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首页> 外文学位 >Depositional environment and facies architecture of the Lower to Middle Ordovician carbonate ramp succession, Oland, southern Sweden.
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Depositional environment and facies architecture of the Lower to Middle Ordovician carbonate ramp succession, Oland, southern Sweden.

机译：下奥陶纪碳酸盐岩坡道演替的沉积环境和相结构，瑞典南部奥兰。

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摘要

The Lower to Middle Ordovician carbonates of Oland, southern Sweden, exhibit outcrops of up to 12 m thickness and rest conformably on Cambrian black shales of the Alum Formation. Based on lithological and sedimentological characteristics, nine carbonate facies were identified within the successions that are grouped into four facies associations (FAs). FA 1 is composed of glauconite- bearing mud- to wackestone facies. FA 2 consists of three glauconite- and one glauconite- and Fe-ooid bearing mud- to packestone carbonate facies. Deposits of FA 3 are carbonate mud- to wackestone facies. FA 4 is characterized by one Fe- ooid bearing and four other mud- to packstone carbonate facies.;The studied carbonate succession is subdivided into three stratigraphic units referred to as Intervals 1 to 3. Interval 1 consists of the Kopingsklint and Bruddesta Formations located at the base of the succession. Interval 2 is composed of the Horns Udde formation in the middle level of the succession, and Interval 3 is characterized by the Gillberga Formation situated at the top of the succession.;FA 1 rocks were deposited in an offshore proximal setting, whereas FA 2 records an offshore distal setting during "starved" times. FA 3 and FA 4 rocks were deposited during the "normal" times reflecting offshore proximal and distal settings, respectively.;Heterozoan assemblages, allochthonous Fe- ooids, and abundance of carbonate mud within the facies suggest that the studied carbonate succession experienced temperate to sub-tropical sea-water conditions during deposition despite its paleo-latitudes equivalence to what would be temperate to cool-water environments of modern examples.;Three 3rd order sequences having regressive systems tracts (RSTs) and transgressive systems tracts (TSTs) bounded by maximum regressive surfaces (MRSs) were determined within the studied succession based on the transgressive versus regressive sequence stratigraphic model. The MRSs are situated at the top of the RSTs reflecting maximum sea-level drops. Interval 1 is interpreted to represent both TST and RST characterized by glauconite-bearing facies, and have a sequence boundary (MRS) at the base. Interval 2 contains two sequence boundaries (MRSs) and is comprised of two TST and one RST characterized by carbonate facies. Interval 3 has a sequence boundary (MRS) at the top and is composed of one RST discriminated by glauconite-bearing facies.;The Lower to Middle Ordovician carbonates and their subsurface equivalence have high potential in terms of conventional and unconventional petroleum exploration based on their lithologic character and positions in the Paleozoic petroleum system in the Baltic Sea of Scandinavia and adjacent areas.
机译：瑞典南部奥兰的奥陶纪中低层碳酸盐岩露头厚达12 m，并适当地分布在明矾岩层的寒武纪黑色页岩上。根据岩性和沉积学特征，在演替过程中确定了9个碳酸盐相，这些相分为四个相协会（FAs）。 FA 1由含钙铝矾石的泥质至砂泥岩相组成。 FA 2包括3个青绿岩和1个青绿岩和含铁卵石的泥质至Packestone碳酸盐岩相。 FA 3的沉积物是碳酸盐泥质至砂泥岩相。 FA 4的特征是一个含Feooid的岩相和其他四个泥浆至膏状的碳酸盐岩相。;研究的碳酸盐岩演替细分为三个地层单元，称为区间1至3。区间1由位于该区的Kopingsklint和Bruddesta地层组成。继承的基础。间隔2由演替层中段的Horns Udde地层组成，间隔3的特征是位于演替层顶部的Gillberga地层.FA 1岩石沉积在近海近端环境中，而FA 2记录“饥饿”时期的近海远侧环境。 FA 3和FA 4岩石分别在“正常”时间内沉积，分别反映了近海和远海的环境。；相中的杂类动物组合，异质类飞石和丰富的碳酸盐泥浆表明所研究的碳酸盐岩演替经历了温带至亚热带。尽管其古纬度相当于现代例子的凉水环境温和，但沉积过程中的热带海水条件；；三个三阶序列，其回归系统域（RSTs）和海侵系统域（TSTs）以最大值为界回归面（MRS）是在基于海侵序列与逆序层序地层学模型的研究演替中确定的。 MRS位于RST的顶部，反映最大的海平面下降。区间1被解释为代表TST和RST，其特征是含青灰岩相，并且在基底处具有序列边界（MRS）。区间2包含两个序列边界（MRS），由两个TST和一个以碳酸盐相为特征的RST组成。区间3的顶部具有一个层序边界（MRS），由一个由辉石岩相识别的RST组成。低奥陶纪至中奥陶纪碳酸盐及其地下等效物在常规和非常规石油勘探方面均具有很高的潜力斯堪的纳维亚半岛波罗的海及其邻近地区的古生代石油系统的岩性特征和位置。

著录项

  • 作者

    Cigri, Ali Riza.;

  • 作者单位

    Colorado State University.;

  • 授予单位 Colorado State University.;
  • 学科 Geology.;Sedimentary Geology.;Petroleum Geology.
  • 学位 M.S.
  • 年度 2014
  • 页码 69 p.
  • 总页数 69
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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