Convection in a North Sea oil reservoir; inferences on diagenesis and hydrocarbon mitigation

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Authors:Rabinowicz, Michel; Dandurand, Jean-Louis; Jakubowski, Marc; Schott, Jacques; Cassan, Jean-Pierre
Author Affiliations:Primary:
CNES/GRGS, Toulouse, France
Other:
Lab. Mineral. and Cristallogr., France
S.N.E.A., France
Volume Title:Earth and Planetary Science Letters
Source:Earth and Planetary Science Letters, 74(4), p.387-404. Publisher: Elsevier, Amsterdam, Netherlands. ISSN: 0012-821X
Publication Date:1985
Note:In English. 50 refs.; 2 tables
Summary:Cores drilled in a North Sea oilfield reveal the existence of a siliceous level with an extremely low porosity and permeability interbedded in the Chalk oil reservoir. It is proposed that this silicification documents the mass transfer induced by a porous convective flow within the microfractured Chalk. Numerical modelling of such circulation is shown to support such a hypothesis. The precipitation of silica and calcite within the microfractures induced by convection decreases the effective permeability of the Chalk and destroys the convective circulation after a few m.y. It is also proposed that such a circulation can be a driving mechanism for oil migration. [P.Br.]
Subjects:Carbonate rocks; Chalk; Convection currents; Cores; Currents; Diagenesis; Economic geology; Genesis; Hydrocarbons; Mathematical models; Migration; Oil and gas fields; Organic compounds; Permeability; Petroleum; Porosity; Pressure solution; Processes; Reservoirs; Sedimentary petrology; Sedimentary rocks; Silicification; Atlantic Ocean; North Atlantic; North Sea; Organic materials
Abstract Numbers:86M/2479
Record ID:1986014016
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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