Lithologic Reservoirs ›› 2025, Vol. 37 ›› Issue (2): 115-126.doi: 10.12108/yxyqc.20250211

• PETROLEUM EXPLORATION • Previous Articles    

Sedimentary characteristics of the shallow-water braided river delta of Jurassic Qigu Formation in Yongjin area, Junggar Basin

HU Xin1,2, ZHU Xiaomin1,2, JIN Xuling1,2, HUANG Cheng1,2, ZHOU Yue1,2, CHENG Changling3, XIU Jinlei3, REN Xincheng3   

  1. 1. China University of Petroleum(Beijing), National Laboratory of Oil and Gas Resources and Engineering, Beijing 102249, China;
    2. School of Earth Sciences, China University of Petroleum(Beijing), Beijing 102249, China;
    3. Research Institute of Exploration and Development, Shengli Oilfield, Sinopec, Dongying 257000, Shandong, China
  • Received:2024-06-11 Revised:2024-08-16 Published:2025-03-06

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Abstract: Based on seismic sedimentology theory，the core，logging and seismic data are comprehensively utilized to recover evolution history of Jurassic Qigu Formation in the Yongjin area of Junggar Basin，to quantitatively characterize the temporal and spatial distribution pattern of the thin-layered sands in the Qigu Formation，and construct sedimentary evolution models under different stratigraphic grids，by using the techniques of 90°phase-shift，attribute clustering，RGB attribute fusion，stratigraphic slicing，and waveform-indicating simulation. The results show that ：（1）Jurassic Qigu Formation in the Yongjin area of Junggar Basin developed shallow-water braided river delta front subfacies. During the lowstand tract system，the main channel of subaqueous diversion was developed at the front margin，the sand body of the river channel was wide and continuous，and the sedimentary sequence mostly showed intermittent positive rhythms without mudstone interlayers；during the lacustrine transgressive system tract，the secondary channel was developed at the front margin，the sand body of the river channel was narrow and intermittently distributed，and the sedimentary sequence mostly showed intermittent positive rhythms with mudstone interlayers.（2）The stratigraphy of the Qigu Formation in Yongjin area is spreading like a wedge from north to south，and the thickness of the sand body is between 32-48 m，with an average thickness of 35 m. During the period of the lowstand tract system，the sand body shows the development of composite sand body superposition，with a thick layer and good connectivity；during the period of the lacustrine transgressive system tract，the development of a single sand body is dominated，with a thin thickness and poor connectivity.（3）The planar spreading pattern of the river sand body in front of the shallow delta of the Qigu Formation in the Yongjin area is controlled by the paleomorphic pattern and the change of lake level rise and fall， to form two types of subaqueous diversionary river sand bodies，the front edge of the shallow braided river delta in the low level system domain is in the form of a branch，and in the lake intrusion system domain is in the form of a net spreading pattern.

Key words: seismic attribute, waveform-indicating simulation, stratigraphic slices, shallow braided river delta, paleogeomorphology, lake level rise and fall, Qigu Formation, Jurassic, Yongjin area, Junggar Basin

CLC Number: 

  • TE121
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