页岩含气量的影响因素分析及含气量测试方法

北美页岩气的商业开发,掀起了全球勘探页岩气的热情,我国页岩广泛分布,资源潜力巨大。页岩气主要以游离态和吸附态存在于富有机质页岩中,含气量研究是页岩气资源评价的重要参数。总结国内外页岩气勘探开发研究成果,认为页岩气含气量的影响因素主要有有机质丰度和成熟度、孔隙结构和孔隙体积、矿物含量、裂缝发育程度、地层温度和压力,它们对含气量的影响主要体现在,有机质丰度和含气量正相关,成熟度越高,含气性越好;微孔比例越大,吸附性能越好;黏土矿物控制吸附气含量;微裂缝发育有助于吸附气的解吸,裂缝规模发育过大将破坏泥页岩的封闭性,不利于气体的储存;吸附气随压力的增加而加大,温度升高,吸附气量将成倍下降。并分析了目前页岩气含气量的测试方法,对比总结了各种测试方法的利弊。

Factors affecting the shale gas content and gas content testing methods

Commercial development of shale gas in North America, setting off a global exploration enthusiasm of shale gas . Shale widely distributed in China, our country have huge resource potential. Shale gas mainly save in organic-rich shale by the state of free and adsorbed, Gas content is an important parameter of resource evaluation. Summarizing research of shale gas exploration and development account that factors controlling gas content of shale gas including total organic content, organic maturity, pore types and pore volume, mineral composition and content, fracture, formation temperature and pressure, their impact on gas content is mainly reflected in gas content has positive correlation with total organic matter, the higher maturity the more gas; The larger proportion of micropore, the more adsorbed gas; Clay minerals controlling adsorbed gas content; Micro-fractures contribute to desorption of the adsorption gas and crack-scale is too large destructed the closed shale, detrimental to gas storage; Adsorbed gas increases with increasing pressure and adsorption gas will decrease exponentially with increasing temperature. And analysis of the current testing methods of shale gas content, comparing and summarizing the advantages and disadvantages of the various test methods.