流体压力
DOI:10.3969/j.issn.1673-5005.2021.01.003
分类号::TE 122.1
文献标识码:A
基金项目:
Application of X-ray diffraction residual stress testing technology in the analysis of present stress state of fibrous calcite vein
MA Cunfei1,2, DONG Chunmei1,2, WANG Qian3, SUN Yu4, FENG Meng5, LIU Zhenyang4, YANG Guojie4, YU Dachuan6, GUO Aiming7, YUAN Yue1
(1.Key Laboratory of Deep Oil and Gas in China University of Petroleum (East China), Qingdao 266580, China;2.Shandong Provincial Key Laboratory of Reservoir Geology in China University of Petroleum (East China), Qingdao 266580, China;3.Research Institute of Exploration and Development, Xinjiang Oilfield Company, Karamay 834000, China;4.Shengli Oilfield Exploration and Development Research Institute, SINOPEC, Dongying 257100, China;5.Xibu Drilling Engineering Company Limited, CNPC, Karamay 834000, China;6.Dongxin Oil Production Plant, Shengli Oil Field Branch, SINOPEC, Dongying 257100, China;7.Win Zoner Technology (Shanghai) Limited, Shanghai 201100, China)
Abstract:
Taking the fibrous calcite vein developed in the organic-rich shale from the lower Es3 to upper Es4 of Jiyang Depression as the research object, this paper quantitatively obtains the present stress type and size of the fibrous calcite by an X-ray diffraction residual stress testing technology, and establishes the stress model of the shear fracture of the calcite vein. The mechanical origin of fracture line in the calcite vein is determined and the influence of pore fluid pressure on the development of the calcite vein is analyzed. The results show that the vertical effective stress of the fibrous calcite vein is 59 MPa, the horizontal effective stress is 16 MPa, and the fibrous calcite vein is in the state of three-dimensional compression space stress. The effective stress model and the shear fracture discriminant on arbitrary section determine that the calcite vein appears as conjugate shear fracture. The fracture is a polyline or curved, and the theoretical fracture angle is 45° or 28°, which are consistent with the actual measurements from thin sections, but could also be affected by the polished direction of the thin section. The pore fluid pressure causes the normal stress to decrease while the shear stress remains unchanged, which affects the fracture mode of the shale rock skeleton or the calcite vein.
Key words:  fibrous calcite vein  residual stress  stress model  fracture line  pore fluid pressure
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