A Method for Eliminating Caprock Thickness Influence on Anomaly Intensities in Geochemical Surface Survey for Hydrocarbons |
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| Authors: | Liuping Zhang Guoping Bai Yingquan Zhao |
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| Institution: | 1. Key Laboratory of Petroleum Resource, Institute of Geology and Geophysics, Chinese Academy of Science, Beijing, 100029, China
2. State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing, 102249, P.R. China
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| Abstract: | All petroliferous basins exhibit near-surface anomalous signals. The successful use of these signals must lead to great development in petroleum exploration. However, oil/gas fields cannot be effectively predicted in the case of intensive influence of caprock thickness on intensities of anomalies in a geochemical survey for hydrocarbons. In this paper, we first study the features of the influence of caprock thickness and then establish digital conceptual models for the influence in one and two dimensions. Finally, we develop techniques for eliminating this influence with wavelet analysis, based on the digital conceptual models. The newly developed techniques are applied to the actual data of acid-extractable hydrocarbons of soils in the southern slope of the Dongying Depression, East China where the anomaly intensities are considerably influenced by caprock thickness. The results illustrate that this new approach enables us to satisfactorily eliminate the influence of caprock thickness on anomaly intensities and thus can greatly improve the predictive capability of the existing geochemical data. |
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