四川盆地川中地区震旦系灯影组碳酸盐沉积物成岩作用与孔隙流体演化

发布时间：2018-03-19 09:32

本文选题：成岩作用　切入点：喀斯特化作用　出处：《沉积学报》2017年04期 　论文类型：期刊论文

【摘要】：以四川盆地川中高石梯—磨溪地区钻井岩芯和水样资料为主,盆地周边地面剖面露头资料为辅,采用微量元素、阴极发光、包裹体、同位素等分析手段进行岩石学和地球化学分析,在此基础上讨论了灯影组碳酸盐岩的成岩作用变化和成岩作用过程中孔隙流体的演化。研究结果表明:灯影组碳酸盐岩沉积物在沉积作用和成岩作用过程中广泛地受到孔隙流体和成岩作用变化的影响,发生过海水的胶结作用、早期大气水成岩作用(溶解作用和沉淀作用)、表生喀斯特化作用、构造控制的热液白云石化和密西西比谷型矿化作用、碳氢产生时的溶解作用、油热裂解时焦沥青的充填孔洞作用等,其中喀斯特化和热液白云石化对储层的发育起着重要的作用。然而,灯影组孔隙流体广泛地被白云石化作用和喀斯特化作用的修饰。现今地层水资料分析表明这些成岩作用明显地影响蒸发海水的地层水流体。地层水分析资料在Ca-Br及Mg-Br关系图上显示出蒸发海水的特征,Ca的浓度比蒸发海水分布曲线要高,Mg的浓度比蒸发海水曲线要低,为灯影组沉积物在成岩作用过程中发生过白云石化作用的结果。
[Abstract]:The core and water samples of the Gaoshitian-Moxi area in Sichuan Basin are the main ones, and the outcrop data of the surface profile around the basin are supplemented by trace elements, catholuminescence and inclusions. Isotopic and other analytical methods for petrological and geochemical analysis, On this basis, the diagenesis changes of carbonate rocks in Dengying formation and the evolution of pore fluid during diagenesis are discussed. The results show that carbonate sediments of Dengying formation are widely used in sedimentary and diagenetic processes. The ground is affected by changes in pore fluid and diagenesis, Cementation of seawater, early atmospheric water diagenesis (dissolution and precipitation), epigenetic karst, tectonic-controlled hydrothermal dolomitization and Mississippi Valley mineralization, dissolution of hydrocarbon, The filling effect of tar pitch during oil pyrolysis, such as karst and hydrothermal dolomitization, plays an important role in reservoir development. The pore fluid of Dengying formation is extensively modified by dolomitization and karst process. The analysis of present formation water data shows that these diagenesis obviously affect the formation water fluid evaporating seawater. The formation water analysis data in Ca-Br. And the Mg-Br diagram shows that the concentration of Ca in evaporated seawater is higher than that in evaporated seawater, and the concentration of mg is lower than that in evaporated seawater. It is the result of dolomitization in the diagenesis of Dengying formation.
【作者单位】：西南石油大学;中国石油西南油气田分公司;
【基金】：国家自然科学基金项目(41202109) 四川省创新训练项目(201610615054) 中石油西南油气田分公司勘探综合研究项目(XNS14JS2013-055)~~
【分类号】：P618.13

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