Imperial College London
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Dr Cédric M. John

Faculty of Engineering, Department of Earth Science & Engineering

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cedric.john Website

 
 
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N/ARoyal School of MinesSouth Kensington Campus

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Summary

 

Publications

Publication Type
Year
to

141 results found

Kluge T, John CM, 2015, Effects of brine chemistry and polymorphism on clumped isotopes revealed by laboratory precipitation of mono- and multiphase calcium carbonates, Geochimica et Cosmochimica Acta, Vol: 160, Pages: 155-168, ISSN: 1872-9533

Carbonate clumped isotopes are applied to an increasing number of geological archives to address a wide range of Earth science questions. However, the effect of changes in salinity on the carbonate clumped isotope technique has not been investigated experimentally yet. In particular, evaporated sea water and diagenetic fluids differ substantially from solutions used to calibrate the clumped isotope thermometer as they exhibit high ionic concentrations of e.g., Na+, Ca2+, Mg2+, and Cl−. High ionic concentrations are known to have an impact on δ18O values, and could potentially impact the successful application of clumped isotopes to the reconstruction of diagenetic processes, including precipitation temperatures and the origin of the diagenetic fluid.In order to address the potential influence of salt ions on the clumped isotope Δ47 value we precipitated CaCO3 minerals (calcite, aragonite and vaterite), hydromagnesite and mixtures of these minerals in the laboratory from solutions containing different salt ions (Na+, Ca2+, Mg2+, Cl−) at various concentrations and temperatures. The precipitation of some mineralogies was restricted to solutions with specific ionic concentrations, limiting direct comparability. NaCl-rich solutions mostly led to vaterite formation. In control experiments CaCO3 minerals (calcite and aragonite) were precipitated from a CaCO3 supersaturated solution without addition of any other ions.Our results show that calcium carbonates precipitated from high NaCl concentrations yield Δ47 values identical to our NaCl-free control solution. Although addition of Mg led to the formation of hydromagnesite, it also follows the same Δ47-T calibration as calcite. In contrast, Δ47 values increase together with increased CaCl2 concentrations, and deviate by a few 0.01‰ from expected equilibrium values.Overall, clumped isotope values of CaCO3 minerals precipitated between 23 °C and 91 °C (with and without N

Journal article

Vandeginste V, John CM, Beckert J, 2015, Diagenetic Geobodies: Fracture-Controlled Burial Dolomite in Outcrops From Northern Oman, SPE RESERVOIR EVALUATION & ENGINEERING, Vol: 18, Pages: 84-93, ISSN: 1094-6470

Journal article

Geske A, Goldstein RH, Mavromatis V, Richter DK, Buhl D, Kluge T, John CM, Immenhauser Aet al., 2015, The magnesium isotope (δ<SUP>26</SUP>Mg) signature of dolomites, GEOCHIMICA ET COSMOCHIMICA ACTA, Vol: 149, Pages: 131-151, ISSN: 0016-7037

Journal article

Sowmya K, John CM, Shrivasthava NK, 2015, Urban flood vulnerability zoning of Cochin City, southwest coast of India, using remote sensing and GIS, NATURAL HAZARDS, Vol: 75, Pages: 1271-1286, ISSN: 0921-030X

Journal article

MacDonald J, John C, Girard J-P, 2015, Dolomitization processes in hydrocarbon reservoirs: insight from geothermometry using clumped isotopes, 11th International Symposium on Applied Isotope Geochemistry (AIG), Publisher: ELSEVIER SCIENCE BV, Pages: 265-268, ISSN: 1878-5220

Conference paper

Kluge T, John CM, 2015, Technical Note: A simple method for vaterite precipitation for isotopic studies: implications for bulk and clumped isotope analysis, BIOGEOSCIENCES, Vol: 12, Pages: 3289-3299, ISSN: 1726-4170

Journal article

Quesnel B, Boulvais P, Gautier P, Cathelineau M, John CM, Dierick M, Agrinier P, Drouillet Met al., 2015, Formation of Silica and Magnesite Veins in the Massif of Peridotite of Koniambo: Geometric and Stable Isotopes Data, 13th SGA Biennial Meeting on Mineral Resources in a Sustainable World, Publisher: ASGA-ASSOC SCIENTIFIQUE GEOLOGIE & APPLICATIONS, Pages: 1189-1192

