The Open Petroleum Engineering Journal


ISSN: 1874-8341 ― Volume 12, 2019

New Reservoir Grading Method for Tight Gas Reservoir – One Case Study in Kekeya Block, Tuha Basin, China

The Open Petroleum Engineering Journal , 2015, 8: 167-171

Fangfang Wu, Jinchuan Zhang, Liuzhong Li, Jinlong Wu

School of Energy Resources, China University of Geosciences, No. 29 Xueyuan Road, Haidian District, Beijing, 100083, P.R.China.

Electronic publication date 29/5/2015
[DOI: 10.2174/1874834101508010167]

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Tight sand reservoir is usually characterized by high heterogeneity and complex pore structure, which makes the permeability calculation a big challenge and leads to difficulties in reservoir classification and productivity evaluation. First, five different Hydraulic Flow Units and respective Porosity-permeability relations were built based on core dataset from Kekeya block, Tuha Basin; and then with BP Neutron Network method, flow unit was classified for un-cored intervals using normalized logging data, and permeability was calculated accordingly. This improved the accuracy of permeability calculation and helped a lot on un-cored reservoir evaluation. In addition, based on porosity, permeability and flow unit type, a new reservoir grading chart was set up by incorporating the testing or production data, which provides important guidance for productivity prediction and reservoir development.

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