贺西井田煤储层特征及煤层气开发方式研究

Study on Characteristics of Coal Reservoir and Development Mode of Coalbed Methane in Hexi Minefield

通过煤层宏观和显微镜下观察、含气量测试数据及相关资料整理分析,开展煤储层特征研究,并在此基础上优选井田西南区为煤层气开发"甜点区",采取丛式井开发方式进行分采及合采试验,由于两套煤层顶底板岩性、所处煤系水文地质条件不同导致分采产气量较高,试验结果表明该区不适合合层排采。

Based on the macroscopic and microscopic observation of coal seam, the test data of gas content and related data, the characteristics of coal reservoir has been studied. According to this, the southwest area of the well feld is selected as the ＂sweet spot area＂ for the development of coalbed methane. The method of cluster-well exploitation is adopted for separate production and combined production. Because of the two sets of coal seam roof and foor lithology and the different hydrogeological conditions in the coal system, the gas of separate production is high. The test results show that the area is not suitable for the coalbed production.