岩浆活动对红阳煤田煤层气成藏的地质控制

Geological Controls of Magmatism on the Formation of Coalbed Methane in Hongyang Coalfield

本文研究表明:岩浆活动是红阳煤田煤变质程度及含气性存在显著差异的主控因素。燕山期隐伏岩浆对煤层气生成及富集总体有利,喜山期岩浆侵入导致局部产气量增加,同时形成了煤层气运移的通道,使煤层气成藏条件复杂化。在岩浆活动的影响下,煤田内可划分为低变质区、岩床侵入区、高变质区、天然焦化区及吞蚀区5种煤层气勘查开发区类型。"岩床侵入区"12号煤含气量高、储层裂隙发育,是区域煤层气勘查开发的最有利区。

Research in this paper shows that magmatism is the metamorphism degree and gas-bearing have significant difference main geological control factor that coal in Hongyang coalfield. Concealed magmatism is generally favorable to CBM generation and enrichment in Yanshan Epoch. Magmatic intrusion increases the CBM generation locally in Himalayan Epoch, and forms the migration pathways for CBM at the same time. Magmatism complicates the geological conditions of CBM resources formation and develop- ment, and five kinds of CBM exploration and development areas are formed in Himalayan Epoch. Bedrock intrusion area has high CBM content and large numbers of cleats, which is the most advantageous area of CBM exploration and development.