Published

2018-01-01

Petrophysical properties of the Lower Cretaceous formations in the Shaikhan oilfield, northern Iraq

Propiedades petrofísicas de las Formaciones del Cretácico Temprano en el campo petrolero de Shaikhan, en el Norte de Irak

DOI:

https://doi.org/10.15446/esrj.v22n1.66088

Keywords:

Qamchuqa, Sarmord, Garagu, Shale Volume, Porosity, Saturation, (en)
Qamchuqa, Sarmord, Garagu, volumen de esquistos, porosidad, saturación, (es)

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Authors

  • Wria Jihad Jabbar
  • Srood Farooq Naqshabandi
  • Falah Khalaf Al-Juboury

The current study represents an evaluation of the petrophysical properties in the well Shaikhan-8 for the Garagu, Sarmord and Qamchuqa formations in Shaikhan oilfield, Duhok basin, northern Iraq. The petrophysical evaluation is based on well logs data to delineate the reservoir characteristics. The environmental corrections and petrophysical parameters such as porosity, water saturation, and hydrocarbon saturation are computed and interpreted using Interactive Petrophysics (IP) program. Neutron-density crossplot is used to identify lithological properties. The Qamchuqa Formation in the Shaikhan oilfield consists mainly of dolomite with dolomitic limestone, and the average clay volume is about 13%; while Sarmord Formation composed of limestone and dolomitic limestone, the average clay volume in this formation is about 19%; also the Garagu Formation consists mainly of limestone and dolomitic limestone in addition to sandstone and claystone, the volume of clay in the Garagu Formation is about 20%. Pickett plot method is used to calculate formation water resistivity (Rw), saturation exponent (n) and cementation exponent (m) the values are 0.065ohm, 2, and 2.06 respectively. The porosity ratio (Ø) of the Qamchuqa Formation ranges between 7-15%; this indicates that the lower part of the formation has a poor-fair porosity (7%), while the upper part of the formation has a good porosity (15%). The porosity value decrease toward Sarmord Formation especially in the lower part of the formation, it has a poor porosity (5%), whereas this value reaches to 13% in the upper part of the formation, indicates for fair porosity. Garagu Formation has good porosity, reaches 20% in the lower part, but in the upper part of the formation, this value decreases to 3%. Water saturation (Sw) value which is calculated by Archie equation ranges between 14-33%, while saturation in the flushed zone (Sxo) ranges between 52-73%, these indicate for good movable hydrocarbons are present in the studied interval (840-1320m), and from the total 480m the Early Cretaceous formations in well Shaikhan-8 have 178m pay. 

Este estudio presenta una evaluación de las propiedades petrofísicas en el pozo Shaikhan-8 para las formaciones Garagu, Sarmord y Qamchuga, en el campo petrolero de Shikhan, cuenca Duhok, al norte de Irak. La evaluación petrofísica se basó en la información de registro de pozos, lo que permitió delinear las características del depósito. Las correcciones ambientales y los parámetros petrofísicos como porosidad, saturación del agua, y saturación de hidrocarburo se calcularon e interpretaron a través del programa Interactive Petrophysics (IP). La gráfica de interrelación de densidad de neutrones se utilizó para identificar propiedades litológicas. La Formación Qamchuqa consiste principalmente de dolomita y caliza dolomítica, y el promedio de volumen arcilloso es cercano al 13 %; mientras que la Formación Sarmord se compone de caliza y caliza dolomítica, con un promedio de volumen arcilloso de 19 %; la Formación Garagu está formada por caliza y caliza dolomítica con adición de arenisca y arcillolitas, y su volumen arcilloso es de 20 %. La gráfica de Pickett se utilizó para calcular en las formaciones la resistividad del agua (Rw), el exponente de saturación (n) y el exponente de cementación (m); los resultados en las tres formaciones de estudio fueron de 0.065ohm, 2, y 2.06. La proporción de porosidad (Ø) de la Formación Qamchuqa oscila entre 7 y 15 %; esto indica que la parte más baja de la formación tiene una porosidad entre regular y baja (7 %), mientras que la parte más alta tiene un alto índice de porosidad (15 %). El valor de porosidad cae hace la Formación Sarmord, especialmente en su parte más baja donde tiene un índice bajo (5 %), mientras que en la parte alta alcanza el 13 %, lo que indica un nivel regular. La Formación Garagu tiene un buen índice de porosidad que alcanza el 20 % en la parte más baja, pero que en la parte alta cae al 3 %. El valor de saturación de agua (Sw), que se calcula por la ecuación de Archie, oscila entre el 14 y el 33 %, mientras que la saturación en la zona lavada (Sxo) oscila entre el 52 y el 73 %; esto demuestra que los hidrocarburos móviles están presentes en el intervalo de estudio (840-1320m), y que del total de 480 metros de las formaciones del Cretácico Temprano en el pozo Shaikhan-8, aproximadamente 178 metros de zona productora. 

