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首页> 外文学位 >Sedimentology, organic petrology, organic geochemistry, and petroleum potential of the Middle Devonian Winnipegosis Formation in southwestern Manitoba, Canada.
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Sedimentology, organic petrology, organic geochemistry, and petroleum potential of the Middle Devonian Winnipegosis Formation in southwestern Manitoba, Canada.

机译：加拿大马尼托巴西南部中泥盆纪温尼伯病组的沉积学，有机岩石学，有机地球化学和石油潜力。

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摘要

The Middle Devonian Winnipegosis, Elm Point, and Ratner formations are parts of the Elk Point Group, which is a cyclical succession of carbonate and evaporite rocks that were deposited within the Hume-Dawson sequence in the Western Canada Sedimentary Basin. In Manitoba, these formations occur in the subsurface in the southwestern part of the province and are partly exposed in the Devonian outcrop belt along the eastern erosional margin of the Elk Point Basin. The lower and upper members of the Winnipegosis Formation are composed of ramp and isolated reef/platform units respectively. Within the study area, the western platform margin is approximately coincident with the Birdtail-Waskada Axis, which reflects the Precambrian Superior Boundary Zone, and the northern margin is approximately coincident with the contact between the Precambrian Uchi and English River domains, which raise the issue of tectonically controlled basin differentiation. At the end of Winnipegosis time the Elk Point Basin became restricted and the basin was filled by interlaminated carbonate and anhydrite of the Ratner Formation followed by the deposition of anhydrite, halite, and bittern salts (Muskeg and Prairie Evaporite formations) as a result of evaporative drawdown.; Based on detailed core examination, fifteen lithofacies have been recognized in the Winnipegosis, Elm Point, and Ratner formations in the study area: (A) non-fossiliferous mudstone, (B) mottled-nodular skeletal wackestone-mudstone, (C) nodular-patterned mudstone, (D) bituminous laminite, (E) interlaminated mudstone-anhydrite, (F) massive-mottled mudstone, (G) septarian-type nodular skeletal packstone, (H) bedded-mottled peloidal packstone, (I) intraclast floatstone, (J) bituminous skeletal wackestone-floatstone, (K) peloidal-udoteacean packstone, (L) stromatoporoid floatstone, (M) coral-stromatoporoid rudstone-framestone, (N) laminated mudstone-peloidal packstone, and (O) microbial bindstone. These lithofacies have been grouped into five lithofacies associations: ramp, platform interior, platform slope, isolated reef, and basinal salina. The ramp association (lithofacies A, B, C, D) comprises the Lower Winnipegosis Member/Elm Point Formation and includes deposits of inner to mid-ramp settings as well as off-shore tidal flat islands. The platform interior association (lithofacies D, H, I, O) and platform slope association (lithofacies D, F, G, H, I, M, N, O) comprise the