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首页> 外文学位 >The late cretaceous Belle Fourche and Second White Specks formations in west-central Alberta, Canada, as an emerging hybrid source rock/reservoir shale play.
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The late cretaceous Belle Fourche and Second White Specks formations in west-central Alberta, Canada, as an emerging hybrid source rock/reservoir shale play.

机译：在加拿大艾伯塔中西部的晚白垩世百丽-富奇和第二白斑组，是一种新兴的混合烃源岩/储集页岩。

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摘要

Organic-rich mudstones with up to 10 wt. % total organic carbon (TOC) from seven sediment cores in west-central Alberta encompassing the upper Belle Fourche and lower Second White Specks Formations in the Western Canada Sedimentary Basin are being evaluated as a hybrid source rock/reservoir shale play. Geochemistry and organic petrography indicate a normal marine paleoenvironment with deposition of kerogen Type II based on the predominance of marine alginite and amorphous organic matter, limited amounts of terrigenous vitrinite and inertinite macerals, and the presence of marine fossils. The prevalence of short-chain n-alkanes (n-C13 to n-C19), a general predominance of C28 -alphabetabeta(H)-20S steranes, and small concentrations of oleanane confirm the dominantly algal and planktonic origin of organic matter. The thermal maturity increases westward across Alberta with two thermally immature cores (∼0.43% Ro vitrinite reflectance), one early mature core (∼0.65% Ro), and four cores representing mid-mature stages (∼0.78 to 0.90% Ro). A combination of helium porosimetry with low-pressure CO2 and N2 adsorption techniques was used to quantify porosity. The total porosity decreased from ∼10 vol. % to ∼1.0 vol. % (from ∼0.05 cm3/g to ∼0.005 cm3/g) along the maturation sequence. In general, organic matter is the strongest contributor to microporosity (with <2nm pore diameter). Overall, inter- and intraparticle pores in quartz contribute to greater abundance of micro-, meso- (2-50 nm O diameter), and macropores (>50 nm O), while the increasing content of clay minerals (illite, kaolinite, and chlorite) enhances both micro- and mesopore volumes. In contrast, carbonates (calcite and dolomite) seem to have a negative effect on porosity volumes in the measured shales. All thermally mature cores show good remaining hydrocarbon potential (2-48 mg hydrocarbon/g rock) and are dominantly oil prone as suggested by maceral compositions. Therefore, the Belle Fourche and Second White Specks Formations represent potential targets for unconventional light shale oil production.
机译：富含有机物的泥岩，最高可达10 wt。来自加拿大艾伯塔省中西部的七个沉积物岩心的总有机碳百分比（TOC），包括加拿大西部沉积盆地中的上层Belle Fourche组和下层第二个白色斑点组，正在作为混合源岩/储层页岩层进行评估。地球化学和有机岩相学表明，正常的海洋古环境具有II型干酪根的沉积，这是基于海洋藻酸盐和无定形有机物的优势，少量的陆源性镜质体和惰质软化岩以及海洋化石的存在引起的。短链正构烷烃（n-C13到n-C19）的普遍存在，C28 -alphabetabeta（H）-20S甾烷的普遍盛行以及少量的齐墩果烷证实了有机物的主要藻类和浮游生物起源。热成熟度在艾伯塔省向西增加，有两个热不成熟的岩心（镜质体反射率约为0.43％Ro），一个早熟岩心（约0.65％Ro）和四个代表中熟阶段的岩心（约0.78至0.90％Ro）。氦气孔隙率法与低压CO2和N2吸附技术的结合用于量化孔隙率。总孔隙率从〜10 vol。降低。 ％至约1.0体积％（从〜0.05 cm3 / g到〜0.005 cm3 / g）。通常，有机物是造成微孔性最强的因素（孔径<2nm）。总体而言，石英中的颗粒间和颗粒内孔隙会导致更大的微观，中观（直径2-50 nm O）和大孔（> 50 nm O）丰度，而粘土矿物（伊利石，高岭石和亚氯酸盐）会同时增加微孔和中孔的体积。相反，碳酸盐（方解石和白云石）似乎对测得的页岩中的孔隙度有负面影响。所有热成熟的岩心均显示出良好的剩余烃潜力（2-48 mg烃/ g岩石），并且如黄石组合物所建议的那样，主要易发油。因此，Belle Fourche和Second White Specks地层代表了非常规轻页岩油生产的潜在目标。

著录项

  • 作者

    Furmann, Agnieszka.;

  • 作者单位

    Indiana University.;

  • 授予单位 Indiana University.;
  • 学科 Geology.;Marine geology.;Petroleum geology.
  • 学位 Ph.D.
  • 年度 2015
  • 页码 256 p.
  • 总页数 256
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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