鄂尔多斯盆地延长探区长7油层组泥页岩孔隙结构定量表征与动态演化过程

doi:10.11743/ogg20230204

Abstract

Abstract:

Quantitative characterization and dynamic evolution study of full-scale structure provides an important basis for understanding the forming mechanism of shale reservoirs and clarifying the relationship between pores and hydrocarbon-rock interactions. Using field emission scanning electron microscopy integrated with high-pressure mercury intrusion as well as N₂ and CO₂ adsorption experiments， representative core plugs of different maturity and corresponding samples subjected to hydrocarbon generation and expulsion simulation experiments from Chang 7 oil layer group in the Yanchang area， Ordos Basin， were quantitively characterized for their full-scale structure. Furthermore， combined with hydrocarbon generation and expulsion simulation and X-ray diffraction test results of whole rock/clay mineral content， the interaction of organic hydrocarbon generation and expulsion， mineral diagenesis and pore structure evolution was studied， and the dynamic evolution of reservoir pore structure and fractal characteristics was quantitatively analyzed. The results show that the micropores， small pores and mesopores in shale reservoirs of the Chang 7 oil layer group contribute more to the pore volume， while the micropores and small pores provide most pore specific surface area. With hydrocarbon generation and expulsion of organic matter， dissolution of inorganic minerals and transformation between minerals， the total pore volume first decreases and then increases， and the proportion of meso-macropores decreases first and then increases， and the heterogeneity of micro-small pores is generally enhanced， while the heterogeneity of meso-macropores has a trend of increasing first and then decreasing. The correlation analysis reveals that the pore size and mineral composition are coupled with the heterogeneity of the reservoir， in which the fractal dimension D₁ value of micro-small pores is positively correlated with the proportion of micropores to micro-small pores and the content of clay minerals， while the fractal dimension D₂ value of meso-macropores is negatively correlated with the proportion of macropores to meso-macropores， and positively correlated with the content of brittle minerals. This study provides an accurate determination of the full-scale structure and evolution of the shale in Chang 7 oil layer group， which is of great significance for identifying sweet spots in shale reservoirs of terrestrial facies.

Key words: pore structure, dynamic evolution, fractal dimension, gas adsorption, quantitative description, shale oil, Yanchang Formation, Ordos Basin

CLC Number:

TE122.2

Jing XU, Yunjin GE, Yonghong HE, Renhai PU, Linyu LIU, Liang DUAN, Kefeng DU. Quantitative characterization and dynamic evolution of pore structure in shale reservoirs of Chang 7 oil layer group in Yanchang area， Ordos Basin[J]. Oil & Gas Geology, 2023, 44(2): 292-307.

Figures/Tables 15

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样品号	采集深度/m	TOC/%	R_o/%	主要矿物组分含量/%
样品号	采集深度/m	TOC/%	R_o/%	石英	黏土矿物	钾长石	斜长石	云母	方解石	（铁）白云石	黄铁矿	菱铁矿
L237	1 176.9	3.96	0.55	24.4	32.7	7.9	14.8	1.3	8.6	5.0	3.8	1.5
L217	1 379.7	5.33	0.74	39.0	26.2	5.6	24.2	0.9	0.0	1.6	1.1	1.4
X6009	1 410.0	3.48	0.82	21.8	18.2	14.4	40.5	0.6	1.8	1.7	0.0	1.0
Y1011	1 747.0	5.78	0.56	24.2	36.1	9.7	11.5	0.0	3.1	2.5	9.7	3.2
ZC10-6	2 078.0	5.15	0.89	34.7	35.0	4.2	15.3	2.1	2.4	2.1	2.5	1.7
D6498	2 230.5	1.75	0.99	51.4	18.9	4.1	22.7	1.7	1.2	0.0	0.0	0.0
D48031	2 496.0	6.54	1.05	24.7	31.0	3.6	10.1	0.0	1.6	1.5	25.8	1.7

实验温度/℃	TOC/%	R_o/%	主要矿物组分含量/%
实验温度/℃	TOC/%	R_o/%	石英	黏土矿物	钾长石	斜长石	方解石	黄铁矿
原样	1.99	0.67	34.1	20.2	16.0	24.1	2.9	2.7
300	1.97	0.86	34.3	22.2	12.4	25.7	2.8	2.6
320	1.98	0.94	35.0	22.9	13.0	24.1	2.6	2.5
340	1.93	1.00	29.1	25.6	12.6	27.9	2.3	2.4
370	1.66	1.15	31.5	25.0	10.6	28.0	2.4	2.5
420	1.63	1.79	32.9	28.5	10.0	24.5	2.1	2.0

样品号（原样）	微-小孔		中-大孔		实验温度/℃	微-小孔		中-大孔
样品号（原样）	D₁	相关系数R²	D₂	相关系数R²	实验温度/℃	D₁	相关系数R²	D₂	相关系数R²
L237	2.452	0.998 5	2.984	0.994 4	C171原样	2.529	0.991 3	2.982	0.985 0
Y1011	2.404	0.982 5	2.969	0.921 6	300	2.522	0.996 5	2.952	0.971 3
L217	2.415	0.994 8	2.985	0.975 3	320	2.530	0.996 3	2.962	0.947 2
X6009	2.483	0.981 2	2.969	0.957 7	340	2.543	0.992 0	2.894	0.994 1
ZC10-6	2.349	0.990 4	2.984	0.993 6	370	2.564	0.993 5	2.899	0.964 3
D6498	2.482	0.996 5	2.982	0.994 6	420	2.597	0.992 1	2.818	0.892 2
D48031	2.480	0.997 2	2.985	0.972 2	—	—	—	—	—
平均值	2.438	0.991 6	2.980	0.972 8	平均值	2.547	0.993 6	2.918	0.959 0

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Quantitative characterization and dynamic evolution of pore structure in shale reservoirs of Chang 7 oil layer group in Yanchang area， Ordos Basin

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