鄂东气田韩城矿区煤层横波时差测井曲线的构建方法  

Study on Establishing Method of Shear Wave Logging Curves for Coalbed in Eastern Block of Ordos Basin

作　　者：杨秀春 张继坤 周科 

机构地区：[1]中国石油煤层气有限责任公司,北京100028

出　　处：《测井技术》2014年第3期304-308,共5页Well Logging Technology

基　　金：中国石油天然气股份有限公司科学研究与技术开发项目(2010E-2207)

摘　　要：鄂东气田韩城矿区是中国重要的煤层气有利开发区,但绝大多数井未测横波时差曲线,给钻井设计中岩石力学参数计算、压裂设计中压裂高度预测带来诸多不便。针对研究区煤岩地层的实际地质特征,充分挖掘与煤层横波时差较为敏感的测井参数,构建一种适合于煤岩地层有效的横波时差曲线计算方法。利用纵波和密度测井构建了横波时差拟合方程,通过系统分析优选中子、密度及电阻率测井三参数构建了岩性指示曲线,进而采用岩性指示曲线建立横波时差计算模型;基于煤层岩石体积物理和煤岩地层的多矿物组分体积模型,对煤岩地层的横波时差进行反演。对研究区的横波时差进行拟合计算,纵波和密度测井构建横波时差的方法较为简单、直观,但精度不高;而岩性指示曲线法和多矿物组分体积模型法均能较好地对其煤层横波时差进行计算,但多矿物组分体积模型中的参数求取相对较难。Eastern block of Ordos basin is an important and favorable development coalbed methane zone.However,there are no logging curves of shear wave time in some wells,thus it brings so much inconvenience for calculating rock mechanics parameter in the design of drilling,predicting fracturing height in fracturing design.Therefore,according to the actual geological characteristics of coal formation in the studied area,the method that is suitable for the coal formation is established fully using logging data which is more sensitive to shear wave time of coalbed.The fitting equation of shear wave time is established using compression wave and density logging;the calculation equation of shear wave is constructed using the lithology indicator curve which is built using three parameters of neutron,density and resistivity logging through the systematic analysis.Based on the volume physics model of coalbed and the volume model of many mineral components of coalbed,the shear wave inversion of coalbed formation is carried out.The shear wave time is calculated in the studied area,the results show that the model of shear wave time is relatively simple and intuitive using the compression wave and density logging,but the accuracy is not high;the shear wave time of coalbed gas can be well calculated by the model of lithology indicator curve and the model of multiple mineral constituent volume,but the parameters calculation of mineral constituent volume model is relatively difficult.

关 键 词：测井解释 煤层气 横波时差 测井曲线 鄂东气田 

分 类 号：P631.84[天文地球—地质矿产勘探]