潘庄煤层气区块15号煤储层物性特征研究

Study on Physical Characteristics of Coal Reservoir No.15 in Panzhuang Coalbed Methane Block

煤储层物性特征是影响煤层气开发成效的关键因素,文章基于潘庄煤层气区块地质、煤层气地质及煤层气勘探开发资料,采用煤层气地质理论对该区15号煤储层物性特征进行了研究。结果表明:研究区15号煤储层具有较好的含煤性和含气性,可为煤层气开发提供较好开发对象和气源保障;煤的孔裂隙系统相对发育,煤层渗透性好、渗透率高,有利于煤层气吸附、储集、扩散及渗流;15号煤储层地层能量普遍较弱,煤储层压力为“欠压”状态,不利于驱动煤层气高效产出;煤中具有良好的吸附储集煤层气空间,煤对煤层气的吸附能力强、吸附量大,但煤层气解吸速率较低。

The physical characteristics of coal reservoir are the key factors affecting the development of coalbed methane. Based on the data of panzhuang coalbed methane block, the paper studies the physical characteristics of No. 15 coal reservoir by using the theory of coalbed methane geology. The results show that No. 15 coal reservoir in the study area has good coal and gas properties, which can provide a good development object and gas source guarantee for CBM development. The pore and fracture system of coal is relatively developed, and the permeability of coal seam is good and high, which is conducive to the adsorption, storage, diffusion and percolation of CBM. The formation energy of No. 15 coal reservoir is generally weak, and the pressure of coal reservoir is in the state of “under pressure”, which is not conducive to the efficient production of coal-bed methane. The coal has a good adsorption and storage space of CBM, and the coal has a strong adsorption capacity and a large adsorption capacity, but the desorption rate of CBM is low.