本文選題：氧化還原條件　切入點(diǎn)：有機(jī)質(zhì)富集　出處：《石油與天然氣地質(zhì)》2017年05期

【摘要】：五峰組-龍馬溪組下段為昭通示范區(qū)頁巖氣勘探開發(fā)的主要目的層段,基于A井樣品有機(jī)碳、微量元素及稀土元素的系統(tǒng)測試,結(jié)合巖石學(xué)及測井資料,系統(tǒng)分析A井黑色頁巖相關(guān)元素地球化學(xué)參數(shù)的變化特征,揭示黑色頁巖形成的氧化還原條件,探討有機(jī)質(zhì)富集機(jī)制。研究結(jié)果表明:昭通頁巖氣示范區(qū)五峰組-龍馬溪組下段Ⅰ亞段TOC含量最高,平均為3.13%,向上含量逐漸降低,且相關(guān)元素富集程度與TOC含量相關(guān)。微量元素及稀土元素等氧化還原參數(shù)指示:五峰組-龍馬溪組下段,縱向上水體整體由厭氧還原環(huán)境向次氧化環(huán)境過渡,Ⅰ亞段為貧氧-厭氧環(huán)境,Ⅱ亞段為貧氧環(huán)境,Ⅲ亞段為貧氧-富氧環(huán)境。其中,Ⅰ-1小層、Ⅰ-3及Ⅰ-4小層水體還原性強(qiáng)于Ⅰ-2小層與I-5小層。在高古生產(chǎn)力背景下,五峰組與龍馬溪組黑色頁巖有機(jī)質(zhì)富集的氧化還原環(huán)境形成機(jī)制存在差異。五峰組為水體滯留形成厭氧-貧氧環(huán)境使有機(jī)質(zhì)有效保存,龍馬溪組底部則主要由于海平面上升形成厭氧環(huán)境而使有機(jī)質(zhì)有效保存富集。五峰組-龍馬溪組下段I亞段有機(jī)質(zhì)最為富集,為頁巖氣開發(fā)的最優(yōu)層段。
[Abstract]:The lower member of Wufeng formation and Longmaxi formation is the main target section of shale gas exploration and development in Zhaotong demonstration area. Based on the systematic testing of organic carbon, trace elements and rare earth elements in well A, combined with petrology and logging data, The variation characteristics of geochemical parameters related to black shale in well A are systematically analyzed, and the redox conditions for the formation of black shale are revealed. The results show that the TOC content of the lower member of Wufeng formation and Longmaxi formation in Zhaotong shale gas demonstration area is the highest, with an average of 3.13, and the upward content decreases gradually. The redox parameters such as trace elements and rare earth elements indicated that the water body in the lower part of the Wufeng formation and Longmaxi formation was in a longitudinal transition from anaerobic reduction environment to secondary oxidation environment, and the enrichment degree of related elements was related to the content of TOC. The water bodies of submember 鈪，

本文編號(hào)：1682793