煤储层岩石物理研究与煤层气勘探选区及开发

THE RESEARCH OF PETROPHYSICS OF COAL RESERVOIRS AND SELECTED EXPLORATORY DISTRICTS OF COALBED METHANE AND RECOVERY

近年来，煤储层岩石物理研究工作取得了很大进展，研究内容从煤储层孔隙、裂隙系统逐步扩展到煤储层渗透性评价以及含气饱和度和煤层气封闭的研究；从煤储层的固相特征研究逐步延伸到煤储层中流体生成、储存与孔隙、裂隙内在关系的分析；从测试煤的物理力学特性发展到对煤储层可改造性评价；从单项参数测试评价发展到对煤层气藏可采性的综合评价；从对煤层气的产出特征研究发展到对煤层气藏成藏条件的综合分析。煤储层的分析测试技术也在不断发展与完善，煤储层岩石物理描述参数已由定性逐步向半定量和定量方向发展。目前已初步形成依托矿井人工煤储层露头进行煤储层岩石物理研究的一整套工诈方法。由于充分利用了几乎存在于所有煤矿区的矿井人工露头，使得煤储层岩石物理研究不受勘探井的限制，获取的可靠地质信息愈来愈丰富。评价的领域不断扩大，可靠性在不断提高，已初步形成了与煤层气钻井参数评价互为补充，相互睑证的格局。展望煤储层岩石物理性质研究的发展方向，作者认为煤储层岩石物理研究对煤层气勘探选区及开发具有十分重要的应用前景。

Recently, the study of petrophysics of coal reservoirs was greatly advanced. The study contents have been expanded from the analysis of the pore-fracture system of coal reservoirs in the beginning to the evaluation of coal reservoirs permeability, gas saturation and CBM pool trap, from solid properties analysis of coal reservoirs to the relationship analysis between fluid formation, reserve and pore-fracture system, and from testing the physical mechanic properties of coal to the evaluation of coal reservoirs reformbility. The testing parameters of coal reservoirs were a few at the beginning but now are plentiful for systhetical evaluation of CBM extractability and forming conditions of CBM pool. The testing techniques of coal reservoirs have been developed and the description parameters of petrophysics of coal reservoirs have been changed from qualitative at the beginning to semi-quantitative or quantitative now. The research procedures and methods of petrophysics of coal reservoirs mainly depending on the artificial outcrop analysis of coal resservoirs have been tentatively built. The detial research districts of petrophysics of coal reservoirs expanded rapidly from exploratory districts of drilling CBM wells at the beginning to the other districts now, having acquired plentiful geological informations by the observation and research of artificial coalbed outcrop underground coal mine. The situation of complement and verify each other between the parameters evaluation of CBM wells and the parameters analysis of coalbed outcrop underground coal mine have been tentatively formed. Looking ahead the developing direction of the study of petrophysics of coal reservoirs, the authors believe that the study will show great significance in CBM exploration and development.