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

摘要/Abstract

摘要： 页岩油的赋存状态影响其可动性及可采性。为了定量评价不同赋存状态页岩油含量（吸附量与游离量）及其比例，建立了一系列数学模型，初步形成了页岩油吸附与游离定量评价理论框架，可用于分析：①非饱和吸附状态（0<p/p₀<1）下单组分烃的吸附量与游离量；②饱和吸附状态（p/p₀ ≥ 1）下单组分烃和混合烃（残余油）的吸附量与游离量及其比例。模型综合考虑了页岩油微观赋存特征（吸附相与游离相密度、吸附相厚度）、页岩孔隙微观结构（形态、大小、孔体积、比表面积）以及页岩储层物性（孔隙度、含油饱和度、视密度）。基于模型并结合中国东部湖相页岩油靶区（以东营凹陷为例），初步揭示了页岩油微观赋存机制，认识到：①页岩油吸附量与游离量及其比例受多参数综合影响；②当孔径小于约50 nm时，孔隙大小对吸附油和游离油含量及其比例影响较为显著；当孔径大于约50 nm时，孔隙大小影响较弱，此时游离油量依赖于含油孔体积。

关键词: 吸附量, 游离量, 微观结构, 评价模型, 赋存机制, 页岩油, 东营凹陷

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

中图分类号:

TE121

李俊乾,卢双舫,张婕,等. 页岩油吸附与游离定量评价模型及微观赋存机制[J]. 石油与天然气地质, 2019, 40(3): 583-592. doi: 10.11743/ogg20190313 Li Junqian,Lu Shuangfang,Zhang Jie,et al. Quantitative evaluation models of adsorbed and free shale oil and its microscopic occurrence mechanism[J]. Oil & Gas Geology, 2019, 40(3): 583-592. doi: 10.11743/ogg20190313

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