Concepts and Models of Dolomitization—an Introduction

Zenger, Donald H.; Dunham, John B.

doi:10.2110/pec.80.28.0001

Cited by 66 publications

(55 citation statements)

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“…Testing and comparing of these properties have been highlighted by several authors, who state that besides many other properties, lamination could strongly affect the physical-mechanical properties of the stone varieties (Tomaši et al, 1990(Tomaši et al, , 1992(Tomaši et al, , 1997 The dolomitization affects the stone porosity and could increase the intergranular porosity in original carbonate rocks (Chilingar et al, 1979;Morse and Mackenzie, 1990;Morse, 2005). The distinction between the earlydiagenetic and late-diagenetic dolomites in the crystal sizes and ordering of the crystal lattices was already reported by Goldsmith and Graff (1958), and general classi cation to early-and late-diagenetic dolomites, together with their counterparts (primary-sinsedimentary and secondary dolomites), is widely used since then (Zenger et al, 1980;Tucker, 1990; Purser et al, 1994; Scholle and Ulmer- Scholle, 2003;Flügel, 2004). Early-diagenetic dolomites mainly have ner crystals and a high-ordered crystal lattice, and late-diagenetic dolomites mainly have large crystals and a low-ordered crystal lattice (Kaczmarek and Sibley, 2011).…”

Section: Introductionmentioning

confidence: 79%

Physical and Mechanical Properties of Dolomites Related to Sedimentary and Diagenetic Features – Case Study of the Upper Triassic Dolomites From Medvednica and Samobor Mts., Nw Croatia

Maričić

Starčević

Barudžija

2018

MGPB

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Sedimentary and diagenetic features of Upper Triassic dolomites are determined and related to technical properties (apparent density, water absorption, open porosity and point load strength tested by Point Load Test, PLT) for possible use as building aggregate. Samples are taken from three quarries in the Medvednica and Samobor Mts., in NW Croatia. Samples from the Ivanec Quarry are determined as the early-diagenetic dolomite (EDD), late-diagenetic dolomite (LDD) and "transitional" dolomite (TD). Samples from the Dolje Quarry are determined as early-diagenetic dolomite (EDD) and late-diagenetic dolomite (LDD). The samples from the Gradna Quarry are determined as late-diagenetic dolomites (LDD). According to the physical and mechanical properties, the best variety to use as a crushed stone or as an aggregate proved to be the late-diagenetic dolomite from the Dolje Quarry. Samples from the Dolje Quarry have the lowest values of open porosity and water absorption and the highest values of apparent density and PLT, due to their sedimentary--diagenetic features.

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Section: Introductionmentioning

confidence: 79%

Physical and Mechanical Properties of Dolomites Related to Sedimentary and Diagenetic Features – Case Study of the Upper Triassic Dolomites From Medvednica and Samobor Mts., Nw Croatia

Maričić

Starčević

Barudžija

2018

MGPB

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“…Dolomitization is a process which is still poorly understood, but it is clear that a variety of mechanisms operate over a wide range of burial depths from the surface to the deep parts of major sedimentary basins (e.g., Friedman and Sanders, 1967;Zenger, Dunham, and Ethington, 1980;Mattes and Mountjoy, 1980;Gregg and Sibley, 1984;Machel and Mountjoy, 1986;Hardie, 1987). Dolomitization of a limestone may reduce or increase porosity, or leave it unchanged.…”

Section: Relationship Of Porosity To Recovery Efficiencymentioning

confidence: 99%

Reservoir characterization, porosity, and recovery efficiency of deeply-buried paleozoic carbonates: Examples from Oklahoma, Texas and New Mexico

