【摘要】：鄂爾多斯盆地三疊系延長(zhǎng)組優(yōu)質(zhì)烴源巖的形成可能與熱流體活動(dòng)密切相關(guān),但一直缺乏直觀且有效的證據(jù)支持。通過(guò)連續(xù)采樣的高分辨率元素地球化學(xué)研究,結(jié)果顯示延長(zhǎng)組整體上是具有較多陸源輸入的非典型熱水沉積,但在長(zhǎng)7-3段優(yōu)質(zhì)烴源巖沉積期熱流體輸入顯著增強(qiáng)。熱液指標(biāo)Al/(Al+Fe+Mn)、(Fe+Mn)/Ti比值與TOC豐度之間的相關(guān)系數(shù)分別高達(dá)-0.89和0.89,表明熱水沉積與烴源巖之間具有密切關(guān)系,即熱液輸入強(qiáng)度越大,烴源巖有機(jī)質(zhì)豐度越高。Al/(Al+Fe+Mn)比值與P/Al、P/Ti、TS含量的相關(guān)系數(shù)分別為-0.81、-0.80和-0.89,指示熱水沉積與烴源巖之間存在的關(guān)系可能緣于熱水活動(dòng)能夠促進(jìn)湖面古生產(chǎn)力的提高和底水缺氧環(huán)境的形成,在烴源巖發(fā)育過(guò)程中提供充足的有機(jī)質(zhì)來(lái)源和良好的有機(jī)質(zhì)保存條件。研究表明,熱水沉積是潛在的富有機(jī)質(zhì)烴源巖,元素定量指標(biāo)相關(guān)性分析是揭示兩者之間關(guān)系的一種有效途徑。
[Abstract]:The formation of high quality source rocks of the Triassic Yanchang formation in Ordos Basin may be closely related to the thermal fluid activity, but there is a lack of direct and effective evidence. Through the continuous sampling of high resolution element geochemistry, the results show that the Yanchang formation is an atypical hot water deposit with more terrestrial inputs, but the thermal fluid input increased significantly during the sedimentary period of the high quality hydrocarbon source rocks of the Chang 7-3 member. The correlation coefficients between hydrothermal index Al/ (Al Fe Mn), (Fe Mn) / Ti ratio and TOC abundance are as high as -0.89 and 0.89 respectively, which indicates that hydrothermal deposition has a close relationship with source rock, that is, the greater the hydrothermal input intensity, The higher the organic matter abundance of source rocks, the higher the ratio of 路Al / (Al Fe Mn) and the correlation coefficient of P / AlP / TiTs content are -0.81- 0.80 and -0.89respectively, indicating that the relationship between hot water deposition and source rocks may be due to the hot water activity can promote the improvement of paleoproductivity and the bottom of the lake surface. The formation of anoxic water environment, Adequate organic matter sources and good preservation conditions are provided during the development of source rocks. The results show that hot water deposition is a potential source rock with rich organic matter and the correlation analysis of element quantitative indexes is an effective way to reveal the relationship between them.
【作者單位】： 中國(guó)科學(xué)院地質(zhì)與地球物理研究所油氣資源研究重點(diǎn)實(shí)驗(yàn)室;甘肅省油氣資源研究重點(diǎn)實(shí)驗(yàn)室;中國(guó)科學(xué)院大學(xué);中國(guó)地質(zhì)大學(xué)(武漢)構(gòu)造與油氣資源教育部重點(diǎn)實(shí)驗(yàn)室;中國(guó)石油長(zhǎng)慶油田分公司勘探開發(fā)研究院;低滲透油氣田勘探開發(fā)國(guó)家工程實(shí)驗(yàn)室;
【基金】：中國(guó)科學(xué)院戰(zhàn)略性先導(dǎo)科技專項(xiàng)(XDB10010103) 國(guó)家自然科學(xué)基金項(xiàng)目(41172131,41672137) 甘肅省重點(diǎn)實(shí)驗(yàn)室專項(xiàng)(1309RTSA041)
【分類號(hào)】：P618.13
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本文編號(hào)：2161196