Lithologic Reservoirs ›› 2014, Vol. 26 ›› Issue (6): 57-63.doi: 10.3969/j.issn.1673-8926.2014.06.010

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Study on sedimentary facies of the third member of Shahejie Formation in Lin 7 fault block, Huimin Sag

LUO Wei1， HE Youbin2， MA Bo3
  

  1.  1. Research Institute of Petroleum Prospecting and Development ， Sinopec East China Subsidiary Company ， Nanjing 210011 ， China ； 2. School of Geoscience ， Yangtze University ， Wuhan 430100 ， China ； 3. Headquarters of Unconventional Oil and Gas Resources Prospecting and Development ，
    Sinopec East China Subsidiary Company ， Nanjing 210011 ， China
  • Online:2014-11-20 Published:2014-11-20

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Abstract:

Based on core observation, combining with data of regional geology, analysis assay and well logging, this paper systematically studied the sedimentary facies of the third member of Shahejie Formation （ Es 3 ） in Lin 7 fault block of Huimin Sag. It is considered that the study area developed delta, turbidite fan and lacustrine facies. The delta can be further divided into microfacies of underwater distributary channel, interdistributay bay, mouth bar, distal bar and prodelta mud, the turbidite fan can be further divided into microfacies of channel, interchannel, lateral frontchannel, margin channel and outer fan mud, and the lacustrine facies mainly developed semi-deep to deep lake mud. In the plan, the sediment in Es 3 spreaded along WN-ES direction. In vertical profile, the delta deposite mainly developed in lower Es 3 , the turbidite fan and the semi-deep to deep lacustrine mainly developed in middle and upper Es 3 . From lower Es3 to upper Es 3 , sand body experienced progradation to retrogradation repeatedly, and moved from west to east gradually, and the water is deepening gradually on the whole, including some short decreasing. This study of sedimentary microfacies provides geological basis for the comprehensive reservoir research of Es 3 in Lin 7 fault block.

Key words:  flowunit , modified stratigraphic Lorenz plot , flowzone indicator , integrated index of reservoir hetero-geneity , pore throat aperture

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