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在某些已经完成三维地震勘探工作的油气田区,因深层地震资料不好,深层构造难以得到解决。虽然结合地震资料与重力资料的重力剥皮技术得到开发和使用,但由于它没有考虑地层密度的横向变化,因此未能获得满意的处理效果。为了改善该类地区的重力勘探效果,本文提出了变密度剥层方法,它利用各地层的三维地震深度资料和三维地震层速度转换的具横向变化的密度资料,通过正演其重力效应,并从布格重力异常中去除,从而得到主要反映深部地质构造信息的变密度剥层重力异常。在北非某区块,除基底顶面外,各层地震资料良好,通过重力-地震联合变密度剥层处理得到的剥层重力异常,与已知地震和钻井资料吻合良好,为深部基底研究奠定了良好的基础。
In some oil and gas fields where some 3D seismic surveys have been completed, deep structures can not be solved because of poor seismic data. Although the gravitational stripping technology combining seismic data with gravity data has been developed and used, satisfactory processing results have not been obtained because it does not consider lateral changes in formation density. In order to improve the gravity exploration effect in this area, this paper presents a method of variable density delamination. By using the three-dimensional seismic depth data of various strata and the transversely-varying density data converted by the velocity of three-dimensional seismic layers, From the Bouguer gravity anomaly, we can get the gravitational anomalies of denuded delamination mainly reflecting the information of deep geological structure. In a certain block of North Africa, apart from the top of the basement, the seismic data of each layer are good, and the gravity anomalies of the stripping layer obtained by gravity-seismic combined densification and delamination treatment are in good agreement with known seismic and drilling data, laying a foundation for deep basement research A good foundation.