Part-constrained 3D gravity inversion for the Hubabei buried hill in Raoyang Sag
Gu Wenbin1, Chen Qingli2, Wang Yuquan1, Li Xiaoyan1, Wu Yingquan1, Wang Jian1
1. Geophysical Exploration Research Institute, Huabei Oilfield Company, PetroChina, Renqiu, Hebei 062552, China;
2. Geophysics and Oil Resource Institute, Yangtze University, Wuhan, Hubei 430100, China
Abstract:Buried hills of the pre-Tertiary are important targets for oil and gas exploration.In order to recognize structural features of the Hubabei buried hills,large-scale gravity data is processed and inverted.First residual gravity anomaly is calculated by removing regional trend through the least squares method.Then a quadric surface is used as a trend.Residual gravity anomaly is transformed to the frequency domain from the spatial domain using two-dimensional Fourier transformation.A three-dimensional initial model is built based on seismic interpretation data of the pre-Tertiary top boundary,and the density data based on the logging data.Three-dimensional structure inversion is applied to the residual gravity data by Parker algorithm.A constrain grid is also created based on the quality of the seismic data to confine the inversion.The final model of the buried hill is obtained by the inversion.Result shows that the proposed 3D inversion is an effective method to recognize structural features of buried hills.
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Gu Wenbin, Chen Qingli, Wang Yuquan, Li Xiaoyan, Wu Yingquan, Wang Jian. Part-constrained 3D gravity inversion for the Hubabei buried hill in Raoyang Sag. OGP, 2016, 51(6): 1219-1226.
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