【摘要】：岑鞏頁巖氣區(qū)塊發(fā)育牛蹄塘組黑色頁巖是一套優(yōu)質(zhì)烴源巖,是我國頁巖氣勘探開發(fā)亟待突破的重點(diǎn)層系之一。對該套黑色頁巖采用電感耦合等離子體質(zhì)譜儀(ICPMS)進(jìn)行稀土元素(REE)測試分析,以揭示黑色頁巖沉積環(huán)境。結(jié)果表明:總體上稀土元素總量較低(ΣREE為72.64×10~(-6)~156.98×10~(-6)),LREE相對富集(LREE/HREE為5.22~11.8),銪負(fù)異常較顯著(δEu為0.40~0.58),鈰呈弱負(fù)異常(δCe為0.74~0.98)。研究區(qū)黑色頁巖母巖為先期沉積巖,形成于被動大陸邊緣的相對較深的淺海斜坡環(huán)境;在早寒武世曾發(fā)生過一次明顯的海侵-海退過程;沉積時水體為弱還原缺氧環(huán)境,沉積過程中有一個短暫的充氧期;沉積過程受到較強(qiáng)的熱水作用的影響,上部和下部沉積速率低于中部;黑色頁巖有機(jī)碳含量(TOC)與ΣREE存在較為明顯的負(fù)相關(guān)性。對岑鞏頁巖氣區(qū)塊牛蹄塘組黑色頁巖稀土元素地球化學(xué)分析,可為該區(qū)塊進(jìn)一步開展頁巖氣勘探開發(fā)工作提供參考。
[Abstract]:The black shale of Niujiitang formation in Cen Gongshale gas block is a set of high quality source rocks, which is one of the key strata to be broken through in shale gas exploration and development in China. The rare earth element (REE) was measured and analyzed by inductively coupled plasma mass spectrometer (ICPMS) in order to reveal the deposition environment of black shale. The results show that the total amount of rare earth elements is low (危 REE is 72.64 脳 10 ~ (- 6) ~ 156.98 脳 10 ~ (- 6), LREE (LREE/HREE is 5.22 鈮，

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