沁水盆地和顺地区煤层气储层物性特征

在对沁水盆地和顺地区煤层气有利区带的地质资料进行相关分析基础上,采集了不同煤矿井下煤样和顶板盖层样品并进行了超声波测试,初步形成了在地层温度与压力条件下的煤样采集、样品制备及测试分析等基本岩石物理参数测试技术。应用MTS岩石物理参数测试系统对该区煤样进行岩石物理参数测试,获得该区煤层气有利区带储层岩石物理参数测试数据及其分布范围,表明煤层纵横波速度之间具有良好的线性关系,煤样及盖层样在纵横波衰减方面存在-定的差异。煤层的弹性特征与盖层存在明显差异,并具有较强的各向异性和非线性特征,可为岩石物理模型、实际模型的数值模拟和波场特征分析提供依据,也为煤层气的预测提供了-种途径。

Physical characteristics of coalbed methane reservoir in Heshun Area of Qinshui Basin

Aiming at a favorable coalbed methane area in Heshun region of Qinshui Basin,we obtain and analyze the related geological data in different coal mines.We also collect coal samples and roof rock samples in downhole.Including to coal samples collection,preparation,testing and analysing technotogy.A basic rock physical parameter experiment testing technology under strata temperature and pressure is initially formed by ultrasonic testing.Using MTS(a rock mechanics test system), we obtain rock physical parameter data in favorable coalbed methane zones,the distribution of coalbed density,and the distribution of P-wave and S-wave velocities.According the analysis,we find a good linear relationship between P-wave velocity and Swave velocity of coal samples.There are some differences in terms of the P-wave and S-wave attenuations between coal samples and roof samples. Between coal seam and cap rock,elastic characteristics are obviously different with stronger anisotropy.These characteristics may lay a foundation for numerical simulations of the rock physical model and wave field characteristics analysis.It may also provide a tool to predict coalbed methane.