吐哈盆地大河沿地区塔尔朗组细粒沉积岩特征

发布时间：2018-04-25 05:40

本文选题：细粒沉积岩 + 岩相特征　；参考：《沉积学报》2017年04期

【摘要】：通过野外露头详细观察、薄片鉴定、X射线衍射分析、微量元素分析等技术,对大河沿地区塔尔朗组细粒沉积岩矿物成分、沉积构造、岩性岩相类型及沉积环境进行研究。结果表明:塔尔朗组细粒沉积岩矿物成分以石英和方解石为主,含少量长石及黏土矿物;沉积构造类型包括较强水动力下的粒序层理、小型交错层理、脉状层理以及静水环境下的纹层状构造;以颜色、矿物成分、沉积构造等因素为依据将细粒沉积岩划分为5种岩相,包括灰黑色薄层状混合细粒岩相、深黑色页状黏土岩相、灰黑色纹层状混合细粒岩相、灰色薄层状粉砂岩相、灰白色页状灰岩相;岩石类型包括碳酸盐岩类、细粒长英沉积岩类、细粒混合沉积岩类3种岩石类型。塔尔朗组细粒沉积岩沉积期温暖湿润,整体上属于还原的半咸水—咸水湖盆的产物。
[Abstract]:The mineral composition, sedimentary structure, lithologic lithofacies type and sedimentary environment of fine sedimentary rock of Talang formation in Daheyan area were studied by means of detailed field outcrop observation, X-ray diffraction analysis and trace element analysis. The results show that the mineral composition of the fine grained sedimentary rocks of the Talang formation is mainly quartz and calcite, with a small amount of feldspar and clay minerals, and the sedimentary structural types include the grain-sequence bedding and the small-scale interlaced bedding under strong hydrodynamic forces. According to color, mineral composition and sedimentary structure, fine-grained sedimentary rocks are divided into five kinds of lithofacies, including gray-black thin-layer mixed fine-grained facies, deep black lamellar clay facies, etc. The gray-black lamellar mixed fine grained facies, grey thin-layer siltstone facies, gray-white leaf limestone facies, and the rock types include carbonate rocks, fine-grained feldspathic sedimentary rocks and fine-grained mixed sedimentary rocks. The fine grain sedimentary rocks of the Talang formation were warm and humid during the sedimentary period, which was the product of the reduced brackish water-salt lake basin.
【作者单位】：中国石油大学(华东)地球科学与技术学院;中石化胜利油田分公司勘探开发研究院西部分院;
【基金】：国家自然科学基金项目(41072164)~~
【分类号】：P618.13

【参考文献】