Lithologic Reservoirs ›› 2017, Vol. 29 ›› Issue (6): 101-107.doi: 10.3969/j.issn.1673-8926.2017.06.013

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Wide-frequency prospecting technology and its application on deep-seated Jurassic exploration in northern margin of Qaidam Basin

WANG Yongsheng1, HU Jie1, ZHANG Jing2, WANG Chuanwu2, ZHU Bo1, WU Yongguo3   

  1. 1. Department of Geophysical Exploration, PetroChina Qinghai Oilfield Company, Dunhuang 736202, Gansu, China;
    2. Research Institute of Exploration and Development, PetroChina Qinghai Oilfield Company, Dunhuang 736202, Gansu, China;
    3. Qinghai Geophysical Exploration Department, BGP Inc., CNPC, Dunhuang 736202, Gansu, China
  • Received:2017-07-05 Revised:2017-08-14 Online:2017-11-21 Published:2017-11-21

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Abstract: The targets are located in the deep Jurassic and basement in northern margin of Qaidam Basin. Under the influence of complex seismic geological conditions,the signal-to-noise ratio and resolution of seismic data are low, so it is difficult to implement favorable structural trap. Based on wide-frequency prospecting, a set of integrated seismic exploration technology of acquisition,processing and interpretation were carried out. The results show that deep imaging quality of the new acquisition seismic data is improved,and the reflection of Jurassic structure, fault and bedrock is clear, while the low frequency information is rich, effective bandwidth is broadened, and resolution is significantly improved. The integrated technology uses the low frequency vibroseis seismic excitation to enhance wave signal energy and broaden the original data bandwidth. High density wide azimuth observation ensures continuous, symmetric and uniform sampling of the wave field, and improves the signal-to-noise ratio. The precision of the complex structure imaging is improved by high precision chromatography first-break refraction static correction. The wide frequency inversion reservoir prediction accurately depicts the favorable sand body. The application results show that broadband seismic exploration technology can effectively solve the deep imaging problems in this area, and it is an effective technical support for oilfield exploration and development.

Key words: shale gas, accumulation conditions, Doushantuo Formation, Neoproterozoic, NW Hunan province

CLC Number: 

  • P631.4
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