Lithologic Reservoirs ›› 2017, Vol. 29 ›› Issue (3): 92-102.doi: 10.3969/j.issn.1673-8926.2017.03.011

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Permeability modeling based on the classification of beach-controlled karst dolomite reservoirs: a case from Longwangmiao Formation in Moxi-Gaoshiti area, central Sichuan Basin

SIMA Liqiang1, CHEN Zhiqiang1, WANG Liang1, FAN Ling2, CHEN Hebin1, FU Yonghong1   

  1. 1. School of Geoscience and Technology, Southwest Petroleum University, Chengdu 610500, China;
    2. Central Sichuan Oil and Gas Field, PetroChina Southwest Oil and Gas Field Company, Suining 629000, Sichuan, China
  • Received:2016-09-09 Revised:2016-12-13 Online:2017-05-21 Published:2017-05-21

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Abstract: Reservoir permeability is greatly affected by karstification, and the applicability of existing permeability models is poor in Cambrian dolomite reservoirs of Longwangmiao Formation, Moxi-Gaoshiti area, central Sichuan Basin. The core photos, rock slices, mercury injection capillary pressure, nuclear magnetic resonance and logging data were used to classify the reservoir types according to karstification,reservoir space and pore structure. The beach-controlled karst dolomite reservoirs with strong heterogeneity were divided into karst cave type, dissolved pore type and matrix pore type. Then, new permeability models were established with physical property analysis data of full diameter core and standard plunger core by the difference between their characterization scale. Full diameter core has larger scale of representation, so as to establish the permeability interpretation model of karst cave type; standard plunger core has smaller scale of representation, so as to establish permeability interpretation models of dissolved pore type and matrix pore type. Practical application results show that, compared with the conventional Timur formula and NMR Coates model, the permeability value calculated by classified statistic models is more consistent with core analysis. This method can effectively improve the accuracy of permeability calculation in beach-controlled karst reservoirs.

Key words: diagenesis, diagenetic facies, Chang 8 reservoir, Maling Oilfield, Ordos Basin

CLC Number: 

  • TE122
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