陆相页岩油储层可动油含量测井评价方法

doi:10.11743/ogg20240317

Abstract

Abstract:

Recent years have witnessed significant progress in the exploration and exploitation of shale oil in continental basins in East China. However， the assessment of shale oil productivity is largely hindered by the evaluation of oil mobility. By investigating the shale oil in the Subei Basin， we propose two well-log-based methods for assessing the movable oil content in shales： the two-dimensional nuclear magnetic resonance （2D NMR） method and the conventional logging. An identification plot for movable oil is thereby established using the 2D NMR-derived longitudinal and transverse relaxation time （T₁ and T₂， respectively）， acting to assess fluid types like adsorbed oil and irreducible water. By exploring the relationships of free hydrocarbon content （S₁） with sedimentary environments and structures， along with the correlation between S₁ and logging responses， we analyze the response sensitivities of conventional well-log-derived resistivity and sonic interval transit time to S₁ and organic matter content， and establish a well-log-based quantitative assessment model for S₁. Furthermore， a method for assessing S₁ using log data is developed to calculate both movable oil saturation and oil content. The results reveal that saline environments and lamellar structures promote hydrocarbon generation and migration from organic matter， resulting in high S₁.

Key words: oil-bearing property, mobility, movable oil content, well-log-based assessment, shale oil, Subei Basin

CLC Number:

TE122.1

Jun LI, Youlong ZOU, Jing LU. Well-log-based assessment of movable oil content in lacustrine shale oil reservoirs： A case study of the 2^nd member of the Paleogene Funing Formation， Subei Basin[J]. Oil & Gas Geology, 2024, 45(3): 816-826.

Figures/Tables 12

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Table 1

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储层类别	岩相		定性分析		定量分析
储层类别	岩性	沉积构造	RT/（Ω·m）	AC & RT重叠法	VFO/%	SMO/%	S₁/（mg/g）	OSI/（mg/g）
一类	含灰云质页岩、灰云质页岩、灰质页岩	纹层状	>10.0	差异幅度中等-大	>1.0	>20	>2	>200
二类	含灰云质页岩、灰云质页岩	纹层状、层状	6.5 ~ 10.0	差异幅度中等-小	>0.5	>10	1 ~ 2	100 ~ 200
三类	块状泥岩、云质泥岩、灰云质页岩	块状、层状	<6.5	无差异或差异大（异常低电阻率）	<0.5	<10	<1	<100

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Well-log-based assessment of movable oil content in lacustrine shale oil reservoirs： A case study of the 2^nd member of the Paleogene Funing Formation， Subei Basin

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Well-log-based assessment of movable oil content in lacustrine shale oil reservoirs： A case study of the 2nd member of the Paleogene Funing Formation， Subei Basin

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Well-log-based assessment of movable oil content in lacustrine shale oil reservoirs： A case study of the 2^nd member of the Paleogene Funing Formation， Subei Basin