煤储层开发动态地质评价理论与技术进展

Geological Evaluation Theory and Technology Progress of Coal Reservoir Dynamics During Coalbed Methane Drainage

项目组以沁水盆地、鄂尔多斯盆地等为研究对象,取得了煤层气高产井区地质控制模式、煤储层物性动态规律与数学模型、多层叠置含煤层气系统、煤层气开发解吸阶段数值描述等4项理论认识;形成了煤层水及孔隙低场核磁共振表征、煤层气有利建产区地质综合评价、多层叠置含气系统煤层气递进排采地质设计、煤储层开发地质动态评价等4项评价技术;研发了多煤层多场耦合煤层气开采物理模拟试验系统、煤层气直井流体参数探测仪、煤层含气量天然源超低频电磁探测仪等3套装备,初步形成了适合于研究区地质条件的煤层气开发地质保障技术体系框架,为满足煤层气大规模开发需求提供了参考。

Taking Qinshui and Ordos basins as the research objects, four theoretical knowledges were sugessted such as the geological con- trol modes of CBM high-production wellblock, the dynamic and mathematical model of coal reservoir properties, the multiple superposed CBM systems （MS-CBMS） and the numerical description of CBM drainage and desorption phases.Four evaluation technologies were devel- oped including the nuclear magnetic resonance characterization of coalbed water and pore, the comprehensive geological evaluation of favor- able CBM production-building region, the geological design of progressive CBM drainage for the MS-CBMS, and the geological evaluation of coal reservoir development dynamic.Three sets of the equipments were developed for the physical simulation of the CBM drainage under the multiple coalbeds and fields, the detection of the fluid parameters in vertical CBM wells and the detection of the CBM content with nat- ural ultra-low frequency electromagnetic wave.A geological service technology system framework of the CBM drainage suitable to the geo- logical conditions of the basins had been initially set up, so as to provide a basis for meeting the national demands of large-scale CBM de- velopment.