构造变形对现今地应力方向的影响
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摘要
现今地应力场方向是油气藏开发方案编制、储层改造、注水开发等需要考虑的关键因素之一,针对构造变形对局部应力场方向的影响进行了研究。首先利用反映区域现今地应力场方向的各种资料确定了盐井沟构造沙溪庙组所在区域的现今地应力方向;利用钻井岩心进行了岩心古地磁定向、波速各向异性等实验,分析了构造核部钻井中现今地应力方向,对比发现井点处现今地应力方向与区域地应力方向不吻合,发生明显偏转;通过计算构造变形派生应力并与区域现今地应力场进行矢量叠加计算,认为现今地应力方向的偏转主要受构造变形所致。研究表明局部构造变形是造成现今地应力方向变化的一个重要因素,研究必须考虑大幅度变形构造上现今地应力方向。
Current geo-stress orientation is one of the factors critical to oil and gas reservoir development scheme programming, reservoir reconstruction, and waterflooding development. This paper is to study the effect of tectonic deformation on local geo-stress orientation. Firstly, the data reflecting the current geo-stress orientation are used to determine the current geo-stress orientation of the area where the Shaximiao Formation of Yanjinggou Structure is located. The geo-stress orientation during the drilling of the core of structures is analyzed by conducting the experiment on palaeomagnetic direction and wave velocity anisotropy using drill core. Comparative analysis shows that the geo-stress orientation of the well spots does not coincide with the local geo-stress orientation, and it deflects obviously. Through the overlying calculation between the tectonic deformation induced stress and the local current geo-stress, it is considered that the deflection of current geo-stress orientation is mainly caused by tectonic deformation. Research in this paper shows that local tectonic deformation is a major factor leading to the variation of current geo-stress orientation. So the research on current geo-stress orientation of deformed structures must be paid great attention.
Current geo-stress orientation is one of the factors critical to oil and gas reservoir development scheme programming, reservoir reconstruction, and waterflooding development. This paper is to study the effect of tectonic deformation on local geo-stress orientation. Firstly, the data reflecting the current geo-stress orientation are used to determine the current geo-stress orientation of the area where the Shaximiao Formation of Yanjinggou Structure is located. The geo-stress orientation during the drilling of the core of structures is analyzed by conducting the experiment on palaeomagnetic direction and wave velocity anisotropy using drill core. Comparative analysis shows that the geo-stress orientation of the well spots does not coincide with the local geo-stress orientation, and it deflects obviously. Through the overlying calculation between the tectonic deformation induced stress and the local current geo-stress, it is considered that the deflection of current geo-stress orientation is mainly caused by tectonic deformation. Research in this paper shows that local tectonic deformation is a major factor leading to the variation of current geo-stress orientation. So the research on current geo-stress orientation of deformed structures must be paid great attention.
引文
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[2]周文,闫长辉,王世泽,等.油气藏现今地应力场评价方法及应用[M].北京:地质出版社,2007:3-5,17-25,48-72.ZHOU Wen,YAN Changhui,WANG Shize,et al.Evalua-tion method of reservior in-situ stress and its applicatio[nM].Beijing:Geologicscience Press,2007:3-5,17-25,48-72.
[3]傅鹤林.岩石声发射的Kaiser效应及其在地应力场测试中的应用[J].化工矿物与加工,2002,3(5):20-22.FU Helin.Application of kaiser effect of acoustic emission in monitoring ground stress[J].Industrial Minerals and Porocessing,2002,3(5):20-22.
[4]曾立新.开展地应力岩石Kaiser效应测试技术改造低渗透率储层[J].钻采工艺,2000,23(5):32-34.ZENG Lixin.Rock stress testing technology in remodeling low permeability layers[J].Drilling&Production Tech-nology,2000,23(5):32-34.
[5]A ADNOY,BERNT SIGVE.In-situ stress directions from borehole fracture traces[J].Journal of Petroleum Science&Engineering,1990,4(2):143-153.
[6]A FGHOUL,ALI Chareuf.The next generation[J].Oilfield Review,2004,16(1):38-57.
[7]葛洪魁,林英松,王顺昌.水力压裂地应力测量有关技术问题的讨论[J].石油钻采工艺,1998,20(6):53-56.GE Hongkui,LIN Yingsong,WANG Shunchang.Discussion on technical problems related to measurement of earth stress through hydraulic fracturing[J].Oil Drilling&Produc-tion Technology,1998,20(6):53-56.
[8]刘云彬,安广柱,张烈辉.用微地震波法确定松辽盆地头台油田地应力场特征[J].大庆石油地质与开发,2006,25(3):29-31.LIU Yunbin,AN Guangzhu,ZHANG Liehui.Confirming characteristics of ground stress field of toutai oil field in songliao basin by microseismic wave method[J].Petro-leum Geology&Oilfield Development in Daqing,2006,25(3):29-31.
[9]张兴权,安玉玲.天然地震与构造裂缝、油气运移的关系研究[J].石油勘探与开发,2000,27(4):106-108.ZHANG Xingquan,AN Yuling.The relations among the natural earthquake and structural fracture and oil-gas migra-tion[J].Petroleum Exploration and Development,2000,27(4):106-108.
[10]刘显太,戴俊生,徐建春,等.纯41断块沙四段现今地应力场有限元模拟[J].石油勘探与开发,2003,30(3):126-128.LIU Xiantai,DAI Junsheng,XU Jianchun,et al.Finite ele-ment simulation of the present ground stress field of Sha-4member in the Chun-41fault block[J].Petroleum Ex-ploration and Development,2003,30(3):26-128.
[11]国家地震科学数据共享中心.专题数据-中国震例[EB/OL],http://data.earthquake.cn/data/,1993-2008.China Earthquake Data Center.Dissertation dada-China earthquake case[EB/OL].http://data.earthquake.cn/data/,1993-2008.
[12]周文,高雅琴,单钰铭,等.川西新场气田沙二段致密砂岩储层岩石力学性质[J].天然气工业,2008,28(2):34-37.ZHOU Wen,GAO Yaqin,SHAN Yuming,et al.Lithome-chanical property of tight sand reservoirs in the second member of Shaximiao formation in Xinchang gas field,west Sichuan basin[J].Natural Gas Industry,2008,28(2):34-37.
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