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Petrophysical evaluation study of Khasib Formation in Amara oil field, South Eastern Iraq

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Abstract

The current study represents evaluation of petrophysical properties for Khasib Formation in four wells of Amara oil field (Am-1, Am-2, Am-5, and Am-6). The petrophysical evaluation was based on well logs and core plug data to delineate the petrophysical characteristics of Khasib Formation. The available well logs such as (sonic, density, neutron, gamma ray, SP, and resistivity logs) are digitized using the Didger software package. The environmental corrections and petrophysical parameters such as porosity, water saturation, hydrocarbon saturation, bulk water volume, etc. were computed and interpreted using Interactive Petrophysics program. Net-to-gross (NTG) values of Khasib reservoir were calculated using core plug data (porosity and permeability). Lithological and mineralogical studies using porosity combination cross plots show that Khasib Formation consists mainly of limestone with shale at the bottom of the formation and the essential mineral components are dominantly calcite. Interpretation of petrophysical characteristics indicate that the Khasib Formation consists of three units: upper Khasib, middle Khasib, and lower Khasib. Middle Khasib represents the principal oil-bearing unit in Khasib Formation.

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Abbreviations

Am-1:

Amara Well-1

Am-2:

Amara Well-2

Am-5:

Amara Well-5

Am-6:

Amara Well-6

a:

Tortuosity factor

BVW:

Bulk volume water

CPI:

Computer Processing Interpretation

F:

formation resistivity factor

GR:

Gamma ray log

m:

cementation exponent in Archie equation

n:

saturation exponent in Archie equation

PHIN:

Neutron log

PHIT:

Total porosity

PHIE:

Effective porosity

RHOB:

Density log

Rw:

Resistivity of water formation

Rt:

Resistivity of uninvaded zone

Rxo:

Resistivity of invaded zone

Sw:

water saturation in uninvaded zone

Sxo:

Water saturation in invaded zone

SPI:

Secondary porosity index

Δtma:

sonis transit time in rock matrix

Δtmaa:

Apparent sonis transit time in rock matrix

ΔT (DT):

Sonic transit time

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Author information

Authors and Affiliations

  1. Department of Geology, College of Science, University of Baghdad, Baghdad, Iraq

    Buraq Adnan Al-Baldawi

Authors
  1. Buraq Adnan Al-Baldawi
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Correspondence to Buraq Adnan Al-Baldawi.

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Al-Baldawi, B.A. Petrophysical evaluation study of Khasib Formation in Amara oil field, South Eastern Iraq. Arab J Geosci 8, 2051–2059 (2015). https://doi.org/10.1007/s12517-014-1371-5

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  • DOI: https://doi.org/10.1007/s12517-014-1371-5

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