Amthor

Kopaska-Merkel

Friedman

1988

Carbonates Evaporites

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Oaplllary-preeeure data from the Early Ordovician Ellenburger Dolomite (west Texas and New Mexico)and the Late Ordovician-Early Devonian Hunton Group carbonates (Oklahoma) are used to calculate or infer petrophysical characteristics, such as median pore-throat size, pore-throat sille distribution, eerective porosity, and recovery efficiency (RE). For both data sets, porosity and RE are inversely related. A positive relationship between RE and poroeity has been reported by other workers, but the relative importance of these opposed trends is unknown.The ability to accurately predict which relationship will hold in a given reservoir unit would be of great value for predicting reservoir performance.RE is also inversely related to median throat size. This is a consequence of two controlling factors: rock characteristics and experimental procedure.Drainage (recovery) from small throats is more eCCicient than from large throats, and hysteresis limits recovery from large throats because throats filled at very low pressures early in the intrusion precess remain filled at comparable pressures upon extrusion.The experimental procedure also suppresses extrusion from large throats because the minimum pressure attained on extrusion is greater than the initial intrusion pressure, due to limitations of the apparatus.Reservoir rocks are classified in terms of their capillary-pressure curve form, because curve form is controlled by a variety of petrophysical factors which can be measured, and because curve form is strongly correlated with recovery efficiency.Steep-convex capillary-pressure curves correspond to samples with high REs, low porosities, small median throats, and high entry preaeures.Steep-concave curves correlate with low REs, high porosities, large median throats, and low entry preseures.Gently-sloping curves correspond to samples with moderate REs, intermediate median throat s_, poorly-defined entry pressures, platykurtic throat-sise distributions, and variable porosities.Polymodal curves result from polymodal throat-sise distributions, and exhibit variable REs and porosities.Steep-concave and steep-convex curves are interpreted in two quite different ways, as follows. Steep-convex curves indicate reservoir rocks with high REs, but low porosities and small throats, so that production is likely to be economical only under high pressures (or thick' oil columns) or from very large hydrocarbon pools.Conversely, steepconcave curves indicate porous reservoir rocks with large throats but probably poor primary recovery efficiency. These raerYoin will be economical even at low preseures and with short oil columns and small total reserves, but will probably need enhanced recovery to produce a significant proportion of reserves.This c1aseification may allow characterisation of an "ideal" capillary-preseure curve, which is characterised by a moderate entry pressure, intermediate median throat sise, good RE, moderate porosity, and leptolturtic throat-sise distribution.Capillary-pre88ure plots showing both cumulative and incremen...

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“…Since 50% of the global carbonates are dolomitic (Zengler et al, 1980), it seems necessary to develop an appropriate fractionation method for those soils. We introduce a stepwise density-fractionation method, which (1) does not rely on destruction of dolomite by acid, (2) minimizes the dissolution of dolomite during the fractionation procedure by applying a fast fractionation scheme, and (3) separates carbonates from OC-rich compounds and minerals associated with SOM such as clay minerals and Fe oxides.…”

Section: Introductionmentioning

confidence: 99%

Density fractionation of organic matter in dolomite‐derived soils

Kreyling

Kölbl

Spielvogel

et al. 2013

Z. Pflanzenernähr. Bodenk.

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Dolomite (CaMg(CO 3 ) 2 ) constitutes half of the global carbonates. Thus, many calcareous soils have been developing rather from dolomitic rocks than from calcite (CaCO 3 )-dominated limestone. We developed a physical fractionation procedure based on three fractionation steps, using sonication with subsequent density fractionation to separate soil organic matter (SOM) from dolomite-derived soil constituents. The method avoids acidic pretreatment for destruction of carbonates but aims at separating out carbonate minerals according to density. The fractionation was tested on three soils developed on dolostone parent material (alluvial gravel and solid rock), differing in organic-C (OC) and inorganic-C (IC) concentrations and degree of carbonate weathering. Soil samples were suspended and centrifuged in Na-polytungstate (SPT) solutions of increasing density, resulting in five different fractions: two light fractions < 1.8 g cm -3 (> 20 lm and < 20 lm), rich in OC and free of carbonate, and two organomineral fractions (1.8-2.4 g cm -3 and 2.4-2.6 g cm -3 ), containing 66-145 mg g -1 and 16-29 mg g -1 OC. The organomineral fractions consist of residual clay from carbonate weathering such as clay minerals and iron oxides associated with SOM. The fifth fraction (> 2.6 g cm -3 ) was dominated by dolomite (85%-95%). The density separation yielded fractions differing in mineral compositions, as well as in SOM, indicated by soil-type-specific OC distributions and decreasing OC : N ratios with increasing density of fractions. The presented method is applicable to a wide range of dolomitic and most likely to all other calcareous soils.

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Concepts and Models of Dolomitization—an Introduction

Cited by 66 publications

References 0 publications

Physical and Mechanical Properties of Dolomites Related to Sedimentary and Diagenetic Features – Case Study of the Upper Triassic Dolomites From Medvednica and Samobor Mts., Nw Croatia

Physical and Mechanical Properties of Dolomites Related to Sedimentary and Diagenetic Features – Case Study of the Upper Triassic Dolomites From Medvednica and Samobor Mts., Nw Croatia

Reservoir characterization, porosity, and recovery efficiency of deeply-buried paleozoic carbonates: Examples from Oklahoma, Texas and New Mexico

Density fractionation of organic matter in dolomite‐derived soils

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