Micropore structure and physical property of geothermal reservoir of Wumishan Formation in Beijing area
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摘要:
以北京地区中元古界蓟县系雾迷山组碳酸盐岩地热储层为研究对象，通过扫描电镜(SEM)和薄片鉴定，划分了样品微观孔隙类型，借助MATLAB图像处理技术，定量化表征微裂缝密度和尺寸发育特征; 联合毛管力测试与低温液氮吸附实验，定量化雾迷山组白云岩微-介-宏孔体积分布; 分析宏观孔渗测试结果，认为微裂缝越发育、透气孔越多、孔喉均质性越好，孔渗越大的微观-宏观作用规律，并拟合了孔渗经验关系式; 建立了基于测井资料划分有利开发层段的方法。雾迷山组白云岩基质孔隙连通性较差，微裂隙与溶蚀孔洞提供了主要渗流通道; 整体孔隙分布频率随孔径整体呈正态分布，最可能几率孔径分布于50~60 nm。研究成果可为华北地区雾迷山组地热资源开发提供基础数据支撑。
Abstract:Taking the carbonate geothermal reservoir in Wumishan Formation of Mesoproterozoic Jixian System in Beijing as the research object, the micro-pore types of samples are classified with SEM visualization and slice identification, and the density and size development characteristics of micro fractures are quantified with the help of MATLAB image processing technology.The micro-medium-macro pore volume distribution of dolomite in Wumishan Formation is quantified by combining capillary force test and low-temperature liquid nitrogen adsorption experiment.Based on the macro porosity and permeability test results, the analysis concluded that the more developed microfractures, the more gas permeable pores and the better pore throat homogeneity, the greater the influence law of porosity and permeability, and the empirical relationship between porosity and permeability is fitted.Finally, a method of dividing favorable development intervals based on logging data is established.The results show that the connectivity of matrix pores of dolomite in Wumishan Formation is poor, and micro fractures and dissolution pores provide the main seepage channels.The overall pore distribution frequency is normally distributed with the pore size, which distributes at 50~60 nm most likely.The research results can provide basic data support for the development of geothermal resources in the Wuzhishan Formation in North China.
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表 1 实验样品编号及坐标
Table 1. Number and coordinates of the experimental samples
取样编号 经度 纬度 取样编号 经度 纬度 Jxw4-1 E117° 23′ 24.9″ N40° 06′ 47.0″ Jxw3-2 E117°24′ 23.2″ N40°06′ 57.6″ Jxw4-2 E117° 23′ 33.0″ N40° 06′ 52.5″ Jxw3-3 E117°24′ 21.5″ N40°07′ 03.3″ Jxw4-3 E117° 23′ 35.2″ N40° 06′ 52.2″ Jxw3-4 E117°24′ 24.4″ N40°07′ 04.9″ Jxw4-4 E117° 23′ 42.4″ N40° 06′ 50.9″ Jxw3-5 E117°24′ 29.7″ N40°07′ 15.0″ Jxw4-5 E117° 23′ 44.1″ N40° 06′ 51.4″ Jxw2-1 E117°24′ 25.79″ N40°07′ 18.92″ Jxw4-6 E117° 23′ 51.8″ N40° 06′ 51.4″ Jxw2-2 E117°24′ 36.11″ N40°07′ 25.43″ Jxw4-7 E117° 24′ 00.0″ N40° 06′ 52.4″ Jxw2-3 E117°24′ 41.86″ N40°07′ 38.06″ Jxw3-1 E117°24′ 14.7″ N40°06′ 59.1″ Jxw1-1 E117°24′ 44.00″ N40°07′ 57.62″ 
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表 2 雾迷山组白云岩孔隙度、渗透率测试结果
Table 2. Porosity and permeability test results of dolomite in the Wumishan Formation
样品编号 峰值个数 峰值孔径/nm 对应孔隙体积/cm3 孔隙度/% 渗透率/mD Jxw4-1 1 64.73 0.089 9.1 5.12 Jxw4-2 2 15.05 0.011 0.8 0.0047 35.72 0.010 Jxw4-3 1 42.84 0.025 1.3 0.0341 Jxw4-4 2 3.75 0.007 1.3 0.05 52.02 0.052 Jxw4-5 1 37.20 0.028 2 0.6919 Jxw4-6 1 46.44 0.032 10.6 0.0146 Jxw4-7 1 137.82 0.298 8.4 26.3 Jxw3-1 1 64.74 0.021 1.1 0.0136 Jxw3-2 1 37.05 0.012 0.8 0.01 Jxw3-3 1 35.30 0.015 0.5 0.0111 Jxw3-4 3 4.14 0.019 9.5 0.029 64.74 0.132 316.99 0.100 Jxw3-5 1 64.73 0.010 0.5 2.86 Jxw2-1 3 15.05 0.043 8.6 0.0624 28.22 0.064 64.74 0.029 Jxw2-2 5 15.05 0.012 4.5 0.1137 28.22 0.014 64.73 0.017 137.87 0.037 317.12 0.012 Jxw2-3 5 7.20 0.010 3.6 1.62 14.56 0.031 18.35 0.014 46.97 0.004 196.08 0.007 Jxw1-1 5 9.11 0.014 1.8 0.0937 22.00 0.021 47.64 0.064 126.74 0.026 317.66 0.041
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