气候变化领域集成服务门户(CCPortal): Depositional and postdepositional processes of an oil-shale analog at the microstructure scale: The lower cretaceous agrio formation; neuquén basin; northern patagonia

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DOI	10.1306/04082017419
	Depositional and postdepositional processes of an oil-shale analog at the microstructure scale: The lower cretaceous agrio formation; neuquén basin; northern patagonia
	Comerio M.; Fernández D.E.; Rendtorff N.; Cipollone M.; Zalba P.E.; Pazos P.J.
发表日期	2020
ISSN	0149-1423
起始页码	1679
结束页码	1705
卷号	104 期号:8
英文摘要	The Lower Cretaceous Agrio Formation is a source rock considered to be a possible unconventional reservoir. However, no detailed microstructure characterization of this hydrocarbon play has been performed. An exceptional oil-prone level is determined through outcrop information, petrography, x-ray diffraction, geochemical analysis, and x-ray micro-computed tomography (mCT). Microscopic studies reveal a lenticular fabric and calcareous nannofossils suggesting high carbonate productivity in the water column and algal-derived organic matter. The high organic matter content points to anoxic-euxinic conditions consistent with pyrite framboids, authigenic fluorapatite, and an elevated concentration of redox-sensitive elements. However, burrows reveal the activity of infaunal organisms, thus rejecting the idea of persistent bottom-water anoxia. The bioturbated, calcareous plankton and carbonate-rich mudstone represents accumulation in a distal outer ramp setting with calcareous plankton blooms and the co-occurrence of benthic microbial mats. Bottom currents, probably as a consequence of storm-related processes, were involved in detrital transport and oxygenation pulses. A three-dimensional (3-D)-microstructure reconstruction reveals three main mCT density-dependent phases: (1) a low-density phase composed of organic matter and calcite, (2) an intermediate-density phase dominated by calcite and minor organic matter, and (3) a high-density phase composed of authigenic minerals (pyrite, marcasite, and fluorapatite) and silt-sized detrital quartz and plagioclase. This analysis showed that burial diagenesis did not create enough pore space to be evaluated through mCT and that besides mineralogy, particle-size distribution, particle arrangement (sorting), and the local compaction degree affect the 3-D reconstructed structure. The analyzed sample is located toward the carbonaceous end member of the shale spectrum and exemplifies new approaches for the characterization of carbonate oil shales in the unit and similar deposits. From the perspective of unconventional exploration, the evaluation of depositional and postdepositional controls on the resultant microstructure might contribute to a better understanding of potential target intervals within the Agrio Formation. © 2020. The American Association of Petroleum Geologists. All rights reserved.
语种	英语
scopus关键词	Analytical geochemistry; Biogeochemistry; Calcite; Carbonaceous shale; Carbonation; Computerized tomography; Deposition; Feldspar; Image reconstruction; Microstructure; Oil shale; Organic minerals; Particle size; Petroleum prospecting; Plankton; Pyrites; Screening; Sulfide minerals; Algal-derived organic matter; Calcareous nannofossils; Elevated concentrations; Microstructure characterization; Microstructure reconstruction; Threedimensional (3-d); Unconventional reservoirs; X ray micro-computed tomography; Particle size analysis; compaction; concentration (composition); depositional environment; diagenesis; hydrocarbon reservoir; microstructure; mudstone; nanofossil; oil shale; organic matter; oxygenation; particle size; plagioclase; plankton; pore space; quartz; silt; source rock; algae
来源期刊	AAPG Bulletin
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/143678
作者单位	Centro de Tecnología de Recursos Minerales y Cerámica (CETMIC), Comision de Investigaciones Científicas de Buenos Aires (CIC), Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Centro Científico Tecnólogico (CCT) La Plata, CONICET, Manuel B. Gonnet, Argentina; Departamento de Ciencias Geológicas, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Buenos Aires, Argentina; Instituto de Estudios Andinos Don Pablo Groeber (IDEAN), CONICET, Universidad de Buenos Aires, Buenos Aires, Argentina; CETMIC, CIC-CONICET-CCT La Plata, CONICET, Manuel B. Gonnet, Argentina; Departamento de Química, Facultad de Ciencias Exactas, Universidad Nacional de La Plata, La Plata, Argentina; Química Analítica, YPF-Tecnología SA (Y-TEC), Berisso, Buenos Aires, Argentina; IDEAN, CONICET, Universidad de Buenos Aires, Buenos Aires, Argentina
推荐引用方式 GB/T 7714	Comerio M.,Fernández D.E.,Rendtorff N.,et al. Depositional and postdepositional processes of an oil-shale analog at the microstructure scale: The lower cretaceous agrio formation; neuquén basin; northern patagonia[J],2020,104(8).
APA	Comerio M.,Fernández D.E.,Rendtorff N.,Cipollone M.,Zalba P.E.,&Pazos P.J..(2020).Depositional and postdepositional processes of an oil-shale analog at the microstructure scale: The lower cretaceous agrio formation; neuquén basin; northern patagonia.AAPG Bulletin,104(8).
MLA	Comerio M.,et al."Depositional and postdepositional processes of an oil-shale analog at the microstructure scale: The lower cretaceous agrio formation; neuquén basin; northern patagonia".AAPG Bulletin 104.8(2020).