河北省开平煤田煤层气成藏条件浅析

Elementary Analysis of CBM Reservoir-Forming Conditions in Kaiping Coal Basin in Hebei Province

从煤系的沉积、埋藏、煤的演化生气以及气藏的改造定型等方面分析了河北省开平煤田煤层气的形成与演化过程,进而对煤层气藏特征及煤层气富藏条件进行了剖析。开平煤田整体上为一不对称向斜构造,聚煤作用和后期沉积对煤层气藏的形成演化比较有利,煤层气富集成藏的生气、储气及保存条件具备,主要成藏目标煤层7、8、9、12号煤层厚度大且分布稳定,尤其向斜的西北翼成藏条件较好,可作为有利区优先安排煤层气勘查工作。

The authors describe the evolution and formation process of coalbed methane in Kaiping coal basin in aspects of sedimentation and occurrence of coal measures, evolution of coal and gas-formation as well as transformation and finalization of gas reservoir. The authors make a further analysis of characteristics and enrichment conditions of the CBM reservoir. On the whole Kaiping coalfield is an asymmetrical syncline structure. Coal formation and sedimentation in later stage are favorable to formation and evolution of CBM reservoir. The coalfield possesses conditions for CBM enrichment, formation, storage and preservation of CBM. The major target seams are Nos. 7, 8, 9 and 12 seams, which are thick and regularly distributed. Especially the northwest limb of the syncline has good CBM - forming conditions, which can be regarded as favorable block and priorities can be given to this part of syncline in arrange reconnaissance of CBM.