本文選題：柴達(dá)木盆地北緣 + 頁(yè)巖氣��； 參考：《長(zhǎng)安大學(xué)》2015年碩士論文

【摘要】：本文較為系統(tǒng)的對(duì)柴達(dá)木盆地北緣中侏羅統(tǒng)石門溝組(J2s)和大煤溝組(J2d)泥頁(yè)巖的分布特征、地球化學(xué)特征、埋深特征、礦物組成、儲(chǔ)集性能、含氣性等頁(yè)巖氣成藏條件進(jìn)行了全面的研究。結(jié)果表明石門溝組富有機(jī)質(zhì)泥頁(yè)巖厚度在50~250m之間,分布范圍廣,埋深差異性較大;有機(jī)質(zhì)豐度高,有機(jī)碳含量普遍較高,平均為4.63%,最高達(dá)17.05%,有機(jī)質(zhì)類型以Ⅰ-Ⅱ2型為主;大煤溝組泥頁(yè)巖厚度在20~100m之間,有機(jī)碳含量高,平均為5.2%,最高達(dá)21.76%,有機(jī)質(zhì)類型以Ⅱ1-Ⅲ型為主;兩組泥頁(yè)巖熱演化程度以低成熟階段為主,個(gè)別地區(qū)達(dá)到高成熟階段。石門溝組泥頁(yè)巖中,石英含量平均為27.6%,粘土礦物含量平均為35.7%;孔隙度分布在1.5%~15.6%之間,平均為7.1%,滲透率分布在0.003×10-3μm2~6.24×10-3μm2,平均為0.296×10-3μm2。大煤溝組泥頁(yè)巖中石英含量平均為36.98%,粘土礦物含量平均為56.5%;孔隙度分布在1.8%~9.2%之間,平均為4.9%,滲透率分布在0.002×10-3μm2~0.3μm2,平均為0.185×10-3μm2。泥頁(yè)巖中微孔隙主要發(fā)育有:有粒間孔隙、溶蝕孔隙、頁(yè)巖層間孔隙、有機(jī)質(zhì)納米孔和生屑內(nèi)體腔孔;裂隙較為發(fā)育,且以微裂隙為主。通過現(xiàn)場(chǎng)解吸實(shí)驗(yàn)、直線法和多項(xiàng)式曲線擬合法對(duì)石門溝組泥頁(yè)巖樣品進(jìn)行含氣性測(cè)試,解吸氣量為0.04~0.32m3/t,損失氣量0.03~0.47m3/t,殘余氣量0.04~0.08m3/t,總含氣量約0.42~0.83m3/t。通過對(duì)解吸氣體甲烷碳同位素分析,魚卡地區(qū)解吸氣體δ13C1值為-80.59‰~-61.89‰,為生物成因氣;賽南地區(qū)解吸氣體δ13C1值為-38.4‰~-39.9‰,為低溫?zé)岢梢驓?西大灘地區(qū)解吸氣體δ13C1值為-40.1‰,為熱成因氣。最后對(duì)研究區(qū)頁(yè)巖氣成藏參數(shù)與美國(guó)已商業(yè)性開發(fā)的含氣頁(yè)巖進(jìn)行對(duì)比,認(rèn)為研究區(qū)具備良好的頁(yè)巖氣成藏條件,并預(yù)測(cè)優(yōu)選出石門溝組4個(gè)遠(yuǎn)景區(qū),分別為賽南遠(yuǎn)景區(qū)、魚卡遠(yuǎn)景區(qū)、大煤溝遠(yuǎn)景區(qū)和德令哈北遠(yuǎn)景區(qū);大煤溝組2個(gè)遠(yuǎn)景區(qū),分別為潛西遠(yuǎn)景區(qū)和大煤溝遠(yuǎn)景區(qū)。
[Abstract]:In this paper, the distribution, geochemistry, buried depth, mineral composition and reservoir properties of shale in the Middle Jurassic Shimengou formation and Dawangou formation in the northern margin of the Qaidam Basin are systematically studied. The conditions of shale gas accumulation, such as gas bearing, have been studied comprehensively. The results show that the thickness of the rich organic shale in the Shimenggou formation is between 50 ~ 250m, the distribution range is wide, the depth of buried is different, the organic matter abundance is high, the organic carbon content is generally high, the average value is 4.63 and the highest is 17.05, the type of organic matter is mainly type 鈪，

本文編號(hào)：1868966