安徽淮北煤成气形成条件及其资源

安徽淮北石炭、二叠纪煤系有机质丰度高，热演化程度已达高成熟阶段，生气潜力很大。本区一次生气条件因构造活动遭到相当程度的破坏，但燕山期强烈的岩浆侵入和地区西部及北缘中、新生代大幅度沉降提高了有机质热演化程度，创造了二次生气的有利条件。

Forming Condition of Coal Gas in Huaibei, Anhui and Its Resources

The organism in coal measures of Permocarboniferous period in Huaibei of Anhui is very rich,and the degree of temperature evolution of the organism had got in a mature stage,so the gas producing potentiality is very great.The condition of gas producing for the primary generation in early period of this region was fairly destroyed by tectonic movement,but the intense magmatic intrusion of Yanshanian period and the deep settling of Mesozoic Neozoic era in the west of Huaibei and its north border had raised the degree of temperature evolution of organism,and thus the favorable conditions of gas producing for the secondary generation was created. The sandstone beds of delta facies depositions in Permo Carboniferous coal measures and the sandstone beds in Mesozoic Neozoic group are good reservoirs of gas.The clay rocks of Permo Carboniferous system and Mesozoic Neozoic group constituted the covering strata.There existed the upper,the middle and the lower source reservoir cap rock associations in Permo Carboniferous system.The later got together with the Mesozoic Neozoic groups to make up another source reservoir cap rock association. In this region,the Jianghe syncline and Nanping syncline in the middle part and the north border and west part are the advantageous areas to the discovery of coal gas.