新型页岩气藏物质平衡方程

发布时间：2018-05-18 04:01

本文选题：吸附相密度 + 基质裂缝　；参考：《断块油气田》2017年03期

【摘要】：页岩气主要以吸附气的形式吸附在基质微孔隙表面,以游离气的形式存在于基质孔隙和裂缝孔隙中,不考虑基质、裂缝双重孔隙介质的页岩气藏物质平衡方程不能准确地计算储量。文中从质量守恒的角度建立了同时考虑吸附相密度、吸附相视孔隙度、吸附气解吸对固相变形的影响,以及基质和裂缝孔隙体积随压力变化的新型物质平衡方程。通过实例计算可知:游离气主要存在于裂缝孔隙中,吸附气储量占据总储量的52.15%,基质中游离气储量、裂缝中游离气储量、基质中吸附气的储量的计算结果与基质孔隙度、裂缝压缩系数和吸附相密度密切相关。因此,在进行储量计算时需要考虑基质和裂缝双重孔隙介质,并应加强对基质孔隙度、裂缝压缩系数和吸附相密度的研究,以获取更加准确的参数。
[Abstract]:Shale gas is mainly adsorbed on the surface of matrix micropores in the form of adsorbed gas, which exists in the form of matrix pores and cracks in the form of free gas. The material balance equation of shale gas reservoir in the double pore medium of fracture can not be accurately calculated. The effect of the porosity, the effect of adsorption gas desorption on the solid state deformation and the new material equilibrium equation of the matrix and the pore volume with the pressure change, it is found that the free gas is mainly in the fractured pores, and the adsorbed gas reserves occupy 52.15% of the total reserves, the middle reaches of the gas reserves, the gas reserves in the middle of the crack and the matrix in the matrix. The calculation results of the reserves of adsorbed gas are closely related to matrix porosity, fracture compression coefficient and adsorption phase density. Therefore, the dual pore medium of matrix and fracture should be considered in the calculation of reserves, and the study of matrix porosity, crack compression coefficient and adsorption phase density should be strengthened in order to obtain more accurate parameters.
【作者单位】：长江大学非常规油气湖北省协同创新中心;西南石油大学石油与天然气工程学院;中国石化重庆涪陵页岩气勘探开发有限公司;
【基金】：国家科技重大专项课题“涪陵地区五峰组—龙马溪组页岩气压裂及采气规律研究”(2016ZX05060-026);国家科技重大专项专题“基于非线性渗流的海上砂岩稠油油藏剩余油精细表征研究”(2016ZX05025-001-005)、“厚层非均质性气藏渗流机理及开发技术政策研究”(2016ZX05027-004-005)
【分类号】：P618.13

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