陆相页岩油储层微观孔喉结构表征与含油性分级评价

doi:10.11743/ogg20220112

Abstract

Abstract:

In view of the diverse types of shale oil reservoirs and great difficulty in sweet-spot prediction in the Lucaogou Formation， analysis on the mechanism influencing shale oil pore development and evaluation on oil-bearing properties， are supposed to be carried out. To this end， this study focuses on the microscopic pore structure of shale oil reservoirs in the Permian Lucaogou Formation， Jimsar Sag， through an integration of core observation， scanning electron microscopy （SEM）， mercury intrusion porosimetry （MIP） and nuclear magnetic resonance （NMR）， etc. As a result， the influential mechanism is disclosed and classification criteria for reservoir evaluation are set up. The results show that there are five types of reservoirs developed in the Lucaogou Formation： reservoirs of intergranular pore type， of intergranular-dissolved-intercrystalline pore type， of dissolved pore type， of dissolved-intercrystalline pore type and of intercrystalline pore type. Among others， reservoirs of intergranular pore type and dissolved pore type are the best in terms of physical property and mobility， and those of intergranular pore type are the worst. Second， larger amount of coarser grains， proper dolomite content and low level of cement， serve to jointly determine the formation of high-quality reservoirs， the distribution of which is controlled by near distance to provenance， high-energy environment and paleo-sag. Third， the oil-bearing property of source-reservoir alternating or integrated source-reservoir configurations is better than that of near-source thick reservoir type， with a pore throat of 15 nm and 70 nm as a boundary to determine whether the Lucaogou Formation contains oil and whether the reservoir has good oil-bearing property， respectively. Fourth， as guided by the correlation between pore throat structure and oil-bearing property， three types of oil layers （i.e.， Class Ⅰ， Class Ⅱ and Class Ⅲ） are identified. The second interval of the first member of Lucaogou Formation （Lu 1 Member） is characterized by well-developed reservoirs of high quality， good source-reservoir configuration， and large-scale distribution of sweet spots within. The research results are of a geological basis for the classification， evaluation and prediction of shale oil reservoirs in the Lucaogou Formation.

Key words: microscopic pore structure, mechanism affecting pore development, oil layer classification, shale oil reservoir, Lucaogou Formation, Jimsar Sag, Junggar Basin

CLC Number:

TE122.2

Linsheng Wang, Yiping Ye, Jianhua Qin, Yang Gao, Yuan Deng, Yingyan Li, Dianshi Xiao. Microscopic pore structure characterization and oil-bearing property evaluation of lacustrine shale reservoir： A case study of the Permian Lucaogou Formation in Jimsar Sag， Junggar Basin[J]. Oil & Gas Geology, 2022, 43(1): 149-160.

Figures/Tables 12

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Table 1

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样品编号	含油级别	薄片鉴定岩性	孔隙度/%	渗透率/（10^-3 μm²）	孔喉组合类型	全岩矿物含量/ %					可动饱和度/ %
样品编号	含油级别	薄片鉴定岩性	孔隙度/%	渗透率/（10^-3 μm²）	孔喉组合类型	石英	长石	白云石	方解石	粘土	可动饱和度/ %
5?H	荧光	泥岩	5.5	0.577 0	E	28.6	53.5	1.5	1.2	15.2	20.50
13?H	荧光	白云质泥岩	6.9	0.055 9	E	—	—	—	—	—	13.83
17?H	荧光	白云质泥岩	6.1	0.009 4	E	20.6	32.7	40.8	0	5.7	17.54
3	荧光	泥晶白云岩	4.3	0.003 0	E	29.3	43.3	12.9	4.7	7.6	44.13
J43?95	油迹	灰质粉砂岩	5.6	0.008 5	D	9.4	49.7	1.5	36.3	3.1	22.69
13	油迹	含灰粉砂岩	5.1	0.011 9	D	14.1	53.2	6.5	21.2	3.3	36.89
10	油斑	泥岩	11.9	0.027 7	D	40.2	35.7	11.1	0	13.0	38.60
24	油斑	泥质粉砂岩	8.9	0.139 5	D	16.3	51.1	7.8	10.1	12.3	42.56
3?H	油斑	粉砂质泥岩	14.7	0.061 8	C	37.5	48.0	2.6	3.8	5.2	37.90
39	油浸	粉砂质白云岩	14.9	0.046 9	B	6.4	5.3	88.3	0	0	54.80
2?H	油浸	细粒粉砂岩	14.3	0.083 3	A	28.5	67.0	0	0	3.7	59.89
15?H	油浸	含灰泥质粉砂岩	9.4	0.019 7	B	21.0	56.7	0	18.7	3.1	43.24
9?H	富含油	云屑砂岩	14.0	0.289 0	A	12.0	74.2	2.4	9.8	1.6	70.20
32	富含油	细粒粉砂岩	15.6	0.107 5	C	22.1	59.2	5.1	0	6.4	69.80
10?H	富含油	云屑砂岩	13.7	0.275 0	A	12.0	73.2	2.4	9.8	1.6	69.15
12?H	富含油	砂屑云岩	14.6	1.320 0	A	4.5	29.2	40.4	24.2	1.7	77.32

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Microscopic pore structure characterization and oil-bearing property evaluation of lacustrine shale reservoir： A case study of the Permian Lucaogou Formation in Jimsar Sag， Junggar Basin

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