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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。
Based on the core and water sample data of drilling cores and water samples from Gaoshiti-Moxi area in Sichuan Basin, the outcrop data of surface profile around the basin are supplemented. The petrology and geochemical analysis were carried out by means of trace elements, cathodoluminescence, inclusions and isotope analysis Based on this, the change of diagenesis and the evolution of pore fluid during the diagenesis are discussed. The results show that the carbonate sediments of Dengying Formation are widely influenced by pore fluid and diagenesis during sedimentation and diagenesis, cementation of seawater, early diagenesis of atmospheric diagenesis (dissolution and sedimentation) Karstification, tectono-control of hydrothermal dolomitization and Mississippi valley mineralization, dissolution during hydrocarbon generation, and pore filling of pyrophyllite during oil-thermal cracking, among which karstification and hydrothermal dolomitization The development of the reservoir plays an important role. However, Lamplight pore fluids are extensively modified by dolomitization and karstification. Current analysis of formation water data shows that these diagenesis clearly affect formation water fluids that evaporate seawater. The data of formation water analysis shows the characteristics of evaporating seawater in the relationship chart of Ca-Br and Mg-Br. The concentration of Ca is higher than that of evaporating seawater, and the concentration of Mg is lower than that of evaporating seawater, The result of dolomitization occurred during the action.