黔西松河井田多层叠置独立含煤层气系统

发布时间：2019-02-17 14:18

【摘要】：从研究区含煤岩系地质、沉积构造和水文等方面入手,探讨了松河井田龙潭组含煤层气系统垂向上的分布规律。结果表明:该区煤层硫分与灰分总体上呈上、下高,中间低的规律;煤层含气量由顶部至底部总体呈现"上升下降上升"的趋势;煤层埋深压力系数关系揭示煤层垂向上至少可划分为2套压力系统。龙潭组3个二级层序与3个岩性分段的地层界限较为一致,奠定了独立含煤层气系统的物质基础;每套系统之间缺乏水力联系,富水性呈"弱中等弱"的变化规律,构成了独立含煤层气系统的水文地质基础。龙潭组多层叠置独立含煤层气系统,是沉积水文构造条件耦合控气作用的产物,划分为3个独立含煤层气系统。研究结果为松河井田煤层气勘探开发提供地质依据。
[Abstract]:The vertical distribution of coalbed methane system in Longtan formation of Songhe mine field is discussed from the geological, sedimentary structure and hydrological aspects of coal-bearing rock series in the study area. The results show that the sulfur content and ash content of coal seam in this area are generally upward, lower and lower, and the gas content of coal seam is rising from the top to the bottom. The relationship between the pressure coefficient and the buried depth reveals that the vertical coal seam can be divided into at least two sets of pressure systems. The three secondary sequences of the Longtan formation are consistent with the stratigraphic boundaries of the three lithologic subsections, which establishes the material foundation of the independent coal-bed methane system. There is a lack of hydraulic relation between each set of systems, and the change of rich water content is "weak and moderate weak", which forms the hydrogeological basis of independent coal-bed methane system. The independent coalbed methane system of the Longtan formation is a product of the coupling of sedimentary hydrologic and tectonic conditions to control gas, and is divided into three independent coal-bed methane systems. The results provide geological basis for coalbed methane exploration and development in Songhe mine field.
【作者单位】：贵州省煤层气页岩气工程技术研究中心;
【基金】：国家科技重大专项任务(2016ZX05044-001-005) 国家自然科学基金项目(41272145)~~
【分类号】：P618.13

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