Geological interpretation of channelized heterolithic beds through well test analysis

Rafael Osorio, Amin Sharifi Haddad, Ed Stephens, Hossein Hamidi

Research output: Contribution to journalArticle

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3 Downloads (Pure)

Abstract

Well test analysis is a valuable tool to measure the dynamic response of a reservoir through determination of the hydraulic connectivity and effective permeability of the reservoir. Analytical models in well test analysis, are developed based on a simple geological structures, to provide reasonably good approximations for the description and performance of such reservoirs. Nevertheless, most prolific reservoirs such as channelized systems consist of sedimentological features with high degrees of heterogeneity that influence the pressure transient response where using conventional analytical models may result in misleading interpretations. The focus of the current study is on reservoirs which depositional environment corresponds to a main channel feature incising into heterolithic beds in lateral continuity. Analysis of the pressure response demonstrated that it can be used as a tool to predict the
equivalent isotropic horizontal permeability of the channel. We explored that the ratio of well test permeabilities between the radial flows can lead to the identification of a secondary geological body next to channel. Thus, it can be used to find the distance of the interface between channel and heterolithic. The results of this study showed that particular features of pressure and its derivative curves from a channel-heterolithic system are useful well testing
signatures for reservoir characterisation. Therefore, we proposed an algorithm for the recognition of pressure trends and the development of relationships to be used for well test interpretation of heterogeneous oil and gas reservoirs.
Original languageEnglish
Pages (from-to)516-528
Number of pages13
JournalJournal of Petroleum Science and Engineering
Volume158
Early online date4 Sep 2017
DOIs
Publication statusPublished - Sep 2017

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well
Analytical models
permeability
Well testing
Radial flow
well testing
radial flow
Transient analysis
reservoir characterization
Dynamic response
dynamic response
geological structure
depositional environment
Hydraulics
connectivity
Derivatives
analysis
test
hydraulics
Gases

Keywords

  • well test
  • channelized heterolithic
  • geological heterogeneity
  • channel sand

Cite this

Geological interpretation of channelized heterolithic beds through well test analysis. / Osorio, Rafael; Sharifi Haddad, Amin; Stephens, Ed; Hamidi, Hossein.

In: Journal of Petroleum Science and Engineering, Vol. 158, 09.2017, p. 516-528.

Research output: Contribution to journalArticle

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