适用于深层页岩气偏差因子计算方法的对比优选  

Methods to calculate a deviation coefficient for deep shale gas:Comparison and optimization

作　　者：邓雅霓 李怡雯 黄勇[3] DENG Yani;LI Yiwen;HUANG Yong(Southern Sichuan Gas District,PetroChina Southwest Oil&Gasfield Company,Luzhou,Sichuan 646000,China;Exploration and Development Research Institute,PetroChina Southwest Oil&Gasfield Company,Chengdu,Sich-uan 610041,China;Northeastern Sichuan Gas District,PetroChina Southwest Oil&Gasfield Company,Dazhou,Sichuan 635000,China)

机构地区：[1]中国石油西南油气田公司蜀南气矿,四川泸州646000 [2]中国石油西南油气田公司勘探开发研究院,四川成都610041 [3]中国石油西南油气田公司川东北气矿,四川达州635000

出　　处：《天然气勘探与开发》2024年第2期104-112,共9页Natural Gas Exploration and Development

摘　　要：偏差因子是天然气研究中不可缺少的一项基础数据,是理想气体状态方程用于实际气体时必须考虑的一个校正因子。在气藏储量计算、气田开发方案编制、气藏动态评价、油气储运等多个方面有着广泛应用。为此,以四川盆地川南地区泸州页岩气田2口井志留系龙马溪组气藏为例,通过在不同温度和不同压力条件下,对气藏偏差因子实测值与状态方程、经验公式、维里方程等高压气藏常用偏差因子计算方法进行对比,优选出最适用于深层页岩气藏的偏差因子计算方法。结果表明:扩展的维里方程计算结果与实测值相对误差始终小于3.51%,是所选方法中误差最低的,能降低勘探开发工作中因方法选取不当造成的气体体积偏差误差,具有较强的适用性,能满足深层页岩气藏在勘探开发各阶段的研究评价需要。As an essential basic data in natural-gas research,the deviation coefficient is also a correction factor that ought to be considered when the ideal equation of state is applied to actual gas.It has been widely used in the reserve calculation,the gasfield development scheme planning,the evaluation on reservoir performance,and the oil and gas storage and transportation.So,taken gas reservoirs of the Silurian Longmaxi Formation in two wells,Luzhou shale gas field,southern Sichuan Basin,as examples,the measured deviation coefficient was compared with the other from some approaches(for example,equation of state,empirical formula,and virial equation)commonly used for deep shale gas reservoirs under different temperature and pressure.Finally,an optimal method to calculate this coefficient was selected.Results show that the relative error between one from the extended virial equation and the measured result is always less than 3.51%,which is the lowest among the selected methods.Thus,this virial equation can help mitigate the error of gas volume deviation caused by improper methods.It enjoys strong applicability and meets the demand of evaluation on deep shale gas reservoirs in all stages of exploration and development.

关 键 词：页岩气 偏差因子 临界参数 维里方程 川南地区 早志留世 

分 类 号：P618.13[天文地球—矿床学]