页岩凝析气藏物质平衡方程及储量计算方法

发布时间：2018-05-19 09:22

本文选题：五种孔隙度 + 干酪根溶解气　；参考：《大庆石油地质与开发》2017年02期

【摘要】：页岩气藏的特点是无机基质孔隙、有机基质孔隙、天然裂缝孔隙、水力裂缝孔隙和吸附相孔隙并存。实验室和数学研究表明页岩气藏可以由五种孔隙度模型和干酪根溶解气储集机制来描述。基于Orozco和Aguilera方程,考虑页岩吸附气量和溶解气量随地层压力的变化以及两者对游离气储集空间的影响,建立页岩凝析气藏物质平衡方程。以Orozco和Aguilera文中的页岩凝析气藏为例,首先进行储量回归得到基质和裂缝游离气储量,再计算吸附气和溶解气储量以及总储量,然后根据各个储量所占比例计算一系列G_(pt)值(总的累计产气量),作p/Z_2(压力/两相气体偏差因子)和G_(pt)的关系曲线,与生产历史数据拟合较好。与Orozco和Aguilera的结果相比,总储量相差3%,各个储量所占比例也不尽相同。
[Abstract]:Shale gas reservoirs are characterized by the coexistence of inorganic matrix pores, organic matrix pores, natural fracture pores, hydraulic fracture pores and adsorptive pores. Laboratory and mathematical studies show that shale gas reservoirs can be described by five porosity models and kerogen dissolved gas reservoir mechanism. Based on the Orozco and Aguilera equations, the mass balance equation of shale condensate gas reservoir is established by considering the change of shale adsorption gas volume and dissolved gas volume and the influence of them on the free gas reservoir space. Taking the shale condensate gas reservoir in Orozco and Aguilera as an example, the reserves of matrix and fracture free gas are obtained by means of reserve regression, then the reserves of adsorbed gas and dissolved gas and the total reserves are calculated. Then, according to the ratio of each reserve, a series of GSP values (total cumulative gas production, P / Z _ 2 (pressure / two-phase gas deviation factor) and Gapp _ t) are calculated, which are in good agreement with the production history data. Compared with the results of Orozco and Aguilera, the difference of total reserves is 3% and the proportion of reserves is different.
【作者单位】：长江大学油气资源与勘探技术教育部重点实验室;
【基金】：国家科技重大专项“大型油气田及煤层气开发及勘探评价”(2011ZX05024-002-00,2016ZX05060-026)资助
【分类号】：TE155

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