Lithologic Reservoirs ›› 2018, Vol. 30 ›› Issue (6): 89-97.doi: 10.12108/yxyqc.20180611

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Seismic identification of narrow and thin channel sandbodies of the second member of Guantao Formation in Matouying Uplift

ZHANG Jiankun1, WU Xin1, FANG Du1, WANG Fanglu1, GAO Wenzhong1, CHEN Xiaojun2   

  1. 1. Research Institute of Exploration and Development, Jidong Oilfield Company, PetroChina, Tangshan 063004, Hebei, China;
    2. Branch of Geological Research Institute, Shaanxi Coalbed Methane development and utilization Co., Ltd., Xi'an 710065, China
  • Received:2017-12-27 Revised:2018-03-20 Online:2018-11-16 Published:2018-11-16

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Abstract: Channel sandbody of the second member of Guantao Formation is narrow and thin in Matouying Uplift, which makes it difficult to identify on seismic section. A series of techniques were used, such as pre-stack time migration (PSTM), palaeogeomorphologic reconstruction, high-frequency isochronal stratigraphic division, wireline log facies analysis, channel sandbodies tracking with line drawings of seismic section, strata-bound wave impedance inversion and seismic amplitude strata slices etc. The result shows that the vertical resolution and spatial resolu-tion of seismic data are improved by reducing the grid bin from 15 m×30 m to 7.5 m×7.5 m in PSTM processing. Ng2 is characterized by the obvious "dual structure" of meandering channel, which display the thin interbedded layers of sandstone and mudstone. The sand bodies is controlled by short-term sedimentary cycle, and develop in the lower-middle part of short-term base-level rising hemi-cycles and upper part of short-term base-level descen-ding hemi-cycle. An analysis of seismic facies in Ng2 Ⅴ sand unit reveals that amplitude or wave impedance anomalies with channel forms, irregular arc shape show NE-SW and near NS distributed geomorphologic systems, indicating channel and point-bar complex depositions of meandering river system. The results manifest that the predicted results are consistent well with the actual drilling, and the channel distribution laws are in accordance with regional geological laws, demonstrating that seismic identification for thin channel sand body are true and reliable.

Key words: narrow and thin channel sandbodies, PSTM of seismic data processing with small grid bin, seismic facies analysis, Guantao Formation, Matouying Uplift

CLC Number: 

  • P631.4
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