Feldspar dissolution, authigenic clays and quartz cements in open or closed sandstone geochemical systems Guanghui Yuan 1, Yingchang Cao 1 Yanzhong Wang.

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Presentation transcript:

Feldspar dissolution, authigenic clays and quartz cements in open or closed sandstone geochemical systems Guanghui Yuan 1, Yingchang Cao 1 Yanzhong Wang 1, China University of Petroleum (East China), Florida, June 23rd 2015

Questions Buried sandstones Mineral assemblage A ： Feldspar pores + Authigenic clays + quartz cements ? Mineral assemblage B ： Feldspar pores ?

Dongying Sag Limited faults —strong fluid overpressure — high water salinity

Nanpu Sag Developed faults — normal fluid pressure — low water salinity

Medium- to coarse-grained sandstones Lithofacies

Dongying Sag Nanpu Sag lithic arkoses & feldspathic litharenites Detrital compositions

Tuo720, m （ + ） Tuo717, m （ - ） Tuo720, m ， Yong92, m （ + ） Diagenesis: Quartz cements Dongying Sag Quartz overgrowths + quartz crystals

Diagenesis: Authigenic clays >125 ℃ Tuo123 ， m ， SEM Yong924 ， m, (-) Yan2 ， m, （ + ） Tuo720 ， m, (-) Dongying Sag m( ℃ ): Quartz + kaolinite m( ℃ ): Quartz + illite

Gao23 ， m Liu13x2 ， m Liu68x1 ， m ， Diagenesis: Quartz cements Liu24 ， m Nanpu Sag Quartz overgrowths + quartz crystals

Gao8x1 井， m Gao13 ， m Liu1-3 ， m >125 ℃ Diagenesis: Authigenic clays Nanpu Sag m( ℃ ): Quartz + kaolinite

Fluid inclusions & δ 18 O Th: 105 ～ 125 ℃ δ 18 O -cement: 20 ～ 25‰ δ 18 O -water : +1 ～ +4‰ Dongying Sag

Fluid inclusions & δ 18 O Th: 105 ～ 120 ℃ δ 18 O -cement: 17 ～ 20‰ δ 18 O -water : -5 ～ -2‰ Nanpu Sag Homogenization temperature ( ℃ ) Frequency

Pore water chemistry Dongying Sag: high salinity + high salinity gradient Nanpu Sag: low salinity + low salinity gradient

Pore water chemistry Nanpu Sag Negative δD (1)little difference to shallow water or river water (2)great difference to formation water without meteoric water flux

Mass transfer Dongying Sag System on scale of grains: open to Al 3+ and SiO 2 (aq) System on scale of thin section: closed to Al 3+ and SiO 2 (aq)

Mass transfer 柳 60x1, m （ - ） Nanpu Sag System on scale of thin section – sandstone beds : open to Al 3+ and SiO 2 (aq)

Dissolution’s impact on porosity Closed system: little impact on porosity Open system: enhance significant porosity

Dissolution’s impact on permeability Closed system: degrade permeability Open system: enhance permeability

Redistribution models of byproducts Closed system: feldspar dissolution → secondary pores + in situ quarz +clays Open system: feldspar dissolution → secondary pores

Conclusions 1.Feldspar dissolution in Dongying Sag occurred in closed geochemical system with limited fractures, little meteoric water flux and high water salinity. 2.Feldspar dissolution in Nanpu sag occurred in open geochemical system with developed fractures, massive meteoric water flux and high water salinity. 3.Feldspar dissolution in closed geochemical system led to extensive in situ precipitation of authigenic quartz and clays, enhanced little porosity and degraded permeability; 4.feldspar dissolution in open geochemical system led to weak in situ precipitation of authigenic quartz and clays, enhanced much porosity and permeability.

Thanks a lot!