A new method of spectrum difference hydrocarbon detection and its application to the Dongsheng gas field
Dong-Hui WANG1(), Xiao-Chuan WU2
1. SINOPEC North China Company,Exploration and Development Research Institute,Zhengzhou 450006,China 2. CAS Key Laboratory of Ocean and Marginal Sea Geology,South China Sea Institute of Oceanology,Chinese Academy of Sciences,Guangzhou 510301,China
The crucial precondition of using spectral attributes to conduct hydrocarbon detection is to investigate the spectral differences between gas-bearing and none-gas bearing area.In order to determine the spectrum difference between hydrocarbon bearing and none-hydrocarbon bearing areas intuitively and incorporate the constraints of oil and gas production testing data,this paper proposes a hydrocarbon detection technology based on spectrum difference,which divides known wells into hydrocarbon-bearing wells and non-hydrocarbon bearing wells according to the actual oil and gas production testing data and research needs.By comparing the instantaneous amplitude spectral of pay zones of classified objects,researchers can recognize spectral differences related to hydrocarbons and use the intersection of multiple spectrum attributes to characterize the differences so as to obtain the seismic hydrocarbon-bearing areas that could be identified.The maximum trough amplitude was determined as the relative advantage attribute to recognize the reservoir information of the H1 member according to the forward modeling contrast between presence and absence of underlying coal seams.More in-depth analysis shows that the spectrum difference can better forecast hydrocarbon-bearing and hydrocarbon-absent zones than the maximum trough amplitude.The differences of spectral attributes between hydrocarbon-bearing areas and non-hydrocarbon bearing areas was quantified by setting attributed threshold value,and the spectral attributes in individual thresholds of the four spectral attributes were crossplotted to dentify the potential hydrocarbon bearing areas.The hydrocarbon dictation results are supported by horizontal wells,which indicates the method is reliable.
王东辉, 吴晓川. 频谱差异烃类检测新方法在东胜气田的应用[J]. 物探与化探, 2020, 44(4): 709-718.
Dong-Hui WANG, Xiao-Chuan WU. A new method of spectrum difference hydrocarbon detection and its application to the Dongsheng gas field. Geophysical and Geochemical Exploration, 2020, 44(4): 709-718.
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