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3D Pore Structure Investigation of Albian Carbonates from Campos Basin

DOI: 10.3997/2214-4609.20141280 DOI Help

Authors: N. Lopes Archilha (Research Complex at Harwell) , R. M. Missagia (North Fluminense State University) , C. Hollis (University of Manchester) , M A R Ceia (Universidade Estadual do Norte Fluminense) , I A Lima Neto (Universidade Estadual do Norte Fluminense) , D. Eastwood (University of Manchester)
Co-authored by industrial partner: No

Type: Conference Paper
Conference: 76th EAGE Conference and Exhibition 2014
Peer Reviewed: No

State: Published (Approved)
Published: June 2014
Diamond Proposal Number(s): 4017

Abstract: The pore structure of three samples from two neighbouring wells in the Campos Basin, offshore Brazil, were investigated by high resolution X-ray tomography. The samples show an inverse relationship between velocity and porosity and velocity and permeability, but there are important deviations on those trends. In order to explain this behavior, the sample pore structure was investigated using a high resolution ┬ÁCT. This technique provided reliable information about 3D geometry of macropores and allowed estimation of the volume of microporosity. The analysis showed an expressive difference between the pore size of samples with different textures, but not enough information to explain differences in RQI values, suggesting that other parameters, like tortuosity, are controlling permeability. The aspect ratio (ratio between width and length) does not offer a clear control on velocity trend deviation, suggesting that small differences in rock texture or cement distribution might be in control of acoustic properties of these rocks.

Subject Areas: Earth Science


Instruments: I13-2-Diamond Manchester Imaging