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首页> 外文学位 >Stratigraphy, Sedimentology and Reservoir Characterization of an Inner Platform Carbonate-Evaporite Sequence: the Late Devonian Duperow Formation of Southeastern Saskatchewan, Canada.
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Stratigraphy, Sedimentology and Reservoir Characterization of an Inner Platform Carbonate-Evaporite Sequence: the Late Devonian Duperow Formation of Southeastern Saskatchewan, Canada.

机译：内部平台碳酸盐-蒸发岩层序的地层学，沉积学和储层特征：加拿大萨斯喀彻温省东南部的晚泥盆纪Duperow组。

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摘要

The Duperow Formation in Southeastern Saskatchewan forms the lower part of Saskatchewan Group. Stratigraphic review of the formation reveals that it consists of three members: Saskatoon, Wymark and Seward, in ascending order. Sedimentological and petrographic analysis of cores and samples from these three members recognizes nine lithofacies: bioclastic wackestone/packstone (Lf1), stromatoporoid floatstone/bafflestone (Lf2), Amphipora floatstone/bafflestone (Lf3), nodular peloidal wackestone/packstone (Lf4), argillaceous dolomudstone (Lf5), dolomitic mudstone (Lf6), microbially laminated dolowackestone (Lf7), anhydrite (Lf8) and halite (Lf9). These nine lithofacies are further grouped into five lithofacies associations (LFA-I to LFA-V) that can be organized into the following five major depositional environments: 1) normal marine subtidal, 2) stromatoporoid bank/mound, 3) restricted inter-tidal mudflat to lagoonal, 4) more restricted intertidal and 5) supratidal.;The major diagenetic processes of the Duperow Formation include micrite envelope and micritization, calcite cementation, dolomitization, compaction, dissolution, anhydrite cementation and fractures. Dolomitization and dissolution are the major factors responsible for the increase of porosity. Calcite cementation and anhydrite cementation contributed to destruction of porosity, and, therefore, reduction of the reservoir quality of the rocks. The stromatoporoid floatstone/bafflestone lithofacies (Lf2) and the microbially laminated dolowackestone lithofacies (Lf1) contain an appreciable amount of porosity resulting in fair reservoir qualities. Visible porosity identified in these two lithofacies varies from about 3% to 10% and consists of vuggy, intercrystalline, moldic and intraparticle porosities. Of these, the intercrystalline and primary intraparticle porosities are the most abundant and common types. The reservoir quality in the Duperow Formation in southeastern Saskatchewan is different from that in North Dakota where it forms the second most prolific oil-producing unit. The degree of dolomitization might be an important reason. In North Dakota, the relationship between the distribution of dolomite porosity and reservoir quality is the result of dolomitization localized adjacent to fracture/fault systems. A similar dolomitization scenario might be attributed to the locally dolomitized zones of southeastern Saskatchewan.
机译：萨斯喀彻温省东南部的Duperow组形成了萨斯喀彻温省群的下部。对该地层进行地层学审查后发现，它由三个成员组成，依次为萨斯卡通，怀马克和苏厄德。对这三个成员的岩心和样品进行沉积学和岩石学分析，可识别出九种岩相：生物碎屑沃克石/堆积石（Lf1），层间多孔浮石/挡板石（Lf2），安菲拉浮石/挡板石（Lf3），结核状瓦基石/堆积石（Lf4）白云岩（Lf5），白云质泥岩（Lf6），微生物层状的dolowackestone（Lf7），硬石膏（Lf8）和盐岩（Lf9）。这9个岩相被进一步分为5个岩相协会（LFA-1至LFA-V），这些协会可以组织成以下5个主要沉积环境：1）正常的海底潮汐； 2）层间孔岸/土丘； 3）潮间带受限。泥滩至泻湖，4）潮间带受限制，5）潮间带。； Duperow组的主要成岩作用包括石包裹和微粉化，方解石胶结，白云石化，压实，溶解，硬石膏胶结和裂缝。白云石化和溶解是导致孔隙度增加的主要因素。方解石胶结作用和硬石膏胶结作用破坏了孔隙度，因此降低了岩石的储层质量。层状孔隙浮石/挡板岩岩相（Lf2）和微生物层压的道洛基石岩相（Lf1）包含相当数量的孔隙度，从而导致储层质量良好。在这两个岩相中识别出的可见孔隙度大约在3％至10％之间，并且由孔隙，晶间，霉菌和颗粒内孔隙组成。其中，晶间和初级颗粒内孔隙度是最丰富和常见的类型。萨斯喀彻温省东南部的Duperow组的储层质量与北达科他州的储层质量不同，后者是第二多产的产油单元。白云石化程度可能是重要的原因。在北达科他州，白云岩孔隙度的分布与储层质量之间的关系是位于裂缝/断层系统附近的白云石化作用的结果。类似的白云石化情景可能归因于萨斯喀彻温省东南部的局部白云石化带。

著录项

  • 作者

    Cen, Xiaochun.;

  • 作者单位

    The University of Regina (Canada).;

  • 授予单位 The University of Regina (Canada).;
  • 学科 Geology.;Sedimentary Geology.
  • 学位 M.Sc.
  • 年度 2010
  • 页码 192 p.
  • 总页数 192
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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