【摘要】：以黔北地區(qū)下寒武統(tǒng)牛蹄塘組海相頁巖和南華北地區(qū)下二疊統(tǒng)太原-山西組海陸過渡相頁巖為研究對象,分析頁巖有機(jī)地化、儲層、吸附氣量特征,進(jìn)而研究頁巖吸附氣量影響因素及其差異性。研究結(jié)果表明:頁巖有機(jī)碳含量大于2%,兩者均為優(yōu)質(zhì)的烴源巖;但有機(jī)碳含量相差甚大。牛蹄塘組頁巖礦物組成主要為石英,其次為黏土礦物,而太原-山西組頁巖以富集黏土礦物為特征。牛蹄塘組頁巖比表面積和吸附氣量大于太原-山西組頁巖;而總孔體積和平均孔徑均小于后者。頁巖巖石組成與吸附氣量之間的關(guān)系如下:牛蹄塘組頁巖TOC與吸附氣量呈正相關(guān)關(guān)系且TOC是吸附氣量的主要影響因素;而太原-山西組頁巖TOC與吸附氣量之間關(guān)系不明顯。牛蹄塘組頁巖石英與吸附氣量呈正相關(guān)性,其原因是石英為生物成因,伴隨有機(jī)質(zhì)富集;而太原-山西組頁巖石英與吸附氣量具有負(fù)相關(guān)性,其原因?yàn)門OC和黏土礦物隨石英的增加而減少,且TOC、黏土礦物與吸附氣量呈正相關(guān)關(guān)系。牛蹄塘組頁巖伊利石和太原-山西組頁巖黏土礦物均與吸附氣量具有正相關(guān)性,原因?yàn)轲ね恋V物吸附有機(jī)質(zhì)且黏土礦物中各組分發(fā)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.
【作者單位】： 中國地質(zhì)大學(xué)(北京)能源學(xué)院;頁巖氣勘查與評價國土資源部重點(diǎn)實(shí)驗(yàn)室;河南地質(zhì)調(diào)查研究院;銅仁中能天然氣有限公司;
【基金】：國家自然科學(xué)基金(41102088)資助
【分類號】：P618.13

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