National Coalbed Methane Engineering Center, China University of Geosciences (Beijing) China United Coalbed
Methane Corporation Ltd. Sinochem Petroleum Exploration and Development Corporation Ltd.

为明确柳林矿区煤层含气量主控因素,在对沉积作用、煤层埋深、灰分等控气因素分析的基础上,着重从水文地质和顶板岩性2主控因素出发,采用灰色关联和相关分析等数学方法,从煤层顶板厚度20 m以内的岩性组合关系上探求了柳林矿区煤层气的控气主导因素。结果表明:山西组3+4号煤层含气量变化符合一般规律,在顶板岩性组合关系中受封闭型(泥岩)影响最明显,为陆相地层气压封闭型成藏;太原组8+9号煤层含气量与煤层埋深、灰分、直接顶板岩性无直接关系,与顶板灰岩的厚度有关,组合关系受动态型(灰岩)主控,是海陆交互相地层水压封闭型成藏。

In order to clarifty the dominant factors controlling the coalbed methane (CBM) content in Liulin Mining Area, the paper focused on the hydrogeology and roof rock effects based on the analysis of sedimentology, burial depth, ash content, and other factors. The key roles controlling the CBM accumulation were acquired fro m the analysis of lithology combination within 20 m upon coal seams by methods of gray correlation, correlation analysis and other mathematical methods. Results sho wed that the gas content of No.3 + 4 coal seam in Shanxi Formation was accompany with the general rules, and was dominated by the Sealing Effect (mudstone) in the roof lithology combination. And the CBM reservoir was pressure closing reservoir in continental strata. The No.8 + 9 coal seams showed no direct connection with burial depth, ash content and roof rock. However, the gas content was closely related to the limestone thickness, and was controlled by the Dynamic Effect (limestone) . The CBM reservoir was hydraulic closing reservoir in paralic strata.

国家科技重大专项资助项目(2011ZX05062-01)；国家自然科学基金资助项目(4-1272175)；