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Earth & Life (http://www.geofinds.com), 2006-10-1, Vol.1. , No.1: 46-59
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Upper Permian reefs and dolostones in some wells in eastern Sichuan Province
Abstract Cores from 8 wells in eastern Sichuan Provinces were studied. The studied intervals from Well Tie-5, Well Tiandong-10 are typical reef facies. The cores from Well Bandong-4 and well Shuang-15 include reef facies and crinoidal bank facies. The samples from Well Wo-117 and Yunan-14 are basically carbonate platform facies. Cores from Well Chi-24 include two reef facies: calcisponge framestone and calcisponge bafflestone. The dolostones from these wells have an origin related to mixing of fresh water and seawater. They suffered later dolomitization in deep burial stage. So they show geochemical features of both deep burial and mixing-water dolomitization. The precursor rock of dolostones can be reef framestone, crinoidal bank facies limestone, and even carbonate platform facies. So, besides reef derived dolostones, bank derived and platform derived dolostones are also important target during exploration. Keywords: Reef; dolostone; dolomitization; Sichuan Province; core
In Chinese:
四川东部上二叠统长兴组钻井岩心的生物礁相及其白云石化作用
1. 中国科学院地质与地球物理研究所，北京 100029
摘 要 通过对四川东部8口井二叠纪长兴期钻井岩心的详细研究，铁5井，天东10井，代表典型的礁相剖面；板东4井，双15井既有礁相沉积，又有棘屑滩沉积；卧117井以及云安14井基本上由碳酸盐台地沉积组成；池24井出现两种类型的礁相：海绵骨架礁和海绵障积礁。川东礁相剖面中的白云岩以海水与淡水混合作用形成的白云石化为主导因素。但它们在深埋阶段以后又遭受后期白云石化的叠加，因此表现出许多深埋白云石化的地化特征。白云岩的原始沉积既可以是礁骨架岩，也可能是棘屑滩，甚至是碳酸盐台地沉积。因此在寻找礁型白云岩储层时，还应注意滩相白云岩储层以及一般的碳酸盐台地白云岩储层.
关键词 二叠纪 ；生物礁；白云岩；四川；白云石化 |
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TO 46,47,48,49,50,51,52,53,54,55,56,57,58,59
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