论文部分内容阅读
南方古生界巨大的页岩气潜力近年来受到广泛关注。重点研究了南方古生界页岩的吸附特征及其控制因素。对采集的19件页岩样品,主要进行了矿物组成分析及等温吸附实验,并对典型样品开展了热模拟实验,研究了不同温度点的等温吸附容量,探讨了很高成熟度阶段页岩的吸附性能。结果表明,上二叠统页岩最大吸附量范围在0.21~5.63cm3/g之间,下志留统—下寒武统页岩最大吸附量范围在1.66~3.32cm3/g之间。页岩TOC含量是控制页岩吸附容量的主要因素。TOC含量越高,页岩的吸附容量越大。黏土矿物的吸附能力弱,其对页岩吸附容量的贡献一般被有机质所掩盖。成熟度是影响页岩吸附能力的另一关键因素。对于EqRO或RO<3.6%的样品,其吸附容量随着成熟度的增加而增加,但当EqRO或RO>3.6%,进一步增加成熟度,页岩的吸附容量有降低的趋势。
The huge potential of shale gas in the South Paleozoic has drawn much attention in recent years. The adsorption characteristics and controlling factors of Paleozoic shale in southern China are mainly studied. Twenty-nine shale samples were collected for mineral composition analysis and isothermal adsorption experiments. Thermal simulations of typical samples were carried out. The isothermal adsorption capacities at different temperature points were studied. The effects of high temperature on shale Adsorption performance. The results show that the maximum adsorption capacity of the Upper Permian shale ranges from 0.21 to 5.63 cm3 / g, and the maximum adsorption of the Lower Silurian-Lower Cambrian shale ranges from 1.66 to 3.32 cm3 / g. TOC content of shale is the main factor controlling shale adsorption capacity. The higher the TOC content, the greater the shale adsorption capacity. Clay minerals have weak adsorption capacity and their contributions to shale adsorption capacity are generally covered up by organic matter. Maturity is another key factor that affects shale adsorption capacity. For the samples with EqRO or RO <3.6%, the adsorption capacity increased with the maturity, but when the EqRO or RO> 3.6%, further increase the maturity, the adsorption capacity of shale tends to decrease.