恩洪向斜煤储层特性及其地质影响因素

Characteristics and Geological Controls of Coal Reservoirs in Enhong Syncline

根据恩洪向斜大量的煤田地质资料及煤层气勘探井的成果,分析研究了本区煤储层孔裂隙发育特征、含气性、渗透性,得出了以下结论:恩洪向斜具有煤层厚度大、分布面积广、煤级适中、含气量高等有利于煤层气开采的地质条件,但煤中孔隙分布导致渗流通道可能受阻,而且复杂而强烈的构造变动破坏了煤层的原生结构。根据煤层气试井资料,下部煤层渗透性好于上部煤层。重烃浓度极高是区内煤层气产出的一个显著特点。在今后煤层气勘探开发工作应重点加强构造特征的研究,并针对高含气性、低渗透性选用合适的勘探开发工艺。

Based on large quantity of information collected during coal exploration and drilled CBM wells,the study has been carried out on characteristics of pore and fissure,gas-bearing property and permeability in this area. It＇s believed that Enhong Syncline is characterized by large thickness of coal seam,extensive distribution area,medium rank coal and high gas content in coal reservoirs,which are good geology conditions to CBM development. However the pore structure led to possible delays of permeable channels,and the original coalbed was destroyed by complex and strong geological structure. Based on the drilled CBM wells,the permeability of the lower coalbed is better than the upper. High concentration of heavy hydrocarbon is a notable feature of CBM in this area. The emphasis of CBM exploration and development on future work is to study on structural characteristics. On the conditions of high gas-bearing and low permeability,choosing suitable technics for CBM exploration and development is also important.