济阳坳陷北部地区结晶基底研究

Study on crystal basement of north part of Jiyang De-pression

为了详细描述济阳坳陷北部结晶基底的构造形态,开展了重力场源分离、重震统计推断建模反演的应用性研究。基于场论,利用独立变量的数学特性,把密度仅当作地质模型参数,解决了因缺乏地层及密度测试资料而难以理论建模的矛盾;利用重震之间的对应关系,按重震特征点、区域控制点、模型伪样品点建模,应用该方法进行反演并编绘了重震统计推断济阳坳陷北部结晶基底构造图,在沾化一车镇地区的潜山油气勘探中,辅助地震发现了车古25西、邵54东等潜山目标。该方法为重震联合反演技术的发展开拓了简捷的建模新途径。

In order to describe structural shape of crystal base-ment at north part of Jiyang Depression in detail,the application modeling inversion by the separation of gravity field-source,gravity-seismic statistic infer-ence was researched.Based on field theory,this study solved the contradiction of being hard to theoretical modeling for the lack of testing data about formation and density through taking density as geological model parameter according to the mathematical features of in-dependent variables.Model was built according to the corresponding gravity-seismic relationship,gravity-seismic characteristic points,regional controlling points and pseudo-sample points of the model.Structural map of the crystal basement at north part of Jiyang De-pression by gravity-seismic statistic inference has been drawn with this method through inversion.In oil-gas exploration of buried hills in Zhanhua-Chezhen area,the buried hill target of western Chegu 25 and eastern Shao 54 was found out by assisting seism.This method has opened a concise and new approach for development of gravity-seismic joint inversion.