利用测井资料求取煤层气含量的方法  

Evaluation Technology of Coalbed Methane Content by Using Log Data

作　　者：张翠华[1] 张志存[1] 林枫[1] 

机构地区：[1]大庆钻探工程公司测井公司,黑龙江大庆163412

出　　处：《测井技术》2015年第3期347-351,共5页Well Logging Technology

摘　　要：煤层气与常规天然气的成因与储集特性均有很大不同,常规天然气测井识别技术不适用于煤层气。在分析煤层气含量影响因素和煤岩等温吸附实验的基础上,利用煤质组分结合上覆地层厚度、温度、压力等参数,拟合出煤岩的等温吸附曲线,得到煤层的理论含气量;通过对煤层理论含气量与实际含气量的分析,引入含气饱和度,首次提出了利用测井资料计算煤层含气饱和度的方法,计算得到煤层的实际含气量。该方法经过在东北2个煤田应用,计算的煤层气含量与现场实测含气量平均绝对误差小于±0.5m3/t。Since it is very different for cause and reservoir characteristics of coalbed methane （CBM） reservoirs and conventional gas, so the conventional gas logging recognition technology is not applicable to CBM. On the basis of analysis of the effect factor on CBM content and the isothermal adsorption experiment of coal rock, coal components and other parameters such as thickness of overlying strata, temperature and pressure etc. are used to fit the isothermal adsorption curves for coal rock, and the theory gas content is got for coal bed. Based on theory and actual gas content analysis, the gas saturation can be introduced, the method is put forward for the first time and the gas saturation is calculated by log data, and the actual gas content can be calculated for coal bed. Through applications of the two coal fields in northeast area of China, the average absolute error is less than --0.5 m^3/t between calculating and field testing CBM content.

关 键 词：测井应用 煤层气含量 含气饱和度 等温吸附曲线 Langmuir常数 

分 类 号：P631.84[天文地球—地质矿产勘探]