THEORETICAL MODEL ABOUT FRACTURE POROSITY, PERMEABILITY AND STRESS FIELD IN THE LOW-PERMEABILITY SANDSTONE
-
摘要:
低渗透砂岩储集层普遍发育裂缝, 裂缝不仅是重要的流体渗流通道, 而且在油井周围的发育程度直接影响着油井的生产能力.目前裂缝定量化预测方面存在的焦点问题是:缺乏一个有效而合理的力学模型, 裂缝渗透性的求取方法仍处于半定量化, 不具通用性.以史深100块沙三中储集层为目标, 从应力场和裂缝主要参数的关系入手, 以裂缝开度为桥梁, 通过实验和理论推导的方法, 建立了构造应力场和裂缝孔隙度、渗透率之间的定量关系模型.在岩石力学参数测试结果和地质模型建立的基础上, 对目的层裂缝发育时期的古构造应力和现今地应力进行数值模拟, 将结果代入关系模型, 计算研究区裂缝孔隙度和渗透率的空间分布, 进而指导低渗透砂岩油藏的裂缝参数定量预测、产能规划及井网部署.
Abstract:Aiming at low-permeability sandstone, based on the principles of geological mechanics, using relationship between fracture parameters and stress field as a bridge, on the premise of reasonable preference of fracture criteria, through methods of tests and theoretical derivation, this paper establishes mechanical model between stress-strain and fracture parameters(porosity and permeability)to develop a set of quantitative methods. Results show that combining energy method with fracture criteria is effective approach to confirm the relationship between stress field and fracture parameters, after inner stress state reaching or exceeding failure conditions the fracture aperture, density will increase with strain energy density. At the same time, it is found that fractures in rock commonly formed under palaeostress field and their aperture and density were much larger than the present. Consequently, we can understand that current stress field goes against producing fractures and fracture aperture can be figured out through positive stress and shear stress acting on fracture face. Finally, Great success has been achieved in middle reservoirs of the third Shahejie Formation of Block Shishen100 in Shinan Oilfield by applying the program.
-
-
表 1 裂缝计算开度、线密度和实测开度、线密度对比
Table 1. Comparison of calculated opening and linear density with measured opening and linear density
下载: 导出CSV
-
[1] Snow D T.Rock fracture spacings, openings and porosities[J].Journal of the Soil Mechanics & Foundations Division, 1968, 94(SM1):73~91. http://cn.bing.com/academic/profile?id=039a1ea52d9a0265920734d94be733e9&encoded=0&v=paper_preview&mkt=zh-cn
[2] Kranzz R L, Frankel A D, Engelder T, et al.The permeability of whole and jointed Barre Granite[J].International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts, 1979, 16(4):225~234. http://cn.bing.com/academic/profile?id=f7d43799a9fa3591bbca0895c4e842f1&encoded=0&v=paper_preview&mkt=zh-cn
[3] Power W L, Durham W B.Topography of natural and artificial fractures in granitic rocks:Implications for studies of rock friction and fluid migration[J].International Journal of Rock Mechanic and Mining Sciences, 1997, 34(6):979~989. doi: 10.1016/S1365-1609(97)80007-X http://cn.bing.com/academic/profile?id=acd13db2f68687f0762a538edd745508&encoded=0&v=paper_preview&mkt=zh-cn
[4] Barton N, Choubey V.The shear strength of rock and rock joints in theory and practice[J].Rock Mechanics and Rock Engineering, 1977, 10(1-2):1~54. http://cn.bing.com/academic/profile?id=a92422fe6b13750ecbcab9fab28b5a49&encoded=0&v=paper_preview&mkt=zh-cn
[5] Barton N, Bandis S, Bakhtar K.Strength, deformation and conductivity coupling of rock joints[J].International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts, 1985, 22(3):121~140. http://cn.bing.com/academic/profile?id=286016df7fce97b6e854831d9870ba41&encoded=0&v=paper_preview&mkt=zh-cn
[6] Willis-Richards J, Watanabe K, Takahashi H.Progress toward a stochastic rock mechanics model of engineered geothermal systems[J].Journal of Geophysical Research, 1996, 101(B8):17481~17496. doi: 10.1029/96JB00882 http://cn.bing.com/academic/profile?id=83ef40208bcd484e7c0267d408eed53a&encoded=0&v=paper_preview&mkt=zh-cn
[7] Jing Z, Willis-Richards J, Watanabe K, et al. A new 3-D stochastic model for HDR geothermal reservoir in fractured crystalline rock[C]//Proceedings of the 4 th International HDR Forum. Strasbourg, 1998.
