气候变化领域集成服务门户(CCPortal): A review of feldspar alteration and its geological significance in sedimentary basins: From shallow aquifers to deep hydrocarbon reservoirs

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DOI	10.1016/j.earscirev.2019.02.004
	A review of feldspar alteration and its geological significance in sedimentary basins: From shallow aquifers to deep hydrocarbon reservoirs
	Yuan G.; Cao Y.; Schulz H.-M.; Hao F.; Gluyas J.; Liu K.; Yang T.; Wang Y.; Xi K.; Li F.
发表日期	2019
ISSN	0012-9022
起始页码	114
结束页码	140
卷号	191
英文摘要	The feldspar group is one of the most common types of minerals in the earth's crust. Feldspar alteration (including the whole processes of feldspar dissolution, transfer of released solutes, and secondary mineral precipitation) is ubiquitous and important in fields including resources and environmental sciences. This paper provides a critical review of feldspar alteration and its geological significance in shallow aquifers to deep hydrocarbon reservoirs, as assessed from peer-reviewed paper in the literature. A variety of mechanisms such as the surface reaction-controlled dissolution mechanism, the preferential leaching-diffusion controlled mechanism, the diffusion-precipitation controlled dissolution mechanism and the interfacial dissolution-reprecipitation mechanism have been proposed to be responsible for the dissolution of feldspars. Feldspar dissolution rates can be affected by the crystal structure, Al/Si ordering, temperature, pH, surface area, organic acids, chemical affinity, and precipitation of secondary minerals. Five main dissolution rate laws have been used to describe feldspar dissolution rates, including the linear transition state theory (L-TST) rate law, non-linear TST rate law, parallel rate law, stepwave model rate law, and partial equilibrium law. The rate inconsistency between laboratory experiments and field observations is interpreted with hypotheses that include the armoring effects of the coating secondary minerals on feldspar surfaces, the possible effects of leached layers, the approach to saturation with respect to feldspars, the inhibition by absorbed Al 3+ on the feldspar surface, and the inhibition by simultaneous slow clay precipitation rates. The inorganic-original (meteoric water and deep hot water) and organic-original (kerogen and hydrocarbon degradation) hydrogen ion (H + ) in a fluid can probably act as a significant catalyzer of fast dissolution of feldspars in shallow aquifers and deep hydrocarbon reservoirs. Various mineral assemblages including extensively leached feldspars with a wide range of associated amounts of clay minerals and quartz cements can be identified in subsurface reservoirs under different geological conditions. Feldspar dissolution can generate enhanced secondary porosities and rock permeability in open geochemical systems at shallow depth or at a moderate-deep depth where faults develop widely. While in closed geochemical systems at moderate-deep depth, feldspar dissolution is likely to generate redistributional secondary porosities and to decrease rock permeability. Authigenic clay minerals formed following feldspar dissolution alter rock wettability and affect the charging and entrapment of hydrocarbons in reservoir. Feldspar alteration may promote hydrocarbon degradation by promoting bioactivity or by consuming low molecular weight organic acids and CO 2 produced via oil degradation. Further work should be conducted to study hydrocarbon-water-feldspar interactions in deeply buried hydrocarbon reservoirs. Feldspar alteration may promote CO 2 sequestration by consumption of H + , generation of HCO 3 − , and pH buffering of formation water. K-feldspar alteration may also promote illitization in interbedded mudstones by supplying K + . © 2019 The Authors
英文关键词	Dissolution mechanisms; Feldspar alteration; Mineral assemblage; Organic-inorganic interaction; Rate law; Shallow-deep reservoirs
语种	英语
scopus关键词	aquifer; chemical alteration; dissolution; feldspar group; hydrocarbon reservoir; secondary mineral; sedimentary basin
来源期刊	EARTH-SCIENCE REVIEWS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/209932
作者单位	Key laboratory of Deep Oil and Gas, School of Geosciences, China University of Petroleum, Qingdao, Shandong 266580, China; Laboratory for Marine Mineral Resources, Qingdao National Laboratory for Marine Science and Technology, Qingdao, Shandong 266071, China; GFZ German Research Centre for Geosciences, Section 4.3, Organic Geochemistry, Telegrafenberg, Potsdam, D-14473, Germany; Department of Earth Sciences, Durham University, Durham, DH1 3LE, United Kingdom
推荐引用方式 GB/T 7714	Yuan G.,Cao Y.,Schulz H.-M.,et al. A review of feldspar alteration and its geological significance in sedimentary basins: From shallow aquifers to deep hydrocarbon reservoirs[J],2019,191.
APA	Yuan G..,Cao Y..,Schulz H.-M..,Hao F..,Gluyas J..,...&Li F..(2019).A review of feldspar alteration and its geological significance in sedimentary basins: From shallow aquifers to deep hydrocarbon reservoirs.EARTH-SCIENCE REVIEWS,191.
MLA	Yuan G.,et al."A review of feldspar alteration and its geological significance in sedimentary basins: From shallow aquifers to deep hydrocarbon reservoirs".EARTH-SCIENCE REVIEWS 191(2019).