页岩油吸附与游离定量评价模型及微观赋存机制

doi:10.11743/ogg20190313

Abstract

Abstract: The occurrence state of shale oil affects both its mobility and recoverability.In order to quantitatively evaluate the shale oil contents in different occurrence states (adsorbed and free) and their ratios,a series of mathematical models and a theoretical framework for quantitative evaluation of adsorbed and free shale oil were established.They can be used to evaluate:①the contents of adsorbed and free single-component hydrocarbons under unsaturated adsorption conditions (0<p/p₀<1);②the contents of adsorbed and free single-component hydrocarbons and mixed hydrocarbons (remaining oil) and their ratios under saturated adsorption conditions (p/p₀ ≥ 1).The models have comprehensively taken into account the microscopic occurrence characteristics of shale oil (density of adsorbed and free phases,thickness of adsorbed phase),microscopic structure of shale pores (morphology,size,pore volume,specific surface area) and physical properties of shale reservoir (porosity,oil saturation,apparent density).According to the models and the target area of lacustrine shale oil in eastern China (a case study of Dongying sag),the microscopic occurrence mechanisms of shale oil are preliminarily revealed and the following understandings are obtained:① the contents of adsorbed and free oil and their ratios are jointly controlled by multiple influential parameters;② the impact of pore size is significant when the pore size is less than 50 nm or so,while when the pore diameter is larger than 50 nm or so,the impact is relatively weak,and the content of free oil depends on the volume of oil-bearing pores.

Key words: adsorbed content, free content, microstructure, evaluation model, occurrence mechanism, shale oil, Dongying sag

CLC Number:

TE121

Li Junqian, Lu Shuangfang, Zhang Jie, Zhang Pengfei, Xue Haitao. Quantitative evaluation models of adsorbed and free shale oil and its microscopic occurrence mechanism[J]. Oil & Gas Geology, 2019, 40(3): 583-592.

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Quantitative evaluation models of adsorbed and free shale oil and its microscopic occurrence mechanism

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