孙梦迪;于炳松;夏威;祁青山;叶若辰;

• 1:中国地质大学(北京)地球科学与资源学院

• 2:中国地质大学(北京)地质过程与矿产资源国家重点实验室

摘要(Abstract)：

为恢复渝东南地区下志留统底部黑色岩系沉积环境,研究有机质富集机制,对重庆市彭水县鹿角剖面进行系统采样,并测试有机碳质量分数、全岩X线衍射、微量元素、比表面和孔径分析等.结果表明:鹿角剖面下志留统底部黑色岩系属于中成岩阶段B期,古盐度在11.1‰~35.4‰之间,平均为21.4‰,整体上属于多盐水.样品中w(V)/w(Cr)在1.62~3.72之间,w(V)/w(V+Ni)主体在0.80左右,并结合黑色岩系中V、Ni、Cu的富集程度与总有机碳质量分数的良好正相关性,说明沉积环境处于水体呈弱分层的缺氧环境.随着深度变浅沉积环境由次还原向次氧化、氧化过渡.上升洋流导致古生产力提高,到志留纪时期全球气候变暖,上升洋流随之减弱,古生产力也随之逐渐降低.高古生产力是有机质富集的首要条件,高水体盐度、缺氧环境是有机质保存的理想环境.有机碳质量分数与岩石的BET比表面和总孔体积呈良好的正相关性,说明沉积环境在一定程度上影响岩石的储集物性,从而影响页岩气的赋存空间.

关键词(KeyWords)：沉积环境;有机质富集;黑色岩系;下志留统;鹿角剖面;渝东南地区

Abstract:

Keywords:

基金项目(Foundation):高等学校博士学科点专项科研基金项目(20120022130001);; 国土资源部全国页岩气资源战略调查项目(2009GYXQ15-04)

作者(Author):孙梦迪;于炳松;夏威;祁青山;叶若辰;

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