A STUDY OF SMOOTHING FILTER OPERATOR FOR NORMALIZED FULL GRADIENT OF GRAVITY ANOMALY IN WAVE-NUMBER DOMAIN
ZHANG Feng-xu1, MENG Ling-shun1, ZHANG Feng-qin1, YANG Shu2, ZHAO Cheng-min3
1. Geo-Exploration Science and Technology Institute, Jilin University, Changchun 130026, China;
2. No.2 Geophysical Prospecting Party, Southwest Bureau of Petroleum, SINOPEC, Deyang 618000,China;
3. Hekou Production Plant of Shengli Oilfield Corp., SINOPEC, Dongying 257022, China
This paper has discussed the method of normalized full gradient of gravity anomaly in wave-number domain and suggested the introduction of smoothing filter operator in the process of downward continuation and derivation for potential field conversion. This technique helps increase the reliability and stability of calculation and extend the depth of continuation. Based on lots of model experiments and data analysis, the authors have determined the experiential value of exponential parameter about smoothing filter operator in calculating downward continuation and derivation, and pointed out the variational regularity between the depth of the geologic body and the harmonic number N: the lower (deeper) the depth of geologic body, the bigger (lesser) the value of N. It is also discovered that there exist similar characteristics of contour GH field between the three dimension model of symmetrical density anticline and asymmetric oil storage anticline and the two dimension model, and this offers the new thought for calculating the center of gravity and investigating the oil storage structure.
张凤旭,孟令顺,张凤琴,杨恕,赵承民. 波数域重力归一化总梯度法中的圆滑滤波因子[J]. 物探与化探, 2005, 29(3): 248-252.
ZHANG Feng-xu, MENG Ling-shun, ZHANG Feng-qin, YANG Shu, ZHAO Cheng-min. A STUDY OF SMOOTHING FILTER OPERATOR FOR NORMALIZED FULL GRADIENT OF GRAVITY ANOMALY IN WAVE-NUMBER DOMAIN. Geophysical and Geochemical Exploration, 2005, 29(3): 248-252.
[1] 别列兹金 В М.物探数据的总梯度解释法[M].陆克,刘文锦,焦恩富 译.北京:地质出版社,1994.
[2] 朱文孝,屠万生,刘天佑.重磁资料电算处理与解释方法[M].武汉:中国地质大学出版社,1989.
[3] 布赖姆 E O.快速傅立叶变换[M].柳群 译.上海:上海出版社,1979.
[4] 肖一鸣,张林祥.重力归一化总梯度法在寻找油气中的应用[J].石油地球物理勘探,1984,(3):247-254.
[5] 王家林,王一新,万明浩,等.用重力归一化总梯度法确定密度界面[J].石油地球物理勘探,1987,22(6):684-692.
[6] 吴文鹏,管志宁.三度体重力归一化总梯度的计算方法[J].物化探计算技术,1996,18(1):47-66.
[7] 曾华霖,李小孟,姚长利,等.改进的重力归一化总梯度法及其在胜利油区油气藏探测中的应用效果[J].石油勘探与开发,1999,26(6):1-6.
[8] Talwani M, Worzel J L,Landisman M M. Rapid gravity calculation for two-dimensional bodies with application to the fracture zone[J].Geophy Res, 1959, 64: 49-59.