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Author(s): |
Yunkui Yan, Department of Geology, Northwest University, Xi’an 710069/Yanchang Oilfield Company Limited, Yanchuan, Shaanxi 717208
Huifeng Li, School of Petroleum Resources, Xi'an Shiyou University, Xi’an 710065
Chunguan Zhang, School of Petroleum Resources, Xi'an Shiyou University, Xi’an 710066
Haiou Lu, School of Petroleum Resources, Xi'an Shiyou University, Xi’an 710067
Qing Chen, Department of Geology, Northwest University, Xi’an 710069 |
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Abstract: |
Yanchang block is located in the middle of Yanan single slope in eastern Shanbei slope, Ordos Basin. For researching the gas reservoir and gas-rich area in reservoir layers, 344km2 3D seismic exploration have been completed in this area in 2008,. In this paper, some fluid identification tests including seismic wave absorption coefficient study, seismic profile spectrum decomposition technique and seismic amplitude attenuation attribute have been made. The results of these tests indicate that, seismic amplitude attenuation is sensitive for gas-bearing reservoirs and absorption coefficient is also sensitive only for gas–rich layers. Some high probability distribution zones of gas-rich have been analyzed and predicted by using the maximum value of seismic amplitude attenuation and referencing absorption coefficient profile. Several exploration wells have been made at the zones for verifying predicted results and which have obtained a good effect in 2009.
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