Berthierine formation in reservoir rocks from the Siri oilfield (Danish North Sea) as result of fluid–rock interactions: Part II. Deciphering organic–inorganic processes by hydrogeochemical modeling

Fu, Yunjiao; Berk, Wolfgang van; Schulz, Hans-Martin; Mu, Nana

doi:10.1016/j.marpetgeo.2015.01.007

Cited by 9 publications

(12 citation statements)

References 33 publications

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“…The exclusion or neglect of potential berthierine formation in glauconitic sandstones could lead to a strong overestimation of the calculated CO 2 -sequestering capacity. Although siderite formation was proven in the glauconitic reservoir rocks of the Siri field, it is not a product of glauconite alteration (Fu et al, 2015). In contrast, the calculated results of several modeling approaches stated that siderite newly forms in glauconitic sandstones due to CO 2 injection (e.g., Gunter et al, 2000;Xu et al, 2004).…”

Section: Introductionmentioning

confidence: 94%

“…A 1.5 molal NaCl solution is used as the pore water of the reactor and is exposed to temperature-pressure conditions of 78 C and 230 atm which also prevail in the Siri field. This aims to compare the calculated results of this presented study with the observed and the calculated results of the diagenetic features in the glauconitic sandstones of the Siri field (Fu et al, 2015). A series of modeling scenarios were calculated to investigate the pH-E H conditions of glauconite dissolution, as well as of berthierine formation and dissolution (Table 1).…”

Section: Hydrogeochemical Modeling Conceptmentioning

confidence: 99%

“…These scenarios cover a broad range of pH-E H conditions that were conceptually designed by stepwise addition of different reactants (CO 2 , CH 4 , or O 2 ) triggering proton-and electron transfer reactions (Table 1), until a gas phase begins to form or until the primary mineral completely dissolves. Dissolution of glauconite or berthierine (composition from Fu et al, 2015) releases different species into the pore water, such as Fe 3þ (aq) , Fe 2þ (aq) , Mg 2þ (aq) , and H 4 SiO 4(aq) (Eqs. (1) and (2)).…”

Section: Hydrogeochemical Modeling Conceptmentioning

confidence: 99%

“…Several of them considered selected and isolated hydrogeochemical reactions, and excluded the potential formation of any secondary Fe-und Mgbearing silicate mineral, for instance, berthierine ((Fe 2þ ,Mg,Al) 2-3 (Si,Al) 2 O 5 (OH) 4 ). A combination of analytical investigations and hydrogeochemical modeling highlights that berthierine formation acts as one of the most important diagenetic processes of glauconite alteration in the reservoir rocks of the Siri oilfield (Danish North Sea; Fu et al, 2015). In addition, berthierine co-exists with altered glauconite in the Nullawarre Greensand containing organic lamellae and bone fragments (in southeastern Australia; Boyd et al, 2004).…”

Section: Introductionmentioning

confidence: 99%

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Berthierine formation in reservoir rocks from the Siri oilfield (Danish North Sea) as result of fluid–rock interactions: Part III. Determining mineral stability and CO2-sequestering capacity of glauconitic sandstones

Berk

Schulz

et al. 2015

Marine and Petroleum Geology

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a b s t r a c tBerthierine was proven as one of the most important products of glauconite alteration in the Siri oilfield (Danish North Sea). However, there is an ongoing debate regarding the main product of glauconite dissolution: siderite, berthierine, or berthierine as a precursor of siderite and/or magnesium-bearing carbonate. In order to investigate the consequences of glauconite dissolution in view of thermodynamic admissibility and the resulting CO 2 -sequestering capacity, a hydrogeochemical model, which is based on thermodynamics of chemical equilibrium, was developed. Calculating various modeling scenarios helps to conclude on the pH-E H conditions of glauconite dissolution as well as of berthierine formation and dissolution in generic, aqueous systems under elevated temperature-pressure conditions.Our modeling results highlight that carbonate formation cannot be triggered exclusively by CO 2 addition into glauconitic sandstones. The injection of pure CO 2 into glauconitic sandstones leads to acidic and anoxic oxidizing conditions under which glauconite remains stable. To intensify glauconite alteration by CO 2 injection, glauconitic sandstones have to be in contact with degradable organic matter, or, alternatively, reducing agents have to be co-injected with CO 2 . Sufficient electron transfer to ferric iron bound in glauconite is the ultimate control for intense glauconite alteration and for subsequent berthierine precipitation.Once formed, berthierine remains stable over a broad pH range and is not transformed to any carbonate under reducing conditions. Thus, CO 2 injection into glauconitic sandstones under reducing conditions mainly leads to formation of berthierine instead of iron-and magnesium-carbonates. However, hydrogeochemical conditions in the subsurface can affect CO 2 sequestration via glauconite dissolution and the resulting carbonate formation, including the pH-E H conditions, the chemical composition of glauconite, and the overall mineralogical composition of glauconitic sandstones.

