Abstract
Carbonate sediments within the Mid-Cretaceous Callovian-Oxfordian formation form an important reservoir at Bereketli-Pirgui gas field on the right bank of Amu Darya, Turkmenistan. The reservoir properties are mainly controlled by early deposition and later diagenetic modification. The sedimentary micro-facies in research area are mainly gentle-slope reef-shoal and inter-shoal, the reservoir quality was improved after later dissolution, dolomitization and fracturing.
In this paper, petrophysical data, core data, conventional thin sections and mercury injection data were used comprehensively to classify flow unit through flow zone index method. Eight flow units were derived, including five flow units in inter-shoal micro-facies, three flow units in reef-shoal micro-facies.
Research results prove that each flow unit has unique porosity, permeability, irreducible water saturation and pore throat distribution. Grainstone and packstone deposits from high energy depositional environments (reef-shoal) had the highest porosity. However, the porosity and permeability of these rocks were frequently decreased due to cementation and silicification. By contrast, mudstone or wackestone deposits had undergone fracturing, forming highly permeable flow units (such as FU1 and FU2). Capillary pressure curves can give an indication of the productivity of each flow unit.
Copyright 2019, IFEDC Organizing Committee.
This paper was prepared for presentation at the 2019 International Field Exploration and Development Conference in Xi’an, China, 16–18 October 2019.
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Acknowledgments
The authors would like to thank the management of RIPED for authorizing the presentation of this work. The project is supported by China National Science and Technology Major Project (2017ZX05030-003)
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Xing, Yz., Guo, Cq., Cheng, Mw., Yang, Ht., Shi, Hd., Chen, Py. (2020). Flow Unit Classification and Characterization of Callovian-Oxfordian Carbonate Reservoir: Bereketli-Pirgui Gas Field, the Right Bank of Amu Darya. In: Lin, J. (eds) Proceedings of the International Field Exploration and Development Conference 2019. IFEDC 2019. Springer Series in Geomechanics and Geoengineering. Springer, Singapore. https://doi.org/10.1007/978-981-15-2485-1_211
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DOI: https://doi.org/10.1007/978-981-15-2485-1_211
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