Conference paper

Drury AJ, Lee GP, Pennock GM, John CMet al., 2014, Data report: late Miocene to early Pliocene coccolithophore and foraminiferal preservation at Site U1338 from scanning electron microscopy, Proceedings of the IODP, Publisher: Integrated Ocean Drilling Program

Book chapter

Vandeginste V, John CM, Cosgrove JW, Manning Cet al., 2014, Dimensions, texture-distribution, and geochemical heterogeneities of fracture- related dolomite geobodies hosted in Ediacaran limestones, northern Oman, AAPG BULLETIN, Vol: 98, Pages: 1789-1809, ISSN: 0149-1423

Journal article

Sena CM, John CM, Jourdan A-L, Vandeginste V, Manning Cet al., 2014, DOLOMITIZATION OF LOWER CRETACEOUS PERITIDAL CARBONATES BY MODIFIED SEAWATER: CONSTRAINTS FROM CLUMPED ISOTOPIC PALEOTHERMOMETRY, ELEMENTAL CHEMISTRY, AND STRONTIUM ISOTOPES, JOURNAL OF SEDIMENTARY RESEARCH, Vol: 84, Pages: 552-566, ISSN: 1527-1404

Journal article

Dale A, John CM, Mozley PS, Smalley PC, Muggeridge AHet al., 2014, Time-capsule concretions: unlocking burial diagenetic processes in the Mancos Shale using carbonate clumped isotopes, Earth and Planetary Science Letters, Vol: 394, Pages: 30-37, ISSN: 0012-821X

Journal article

Fitch PJR, Jackson MD, Hampson GJ, John CMet al., 2014, Interaction of stratigraphic and sedimentological heterogeneities with flow in carbonate ramp reservoirs: impact of fluid properties and production strategy, Petroleum Geoscience, Vol: 20, Pages: 7-26, ISSN: 1354-0793

It is well known that heterogeneities in carbonate reservoirs impact fluid flow during production. However, few studies have examined the impact of the same heterogeneities on flow behaviour with different fluid properties and production scenarios. We use integrated flow simulation and experimental design techniques to investigate the relative, first-order impact of stratigraphic and sedimentological heterogeneities on simulated recovery in carbonate ramp reservoirs. Two production strategies are compared, which promote dominance of either horizontal or vertical flow.We find that the modelled geology is more important than the simulated fluid properties and production scenarios over the ranges tested. Of the heterogeneities modelled here, rock properties and stratigraphic heterogeneities that control reservoir architecture and the spatial distribution of environment of deposition (EOD) belts are important controls on recovery regardless of the production strategy. The presence of cemented hardground surfaces becomes the key control on oil recovery in displacements dominated by vertical flow. Permeability anisotropy is of low importance for all production strategies. The impacts of stratigraphic heterogeneities on recovery factor and water breakthrough are more strongly influenced by fluid properties and well spacing in displacements dominated by vertical flow. These results help to streamline the reservoir modelling process, by identifying key heterogeneities, and to optimize production strategies.

Journal article

John CM, Vandeginste V, Jourdan AL, Kluge TM, Davis S, Sena C, Honig M, Beckert Jet al., 2014, Carbonate reservoir analogues and clumped isotopes: How combined geometries and geochemistry of outcrops help reservoir management in the Middle East, Society of Petroleum Engineers - International Petroleum Technology Conference 2014, IPTC 2014: Unlocking Energy Through Innovation, Technology and Capability, Vol: 1, Pages: 533-539

Petroleum geologists working in carbonate plays are facing two common and inter-connected challenges linked to optimizing production. First, constraining the geometry, spatial distribution and inter-connectivity of reservoir geobodies is crucial as these properties can control the permeability anisotropy of reservoirs zones. This is difficult to do at the inter-well scale due to the limited resolution of seismic methods (20 meters or higher) compared to the size of typical reservoir geobodies (tens of centimers to meters and higher) and the very heterogeneous nature of carbonate reservoirs. Furthermore, diagenetic transformations are very important in carbonate reservoirs. Being able to fingerprint the process and timing of diagenetic transformation is crucial to a correct assessement of the distribution of cemented zones in the subsurface. The issue of diagenesis is also important for organic matter maturation and the timing of oil migration, and therefore the second challenge faced by reservoir geologists in carbonate plays is one of constraining as well as possible the thermal history of the targeted basin. This paper reports on the results of a major long-term research effort that addresses some aspects of this double challenge in the Middle East, and that focused on novel isotopic methods to constrain the thermal history of carbonate phases in the context of the geometry of geobodies measured at the outcrop. Geological work under the Qatar Carbonates and Carbon Storage Centre (QCCSRC), funded jointly by Qatar Petroleum, Shell and the Qatar Science & Technology Park, has as its long-term research goals to improve characterization of subsurface anisotropies in carbonate reservoirs, notably for CCS operations. Copyright 2014, International Petroleum Technology Conference.

