DOI: 10.1016/j.earscirev.2020.103105
论文题名: Chlorite in sandstones
作者: Worden R.H. ; Griffiths J. ; Wooldridge L.J. ; Utley J.E.P. ; Lawan A.Y. ; Muhammed D.D. ; Simon N. ; Armitage P.J.
刊名: Earth Science Reviews
ISSN: 00128252
出版年: 2020
卷: 204 语种: 英语
中文关键词: Burial diagenesis
; Cement
; Chlorite
; Delta
; Eodiagenesis
; Estuary
; Grain-coating
; Mesodiagenesis
; Pore-filling
; Pyrite
; Quartz-inhibition
; Reservoir quality
; Sandstone
; Sedimentary environment, petrophysics
; Siderite
; Wireline log
英文关键词: aluminosilicate
; authigenic mineral
; cementation
; chlorite
; clay mineral
; detrital deposit
; diagenesis
; iron
; magnesium
; marine sediment
; sandstone
英文摘要: Chlorite, an Fe- and Mg-rich aluminosilicate clay, may be either detrital or authigenic in sandstones. Detrital chlorite includes mineral grains, components of lithic grain, matrix and detrital grain coats. Authigenic chlorite may be grain-coating, pore-filling or grain-replacing. Chlorite can be observed and quantified by a range of laboratory techniques including light optical and scanning electron microscopy and X-ray diffraction; the presence of chlorite in sandstone can be identified by the careful integration of signals from downhole logs. Grain-coating chlorite is the only type of chlorite that can help sandstone reservoir quality since it inhibits quartz cementation in deeply buried sandstones. Grain coats are up to about 10 μm thick and typically isopachous on all grain surfaces; they result from rapid indiscriminate nucleation at high levels of chlorite supersaturation in the pore waters and then growth of appropriately oriented nuclei as ultra-thin, roughly equant crystals. Chlorite can have many possible origins, but it is likely that grain-coating chlorite results from closed system diagenesis at the bed scale. Chlorite sources include transformation of detrital Fe-rich berthierine, transformation of Mg-rich smectite, reaction of kaolinite with sources of Fe and breakdown of volcanic grains. The specific origin of chlorite controls its composition, with chlorite in marine sandstones having a berthierine source and chlorite in continental sandstones having a smectite source. Incorporation of precursor clays required for chlorite growth can be achieved by a variety of processes; these most commonly occur in marginal marine environments possibly explaining why Fe-rich chlorite coats are most commonly found in marginal marine sandstones. © 2020 The Authors Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/166301
Appears in Collections: 气候变化与战略
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作者单位: Department of Earth, Ocean and Ecological Sciences, University of Liverpool, Liverpool, L69 3GP, United Kingdom; BP Exploration, Chertsey Road, Sunbury-on-Thames, Middlesex, TW16 7LN, United Kingdom; BP Upstream Technology, Chertsey Road, Sunbury-on-Thames, Middlesex, TW16 7LN, United Kingdom; Department of Geology, Bayero University, Kano State, Nigeria
Recommended Citation:
Worden R.H.,Griffiths J.,Wooldridge L.J.,et al. Chlorite in sandstones[J]. Earth Science Reviews,2020-01-01,204