基于压汞法的彬长矿区直罗组砂岩孔喉分区
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摘要
为研究彬长矿区直罗组砂岩的孔喉大小及占比特征,通过压汞实验的方法研究了进汞压力对应的不同孔喉大小和分布,用以划分出不同孔喉区间、定量化描述孔喉占孔隙体积的百分比。结果表明:彬长矿区直罗组砂岩孔喉较发育,数量多,连通性好,但在垂向上的均质性较差,大孔喉占孔喉体积的0.69%,中孔喉占孔喉体积的34.43%,小孔喉及微孔喉分别占孔喉体积的38.68%、24.91%;中、小孔喉占孔隙体积的73.11%,是砂岩含水层主要的渗流通道,在很大程度上决定着砂岩的渗透率。
In order to study the size and proportion of the pore throats in Zhiluo formation sandstone in Binchang Mining Area, the size and distribution of different pore throats corresponding to mercury injection pressure were studied by means of mercury injection test, which were used to divide different pore throats intervals and quantitatively describe the percentage of pore throats to pore volume. The results show that the sandstone pore throats in Zhiluo formation are more developed, more in quantity and better in connectivity, but the vertical homogeneity is poor. The macro pore throats accounted for 0.69% of the pore volume, meso pore throats accounted for 34.43% of the pore volume, and pore throats and micro pore throats accounted for 38.68% and 24.91%of the pore volume, respectively. As the main seepage channel of sandstone aquifer, medium and small pore throat, which accounts for 73.11% of pore volume, largely determines the permeability of sandstone.
In order to study the size and proportion of the pore throats in Zhiluo formation sandstone in Binchang Mining Area, the size and distribution of different pore throats corresponding to mercury injection pressure were studied by means of mercury injection test, which were used to divide different pore throats intervals and quantitatively describe the percentage of pore throats to pore volume. The results show that the sandstone pore throats in Zhiluo formation are more developed, more in quantity and better in connectivity, but the vertical homogeneity is poor. The macro pore throats accounted for 0.69% of the pore volume, meso pore throats accounted for 34.43% of the pore volume, and pore throats and micro pore throats accounted for 38.68% and 24.91%of the pore volume, respectively. As the main seepage channel of sandstone aquifer, medium and small pore throat, which accounts for 73.11% of pore volume, largely determines the permeability of sandstone.
引文
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[15]李海燕,岳大力,张秀娟.苏里格气田低渗透储层微观孔隙结构特征及其分类评价方法[J].地学前缘,2012,19(2):133-140.
[2]吴浩,刘锐娥,纪友亮,等.致密气储层孔喉分形特征及其与渗流的关系—以鄂尔多斯盆地下石盒子组盒8段为例[J].沉积学报,2017,35(1):151-162.
[3]白斌,朱如凯,吴松涛,等.非常规油气致密储层微观孔喉结构表征新技术及意义[J].中国石油勘探,2014,19(3):78-86.
[4]伍岳,樊太亮,蒋恕,等.海相页岩储层微观孔隙体系表征技术及分类方案[J].地质科技情报,2014,33(4):91-97.
[5] Gareth R C, Bustin R M, Power I M. Characterization of gasshale pore systems by porosimetry, pycnometry,surface area, and field emission scanning electron microscopy transmission electron microscopy image analyses:Examples from the Barnett, Woodford, Haynesville,Marcellus, and Doig units[J]. AAPG Bulletin, 2012, 96(6):1099-1119.
[6]蒋裕强,陈林,蒋婵,等.致密储层孔隙结构表征技术及发展趋势[J].地质科技情报,2014,33(3):63-70.
[7]白斌,朱如凯,吴松涛,等.利用多尺度CT成像表征致密砂岩微观孔喉结构[J].石油勘探与开发,2013,40(3):329-333.
[8]吴浩,郭英海,张春林,等.致密油储层微观孔吼结构特征及分类—以鄂尔多斯盆地陇东地区三叠统延长组长7段为例[J].东北石油大学学报,2013,37(6):12-17.
[9]赵继勇,刘振旺,谢启超,等.鄂尔多斯盆地姬塬油田长7致密油储层微观孔喉结构分类特征[J].中国石油勘探,2014,19(5):73-79.
[10]代全齐,罗群,张晨,等.基于核磁共振新参数的致密油砂岩储层孔隙结构特征—以鄂尔多斯盆地延长组7段为例[J].石油学报,2016,37(7):887-897.
[11] Alyafei N, Mckay T J, Solling T I. Characterization of petrophysical properties using pore-network and lattice-Boltzmann modelling:choice of method and image sub-volume size[J]. Journal of Petroleum Science and Engineering, 2016, 145:256-265.
[12] Loucks R G, Reed R M, Ruppel S C, et al. Morphology, genesis,and distribution of nanometer-scale pores in siliceousmudstones of the Mississippian Barnett shale[J]. Journal of Sedimentary Research, 2009, 79(12):848-861.
[13] Clarkson C R, Solano N, Bustin R M, et al. Pore structure characterization of North American shale gas reservoirs using USANS/SANS, gas adsorption, and mercury intrusion[J]. Fuel, 2013, 103:606-616.
[14]何顺利,焦春艳,王建国,等.恒速压汞与常规压汞的异同[J].断块油气田,2011,18(2):235-237.
[15]李海燕,岳大力,张秀娟.苏里格气田低渗透储层微观孔隙结构特征及其分类评价方法[J].地学前缘,2012,19(2):133-140.
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