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How to Cite

APA

Jabbar, W. J., Naqshabandi, S. F. and Al-Juboury, F. K. (2018). Petrophysical properties of the Lower Cretaceous formations in the Shaikhan oilfield, northern Iraq. Earth Sciences Research Journal, 22(1), 45–52. https://doi.org/10.15446/esrj.v22n1.66088

ACM

[1]
Jabbar, W.J., Naqshabandi, S.F. and Al-Juboury, F.K. 2018. Petrophysical properties of the Lower Cretaceous formations in the Shaikhan oilfield, northern Iraq. Earth Sciences Research Journal. 22, 1 (Jan. 2018), 45–52. DOI:https://doi.org/10.15446/esrj.v22n1.66088.

ACS

(1)
Jabbar, W. J.; Naqshabandi, S. F.; Al-Juboury, F. K. Petrophysical properties of the Lower Cretaceous formations in the Shaikhan oilfield, northern Iraq. Earth sci. res. j. 2018, 22, 45-52.

ABNT

JABBAR, W. J.; NAQSHABANDI, S. F.; AL-JUBOURY, F. K. Petrophysical properties of the Lower Cretaceous formations in the Shaikhan oilfield, northern Iraq. Earth Sciences Research Journal, [S. l.], v. 22, n. 1, p. 45–52, 2018. DOI: 10.15446/esrj.v22n1.66088. Disponível em: https://revistas.unal.edu.co/index.php/esrj/article/view/66088. Acesso em: 29 mar. 2024.

Chicago

Jabbar, Wria Jihad, Srood Farooq Naqshabandi, and Falah Khalaf Al-Juboury. 2018. “Petrophysical properties of the Lower Cretaceous formations in the Shaikhan oilfield, northern Iraq”. Earth Sciences Research Journal 22 (1):45-52. https://doi.org/10.15446/esrj.v22n1.66088.

Harvard

Jabbar, W. J., Naqshabandi, S. F. and Al-Juboury, F. K. (2018) “Petrophysical properties of the Lower Cretaceous formations in the Shaikhan oilfield, northern Iraq”, Earth Sciences Research Journal, 22(1), pp. 45–52. doi: 10.15446/esrj.v22n1.66088.

IEEE

[1]
W. J. Jabbar, S. F. Naqshabandi, and F. K. Al-Juboury, “Petrophysical properties of the Lower Cretaceous formations in the Shaikhan oilfield, northern Iraq”, Earth sci. res. j., vol. 22, no. 1, pp. 45–52, Jan. 2018.

MLA

Jabbar, W. J., S. F. Naqshabandi, and F. K. Al-Juboury. “Petrophysical properties of the Lower Cretaceous formations in the Shaikhan oilfield, northern Iraq”. Earth Sciences Research Journal, vol. 22, no. 1, Jan. 2018, pp. 45-52, doi:10.15446/esrj.v22n1.66088.

Turabian

Jabbar, Wria Jihad, Srood Farooq Naqshabandi, and Falah Khalaf Al-Juboury. “Petrophysical properties of the Lower Cretaceous formations in the Shaikhan oilfield, northern Iraq”. Earth Sciences Research Journal 22, no. 1 (January 1, 2018): 45–52. Accessed March 29, 2024. https://revistas.unal.edu.co/index.php/esrj/article/view/66088.

Vancouver

1.
Jabbar WJ, Naqshabandi SF, Al-Juboury FK. Petrophysical properties of the Lower Cretaceous formations in the Shaikhan oilfield, northern Iraq. Earth sci. res. j. [Internet]. 2018 Jan. 1 [cited 2024 Mar. 29];22(1):45-52. Available from: https://revistas.unal.edu.co/index.php/esrj/article/view/66088

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