The magnesium isotope (δ26Mg) signature of dolomites

Geske, Anna; Goldstein, Robert H.; Mavromatis, Vasileios; Richter, Detlev K.; Buhl, Dieter; Kluge, Tobias; John, Cédric M.; Immenhauser, Adrian

doi:10.1016/j.gca.2014.11.003

Cited by 126 publications

(87 citation statements)

References 121 publications

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“…Similar effects have been suggested for high Mg/Ca ratios, alkaline pH, high CO 3 2− ion activity, moderate to high Fe 2+ and dissolved sulfide concentrations, low sulfate concentrations, elevated temperature and presence of seeds (e.g., Lippmann, 1973;Land, 1980;Baker & Kastner, 1981;McKenzie, 1981;Lumsden et al, 1995;Vasconcelos et al, 1995;Arvidson & MacKenzie, 1999;Warren, 2000;Zhang et al, 2012;Geske et al, 2015). Since the development of the microbial model (Vasconcelos & McKenzie, 1997), the links between microbial activity, pore fluid geochemistry and the preferential precipitation of dolomite in micro-environments developing around the cells have been widely decoded (e.g., Warthmann et al, 2005;Bontognali et al, 2010).…”

Section: Introductionsupporting

confidence: 70%

The role of bacterial sulfate reduction during dolomite precipitation: Implications from Upper Jurassic platform carbonates

et al. 2015

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Section: Introductionsupporting

confidence: 70%

The role of bacterial sulfate reduction during dolomite precipitation: Implications from Upper Jurassic platform carbonates

et al. 2015

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“…The analysis of less conventional stable isotopes (Mg, Fe, etc. ;Geske et al 2015) is now possible although the science of metal isotopes is in its relative infancy and has not yet found routine application for reservoir quality analysis.…”

Section: Analytical Techniquesmentioning

confidence: 99%

Petroleum reservoir quality prediction: overview and contrasting approaches from sandstone and carbonate communities

Worden

Armitage

Butcher

et al. 2018

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Abstract:The porosity and permeability of sandstone and carbonate reservoirs (known as reservoir quality) are essential inputs for successful oil and gas resource exploration and exploitation. This chapter introduces basic concepts, analytical and modelling techniques and some of the key controversies to be discussed in 20 research papers that were initially presented at a Geological Society conference in 2014 titled 'Reservoir Quality of Clastic and Carbonate Rocks: Analysis, Modelling and Prediction'. Reservoir quality in both sandstones and carbonates is studied using a wide range of techniques: log analysis and petrophysical core analysis, core description, routine petrographic tools and, ideally, less routine techniques such as stable isotope analysis, fluid inclusion analysis and other geochemical approaches. Sandstone and carbonate reservoirs both benefit from the study of modern analogues to constrain the primary character of sediment before they become a hydrocarbon reservoir. Prediction of sandstone and carbonate reservoir properties also benefits from running constrained experiments to simulate diagenetic processes during burial, compaction and heating. There are many common controls on sandstone and carbonate reservoir quality, including environment of deposition, rate of deposition and rate and magnitude of sea-level change, and many eogenetic processes. Compactional and mesogenetic processes tend to affect sandstone and carbonate somewhat differently but are both influenced by rate of burial, and the thermal and pressure history of a basin. Key differences in sandstone and carbonate reservoir quality include the specific influence of stratigraphic age on seawater composition (calcite v. aragonite oceans), the greater role of compaction in sandstones and the greater reactivity and geochemical openness of carbonate systems. Some of the key controversies in sandstone and carbonate reservoir quality focus on the role of petroleum emplacement on diagenesis and porosity loss, the role of effective stress in chemical compaction (pressure solution) and the degree of geochemical openness of reservoirs during diagenesis and cementation. This collection of papers contains case study-based examples of sandstone and carbonate reservoir quality prediction as well as modern analogue, outcrop analogue, modelling and advanced analytical approaches.Gold Open Access: This article is published under the terms of the CC-BY 3.0 license.Porosity and permeability (reservoir quality) exert fundamental controls on the economic viability of a petroleum accumulation (Blackbourn 2012).They need to be quantified from basin access and exploration, via appraisal and field development through secondary and tertiary recovery in order to

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“…Geske et al (2015) reported Mg isotope compositions of dolomite from various environments having a total range from −2.49 to −0.45 ‰ and argued that Mg isotope ratios are affected by a variety of factors, making the application of Mg isotopes as a proxy for their depositional and diagenetic environment problematic. On the hand, as observed by Azmy et al (2013), early diagenetic dolomite inherits its isotope signature from precursor carbonates and diagenetic fluids.…”

Section: Carbonatesmentioning

confidence: 99%

Isotope Fractionation Processes of Selected Elements

Hoefs

2015

Stable Isotope Geochemistry

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The magnesium isotope (δ26Mg) signature of dolomites

Cited by 126 publications

References 121 publications

The role of bacterial sulfate reduction during dolomite precipitation: Implications from Upper Jurassic platform carbonates

The role of bacterial sulfate reduction during dolomite precipitation: Implications from Upper Jurassic platform carbonates

Petroleum reservoir quality prediction: overview and contrasting approaches from sandstone and carbonate communities

Isotope Fractionation Processes of Selected Elements

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