Comprehensive Evaluation Method for the Low Permeability#br#
Carbonate Reservoir

doi:10.11885/j.issn.1674-5086.2014.08.10.02

Abstract

Abstract:

The low permeability carbonate reservoir is an important oil reservoir type developed overseas by PetroChina. Due
to the complex structures of microscopic pore-throat and apparent differences with low permeability sandstone reservoir，it
is necessary to research on the evaluation method of the low permeability carbonate reservoirs. Based on the test of 550 low
permeability carbonate cores，the mainstream throat radius，the movable fluid percentage，the threshold gradient and the crude
oil viscosity are determined to be the four paramenters to evaluate the low permeability carbonate reservoir. The research shows
that the throat radius changes largely at the low permeability carbonate cores with different permeability and the full diameter
cores′ gas permeability has a semi-logarithmic relationship with the percentage of movable fluid. Besides，under the condition
of same permeability，most throat radius of low permeability carbonate cores is smaller than that of low permeability sandstone，
while the movable fluid percentage of carbonate is larger than that of sandstone which is in agreement with the reservoir property.
Based on the results，four-factor classification of low permeability carbonate reservoir is put forward and the comprehensive
evaluation method is hence introduced，which is successfully applied to the evaluation of the layers in a typical low permeability
carbonate reservoir overseas.

Key words: low permeability carbonate oil reservoir, reservoir evaluation, throat, movable fluid, threshold gradient

CLC Number:

TE311

YANG Zhengming1，2*, JIANG Shuai1，2, ZHANG Yapu1，2, ZHU Guangya3, GUO Hekun1，2. Comprehensive Evaluation Method for the Low Permeability#br# Carbonate Reservoir[J]. 西南石油大学学报(自然科学版), DOI: 10.11885/j.issn.1674-5086.2014.08.10.02.

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Comprehensive Evaluation Method for the Low Permeability#br# Carbonate Reservoir

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