PORE TYPE DETERMINATION BY USING VELOCITY DEVIATION LOG IN DARIYAN FORMATION OF SOUTH PARS GAS FIELD

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ASLANI R.; KADKHODAIE A.; MAHARI R.; ASADI A.

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Journal: JOURNAL OF GEOTECHNICAL GEOLOGY (APPLIED GEOLOGY) Year:2013 | Volume:9 | Issue:1 Page(s): 1-9

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Title

PORE TYPE DETERMINATION BY USING VELOCITY DEVIATION LOG IN DARIYAN FORMATION OF SOUTH PARS GAS FIELD

Author(s)

ASLANI R. | KADKHODAIE A. | MAHARI R. | ASADI A. | Issue Writer Certificate

Keywords

NEUTRON LOGQ2

DENSITY LOGQ2

SONIC LOGQ2

DARIYAN FORMATIONQ2

SOUTH PARS FIELDQ2

Abstract

The SOUTH PARS FIELD, one of the largest gas and condensate resources in the Persian Gulf is located at the border of Iran and Qatar. The DARIYAN FORMATION plays the role of a reservoir rock in this field, which is a sequence of limestone, shale and marl lithology. The most important processes affecting diagenetic facies are dissolution, cementation, compaction, and fracture development, while dissolution is the most important one for improving the reservoir quality of DARIYAN FORMATION. Total porosity of DARIYAN FORMATION is about 20 to 25%, while the effective porosity of the reservoir is considerably lower than total porosity due to blocked fractures. Consequently, the reservoir quality of Dariyan is poor. Open fractures are the main factors of high permeability. Porosity is a basic parameter determination of oil in place and characterization of rock fabrics. The neutron, density and sonic are the conventional porosity logs. The obtained porosity of these logs is not certainly equal to each other and real porosity of the rock because the logging tools do not measure the porosity. The tools measure physical reactions in well and then convert it to porosity. Porosity value is not only the output of these logs but also the pore type of reservoirs can be determined through these logs. Velocity deviation log, obtained from combination of neutron and SONIC LOGs, is a tool from which some information can be obtained for determining the main pore types of carbonate rocks. This log curve is built using neutron-density and SONIC LOGs, synthetically. First, velocity deviation log is built synthetically, and then the amount of log’s deviation represents the pore type. In this study, the results of velocity deviation log were compared to porosities from petrographic study to evaluate the performance of the method in pore type determination. The results show that thin section porosity shows a good agreement with velocity deviation log results. Therefore, velocity deviation log in conjunction with other logs is a useful tool for pore type determination in carbonate rocks. The data from two wells (Spo1, Spo2) of the DARIYAN FORMATION, South Pars Gas Field was used. The DARIYAN FORMATION in the studied wells is made of carbonates with lithology of mainly lime with shale interlayers.

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APA: Copy

ASLANI, R., KADKHODAIE, A., MAHARI, R., & ASADI, A.. (2013). PORE TYPE DETERMINATION BY USING VELOCITY DEVIATION LOG IN DARIYAN FORMATION OF SOUTH PARS GAS FIELD. JOURNAL OF GEOTECHNICAL GEOLOGY (APPLIED GEOLOGY), 9(1), 1-9. SID. https://sid.ir/paper/127026/en

Vancouver: Copy

ASLANI R., KADKHODAIE A., MAHARI R., ASADI A.. PORE TYPE DETERMINATION BY USING VELOCITY DEVIATION LOG IN DARIYAN FORMATION OF SOUTH PARS GAS FIELD. JOURNAL OF GEOTECHNICAL GEOLOGY (APPLIED GEOLOGY)[Internet]. 2013;9(1):1-9. Available from: https://sid.ir/paper/127026/en

IEEE: Copy

R. ASLANI, A. KADKHODAIE, R. MAHARI, and A. ASADI, “PORE TYPE DETERMINATION BY USING VELOCITY DEVIATION LOG IN DARIYAN FORMATION OF SOUTH PARS GAS FIELD,” JOURNAL OF GEOTECHNICAL GEOLOGY (APPLIED GEOLOGY), vol. 9, no. 1, pp. 1–9, 2013, [Online]. Available: https://sid.ir/paper/127026/en

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