Kaolinite-to-dickite reaction in sandstone reservoirs

被引:70
作者
Beaufort, D
Cassagnabere, A
Petit, S
Lanson, B
Berger, G
Lacharpagne, JC
Johansen, H
机构
[1] Univ Poitiers, CNRS, UMR 6532, F-86022 Poitiers, France
[2] Univ Grenoble 1, LGIT IRIGM, F-38041 Grenoble 9, France
[3] Univ Toulouse 3, CNRS, UMR 5563, Lab Geochim, F-31054 Toulouse, France
[4] ELF Aquitaine Prod, DTIS, SED, F-64018 Pau, France
[5] Inst Energiteknikk, N-2007 Kjeller, Norway
关键词
D O I
10.1180/000985598545499
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The SEM, XRD, FTIR and DTA analyses of different size-fractions of clay material from sandstone reservoirs which have experienced a large range of burial conditions have been used to examine the different steps of the depth-related kaolinite-dickite reaction. Dickite progressively replaced kaolinite within a range of burial depths estimated between about 2500 m and 5000 m. The kaolinite-to-dickite reaction proceeds by gradual structural changes concomitant to crystal coarsening and change from booklet to blocky morphology. The crystallization of dickite proceeds by two distinct paths: (1) Accretion of new material from either dissolution of smaller unstable kaolinite crystals and/or detrital minerals (chiefly feldspars), on early-formed coarser metastable kaolinite crystals which exert extended morphological control on the growing crystals. (2) Neoformation of ordered dickite which will continue to grow by a dissolution-crystallization process. The kaolinite-to-dickite reaction is kinetically controlled and anomalies in the kaolinite/dickite ratio observed in certain sandstone reservoirs may be used to assess the timing of invasion by hydrocarbons.
引用
收藏
页码:297 / 316
页数:20
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