黔西月亮田矿区YV－1井煤储层孔隙特征研究

摘要

With mercury intrusion test and low temperature nitrogen absorption test, the pore characteristics are studied for coal samples from six main seam of YV-1 well in Yueliangtian mining area, Western Guizhou. The mercury injection test results show that the pore volume and porosity of all the coal reservoirs are low, which has the feature of double peak structure, the pores are mainly adsorption pores, the micropores and transition pores developed, macropores well developed and mesopores most undeveloped. Different types pore have similar pore volume content and the mercury injection curves are similar for all coal samples. The seepage-flow pores are open pores with certain connectivity. The low temperature nitrogen adsorption experiment show that the specific surface area of all the coal reservoirs are large which is conducive for gas adsorption and accumulation. However, the adsorption pores are mostly comprised of one closed and airtight pores and ink bottle shape hole so that there are poor connections for adsorption pores, it might not be favorable to the desorption and development of the coalbed methane.%利用压汞试验和低温氮吸附试验，研究了黔西月亮田矿区YV－1井6个主要煤层煤样的孔隙特征。压汞试验结果表明：该区煤储层孔容和孔隙度均较小，以吸附孔隙为主，具有微孔和小孔发育、大孔较发育、中孔最不发育的双峰结构孔隙特征；各煤层间不同类型孔隙孔容含量及压汞曲线形态相近，渗流孔隙多为具备一定连通能力的开放孔。低温氮吸附试验表明：煤样比表面积较大，有利于煤层气的聚集，但吸附孔隙中存在较多的一端封闭的不透气性孔和墨水瓶状孔，吸附孔之间的连通性较差，不利于煤层气的解吸和开发。