济阳坳陷桩西埕岛地区下古生界潜山储层岩溶作用  

Karstification of Lower Paleozoic reservoir in Zhuangxi-Chengdao area, Jiyang sag, China

作　　者：林会喜[1] 

机构地区：[1]中国地质大学

出　　处：《成都理工大学学报（自然科学版）》2004年第5期490-497,共8页Journal of Chengdu University of Technology: Science & Technology Edition

基　　金：国家"十五"攻关项目(2001BA605A-09)

摘　　要：对于不整合面附近的海相碳酸盐岩来说,如果受到强烈的大气淡水的改造作用,那么对海相沉积组分改造作用的记录就会表现在87Sr/86Sr比值的显著升高和δ18O值的显著降低。作者从分析碳酸盐岩基质及充填物同位素87Sr/86Sr,δ13C,δ18O,以及各种微量元素Mg,Fe,Sr,Mn的角度出发,得出强烈的大气淡水的改造作用(古喀斯特作用或古岩溶作用)为桩西埕岛下古生界潜山储层的主要形成机理,并根据单井Sr和O同位素地球化学剖面,得出了大气淡水作用可能达到加里东不整合面之下的深度范围。If atmogenic freshwater reconstructs the marine carbonate near the plane of the unconformity, the ()^(87)Sr/()^(86)Sr of marine sedimentary component will take on higher value and the δ^(18)O will behaves lower value. From the angle of ()^(87)Sr/()^(86)Sr, δ^(13)C, δ^(18)O and accessory elements such as Mg, Fe, Sr, Mn for matrix minerals and fillings in carbonate, the paper educes the conclusion that the forming mechanism of buried-hills is mainly strong atmogenic freshwater, and ascertains the depth under the Caledonian affiliation plane of the unconformity under the influnence of atmogenic freshwater.

关 键 词：岩溶作用 碳酸盐岩 寒武-奥陶系 桩西-埕岛地区 济阳坳陷 

分 类 号：TE122.23[石油与天然气工程—油气勘探]