Lithologic Reservoirs ›› 2024, Vol. 36 ›› Issue (4): 85-97.doi: 10.12108/yxyqc.20240408

• PETROLEUM EXPLORATION • Previous Articles     Next Articles

Sedimentary characteristics of fan delta front of the fourth member of Cretaceous A’ershan Formation in Bayindulan Sag，Erlian Basin

ZHOU Hongfeng1, WU Haihong2, YANG Yuxi1, XIANG Hongying1, GAO Jihong2, HE Haowen2, ZHAO Xu2   

  1. 1. Erlian Branch, PetroChina Huabei Oilfield Company, Xilinhaote 027200, Inner Mongolia, China;
    2. Zhike Petroleum Technology Co., Ltd., Renqiu 062552, Hebei, China
  • Received:2023-05-12 Revised:2023-05-31 Online:2024-07-01 Published:2024-07-04

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Abstract: Based on core observation and particle size analysis，combined with mud-logging，wire-logging and seismic data，the sedimentary characteristics，distribution law and development model of fan delta front of the fourth member of Cretaceous A’ershan Formation（K1a4）in B51 well area of Bayindulan Sag in Erlian Basin were studied. The results show that：（1）The lithofacies of K1a4 in B51 well area can be divided into 13 types in four major categories：conglomerate，sandstone，siltstone and mudstone. The grain size distribution curves can be classified into four types，including one suspension segment pattern，low slope two segment pattern，high slope two segment pattern and one roll segment-one bouncing segment-one suspension segment pattern. The logging curves has the characteristics of box-shaped，bell-shaped，funnel-shaped，finger-shaped and flat-shaped， and there are four types of seismic facies ：foreset，lenticular，moundy and subparallel.（2）There are six types of sedimentary microfacies in the fan delta front，including underwater channel，underwater distributary channel，mouth bar，underwater distributary interchannel，sheet sand and distal bar. The K1a4 can be divided into Ⅰ， Ⅱ，Ⅲ sand groups in vertical. During the sedimentary period of Ⅱ and Ⅲ sand groups，the sand bodies of fan delta front were widely distributed，underwater channel and underwater distributary channel were mainly developed. During the sedimentary period of Ⅰ sand groups，lacustrine basin occupied the largest area，sand bodies became finer and thinner.（3）The K1a4 in the study area shows water intrusion depositional sequence from bottom to top，with the development of a retrogradational fan delta front. It is predicted that the underwater channel and underwater distributary channel developed in B51-71 and B51-74 well areas are favorable reservoir facies zones，while mouth bar developed in B51-19 well area is a more favorable reservoir facies zone.

Key words: fan delta front, sedimentary characteristics, transgressive-regressive cycle, grain size cumulative probability curve, logging facies markers, seismic facies, underwater distributary channel, mouth bar, the fourth member of A’ershan Formation, Cretaceous, Bayindulan Sag, Erlian Basin

CLC Number: 

  • TE121.3
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