岑巩页岩气区块牛蹄塘组黑色页岩稀土元素地球化学特征及沉积环境分析
发布时间：2019-06-24 17:42
【摘要】：岑巩页岩气区块发育牛蹄塘组黑色页岩是一套优质烃源岩,是我国页岩气勘探开发亟待突破的重点层系之一。对该套黑色页岩采用电感耦合等离子体质谱仪(ICPMS)进行稀土元素(REE)测试分析,以揭示黑色页岩沉积环境。结果表明:总体上稀土元素总量较低(ΣREE为72.64×10~(-6)~156.98×10~(-6)),LREE相对富集(LREE/HREE为5.22~11.8),铕负异常较显著(δEu为0.40~0.58),铈呈弱负异常(δCe为0.74~0.98)。研究区黑色页岩母岩为先期沉积岩,形成于被动大陆边缘的相对较深的浅海斜坡环境;在早寒武世曾发生过一次明显的海侵-海退过程;沉积时水体为弱还原缺氧环境,沉积过程中有一个短暂的充氧期;沉积过程受到较强的热水作用的影响,上部和下部沉积速率低于中部;黑色页岩有机碳含量(TOC)与ΣREE存在较为明显的负相关性。对岑巩页岩气区块牛蹄塘组黑色页岩稀土元素地球化学分析,可为该区块进一步开展页岩气勘探开发工作提供参考。
[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，
本文编号：2505241
[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，
本文编号：2505241
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