以鄂尔多斯盆地某区域石盒子组致密砂岩气储层为例,研究了其饱和度测井评价方法。宏观上基于岩屑石英砂岩及岩屑砂岩,微观上基于残余粒间孔及溶蚀-粒间孔,结合岩样薄片显微分析资料、岩电试验资料以及网络模型数值模拟结果,分析获得致密气储层的导电规律:地层因素F、孔隙度φ与电阻率指数I、含水饱和度Sw的关系由于岩性及孔隙类型的不同而存在差异,岩屑砂岩因其岩屑成分及孔隙类型的复杂性,增加了岩石的导电难度,在同等条件下,地层因素及电阻率指数均高于岩屑石英砂岩;电阻率指数与含水饱和度呈现指数关系,而非Archie模型的乘幂关系。在此基础上,分类型建立了可变胶结指数(m)的改进Archie模型,并应用于石盒子组致密气储层饱和度测井评价,结果显示饱和度计算值的绝对误差小于5%,验证了该测井评价方法的实用性。
As a saturation logging evaluation problem, the conductance mechanism is studied with a tight gas reservoir in the Shihezi formation in Ordos Basin as an example, based macroscopically on the lithic quartz sandstone and the lithic sandstone, microscopically on the remnant intergranular pore and the corrosion intergranular pore, and combined with the thin section analysis data and the litho-electric experiment data. The relationships between the formation factor (F) and the porosity(φ), the resistivity index (I) and the water saturation (Sw)are affected by the lithology and the pore type. The conductance of the lithic sandstone is decreased because of the complexity of the mineral and pore type. Under the same condition, the formation factor and the resistivity index of the lithic sandstone are greater than those of the lithic quartz sandstone. The relationship between the resistivity index and the water saturation is exponential rather than as a specific power relation based on the numerical simulation of the network model. On the basis of the conductance mechanism, a modified Archie model of changeable cementation index is built for different lithologies and pore types. Applying the saturation model to this area, its practicability is confirmed.
[1] 孙建孟, 王克文, 李伟.测井饱和度解释模型发展及分析[J].石油勘探与开发, 2008, 35(1): 101-107.Sun Jianmeng, Wang Kewen, Li Wei.Development and analysis of logging saturation interpretation models[J].Petroleum Exploration and Development, 2008, 35(1): 101-107.
[2] 罗少成, 成志刚, 林伟川, 等.复杂孔隙结构储层变岩电参数饱和度模型研究[J].测井技术, 2015, 39(1): 43-47.Luo Shaocheng, Cheng Zhigang, Lin Weichuan, et al.Research on saturation model of variable rock-electric parameters for reservoirs with complicated pore structures[J].Well Logging Technology, 2015, 39(1): 43-47.
[3] Archie G E.The electrical resistivity log as an aid in determinging some reservoir characteristics[J].Transactions of the AIME, 1942, 146(1): 54-62.
[4] 中国石油勘探与生产分公司.低孔低渗油气藏测井技术及应用[M].北京: 石油工业出版社, 2009: 110-120.PetroChina Exploration & Production Company.Technique and application of low porosity and low permeability oil and gas reservoir [M].Beijing: Petroleum Industry Publishing House, 2009.
[5] 张龙海, 周灿灿, 刘国强, 等.孔隙结构对低孔低渗储集层电性及测井解释评价的影响[J].石油勘探与开发, 2006, 33(6): 671-676.Zhang Longhai, Zhou Cancan, Liu Guoqiang, et al.Influence of pore structures on electric properties and well logging evaluation in low porosity and permeability reservoirs[J].Petroleum Exploration and Development, 2006, 33(6): 671-676.
[6] 孙小平, 石玉江, 姜英昆.复杂孔隙结构储层含气饱和度评价方法[J].天然气工业, 2000, 20(3): 41-44.Sun Xiaoping, Shi Yujiang, Jiang Yingkun.Method of evaluating gas saturation in the reservoir with complicated pore structures[J].Natural Gas Industry, 2000, 20(3): 41-44.
[7] Glover P W J.A generalized Archie's law for n-phases[J].Geophysics, 2010, 75(6): E247-E265.
[8] Chen X, Kuang L C, Sun Z C.Archie parameter determination by analysis of saturation data[J].Petrophysics, 2002, 43(2): 103-107.
[9] Haro C.The equations archie forgot: Anisotropy of the rocks[C].Society of Petroleum Engineers, Annual Technical Conference and Exhibition, New Orleans, France, October 4-7, 2009.
[10] Montaron B.Connectivity theory-a new approach to modeling nonArchie rocks[J].Petrophysics, 2009, 50(2): 102-115.
[11] Kumar M, Senden T J, Sheppard A P.Probing the Archie's exponent under variable saturation conditions[J].Petrophysics, 2011, 52(2): 124-134.
[12] 曾文冲.油气藏储集层测井评价技术[M].北京: 石油工业出版社, 1991: 92-134.Zeng Wenchong.Logging evaluation technology for hydrocarbon reservoir[M].Beijing: Petroleum Industry Press, 1991: 92-134.
[13] 王黎, 孙宝佃, 沈爱新, 等.某油田低孔隙度低渗透率泥质砂岩储层岩电实验及应用[J].测井技术, 2005, 29(2): 91-94.Wang Li, Sun Baodian, Shen Aixin, et al.On application of rock electricity parameters of shaly sand reservoir with low-porosity and permeability, X field[J].Well Logging Technology, 2005, 29(2): 91-94.
[14] 李霞, 赵文智, 周灿灿, 等.低孔低渗碎屑岩储集层双孔隙饱和度模型[J].石油勘探与开发, 2012, 39(1): 82-91.Li Xia, Zhao Wenzhi, Zhou Cancan, et al.Dual-porosity saturation model of low-porosity and low-permeability clastic reservoirs[J].Petroleum Exploration and Development, 2012, 39(1): 82-91.
[15] 陈玉凤, 李栋梁, 梁德青, 等.南海沉积物天然气水合物饱和度与电阻率的关系[J].石油学报, 2013, 34(3): 504-512.Chen Yufeng, Li Dongliang, Liang Deqing, et al.Relationship between gas hydrate saturation and resistivity in sediments of the South China Sea[J].Acta Petrolei Sinica, 2013, 34(3): 504-512.
[16] 岳文正, 陶果.饱和多相流体岩石导电规律的数值实验[J].中国科学: 地球科学, 2008, 39(1): 154-160.Yue Wenzheng, Tao Guo.Numerical simulation of electrical properties of rock saturated with multiphase fluids[J].Science in China: Earth Sciences, 2008, 39(1): 154-160.
[17] Wang Y M, Sharma M M.A network model for the resistivity behavior of partially saturated rocks[C].The Society of Petrophysicists and Well Log Analysts 29th Annual Logging Symposium Transactions, San Antonio, Germany, June 5-8, 1988.
[18] Fleury M, Boyd D.Water saturation from NMR, resistivity and oil base core in a heterogeneous middle east carbonate reservoir[J].Petrophysics, 2006, 47(1): 60-73.
