页岩油储层混合细粒沉积孔喉特征及其对物性的控制作用

doi:10.11743/ogg20220515

Abstract

Abstract:

Major breakthroughs have been made in recent years in shale oil exploration in the Permian Lucaogou Formation of the Jimsar Sag， Junggar Basin， which has become an important target for the exploration and development of continental shale oil reservoirs. An integration of cast thin sections， trace elements， SEM (scanning electron microscopy)， micron and nanometer CT imaging， PMI (pressure-controlled mercury injection) and RMI (rate-controlled mercury injection) was applied to study the pore throat structure of the fine-grained mixed (silisiclastic-carbonate) deposits in the Lucaogou Formation of saline lacustrine basin facies and its control on porosity and permeability of reservoirs. The results suggest that the dolomitic siltstone， silty dolomite and dolomicrite are of the best lithologic types in sweet spots. Micro-/nano-scale pore throat systems take a dominant position in reservoir space， with a pore throat radius ranging from hundreds of micrometers to tens of nanometers. Micro- to sub-micro-scale pore throats make the greatest contribution to permeability with the main throat radius ranging from 0.25 μm to 0.63 μm. The structure of micro- to nano-scale pore throats controls the permeability and oil content. The dominant lithologic types have larger peak values and wider distribution of pore throat radius. Besides， the distribution of throat radius， mainstream throat radius and volume of effective throat volume are the key factors controlling reservoir permeability. These understandings act as important geological supports for reservoir hydrocarbon charging prediction and well deployment in dominant sedimentary facies zones.

Key words: pore throat structure, reservoir quality, mixed silisiclastic?carbonate deposits, continental shale oil, Lucaogou Formation, Jimsar Sag, Junggar Basin

CLC Number:

TE122.2

Ke Ma, Jiagen Hou, Hu Dong, Guoqiang Wu, Lin Yan, Liwei Zhang. Pore throat characteristics of fine-grained mixed deposits in shale oil reservoirs and their control on reservoir physical properties： A case study of the Permian Lucaogou Formation， Jimsar Sag， Junggar Basin[J]. Oil & Gas Geology, 2022, 43(5): 1194-1205.

Figures/Tables 10

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地层	岩性	样品号	孔隙度/%	渗透率/（10^-3μm²）	主要矿物含量/%		最大连通孔喉半径/μm	中值半径/ μm	排驱压力/ MPa	退汞效率/ %
地层	岩性	样品号	孔隙度/%	渗透率/（10^-3μm²）	白云石	石英+长石	最大连通孔喉半径/μm	中值半径/ μm	排驱压力/ MPa	退汞效率/ %
上甜点体	白云质粉砂岩	DS-1	17.4	1.100	23.7	62.5	0.519	0.112	1.323	30.190
	白云质粉砂岩	DS-2	6.9	0.015	18.9	74.8	0.233	0.077	3.822	22.003
	粉砂质白云岩	SD-1	15.1	0.113	71.3	17.6	0.870	0.106	2.104	27.148
	粉砂质白云岩	SD-2	12.7	0.023	65.8	22.1	0.359	0.063	2.566	25.332
	砂屑白云岩	D-1	7.1	0.017	89.6	7.8	0.753	0.055	3.771	22.969
下甜点体	白云质粉砂岩	DS-3	8.3	0.011	16.5	67.7	0.464	0.071	3.655	23.010
下甜点体	白云质粉砂岩	DS-4	4.1	0.008	26.9	62.8	0.257	0.051	4.126	20.202

岩性	孔隙数量/个			孔隙体积/（10⁶ μm³）			喉道数量/个			喉道体积/（10⁶ μm³）
岩性	最大	最小	平均	最大	最小	平均	最大	最小	平均	最大	最小	平均
粉砂岩类	21 214	3 146	12 651	28.0	1.2	15.1	21 187	9 181	13 045	2.77	0.62	2.10
白云岩类	16 394	7 130	11 762	9.8	4.6	7.2	17 606	8 368	12 987	3.08	0.64	1.86

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Pore throat characteristics of fine-grained mixed deposits in shale oil reservoirs and their control on reservoir physical properties： A case study of the Permian Lucaogou Formation， Jimsar Sag， Junggar Basin

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