Lithologic Reservoirs ›› 2022, Vol. 34 ›› Issue (5): 121-129.doi: 10.12108/yxyqc.20220510

• PETROLEUM EXPLORATION • Previous Articles     Next Articles

Quantitative characterization of gravel roundness of sandy conglomerates of Triassic Baikouquan Formation in Mahu Sag

PENG Miao1, ZHANG Lei2, TAO Jinyu3, ZHAO Kang4, ZHANG Xianghui4, ZHANG Changmin4   

  1. 1. PetroChina Xinjiang Oilfield Company, Karamay 834000, Xinjiang, China;
    2. Research Institute of Exploration and Development, PetroChina Xinjiang Oilfield Company, Karamay 834000, Xinjiang, China;
    3. Wuxi Research Institute of Petroleum Geology, Research Institute of Petroleum Exploration & Production, Sinopec, Wuxi 214131, Jiangsu, China;
    4. School of Geosciences, Yangtze University, Wuhan 430100, China
  • Received:2021-05-20 Revised:2021-08-01 Online:2022-09-01 Published:2022-09-06

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Abstract: The gravel roundness characterization is important for facies analysis of sandy conglomerate strata. Based on the two parameters of gravel particle cross-sectional area and perimeter,the calculated roundness value was normalized to carry out quantitative characterization of roundness,so as to study the roundness characteris-tics of sandy conglomerates of Triassic Baikouquan Formation in Mahu Sag,and then analyze its sedimentary facies. The results show that:(1)The gravel roundness measurement process includes three steps:dividing the measurement unit,extracting the gravel image and calculating the morphological parameters,then the quantitative calculation of the de-flat roundness was completed,and finally the quantitative classification of the roundness was carried out.(2)The roundness of the gravel in the second coring of well Ma 15 is better than that in the third coring. The spherical and ellipsoidal gravel accounts for 19.89% and 38.98% respectively. The Rdn value of the second coring gravel shows a decreasing trend,and the roundness becomes worse as a whole,from subrounded to sub-angular and sub-rounded. The Rdn value of the third coring gravel gradually increases from the lower part to the upper part,and the roundness becomes better as a whole, from sub-angular to sub-angular and sub-rounded.(3)From the bottom to the top,the sedimentary facies of the second member of Baikouquan Formation of well Ma 15 transits from seasonal braided channel of delta plain to perennial braided channel of delta plain,corresponding to the change of gravel roundness from sub-angular to sub-angular and sub-rounded.

Key words: quantitative characterization, gravel roundness, de-flat roundness, Baikouquan Formation, Trias- sic, Mahu Sag

CLC Number: 

  • TE122.2+1
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