气候变化领域集成服务门户(CCPortal): Carbonate cementation patterns, potential mass transfer, and implications for reservoir heterogeneity in Eocene tight-oil sandstones, Dongying depression, Bohai Bay Basin, China: Evidence from petrology, geochemistry, and numerical modeling

CCPortal

DOI	10.1306/04101917330
	Carbonate cementation patterns, potential mass transfer, and implications for reservoir heterogeneity in Eocene tight-oil sandstones, Dongying depression, Bohai Bay Basin, China: Evidence from petrology, geochemistry, and numerical modeling
	Ma B.; Cao Y.; Eriksson K.A.; Wang Y.
发表日期	2019
ISSN	0149-1423
起始页码	3035
结束页码	3067
卷号	103 期号:12
英文摘要	This paper investigates transport mechanisms involving carbonate cementation in Eocene, tight-oil sandstones in Bohai Bay Basin, China, to determine potential mass transfer between adjacent mudstones and sandstones. Evidence from petrology, geochemistry, and numerical modeling suggests two generations of carbonate cementation: (1) early nonferroan calcite (formed at 28°C-41°C) and dolomite (formed at 45°C-63°C); and (2) later ferroan calcite (formed at 105°C-124°C) and ankerite (formed at 101°C-137°C). Based on a one-dimensional model for a coupled sandstone-mudstone system under low and high temperatures, different distribution patterns of carbonate cements reflect episodic concentration gradients that led to diffusive transport of bicarbonate species during progressive burial. Firstly, extensive precipitation of early nonferroan calcite followed by dolomite at or near mudstone-sandstone contacts resulted from initial concentration gradients related to different compositions in primary mineral assemblages. Secondly, introduction of aqueous CO2 from adjacent mudstones into sandstones resulted in dissolution of early nonferroan carbonates and led to diffusive transport of bicarbonate species. These bicarbonate species were incorporated with Fe2+ and subsequently reprecipitated as ferroan carbonate minerals at distances greater than 2 m (>6.6 ft) from sandstone-mudstone contacts. Therefore, short-distance diffusive transport is inferred to have been the predominant transport mechanism associated with carbonate cementation. Large-scale mass transfer between sandstones and adjacent mudstones occurred in a relatively open geochemical system on a very local scale. Numerical model results show that low porosity zones (2.6%-5.1%) exhibit coherence with high abundances of carbonate cements (13.9%-21.2%). Tightly cemented intervals were created by different generations of carbonate cementation and resulted in destruction of sandstone reservoir porosity. © 2019 The American Association of Petroleum Geologists. All rights reserved.
关键词	Calcite Carbonation Cementing (shafts)Cements Gasoline Geochemistry High temperature operations Mass transfer Petroleum transportation Petrology Porosity Sandstone Carbonate cementation Concentration gradients Different distributions Dongying depression Initial concentration One-dimensional model Reservoir heterogeneity Sandstone reservoirs Numerical models calcite carbonate cementation concentration (composition)diffusion dolomite geochemistry heterogeneity hydrocarbon migration hydrocarbon reservoir mass transfer numerical model petrology precipitation (chemistry)sandstone Bohai Sea Bohaiwan Basin China Dongying Depression Shandong
语种	英语
来源机构	AAPG Bulletin
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/131695
推荐引用方式 GB/T 7714	Ma B.,Cao Y.,Eriksson K.A.,et al. Carbonate cementation patterns, potential mass transfer, and implications for reservoir heterogeneity in Eocene tight-oil sandstones, Dongying depression, Bohai Bay Basin, China: Evidence from petrology, geochemistry, and numerical modeling[J]. AAPG Bulletin,2019,103(12).
APA	Ma B.,Cao Y.,Eriksson K.A.,&Wang Y..(2019).Carbonate cementation patterns, potential mass transfer, and implications for reservoir heterogeneity in Eocene tight-oil sandstones, Dongying depression, Bohai Bay Basin, China: Evidence from petrology, geochemistry, and numerical modeling.,103(12).
MLA	Ma B.,et al."Carbonate cementation patterns, potential mass transfer, and implications for reservoir heterogeneity in Eocene tight-oil sandstones, Dongying depression, Bohai Bay Basin, China: Evidence from petrology, geochemistry, and numerical modeling".103.12(2019).