四川盆地川中地区震旦系灯影组热液白云岩储集相

发布时间：2018-05-01 18:16

  本文选题：四川盆地中部 + 热液白云岩储集相　； 参考：《天然气工业》2017年03期

【摘要】：四川盆地中部(简称川中地区)上震旦统灯影组是近几年该盆地天然气勘探的重点目标之一,尤其是表生岩溶作用及其所形成的储渗空间一直是相关研究的重点。为此,以岩心、岩屑样品的岩石学特征研究为基础,结合相关微量元素、同位素和阴极发光等实验分析结果,证实灯影组白云岩中发育有基质重结晶白云岩、充填状鞍状白云石(包裹体均一化温度平均值为178.5℃、高Fe、Mn含量、~(87)Sr/~(86)Sr值偏高)和热液矿物组合(包括闪锌矿、方铅矿、黄铁矿、石英等)。进而提出该区灯影组白云岩中存在热液白云岩储集相的认识,即指由热液流体对致密基质白云岩改造而形成的由热液溶蚀孔隙、热液成因晶间孔、热液溶洞、热液扩溶缝4种储集空间构成的白云岩储集体。为有效地认识和鉴别灯影组热液白云岩储集相,从岩相学和地球化学两方面建立了鉴别标志。结论认为,该区热液白云岩储集相发育的控制因素为:(1)深大基底断裂作用;(2)热液作用强度。
[Abstract]:The Dengying formation of the Upper Sinian in the central part of Sichuan Basin is one of the key targets of natural gas exploration in this basin in recent years, especially the supergene karstification and its reservoir and seepage space. Therefore, based on the petrological characteristics of core and cuttings, combined with the experimental results of trace elements, isotopes and cathodoluminescence, it is proved that the matrix recrystallized dolomite is developed in the dolomite of the Dengying formation. The packed saddle dolomite (the average temperature of homogenization of inclusions is 178.5 鈩，

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