Chapter 3 Diagenesis of Sandstones and Compaction

Wolf, Karl; Chilingarian, George V.

doi:10.1016/s0070-4571(08)71100-2

Cited by 5 publications

(4 citation statements)

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“…Some post depositional features following with chemical and physical changes occur in shale, effect the resistivity of shale to so much extent. Due to clay minerals digenesis, production of fresh water and also reduction of water salinity level occur [24,27]. This phenomena effect the salinity level and this reduces resistivity [28,29].…”

Section: Discussionmentioning

confidence: 99%

Comparative Study of Resistivity Models and Waxman Smits Model in Cooper Basin South Australia-Murteree Shale: Case Study

Ahmed,

Ahmad

2023

Unconventional Methods for Geoscience, Shale Gas and Petroleum in the 21st Century

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Murteree organic shale are one of most rich unconventional gas reservoirs in Cooper Basin, South Australia. In shale gas reservoirs, estimation of water saturation and porosity are very erroneous when calculated from the well logs. In Roseneath and Murteree shales of Copper Basin in South Australia, we investigated their fluids contents using Archie model, Simandoux, Indonesian and Dual water model. Later, brine estimation from Waxman-Smits was correlated with Archie, Simandox, Indonesian and Dual water model results. Due to presence of high amount of clay minerals, conductivity and clay bound water are very high, the changes in salinity level of the brine due to post depositional features, followed by physical and chemical changes effect the determination of water saturation consequently. High clay volume in shale gas reservoirs cause over estimation of water saturation when determined by Archie and other resistivity models. Waxmans-Smiths equation gives more reliable results because it accounts the cation exchange capacity and conductance of clay minerals present in the formation. Also it is noticed that as the clay mineralogy percentage, clay bound water also increases with same pattern respectively. In this paper, description of Waxmans-smith equation in determination of water saturation has been presented and also relation between clay minerals and clay bound water has been discussed. Form our analysis, it has been estimated that, Waxmans-Smit conductivity model gives estimation of water more reliable as compare to resistivity models like Archie, Simandoux and Indonesian in unconventional shale gas reservoir. Hydrocarbon potential are present with respect to water saturation and resistivity logs.

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Section: Discussionmentioning

confidence: 99%

Comparative Study of Resistivity Models and Waxman Smits Model in Cooper Basin South Australia-Murteree Shale: Case Study

Ahmed,

Ahmad

2023

Unconventional Methods for Geoscience, Shale Gas and Petroleum in the 21st Century

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“…Such phenomena do not occur in the lower Nuttall Sandstone, as there is no banding and goethite is more than just a stain. Iron oxide can be diagenetic and form in the basin of deposition as detrital and authigenic iron bearing clay minerals break down (Greensmith 1989, Wolf & Chilingarian 1994, Pettijohn et al 1987. Clays readily absorb iron, and chlorite and smectite can contain iron in their lattices (Greensmith 1989, Pettijohn et al 1987.…”

Section: Analysis Of Primary and Secondary Cement In Lower Nuttall Samentioning

confidence: 99%

“…Arsenopyrite and pyrite in black shales above and below the lower Nuttall Sandstone or in lithic fragments of the sandstone itself may be the source of goethite, although XRD results indicate the surrounding shales are devoid of pyrite and arsenopyrite. If the goethite is locally sourced, a possible method for its precipitation is mentioned by Wolf & Chilingarian (1994) and Pettijohn et al (1987) and is outlined by Greensmith (1989): in a humid climate, iron may be released by hydrolysis into capillary pore water in rock exposed to the atmosphere. When such a situation occurs in the presence of a positive eH, iron is progressively oxidized and precipitated into pore space as goethite or hematite when it dewaters, which may lead to iron oxide concentrations of 1 to 5% in the host rock (Greensmith 1989).…”

Section: Analysis Of Primary and Secondary Cement In Lower Nuttall Samentioning

confidence: 99%

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What makes good climbing rock? A petrographic, structural, and mechanical investigation of the lower Nuttall Sandstone in the New River Gorge, West Virginia

Olcott¹

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Prediction of carbonate diagenesis from well logs using artificial neural network: An innovative technique to understand complex carbonate systems

Abdulaziz

Hawary²

2020

Ain Shams Engineering Journal

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Chapter 3 Diagenesis of Sandstones and Compaction

Cited by 5 publications

References 308 publications

Comparative Study of Resistivity Models and Waxman Smits Model in Cooper Basin South Australia-Murteree Shale: Case Study

Comparative Study of Resistivity Models and Waxman Smits Model in Cooper Basin South Australia-Murteree Shale: Case Study

What makes good climbing rock? A petrographic, structural, and mechanical investigation of the lower Nuttall Sandstone in the New River Gorge, West Virginia

Prediction of carbonate diagenesis from well logs using artificial neural network: An innovative technique to understand complex carbonate systems

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