【摘要】：鄂爾多斯盆地延長組7段富含大量頁巖油,但由于對頁巖與泥巖特征差異缺乏深入了解,阻礙了該層系頁巖油的有效開發(fā)。為此,采用巖心觀察、薄片鑒定等直接觀察手段與XRD、Rock-Eval、TOC、氯仿瀝青"A"抽提、主微量元素等實驗相結(jié)合,對研究區(qū)長7段頁巖和泥巖的巖石學、礦物學、有機地球化學與無機地球化學特征進行了深入研究。結(jié)果表明:長7段頁巖的顏色較深,發(fā)育明顯頁理,切面光滑,而泥巖不具有紋層和頁理,斷口不整齊且切面粗糙;頁巖的有機質(zhì)以順層富集為主,泥巖有機質(zhì)以分散賦存為主;頁巖的粘土礦物含量較高,泥巖的石英含量較高;頁巖的TOC平均值為18.5%,約為泥巖的5倍,生烴潛量是泥巖的5~8倍;氯仿瀝青"A"組分對比顯示頁巖含較多的芳烴,泥巖則含有較多的飽和烴;頁巖沉積水體的鹽度相對泥巖略低,且水深相對較淺。長7段頁巖呈西北-東南走向分布,厚度主要為15~30 m,與泥巖呈互補式分布。頁巖油"源內(nèi)聚集"的特點使長7段的頁巖油宏觀分布受到頁巖相控制。開展泥巖與頁巖的對比研究,對準確預測富有機質(zhì)頁巖分布及指導頁巖油氣勘探具有重要意義。
[Abstract]:Member 7 of Yanchang formation in Ordos Basin is rich in shale oil, but the lack of in-depth understanding of the characteristics of shale and mudstone hinders the effective development of shale oil in this formation. Therefore, the petrology and mineralogy of shale and mudstone in Chang7 member of the study area were studied by combining core observation and thin slice identification with XRD,Rock-Eval,TOC, chloroform asphalt "A" extraction and main trace elements. The characteristics of organic geochemistry and inorganic geochemistry were deeply studied. The results show that the shale of Chang 7 member is dark in color, has obvious paging and smooth section, but the mudstone does not have grain and page, and the fracture surface is irregular and the section is rough. The organic matter of shale is mainly enriched by bedding, the organic matter of mudstone is mainly dispersed, the clay mineral content of shale is higher, and the quartz content of mudstone is higher. The average TOC of shale is 18.5%, which is about 5 times of that of mudstone, and the hydrocarbon generation potential is 5 鈮，

本文編號：2492876