Lacustrine carbonates: For the purpose of reservoir characterisation are they different?

Patrick W. M. Corbett, Leonardo Borghi

Research output: Chapter in Book/Report/Conference proceedingConference contribution

11 Citations (Scopus)

Abstract

The reservoir characterisation of lacustrine carbonates is currently challenging, as historically they are not common as major carbonate reservoirs and therefore have been less studied in terms of reservoir characterization. The giant discoveries of the Pre-Salt of the South Atlantic Margin in Brazil have introduced lacustrine carbonates as a major target for exploration and development and are driving new research. Lacustrine carbonates are formed in lakes which are particularly sensitive to salinity, pH, water level and sediment supply variations. This variability results in a wide range of primary fabric types and associated porosity types, likely formed by the interaction of microbial and chemical processes. Lacustrine grainstones can be formed from spherulites or coquinas and stromatolites and stromatolite bioherms can form cavities and laminated pore systems. Shrub morphologies are found that can form complex pore networks. These fabric types can be affected by a series of diagenetic processes that can both enhance and occlude porosity. In this paper, we review how porosity in these systems may be characterised in thin sections and using micro-CT and how permeability and resistivity might be determined in the laboratory or by 3-D modelling. We also address how rock types may be determined by analysis of capillary pressure data, to determine relative permeabilities for different rock types. This paper addresses some classical reservoir characterisation issues that are likely to be important in these reservoirs. The approach considered here emphasises an integrated link between petrography, facies analysis (outcrop studies) and porosity description in a petrophysically-based rock typing framework appropriate for geomodelling, upscaling and calibration with dynamic data. This reservoir characterisation workflow methodology is applicable to all carbonates, however, it is recognized that lacustrine carbonates present some special challenges.

Original languageEnglish
Title of host publicationOffshore Technology Conference 2013
Subtitle of host publicationFrom North to South: A Wealth of Opportunities
PublisherOffshore Technology Conference
Pages1708-1716
Number of pages9
Volume3
ISBN (Print)9781629933887
Publication statusPublished - 2013
EventOTC Brasil 2013 - Rio de Janeiro, Brazil
Duration: 29 Oct 201331 Oct 2013

Publication series

NameProceedings of the Annual Offshore Technology Conference
ISSN (Print)0160-3663

Conference

ConferenceOTC Brasil 2013
CountryBrazil
CityRio de Janeiro
Period29/10/1331/10/13

ASJC Scopus subject areas

  • Safety, Risk, Reliability and Quality
  • Ocean Engineering
  • Energy Engineering and Power Technology
  • Mechanical Engineering

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