Lithologic Reservoirs ›› 2017, Vol. 29 ›› Issue (3): 10-17.doi: 10.3969/j.issn.1673-8926.2017.03.002

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A new quantitative method of sedimentary facies mapping of large lacustrine depression: a case from Chang 7 reservoir in central Ordos Basin

LIN Senhu, WANG Mengshi, YUAN Xuanjun   

  1. PetroChina Research Institute of Petroleum Exploration & Development, Beijing 100083, China
  • Received:2016-05-03 Revised:2016-06-27 Online:2017-05-21 Published:2017-05-21

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Abstract: In order to meet the needs of unconventional hydrocarbon exploration nowadays and improve the accuracy and efficiency of sedimentary facies mapping,the lithofacies classification,facies distribution,lithology combination proportion and sedimentary environment evolution of Triassic Chang 7 reservoir in Ordos Basin were analyzed. There are ten types of lithology recognized from the sieve residue log plot. Five of them are dominated,including fine sandstone,argillaceous siltstone,silty mudstone,mudstone and shale,of which the thickness is about 97% of the strata. Based on core observation and statistical analysis,the thickness composition of each microfacies with the five types of lithology was established,which can be used to implement quantitative sedimentary facies mapping. By overlapping the thickness percentage isoline maps of the five types of lithology in Chang 7 reservoir,various microfacies can be intensively identified,including delta plain distributary channel,delta front subaqueous distributary channel,subaqueous distributary channel,distal bar,mouth bar,prodelta, debris flow, turbidite, semi-deep to deep lacustrine.

CLC Number: 

  • TE121.3
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