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Type: Theses
Title: Origin of overpressure and pore pressure prediction in carbonate reservoirs of the Abadan Plain Basin
Author: Atashbari, Vahid
Issue Date: 2016
School/Discipline: Australian School of Petroleum
Abstract: This thesis analyses overpressure throughout the Abadan Plain Basin and evaluates pore pressure in this basin using conventional petroleum industry methods, as well as two new proposed pore pressure prediction methods. Overpressures in the Abadan Plain Basin are primarily exist within carbonates, whereas most previously published overpressure analysis has been undertaken in shale-dominated clastic rocks. Overpressure in this basin is encountered in two main zones, primarily the Gachsaran and Gadvan/Fahliyan formations. South-west to north-east oriented thickening and shortening, as result of Arabia-Eurasia collision, has affected the pressure regime within the Gachsaran Formation, but seemed ineffectual to the Gadvan and Fahliyan overpressures. In order to analyse overpressure origins and test conventional pore pressure prediction methods, a discrimination scheme was applied to remove the impact of lithology on the log recordings, resulting in isolating the minor shale interbeds within, and as a representative of, the carbonate sequences. Disequilibrium compaction was identified as the primary origin of overpressure in the Abadan Plain Basin. Eaton’s (1972) pore pressure prediction method was applied on the filtered shale data with an exponent of 1.0 for sonic velocity, 0.1 for resistivity, and 5 for density data. Bowers’ (1995) method was also tested and, while it accurately predicted pore pressure in the Gadvan and Fahliyan formations, it underestimates pore pressure in shallower formations. This thesis also introduces a new ‘compressibility method’ for pore pressure prediction, developed by the author, that uses porosity-compressibility correlations. This new ‘compressibility method’ provided reliable pore pressure prediction results in the studied wells. Alternatively, overpressure as a result of sediment compaction is also estimated using Biot’s (1941) general theory of three-dimensional consolidation. A generalised compaction model was constructed, and the resulting modelled pore pressure provides a reasonable estimate of observed pore pressure.
Advisor: Tingay, Mark Robert Paul
Amrouch, Khalid
King, Rosalind Clare
Dissertation Note: Thesis (Ph.D.) -- University of Adelaide, Australian School of Petroleum, 2016.
Keywords: overpressure
pore pressure predicition
Abadan Plain
vertical stress
shale discrimination
Provenance: This electronic version is made publicly available by the University of Adelaide in accordance with its open access policy for student theses. Copyright in this thesis remains with the author. This thesis may incorporate third party material which has been used by the author pursuant to Fair Dealing exceptions. If you are the owner of any included third party copyright material you wish to be removed from this electronic version, please complete the take down form located at:
DOI: 10.4225/55/58bf6bd59953e
Appears in Collections:Research Theses

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