Upper Winnipegosis Member and include deposits of open to slightly restricted lagoonal and lower to upper slope settings respectively. The isolated reef association (lithofacies I, J, K, L, M, N, O) occurs in the Upper Winnipegosis Member isolated reef deposits and includes proto-reef, lagoonal, fore-reef, reef-crest, and reef flat deposits. The basinal salina association (lithofacies D, E) comprises the Ratner Formation.; Bituminous laminites (lithofacies D) occur in the ramp-to-platform and ramp-to-basin transitions, platform interior and platform slope successions, and in basinal successions. Based on examination of representative samples of these bituminous laminites using white and ultra-violet incident light microscopy, organic facies indicative of either normal or elevated phytoplankton productivity (blooms) were interpreted based on the maceral assemblages present. Bituminous laminites in the study area were deposited primarily as a result of elevated phytoplankton productivity; three bloom facies were identified: BL1, cyanophyte blooms; BL2, cyanophyte and Prasinophyte blooms; and BL3, calcisphere-producing phytoplankton blooms. They are best developed in stratigraphic intervals associated with changes in depositional regime including the transition from ramp-to-platform/basin and from an open to restricted basin at the end of Winnipegosis time.; Organic geochemical analyses were also conducted to evaluate the kerogen type, extent of thermal maturation and the petroleum generative potential of the bituminous laminit
机译：中泥盆纪温尼伯戈斯病，榆树角和拉特纳地层是麋鹿角组的一部分，麋鹿角组是沉积在加拿大西部沉积盆地休ume-道森层序内的碳酸盐岩和蒸发岩的周期性演替。在马尼托巴省，这些地层发生在该省西南部的地下，部分地露在沿麋鹿角盆地东部侵蚀边缘的泥盆纪露头带中。温尼伯河病组的下部和上部分别由斜坡和孤立的礁石/平台单元组成。在研究区域内，西部台地边缘大约与反映了前寒武纪上边界带的Birdtail-Waskada轴重合，而北边缘则与前寒武纪Uchi和英吉利河域之间的接触重合，这引起了问题。构造控制的盆地分化。在温尼伯病的末期，麋点盆地受到限制，盆地被拉特纳组的层状碳酸盐和硬石膏夹层填充，随后由于蒸发而沉积了硬石膏，盐岩和卤水盐（穆斯克和普里里蒸发岩）缩水。根据详细的岩心检查，在研究区域的温尼伯西斯，榆树角和拉特纳地层中已识别出15个岩相：（A）非化石质泥岩，（B）呈斑节状的骨架瓦基石-泥岩，（C）结节状-花纹泥岩，（D）沥青层状灰岩，（E）层状泥岩-硬石膏，（F）大块斑驳的泥岩，（G）隔断型结核状结石，（H）呈斑驳状的倍体结石，（I）碎屑内浮石， （J）沥青骨架瓦克石-浮石，（K）倍体-假teaceace堆积石，（L）层状孔隙浮石，（M）珊瑚-层状孔隙胶石-骨架石，（N）层状泥岩-倍体堆积石，（O）微生物黏结石。这些岩相被分为五个岩相协会：坡道，平台内部，平台斜坡，孤立的礁石和盆地盐湖。斜坡组合（岩相A，B，C，D）包括下温尼伯河段成员/榆树点形成，并包括内部到中斜坡的沉积物以及离岸的潮滩岛。平台内部组合（岩相D，H，I，O）和平台坡度组合（岩相D，F，G，H，I，M，N，O）组成上温尼伯河段，并包括开放至稍受限制泻湖的沉积物和下到上斜率设置。孤立的珊瑚礁协会（岩相I，J，K，L，M，N，O）发生在上温尼伯西斯上段孤立的珊瑚礁沉积物中，包括原礁，泻湖，前礁，礁顶和礁滩沉积。盆地盐沼协会（岩相D，E）包括拉特纳组。沥青层状岩（岩相D）出现在斜坡到平台和斜坡到盆地的过渡，平台内部和平台斜坡演替以及盆地演替中。在使用白色和紫外线入射光显微镜检查这些沥青层状岩的代表性样品的基础上，根据存在的黄体组合解释了指示正常或升高的浮游植物生产力（水华）的有机相。研究区的沥青层状岩沉积主要是由于浮游植物生产力提高所致。确定了三个花序相：BL1，蓝藻花序； BL2，蓝藻和藻类花开。和BL3，产生大水珠的浮游植物开花。它们最好在与沉积状态变化相关的地层间隔中发育，包括在温尼伯病发生时从斜坡到平台/盆地以及从开放盆地到受限盆地的过渡。还进行了有机地球化学分析，以评估干酪根的类型，热成熟程度和沥青薄片的石油生成潜力。

著录项

  • 作者

    McDonald, David.;

  • 作者单位

    University of Manitoba (Canada).;

  • 授予单位 University of Manitoba (Canada).;
  • 学科 Geology.; Geochemistry.
  • 学位 M.Sc.
  • 年度 2008
  • 页码 467 p.
  • 总页数 467
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 地质学;地质学;
  • 关键词

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