塔里木盆地中-下奥陶统鹰山组层序地层格架中的成岩作用——以塔河地区和柯坪巴楚露头区为例

发布时间：2018-01-08 16:03

本文关键词：塔里木盆地中-下奥陶统鹰山组层序地层格架中的成岩作用——以塔河地区和柯坪巴楚露头区为例　出处：《石油与天然气地质》2017年04期 　论文类型：期刊论文

【摘要】：塔里木盆地中-下奥陶统鹰山组内幕储层的成因机制是当前油气勘探所关注的重点。以塔河地区钻井与柯坪巴楚露头为研究对象,利用岩石学与地球化学手段,对成岩作用在准层序、准层序组以及三级层序内的发育规律与演化特征展开研究。研究认为:沉积相带对成岩作用具有明显的控制作用,海水潜流成岩作用占据潮下带,潮间带则以海水潜流、渗流以及淡水潜流成岩作用为特征,潮上带以淡水渗流胶结物、同生期大气淡水溶蚀作用为特征;退积型准层序组,准层序顶部在海平面上升早期受大气淡水影响,海水成岩作用则在晚期主导旋回顶部;进积型准层序组,准层序在高水位早期以海水成岩作用为主,直至晚期顶部出现暴露;鹰山组下亚段三级层序,海平面上升期以同生期淡水成岩作用为特征,同时下倾方向胶结作用增加,高水位末期发育较弱的喀斯特;下亚段三级层序中的埋藏白云岩化作用发育强烈,云化流体以原生海水为主;上亚段三级层序在海泛面附近发育广泛海水胶结作用,快速的海侵使得同生期淡水成岩作用发育较弱,高水位期,受裂缝控制的表生溶蚀现象普遍存在。
[Abstract]:The genetic mechanism of the Insider Reservoir of Yingshan formation in the Middle and Lower Ordovician in Tarim Basin is the focus of oil and gas exploration at present. Taking drilling and Kepingbachu outcrop in Tahe area as the research object, petrology and geochemistry are used. The development and evolution characteristics of diagenesis in the quasequence, quasequence and tertiary sequences are studied. It is concluded that sedimentary facies belts have obvious controlling effect on diagenesis. The subtidal diagenesis occupies the subtidal zone, while the intertidal zone is characterized by seawater undercurrent, percolation and freshwater undercurrent diagenesis, and the upper tidal zone is characterized by freshwater percolation cementation and syngenic atmospheric freshwater dissolution. The retrogressive quasi-sequence formation, the top of which is influenced by atmospheric fresh water in the early stage of sea level rise, and the top of the oceanic diagenesis in the late stage. During the early period of high water level, the diagenesis of sea water was the main factor, until the top of the late stage was exposed. The third order sequence of the lower submember of the Yingshan formation is characterized by the syngenic pale water diagenesis in the rising sea level, at the same time the cementation in the downdip direction is increased, and the karst which develops weakly at the end of the high water level; The buried dolomitization in the third-order sequence of the lower submember is strongly developed, and the clouded fluid is dominated by primary seawater. The tertiary sequence of the upper submember developed extensive sea water cementation near the flooding surface, and the rapid transgression resulted in the weak development of the synzogenic fresh water diagenesis, and in the high water level period, the phenomenon of surface corrosion controlled by the cracks was widespread.
【作者单位】：中国地质大学(北京)能源学院;中国地质大学(北京)海相储层演化与油气富集机理教育部重点实验室;中国石油辽河油田分公司勘探开发研究院;
【基金】：国家自然科学基金项目(41102087) 国家重点基础研究发展计划(973计划)项目(2012CB214802)
【分类号】：P534.42;P618.13
【正文快照】： 以往对于区域性不整合及其控储作用的研究,指导了目前塔里木盆地海相碳酸盐岩储层的油气勘探[1-2],这一类区域性不整合往往对应一级层序和二级层序,与长周期构造控制的海平面变化有关。随着勘探的深入,中-下奥陶统鹰山组内幕储层的成因逐渐成为关注的重点。然而,在塔里木盆地,

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