岩相对于湖相页岩孔隙结构特征及孔隙演化的控制机理

doi:10.11743/ogg20250211

Abstract

Abstract:

Lacustrine shales typically exhibit distinct mineral-pore network frameworks for diverse lithofacies， significantly influencing the formation and evolution of primary and secondary pores in the shales. Based on data from whole-rock analysis by X-ray diffraction （XRD） mineralogy， total organic carbon （TOC） content analysis， scanning electron microscopy （SEM）， and N₂ adsorption experiments， we examine shale samples from the Jurassic Da’anzhai Member in cored wells LA1， RA1， and G10 in the central Sichuan Basin. To be specific， we investigate the petrological characteristics of these shale samples， as well as the characteristics and evolutionary mechanisms of their pore structures. The results indicate that the shales in the Da’anzhai Member can be categorized into seven lithofacies types： organic-lean limestone silty shale （OLLS）， organic-moderate limestone silty shale （OMLS）， organic-moderate limestone clay shale （OMLC）， organic-moderate silty clay shale （OMSC）， organic-rich silty clay shale （ORSC）， organic-lean argillaceous shale （OLAS） and organic-moderate argillaceous shale （OMAS）. Reserving spaces in these shales are dominated by intercrystalline pores in clay minerals. The OLLS exhibits well-developed intergranular pores among brittle grains， characterized by relatively low pore volume and specific surface area. In contrast， the OMAS and OLAS contain the most developed intercrystalline pores in clay minerals， featuring the highest pore volume and specific surface area. The clay-mineral intercrystalline pore diameters and the pore volumes of organic matter and clay minerals are significantly influenced by the compositions of detrital and clay minerals. Shales with a detrital mineral content of less than 25 % manifest a relatively high total pore volume due to the elevated pore volume of high-content clay minerals. For shales with a detrital mineral content of 25 % and above， the TOC content varies greatly despite the high pore volume of organic matter. As a result， the total pore volume of these shales is jointly affected by organic matter and inorganic minerals. The evolution of the mineral-pore network frameworks indicates that organic matter and mineral components govern the occurrence and intensity of diagenetic events， leading to diverse evolutionary characteristics of the pore structures and pore network frameworks across various lithofacies at present.

Key words: mineral-pore framework, reservoir space, lithofacies, pore structure, lacustrine shale, Da’anzhai Member, Sichuan Basin

CLC Number:

TE122.2

Jiahao KANG, Xingzhi WANG, Deming ZENG, Zisang HUANG, Yiqing ZHU, Bo LI, Shengyang XIE, Rui ZHANG. Effects of lithofacies on pore structure characteristics and evolution of lacustrine shales： A case study of the Jurassic Da’anzhai Member， central Sichuan Basin[J]. Oil & Gas Geology, 2025, 46(2): 491-509.

Figures/Tables 15

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样品编号	深度/m	TOC/%	矿物组分含量/%						孔隙比表面积/（cm²/g）	孔隙体积/ （cm³/g）	岩相
样品编号	深度/m	TOC/%	石英	方解石	白云石	黄铁矿	长石	黏土矿物	孔隙比表面积/（cm²/g）	孔隙体积/ （cm³/g）	岩相
LA1-01	3 499.30	1.75	33.10	34.00	0.80	2.60	1.00	28.50	2.71	0.009 592	OMLS
LA1-02	3 500.00	0.88	22.00	19.00	0	1.80	2.00	55.20	3.77	0.016 280	OLAS
LA1-03	3 503.00	1.78	30.00	33.20	2.00	1.50	1.20	32.10	3.67	0.013 330	OMLC
LA1-04	3 505.02	2.40	24.30	20.90	3.20	1.60	7.00	43.00	3.35	0.012 580	ORSC
LA1-05	3 508.20	1.74	20.20	35.00	0	1.20	1.00	42.60	1.89	0.008 353	OMLC
LA1-06	3 509.20	1.71	24.30	28.70	0	1.00	4.00	42.00	3.39	0.012 370	OMLC
LA1-07	3 510.97	1.62	19.00	31.00	6.00	3.00	3.90	37.10	2.50	0.010 400	OMLC
LA1-09	3 521.10	0.66	27.50	45.00	0	2.00	3.50	22.00	1.32	0.005 092	OLLS
LA1-10	3 526.85	0.51	28.30	46.30	0	0.50	2.20	22.70	1.99	0.006 451	OLLS
LA1-11	3 532.15	1.28	14.00	48.00	1.10	3.10	2.00	31.80	0.73	0.002 514	OMLC
LA1-12	3 535.20	0.70	32.00	40.80	0	0.70	2.20	24.30	1.61	0.006 182	OLLS
LA1-13	3 527.46	1.10	43.10	15.10	0	2.20	4.30	34.50	1.89	0.011 640	OMSC
LA1-14	3 528.40	1.40	32.60	20.20	0	1.30	4.10	41.00	2.93	0.010 687	OMSC
LA1-15	3 532.10	1.21	24.10	19.00	0.10	2.40	1.00	52.40	4.98	0.017 800	OMAS

w（Q+F）/ %	岩相	样品编号	深度/m	孔隙比表面积/（cm²/g）	孔隙体积/ （cm³/g）	估计孔隙比表面积/（cm²/g）		估计孔隙体积/（cm³/g）
w（Q+F）/ %	岩相	样品编号	深度/m	孔隙比表面积/（cm²/g）	孔隙体积/ （cm³/g）	有机质	黏土矿物	有机质	碎屑矿物	黏土矿物
<25	OLAS	LA1-02	3 500.00	3.77	0.016 280	0.37	3.92	0.001 686	—	0.015 271
	OMAS	LA1-15	3 532.10	4.98	0.017 800	0.51	3.64	0.002 319	—	0.014 179
	OMLC	LA1-05	3 508.20	1.89	0.008 353	0.74	1.98	0.003 334	—	0.007 629
	OMLC	LA1-07	3 510.97	2.50	0.010 400	0.69	1.14	0.003 104	—	0.004 293
	OMLC	LA1-11	3 532.15	0.73	0.002 514	0.54	0.32	0.002 453	—	0.001 078
≥25	OLLS	LA1-09	3 521.10	1.32	0.005 092	0.64	0.42	0.001 849	0.003 392	0.003 078
	OLLS	LA1-10	3 526.85	1.99	0.006 451	0.50	0.43	0.001 429	0.003 338	0.003 175
	OLLS	LA1-12	3 535.20	1.61	0.006 182	0.68	0.46	0.001 961	0.003 743	0.003 399
	OMLS	LA1-01	3 499.30	2.71	0.009 592	1.71	0.54	0.004 902	0.003 732	0.003 987
	OMLC	LA1-03	3 503.00	3.67	0.013 330	1.74	0.61	0.004 986	0.003 414	0.004 490
	OMLC	LA1-06	3 509.20	3.39	0.012 370	1.67	0.80	0.004 790	0.003 097	0.005 875
	OMSC	LA1-13	3 527.46	1.89	0.011 640	1.07	0.65	0.003 081	0.005 187	0.004 826
	OMSC	LA1-14	3 528.40	2.93	0.010 687	1.37	0.78	0.003 922	0.004 016	0.005 735
	ORSC	LA1-04	3 505.02	3.35	0.012 580	2.35	0.82	0.006 723	0.003 425	0.006 015

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Effects of lithofacies on pore structure characteristics and evolution of lacustrine shales： A case study of the Jurassic Da’anzhai Member， central Sichuan Basin

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