Journal article

Vandeginste V, John CM, Beckert J, 2014, Diagenetic geobodies: Fracture-controlled burial dolomite bodies in outcrops from Northern Oman, Society of Petroleum Engineers - International Petroleum Technology Conference 2014, IPTC 2014: Unlocking Energy Through Innovation, Technology and Capability, Vol: 2, Pages: 1142-1152

Diagenetic heterogeneities are difficult to predict in subsurface. Nevertheless, such heterogeneities can be crucial in hydrocarbon exploration. Diagenetic processes can significantly alter petrophysical properties of reservoir rocks, especially in carbonate rocks because of the reactive nature of the carbonate minerals. Dolomitization, i.e. the transformation of calcite (limestone) into dolomite, is a common diagenetic process in carbonate rocks. Description: an overview of the learning outcomes gained by studying fracture-related dolomite in outcrops of Oman and subsequent laboratory analysis over the last four years. A combined structural, petrographic and geochemical approach was taken to study three dolomite systems occurring in different stratigraphic host rock intervals. Application: Structurally-controlled dolomitization (i.e. dolomitization along faults and fractures) typically occurs in burial conditions, and the resulting strong permeability anisotropies caused by the dolomite textures can cause major challenges for hydrocarbon exploration. Results and Conclusions: Dolomite bodies in the Precambrian Khufai Formation are related to N-S to NNE-SSW fractures, whereas dolomite bodies that mainly occur in the Jurassic host rocks occur along reactivated WNW-ESE normal faults. These fracture-related dolomite bodies are generally less than 15 m wide, but can be up to a few hundred meters long. Late-diagenetic dolomite bodies were also recognized in Permian host rocks, where they occur at or close to the contact between Permian limestone and early-diagenetic dolomite. This late diagenetic dolomite system can be traced laterally for at least hundreds of meters and occurs in wadi's about 40 km apart. Our data indicate that there were several dolomitization events in the geological history, generating dolomite bodies with different characteristics. Technical Contributions: This highlights the needs to understand the timing and structural setting of dolomite bodies in

Journal article

Satheendran SS, John CM, Faseeh FK, Aanisa KMet al., 2014, DEVELOPMENT OF A WEB GEOSERVICES PLATFORM FOR SCHOOL OF ENVIRONMENTAL SCIENCES, MAHATMA GANDHI UNIVERSITY, KERALA, INDIA, ISPRS Technical Commission VIII Symposium, Publisher: COPERNICUS GESELLSCHAFT MBH, Pages: 1207-1212, ISSN: 2194-9034

Conference paper

John CM, Nath K, 2014, INTEGRATION OF MULTISPECTRAL SATELLITE AND HYPERSPECTRAL FIELD DATA FOR AQUATIC MACROPHYTE STUDIES, ISPRS Technical Commission VIII Symposium, Publisher: COPERNICUS GESELLSCHAFT MBH, Pages: 581-588, ISSN: 2194-9034

Conference paper

Sena CM, John CM, 2013, Impact of dynamic sedimentation on facies heterogeneities in Lower Cretaceous peritidal deposits of central east Oman, SEDIMENTOLOGY, Vol: 60, Pages: 1156-1183, ISSN: 0037-0746

Journal article

Vandeginste V, John CM, van de Flierdt T, Cosgrove JWet al., 2013, Linking process, dimension, texture, and geochemistry in dolomite geobodies: A case study from Wadi Mistal (northern Oman), AAPG BULLETIN, Vol: 97, Pages: 1181-1207, ISSN: 0149-1423

Journal article

Vandeginste V, John CM, Manning C, 2013, Interplay between depositional facies, diagenesis and early fractures in the Early Cretaceous Habshan Formation, Jebel Madar, Oman, MARINE AND PETROLEUM GEOLOGY, Vol: 43, Pages: 489-503, ISSN: 0264-8172

