An improved saturation evaluation method of Chang 8 tight sandstone reservoir in Longdong West area of Ordos Basin, China

Author:

Bai Ze12ORCID,Tan Maojin2,Shi Yujiang3,Zhang Haitao3,Li Gaoren3

Affiliation:

1. School of Earth and Environment, Anhui University of Science and Technology, Huainan, China

2. School of Geophysics and Information Technology, China University of Geosciences, Beijing, China

3. Research Institute of Exploration and Development, PetroChina Changqing Oilfield Company, Xi’an, China

Abstract

This study focus on saturation evaluation of Chang 8 tight sandstone reservoir in Longdong West area of Ordos Basin, China. An improved saturation calculation method was proposed based on the equivalent rock capillary bundle theory. Firstly, according to characteristics of reservoir pore structure and rock conductivity, the conductive space of reservoir rock is equivalent to the parallel conductive of micro capillary bundle representing the micro pores and the coarse capillary bundle representing the macro pores. Then, the variable cementation index(m) saturation model was deduced by using Poiseuille flow equation and Darcy's law. During the calculation of model parameters, the T2 spectrum data of nuclear magnetic resonance (NMR) was used to calculate the equivalent radius of reservoir micro pores and macro pores, which ensured the ability of model popularization and application. Finally, the proposed saturation calculation method is applied to reservoir evaluation of the study area, and compared with the classical Archie saturation model. The application effect shows that the calculated saturation from the proposed variable m model is much closer to the sealed coring data than that from classical Archie model, and the average relative error of saturation calculated by the variable m model is within 7%, which proves that the proposed saturation calculation method is applicable and effective.

Funder

National Natural Science Foundation of China

The Introduced Talent Fund of Anhui University of Science and Technology

National Major Projects “Log Interpretation and Evaluation of Complex Oil and Water Layers”

Publisher

SAGE Publications

Subject

Energy Engineering and Power Technology,Fuel Technology,Nuclear Energy and Engineering,Renewable Energy, Sustainability and the Environment

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