海相页岩与海陆过渡相页岩吸附气量主控因素及其差异性

发布时间：2018-11-14 15:29

【摘要】：以黔北地区下寒武统牛蹄塘组海相页岩和南华北地区下二叠统太原-山西组海陆过渡相页岩为研究对象,分析页岩有机地化、储层、吸附气量特征,进而研究页岩吸附气量影响因素及其差异性。研究结果表明:页岩有机碳含量大于2%,两者均为优质的烃源岩;但有机碳含量相差甚大。牛蹄塘组页岩矿物组成主要为石英,其次为黏土矿物,而太原-山西组页岩以富集黏土矿物为特征。牛蹄塘组页岩比表面积和吸附气量大于太原-山西组页岩;而总孔体积和平均孔径均小于后者。页岩岩石组成与吸附气量之间的关系如下:牛蹄塘组页岩TOC与吸附气量呈正相关关系且TOC是吸附气量的主要影响因素;而太原-山西组页岩TOC与吸附气量之间关系不明显。牛蹄塘组页岩石英与吸附气量呈正相关性,其原因是石英为生物成因,伴随有机质富集;而太原-山西组页岩石英与吸附气量具有负相关性,其原因为TOC和黏土矿物随石英的增加而减少,且TOC、黏土矿物与吸附气量呈正相关关系。牛蹄塘组页岩伊利石和太原-山西组页岩黏土矿物均与吸附气量具有正相关性,原因为黏土矿物吸附有机质且黏土矿物中各组分发育大量孔隙。
[Abstract]:Taking the marine shale of the Lower Cambrian Niutetang formation and the Lower Permian Taiyuan-Shanxi formation of the South North China as the research objects, the organic geochemistry, reservoir and adsorbed gas capacity of the shale are analyzed. Furthermore, the influence factors and their differences of shale adsorption gas volume were studied. The results show that the content of organic carbon in shale is more than 2, both of which are high quality source rocks, but the content of organic carbon is quite different. The mineral composition of Niulitang formation shale is mainly quartz, followed by clay minerals, while the Taiyuan-Shanxi formation shale is characterized by rich clay minerals. The specific surface area and adsorption gas capacity of Niutetang formation shale are larger than those of Taiyuan Shanxi formation shale, but the total pore volume and average pore size are smaller than the latter. The relationship between the composition of shale rocks and the amount of adsorbed gas is as follows: the TOC of Niulitang formation shale is positively correlated with the amount of adsorbed gas, and TOC is the main factor affecting the amount of adsorbed gas, but the relationship between TOC and adsorbed gas quantity of Taiyuan-Shanxi formation shale is not obvious. The shale quartz of Niulitang formation has a positive correlation with the amount of adsorbed gas. The reason is that quartz is biogenetic and associated with the enrichment of organic matter. However, there is a negative correlation between the amount of adsorbed gas and shale quartz in Taiyuan and Shanxi formation, which is due to the decrease of TOC and clay minerals with the increase of quartz, and the positive correlation between TOC, clay minerals and the amount of adsorbed gas. The shale Illite of Niulitang formation and the shale clay minerals of Taiyuan-Shanxi formation have positive correlation with the amount of adsorbed gas, because clay minerals adsorb organic matter and a large number of pores are developed in clay minerals.
【作者单位】：中国地质大学(北京)能源学院;页岩气勘查与评价国土资源部重点实验室;河南地质调查研究院;铜仁中能天然气有限公司;
【基金】：国家自然科学基金(41102088)资助
【分类号】：P618.13

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