Journal article

Vandeginste V, John CM, 2013, DIAGENETIC IMPLICATIONS OF STYLOLITIZATION IN PELAGIC CARBONATES, CANTERBURY BASIN, OFFSHORE NEW ZEALAND, JOURNAL OF SEDIMENTARY RESEARCH, Vol: 83, Pages: 226-240, ISSN: 1527-1404

Journal article

John CM, Banerjee NR, Longstaffe FJ, Sica C, Law KR, Zachos JCet al., 2012, Clay assemblage and oxygen isotopic constraints on the weathering response to the Paleocene-Eocene thermal maximum, east coast of North America, GEOLOGY, Vol: 40, Pages: 591-594, ISSN: 0091-7613

Journal article

Vandeginste V, John CM, 2012, INFLUENCE OF CLIMATE AND DOLOMITE COMPOSITION ON DEDOLOMITIZATION: INSIGHTS FROM A MULTI-PROXY STUDY IN THE CENTRAL OMAN MOUNTAINS, JOURNAL OF SEDIMENTARY RESEARCH, Vol: 82, Pages: 177-195, ISSN: 1527-1404

Journal article

Milhomme O, John C, Djedaini-Pilard F, Grandjean Cet al., 2011, Access to Antigens Related to Anthrose Using Pivotal Cyclic Sulfite/Sulfate Intermediates, JOURNAL OF ORGANIC CHEMISTRY, Vol: 76, Pages: 5985-5998, ISSN: 0022-3263

Journal article

John CM, Karner GD, Browning E, Leckie RM, Mateo Z, Carson B, Lowery Cet al., 2011, Timing and magnitude of Miocene eustasy derived from the mixed siliciclastic-carbonate stratigraphic record of the northeastern Australian margin, EARTH AND PLANETARY SCIENCE LETTERS, Vol: 304, Pages: 455-467, ISSN: 0012-821X

Journal article

John CM, Sylas VP, Paul J, Unni KSet al., 2009, Floating islands in a tropical wetland of peninsular India, WETLANDS ECOLOGY AND MANAGEMENT, Vol: 17, Pages: 641-653, ISSN: 0923-4861

Journal article

John CM, Adatte T, 2009, Data report: X-ray analyses of bulk sediment in IODP Holes U1320A and U1324B, northern Gulf of Mexico., Proceeding of the Ocean Drilling Program, Expedition 308, Editors: Fleming, Behrmann, John, College Station, TX, Publisher: IODP-MI

Book chapter

Sluijs A, Brinkhuis H, Crouch EM, John CM, Handley L, Munsterman D, Bohaty SM, Zachos JC, Reichart G-J, Schouten S, Pancost RD, Damste JSS, Welters NLD, Lotter AF, Dickens GRet al., 2008, Eustatic variations during the Paleocene-Eocene greenhouse world, PALEOCEANOGRAPHY, Vol: 23, ISSN: 0883-8305

Journal article

Flemings PB, Long H, Dugan B, Germaine J, John CM, Behrmann JH, Sawyer Det al., 2008, Erratum to "Pore pressure penetrometers document high overpressure near the seafloor where multiple submarine landslides have occurred on the continental slope, offshore Louisiana, Gulf of Mexico" (vol 269, pg 309, 2008), EARTH AND PLANETARY SCIENCE LETTERS, Vol: 274, Pages: 269-283, ISSN: 0012-821X

Journal article

John CM, Bohaty SM, Zachos JC, Sluijs A, Gibbs S, Brinkhuis H, Bralower TJet al., 2008, North American continental margin records of the Paleocene-Eocene thermal maximum: Implications for global carbon and hydrological cycling, PALEOCEANOGRAPHY, Vol: 23, ISSN: 0883-8305

Journal article

Fleming PB, Long H, Dugan B, Germaine J, John C, Behrmann JH, Sawyer Det al., 2008, Pore pressure penetrometers document high overpressure near the seafloor where multiple submarine landslides have occurred on the continental slope, offshore Louisiana, Gulf of Mexico, EARTH AND PLANETARY SCIENCE LETTERS, Vol: 269, Pages: 309-324, ISSN: 0012-821X

Journal article

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