基于嵌入离散裂缝的页岩气藏视渗透率模型

发布时间：2019-06-11 18:26

【摘要】：页岩储层具有不同类型的储集空间,但综合考虑不同储集空间,对页岩储层渗透率进行评价的模型未见报道.基于嵌入离散裂缝模型,建立的页岩气藏视渗透率模型包括4个步骤:(1)构建天然裂缝、有机质和无机质的空间分布模型;(2)筛选不同类型储集空间的渗透率计算方法;(3)基于嵌入离散裂缝模型,结合空间分布模型和渗透率计算方法,建立数值模拟模型;(4)在模型的入口和出口端施加压差,求得一定压差下通过该岩心的气体流量,采用达西定律得到该页岩气藏的视渗透率.其计算结果与文献报道的渗透率实验值吻合较好.通过对不同因素的探讨,结果表明,天然裂缝对页岩气藏视渗透率的贡献大于无机质和有机质孔隙.因此,计算页岩视渗透率时有必要对天然裂缝、有机质和无机质孔隙进行综合考虑.
[Abstract]:Shale reservoir has different types of reservoir space, but considering different reservoir space, the evaluation model of shale reservoir permeability has not been reported. Based on the embedded discrete fracture model, the apparent permeability model of shale gas reservoir consists of four steps: (1) the spatial distribution model of natural fracture, organic matter and inorganic matter; (2) the permeability calculation method of different types of reservoir space; (3) based on the embedded discrete fracture model, combined with the spatial distribution model and permeability calculation method, the numerical simulation model is established. (4) the gas flow rate through the core under certain pressure difference is obtained by applying pressure difference at the entrance and outlet of the model, and the apparent permeability of the shale gas reservoir is obtained by using Darcy's law. The calculated results are in good agreement with the experimental values of permeability reported in the literature. Through the discussion of different factors, the results show that the contribution of natural cracks to the apparent permeability of shale gas reservoir is greater than that of inorganic and organic matter pores. Therefore, it is necessary to consider natural fractures, organic matter and inorganic pores in calculating apparent permeability of shale.
【作者单位】：中国石油大学石油工程学院;中国石油西南油气田分公司工程技术研究院;河南省航空物探遥感中心;河南省地矿局第一地质环境调查院;
【基金】：国家重点基础研究发展计划(973计划)项目(No.2015CB250905) 中国博士后创新人才支持计划项目(No.BX201600153) 中国博士后科学基金资助(No.2016M600571) 青岛市博士后应用研究项目(No.2016218)
【分类号】：TE311

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