Lithologic Reservoirs ›› 2021, Vol. 33 ›› Issue (1): 186-197.doi: 10.12108/yxyqc.20210117

• PETROLEUM GEOLOGY • Previous Articles     Next Articles

Sedimentary characteristics and reservoir prediction of Xiagou Formation in Kulongshan structural belt,Qingxi Sag,Jiuquan Basin

ZHANG Wenting1, LONG Liwen1, XIAO Wenhua2, WEI Haoyuan2, LI Tiefeng2, DONG Zhenyu2   

  1. 1. PetroChina Research Institute of Petroleum Exploration and Development-Northwest, Lanzhou 730020, China;
    2. Research Institute of Exploration and Development, PetroChina Yumen Oilfield Company, Jiuquan 735000, Gansu, China
  • Received:2020-06-05 Revised:2020-09-10 Online:2021-02-01 Published:2021-01-25

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Abstract: The K1g1 and K1g0 of Lower Cretaceous Xiagou Formation are the main productive layers in Kulongshan structural belt of Qingxi Sag in Jiuquan Basin. In order to clarify the sedimentary characteristics and favorable reservoir distribution,high-resolution sequence stratigraphic division,provenance analysis and sedimentary microfacies distribution study were carried out by using core,logging,seismic and analysis data,and the reservoir characteristics and main controlling factors were expounded. The favorable reservoir distribution was predicted by using deep learning nonlinear inversion technology. The results show that:The K1g1 and K1g0 of Xiagou Formation in Kulongshan structural belt can be divided into four mid-term base level cycles(MSC1-MSC4)and eight short-term base level cycles(SSC1-SSC8)from bottom to top. The K1g1 and K1g0 of Xiagou Formation in Kulongshan structural belt are dominated by retrogradational fan delta,with three provenances in the west,south, and east. The fan deltas have a high degree of development in the middle and lower parts of K1g1 and K1g0,and have a wide distribution range. Fracture is an important factor to improve the physical properties of the reservoir. Together with secondary pores,it constitutes the main reservoir space,which can be divided into pore type reservoirs, pore-fracture type reservoirs and tight reservoirs. The deep learning nonlinear inversion technology was used to predict the favorable reservoir area of 14.7 km2. The research results can provide reference for Cretaceous oil and gas exploration in Kulongshan structural belt.

Key words: fan-delta, sedimentary facies, reservoir prediction, Xiagou Formation, Lower Cretaceous, Kulongshan structural belt, Jiuquan Basin

CLC Number: 

  • TE122.1
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