Gravity and magnetic anomaly characteristics and oil & gas geological significance in the middle and northern part of the Huanghua Depression
Wu Xiao-yang1,3, Liu Tian-you1, Su Jun-qing2, Xiao Dun-qing2
1. Institute of Geophysics and Geomatics,China University of Geosciences,Wuhan City,Hubei Province 430074,China;
2. Exploration & Development Institute,Dagang Oilfield Branch Company of Petro China,Dagang District,Tianjin City 300280,China
Abstract：Based on gravity and magnetic anomaly data in the middle and northern part of the Huanghua Depression,in this paper local anomalies which are related to igneous rocks were extracted by using wavelet multi-scale analysis and power spectrum analysis methods.Based on gravity and magnetic local anomalies igneous structure in the south of Tangjia River and intrusive rock body in the east of 3-d seismic survey area were founded,by utilizing vertical second derivative to enhance local anomaly,the distribution location of the igneous rock is determined.By using gravity magnetic anomaly horizontal derivation,two large-scale S-N trending concealed deep faults were founded (Kongdian-Shenqingzhuang-Tianjin Fault and Huanghua-Banqiao Fault),it can be seen that there is a good corresponding relationship between the two faults and the igneous rock dense distribution area,they are the most important magma control structures in the middle and northern part of the Huanghua Depression.In addition,the horizontal first directional derivative of the aeromagnetic anomaly shows a NWW trending aeromagnetic anomaly gradient belt which extends eastwards from Tangu,Tianjin to Bohai Bay,it is believed that the aeromagnetic anomaly gradient belt is related to the basic igneous rocks.The effectiveness of utilizing wavelet multi-scale analysis and power spectrum analysis methods to extract aeromagnetic local anomaly was validated by the field data application effects.
吴小羊, 刘天佑, 苏俊青, 肖敦清. 黄骅拗陷中北部重磁异常特征及油气地质意义[J]. 石油地球物理勘探, 2010, 45(1): 140-145.
Wu Xiao-yang, Liu Tian-you, Su Jun-qing, Xiao Dun-qing. Gravity and magnetic anomaly characteristics and oil & gas geological significance in the middle and northern part of the Huanghua Depression. OGP, 2010, 45(1): 140-145.
