用重力、地震资料联合反演直接预测油气藏的方法
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摘要
本文针对用高精度重力法直接预测油气藏技术存在的问题［2］，提出了一种用重力、地震资料联合反演直接预测油气藏的方法。该方法首先利用深度偏移地震剖面解释的地质构造信息为地质模型，进而用重力正演公式消除非目的层的密度界面对目的层的影响；然后，将目的层压缩成为一个等效密度界面，再用消除非目的层影响的剩余重力异常及演该界面的视界面密度差值；最后，根据目的层及演出的视界面密度差值的相对低值区来预测油气藏的位置。文中用鄯善油田的重力和地震资料，对该方法进行了验证，取得了较好的效果。
A method for direct hydrocarbon prediction using joint inversion of gravimetric and seismic data is presented to cope with the problems in direct hydrocarbon prediction by high-accuracy gravimetric data. The new method involves the following essential points: -The correct geologic structure obtained from depth-migration seismic section is taken as the initial geologic model.-Use forward formula to eliminate the influence of nonobjective density interfaces upon the objective layer.-Compress the objective layer into an equivalent density interface,whose pseudo interface density differences are then derived from the pure gravity anomaly of the objective layer.-Locate the possible hydrocarbon accumulation according to the low-value interval of the pseudo interface density differences.The method has been tested by using the gravimetric and seismic data from Shanshan oil field,producing quite good effect.
A method for direct hydrocarbon prediction using joint inversion of gravimetric and seismic data is presented to cope with the problems in direct hydrocarbon prediction by high-accuracy gravimetric data. The new method involves the following essential points: -The correct geologic structure obtained from depth-migration seismic section is taken as the initial geologic model.-Use forward formula to eliminate the influence of nonobjective density interfaces upon the objective layer.-Compress the objective layer into an equivalent density interface,whose pseudo interface density differences are then derived from the pure gravity anomaly of the objective layer.-Locate the possible hydrocarbon accumulation according to the low-value interval of the pseudo interface density differences.The method has been tested by using the gravimetric and seismic data from Shanshan oil field,producing quite good effect.
引文
1D奎奥等著,曾华霖译.重力勘探应用,石油工业出版社,1985
2王西文等.俄罗斯高精度重力法直接预测油气藏(GONG)技术的原理及应用效果分析.西安地质学院学报,1996,18(1):85～92
3王西文等.重力、地震联合反演在研究含油气盆地构造中的应用.石油地球物理勘探,1991,26(2):201～ 209,219
4王西文.快速位场反演的双次滤波技术.石油地球物理勘探,1993,28(6):705～713
2王西文等.俄罗斯高精度重力法直接预测油气藏(GONG)技术的原理及应用效果分析.西安地质学院学报,1996,18(1):85～92
3王西文等.重力、地震联合反演在研究含油气盆地构造中的应用.石油地球物理勘探,1991,26(2):201～ 209,219
4王西文.快速位场反演的双次滤波技术.石油地球物理勘探,1993,28(6):705～713
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