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在地层条件下,受多种因素综合作用,黏土矿物对页岩储层特征及吸附能力的作用较为复杂,难以进行客观评价。基于此,结合大量文献调研,通过前人XRD分析、扫描电镜观察、N_2吸附实验、甲烷等温吸附实验等方法,研究黏土矿物特征及其影响因素,以期更客观地评价黏土矿物对页岩储层及吸附能力的贡献。研究认为:黏土矿物具有较大的比表面积,但受多种因素影响,其对甲烷分子的吸附能力主要取决于黏土矿物与有机质的赋存关系;黏土矿物对有机质既有富集作用又有催化生烃作用,富集的有机质可减少黏土矿物表面的吸附位,而有机质生烃产生的有机质孔隙又增加了吸附空间,二者的相互作用及相对含量的匹配关系对页岩储层含气量影响较大;广泛存在的地层水虽然能降低其对甲烷分子的吸附能力,但并不意味着页岩储层含气量一定会低,这主要取决于有机质的发育情况。正确认识黏土矿物的作用可为最优含气量组合分析以及勘探“甜点”选择提供依据。
Under the conditions of formation, under the combination of many factors, the effect of clay minerals on the characteristics and adsorption capacity of shale reservoirs is complicated and it is difficult to evaluate objectively. Based on this, combined with a large amount of literature research, the characteristics of clay minerals and their influencing factors are studied by means of XRD analysis, scanning electron microscope observation, N 2 adsorption experiment and methane isothermal adsorption experiment. In order to evaluate the effects of clay minerals on shale reservoirs And adsorption capacity contribution. The study shows that clay minerals have large specific surface area but are affected by many factors. The adsorption capacity of methane minerals mainly depends on the occurence of clay minerals and organic matter. Clay minerals have both enrichment and catalysis on organic matters The role of hydrocarbon generation and enrichment of organic matter can reduce the adsorption sites on the surface of clay minerals, and the porosity of organic matter produced by organic hydrocarbon generation increases the adsorption space, the interaction between them and the relative content of the impact on the gas content of shale reservoirs Large; widespread formation water reduces its ability to adsorb methane molecules, but does not mean that the gas content of shale reservoirs must be low, depending on the development of organic matter. The correct understanding of the role of clay minerals can provide the basis for the combination analysis of optimal gas content and exploration “sweet” selection.