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Section: Introductionmentioning

confidence: 94%

Section: Hydrogeochemical Modeling Conceptmentioning

confidence: 99%

Section: Hydrogeochemical Modeling Conceptmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Berthierine formation in reservoir rocks from the Siri oilfield (Danish North Sea) as result of fluid–rock interactions: Part III. Determining mineral stability and CO2-sequestering capacity of glauconitic sandstones

Berk

Schulz

et al. 2015

Marine and Petroleum Geology

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“…Some glauconite pellets altered within hydrocarbon-bearing sandstones at the shallowmarine Ampfing Formation. Fu et al (2015) related glauconite alteration in reservoir rocks to oil biodegradation. However, oil within the Eocene reservoir shows no sign of biodegradation (Gratzer et al, 2011).…”

mentioning

confidence: 99%

Carbonate cementation in Upper Eocene clastic reservoir rocks from the North Alpine Foreland Basin (Austria)

Grundtner¹,

Groß²,

Gratzer³

et al. 2017

AJES

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A strong relationship between carbonate precipitation and microbial gas generation is evident for the Upper Eocene reservoir rocks of the North Alpine Foreland Basin. To achieve a better understanding of this relationship, 40 samples of limnic to shallow marine, gas-, oil-and water-bearing sandstones were studied to determine mineralogy and diagenetic history. The specific mineral parageneses were used to reconstruct changes in the hydrogeochemical conditions over time. Thus, authigenic mineral phases within reservoir rocks are an important archive for the reconstruction of pore fluid composition changes.The eogenetic pore space evolution of investigated Eocene sandstones is influenced by their primary mineralogy, which is strongly controlled by (i) depositional environment, (ii) detrital input and (iii) transport distances. Thus, a low compositional maturity is associated with high feldspar and high clay mineral content. Authigenic clay minerals, formed during several stages of diagenesis, play an important role for reservoir quality, due to pore space reduction.During eogenesis, authigenic micritic and sparitic carbonate phases are precipitated, which decreases the pore space. These eogenetic carbonate cements exhibit isotope values of about δ C: -5.9 to +2.2‰ and O: -8.3 to -4.3‰ [VPDB]. Some of these sam- 18ples indicate a trend towards lighter δ O values (-17.2‰), which is attributed to meteoric flush.Within the Eocene sandstones, two types of strongly cemented zones with low permeabilities can be differentiated: (i) extraordi- 13nary light δ C (-28.4‰) carbonates, which formed due to degradation of organic matter at the stage of advanced sulfate reduc- 13tion and (ii) heavy δ C (δ C: +8.7‰), which precipitated at the fermentation zone. Within the reservoir sandstones telogenesis is characterized by mineral destabilization (e.g. carbonate and feldspar corrosion) and kaolinite precipitation. The formation of authigenic kaolinite booklets resulted into a decrease in porosity.

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Berthierine authigenesis as grain pseudomorph? A new insight from the early Maastrichtian Kallankurichchi Formation, India

Roy Choudhury,

Srimani,

Mondal

et al. 2024

Applied Clay Science

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Berthierine formation in reservoir rocks from the Siri oilfield (Danish North Sea) as result of fluid–rock interactions: Part II. Deciphering organic–inorganic processes by hydrogeochemical modeling

Cited by 9 publications

References 33 publications

Berthierine formation in reservoir rocks from the Siri oilfield (Danish North Sea) as result of fluid–rock interactions: Part III. Determining mineral stability and CO2-sequestering capacity of glauconitic sandstones

Berthierine formation in reservoir rocks from the Siri oilfield (Danish North Sea) as result of fluid–rock interactions: Part III. Determining mineral stability and CO2-sequestering capacity of glauconitic sandstones

Carbonate cementation in Upper Eocene clastic reservoir rocks from the North Alpine Foreland Basin (Austria)

Berthierine authigenesis as grain pseudomorph? A new insight from the early Maastrichtian Kallankurichchi Formation, India

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