Lithologic Reservoirs ›› 2019, Vol. 31 ›› Issue (5): 70-83.doi: 10.12108/yxyqc.20190508

• EXPLORATION TECHNOLOGY • Previous Articles     Next Articles

Analysis and logging identification of diagenetic facies of dolomite reservoir with low and ultra-low permeability:a case study from Ma 5 member in Yishan slope,Ordos Basin

LI Baiqiang1, ZHANG Xiaoli1, WANG Qicong2, GUO Bincheng3, GUO Yanqin2, SHANG Xiaoqing2, CHENG Hao2, LU Junhui1, ZHAO Xi1   

  1. 1. Department of Geology, Northwest University/National & Local Joint Engineering Research Center of Carbon Capture and Storage Technology, Xi'an 710069, China;
    2. School of Earth Sciences and Engineering, Xi'an Shiyou University, Xi'an 710065, China;
    3. PetroChina Research Institute of Petroleum Exploration and Development, Beijing 100083, China
  • Received:2019-01-30 Revised:2019-04-03 Online:2019-09-21 Published:2019-09-16

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Abstract: In order to study the logging identification method and quantitative classification of diagenetic facies of dolostone reservoir with low and ultra-low permeability and clarify the spatial distribution characteristics of diagenetic facies and the favorable exploration area of dolostone reservoir". Based on core observation,identification of ordinary and casting thin section,and cathodoluminescence analysis,combined with X-ray diffraction and physical property data,the diagenetic environment and diagenesis of dolomite reservoir with low and ultralow permeability of Ma 5 member in Yishan slope were analyzed. Then the quantitative identification standard for diagenetic facies of dolomite reservoir with low and ultra-low permeability was established through the crossplot analysis of conventional logging curves and application of software program. The results show that the diagenetic facies of the dolomite reservoirs with low and ultra-low permeability can be divided into six types:early atmospheric freshwater dissolution,supergene atmospheric freshwater dissolution,shallow buried active reflux seepage dolomitization,shallow buried latent reflux seepage dolomitization,calcareous cementation and clay minerals filling. The crossplot method of logging parameters represented by Pe and DEN,RLLD and DEN,and RLLD and AC,and the comprehensive application of software program are effective approach for vertical quantitative identification and continuous division of different diagenetic facies of dolostone reservoir with low and ultralow permeability in single well. The spatial distribution of diagenetic facies of dolostone reservoir shows a typical characteristic of longitudinal zonation and planar partition. The favorable reservoirs are mainly developed in diagenetic facies of early atmospheric freshwater dissolution and shallow buried active reflux seepage dolomitization,followed by supergene atmospheric freshwater dissolution,and there is less reservoir deve-loped in shallow buried latent reflux seepage dolomitization diagenetic subfacies.

Key words: low and ultra-low permeability, dolomite reservoir, diagenetic facies, logging identification, Ma 5 member, Ordos Basin

CLC Number: 

  • P512.2
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