浅谈煤层气测井技术

An Elementary Introduction to CBM Logging Technology

目前用于煤层气测井的主要设备有美国蒙特系列Ⅲ数字测井仪、渭南煤矿专用设备厂TYSC型和北京中地英捷物探仪器研究所PSJ-2型数字测井仪系统。煤层气裸眼井常测的参数有自然伽马、长短源距人工伽马、自然电位、双侧向、双井径、声波、补偿中子、井温、井斜等,而固井质量检查测井则用自然伽马、声幅、声波变密度和磁定位等方法。受井径过大的影响,密度三侧向测井、声速和补偿中子测井会存在较大误差。另外《煤层气测井作业规程》是单一企业标准,其中有些规定在实际执行过程中存在诸多问题,需在实践中进行修正。

At present, main digital loggers used in CBM logging have Series III of American Mount Sopris, TYSC type of Weinan Coalmine Specialized Equipment Manufactory and PSI-2 of Beijing Zhongdi Yingjie Geophysical Exploration Instrument Institute. Regular measured parameters in CBM uncased hole have gamma-ray, long and short spaced artificial gamma, spontaneous potential, dual lateral, dual caliper, acoustic, compensated neutron, well temperature and deviation etc, while gamma-ray, acoustic amplitude, acoustic variable density and magnetic locating methods are used in cementing quality evaluation. As affected by excessive borehole diameter, major errors will be happened in density triple lateral, acoustic velocity and compensated neutron logs. Besides, the ＂CBM Logging Operation Regulations＂ is a simplex enterprise standard, some stipulations in it will have a good many problems during executive process and need to be amended in practices.