四川盆地凉高山组全尺寸孔隙半径分布表征方法

doi:10.7657/XJPG20250207

摘要/Abstract

摘要： 四川盆地下侏罗统凉高山组页岩储集层发育，孔隙为纳米级，具有低孔低渗、孔隙类型多样、孔隙结构复杂及孔隙半径分布范围广的特点，因此，准确评价页岩储集层孔隙结构对储集层评价和甜点区优选具有重要意义。综合扫描电镜、气体吸附和核磁共振实验资料，对凉高山组不同岩相的孔隙结构进行表征，研究N₂和CO₂吸附的孔隙半径分布计算模型，确定不同孔隙半径与横向弛豫时间的转换参数，即表面弛豫速率，实现不同岩相全尺寸孔隙半径表征，同时研究表面弛豫速率与矿物含量的关系。结果表明：表面弛豫速率与石英、斜长石和方解石含量成反比，表面弛豫速率与钾长石、菱铁矿和黏土矿物含量成正比；绿泥石、黄铁矿和菱铁矿属于顺磁性物质，随着顺磁性离子浓度增大，矿物磁化率增大，从而增大表面弛豫速率。

关键词: 四川盆地, 凉高山组, 孔隙结构, 核磁共振测井, 气体吸附, 孔隙半径分布, 表面弛豫速率

Abstract:

The shale reservoirs of Lower Jurassic Lianggaoshan formation in the Sichuan Basin are well-developed, with nanoscale pores. These reservoirs are characterized by low porosity, low permeability, diverse pore types, complex pore structures, and a wide range of pore radius distribution. Therefore, accurately evaluating pore structure of shale reservoirs is of great significance for reservoir evaluation and sweet spot prediction. Using the data from scanning electron microscopy (SEM), gas adsorption experiments, and nuclear magnetic resonance (NMR) experiments, the pore structures of different lithofacies in the Lianggaoshan formation were characterized. The calculation models for pore radius distribution based on N₂ and CO₂ adsorption were defined，and the surface relaxation rate, a conversion parameter between pore radius and transverse relaxation time, was determined to enable the characterization of full-size pore radius across lithofacies. And the relationship between surface relaxation rate and mineral contents was investigated. The results show that the surface relaxation rate is inversely proportional to the contents of quartz, plagioclase, and calcite, and directly proportional to the contents of potassium feldspar, siderite, and clay minerals. Chlorite, pyrite, and siderite are paramagnetic materials; as the concentration of paramagnetic ions increases, the magnetic susceptibility of these minerals increases, thereby enhancing the surface relaxation rate.

Key words: Sichuan Basin, Lianggaoshan formation, pore structure, NMR logging, gas adsorption, pore radius distribution, surface relaxation rate

中图分类号:

P631

赵吉儿, 冉崎, 谢冰, 赖强, 白利, 朱迅. 四川盆地凉高山组全尺寸孔隙半径分布表征方法[J]. 新疆石油地质, 2025, 46(2): 181-191.

ZHAO Ji’er, RAN Qi, XIE Bing, LAI Qiang, BAI Li, ZHU Xun. Characterization Method for Full-Size Pore Radius Distribution in Lianggaoshan Formation, Sichuan Basin[J]. Xinjiang Petroleum Geology, 2025, 46(2): 181-191.

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岩相	总孔体积/ （cm³·g^-1）	BET比表面积/ （m²·g^-1）	孔隙半径/ nm
粉砂岩相	0.003 3~0.011 7 （0.007 2）	1.32~6.39 （4.04）	6.01~9.97 （7.68）
泥质粉砂岩相	0.004 7~0.009 0 （0.006 7）	2.24~5.13 （3.38）	7.01~8.80 （8.06）
页岩相	0.004 5~0.009 7 （0.007 0）	1.20~4.10 （2.57）	8.41~17.48 （11.29）

岩相	吸附量/ （cm³·g^-1）	比表面积/ （m²·g^-1）	孔隙半径/ nm
粉砂岩相	0.33~0.88 （0.60）	2.49~6.73 （4.30）	0.31~0.42 （0.39）
泥质粉砂岩相	0.47~0.85 （0.65）	3.41~6.44 （4.87）	0.35~0.50 （0.40）
页岩相	0.63~1.01 （0.81）	4.71~7.72 （6.28）	0.42~0.51 （0.46）

岩相	孔隙半径为2 nm时对应T₂/ms	微孔表面弛豫速率/ （μm·ms^-1）	孔隙半径为50 nm时对应T₂/ms	介孔表面弛豫速率/ （μm·ms^-1）
粉砂岩相	0.16	0.013	0.80	0.021
泥质粉砂岩相	0.28	0.007	1.20	0.014
页岩相	0.23	0.009	1.20	0.014