[8] Hicks T W, Pine R J, Willis Richards J, et al.A hydro-thermo-mechanical numerical model for HDR geothermal reservoir evaluation[J].International Journal of Rock Mechanics and Mining Sciences&Geomechanics Abstracts, 1996, 33(5):499~511. http://cn.bing.com/academic/profile?id=5d4da71b906fc9a844989b7273d72680&encoded=0&v=paper_preview&mkt=zh-cn
[9] 赵阳升, 杨栋, 郑少河, 等.三维应力作用下岩石裂缝水渗流物性规律的实验研究[J].中国科学:E辑, 1999, 29(1):82~86. http://kns.cnki.net/KCMS/detail/detail.aspx?filename=jexk199901010&dbname=CJFD&dbcode=CJFQ
ZHAO Yang-sheng, YANG Dong, ZHENG Shao-he, et al.Experimental study on the physical properties of fluid seepage in rift under the 3-D stress field[J].Science in China:Series E, 1999, 29(1):82~86. http://kns.cnki.net/KCMS/detail/detail.aspx?filename=jexk199901010&dbname=CJFD&dbcode=CJFQ
[10] 宋惠珍, 贾承造, 欧阳健, 等.裂缝性储集层研究理论与方法---塔里木盆地碳酸盐岩储集层裂缝预测[M].北京:石油工业出版社, 2001:12~40, 255~265.
SONG Hui-zhen, JIA Cheng-zao, OUYANG Jian, et al.Theory and method of fracture-type reservoir research:Fracture prediction in carbonate rock reservoir in Tarim Basin[M].Beijing:Petroleum Industry Press, 2001:12~40, 255~265.
[11] 罗家洪.矩阵分析引论[M].广州:华南理工大学出版社, 2002:6~8.
LUO Jia-hong.Matrix analysis[M].Guangzhou:South China University of Technology Press, 2002:6~8.
[12] 周新桂, 操成杰, 袁嘉音.储层构造裂缝定量预测与油气渗流规律研究现状和进展[J].地球科学进展, 2003, 18(3):398~404. http://kns.cnki.net/KCMS/detail/detail.aspx?filename=dxjz200303011&dbname=CJFD&dbcode=CJFQ
ZHOU Xin-gui, CAO Cheng-jie, YUAN Jia-yin.The research actuality and major progresses on the quantitative forecast of reservoir fractures and hydrocarbon migration law[J].Advance in Earth Sciences, 2003, 18(3):398~404. http://kns.cnki.net/KCMS/detail/detail.aspx?filename=dxjz200303011&dbname=CJFD&dbcode=CJFQ
[13] 孙焕泉, 王加滢.地下构造裂缝分布规律及其预测[J].大庆石油学报, 2000, 24(3):82~84. http://kns.cnki.net/KCMS/detail/detail.aspx?filename=dqsy200003029&dbname=CJFD&dbcode=CJFQ
SUN Huan-quan, WANG Jia-ying.Distribution law of underground structural fissures and their forecasting[J].Journal of Daqing Petroleum Institute, 2000, 24(3):82~84. http://kns.cnki.net/KCMS/detail/detail.aspx?filename=dqsy200003029&dbname=CJFD&dbcode=CJFQ
-
图(5)
表(1)
计量
- 文章访问数: 963
- PDF下载数: 2
- 施引文献: 0