基于目标性滤波器的倾角道集绕射体成像

doi:10.11720/wtyht.2020.1344

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Abstract

Accurate imaging of subsurface anomalous geological bodies with diffraction energy is one of the breakthrough technologies in seismic exploration in recent years.Stacking the dip gather after effective filtering is the main technical means to effectively utilize the seismic diffraction information.In this paper,the authors improved the calculation method of dip domain common image gathers in a more flexible and efficient way and,through model test,analyzed the differences and relations between reflected energy and diffracted energy in DDCIG(Dip Domain Common Image Gathers).Then,a new target dip filter was designed for dip domain common image gathers to achieve better diffraction information.The authors testified the new methods both on a model data and on actual production data of beaded reservoir in Northwest China which highly demands diffracted imaging.With achieving better diffraction energy, the authors finally succeeded in improving imaging for weak diffraction geological body with less calculation time.

Key words： dip domain common image gathers target dip filter diffraction energy beaded reservoir

Received: 08 July 2019 Published: 24 June 2020

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Shuang HAO. Seismic dip gathers imaging based on target dip filter for diffraction energy[J]. Geophysical and Geochemical Exploration, 2020, 44(3): 591-598.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2020.1344 OR https://www.wutanyuhuatan.com/EN/Y2020/V44/I3/591

Schematic diagram of seismic wave path

Geological model and offset results
a—tilted velocity model;b—diffraction velocity model;c—DDCIG of tilted model;d—DDCIG of diffraction model

Comparison of filtering and imaging results for TDF filter
a—unfiltered seismic model imaging section and corresponding DDCIG;b—conventional dip filter imaging and filtered DDCIG;c—TDF imaging and filtered DDCIG

Comparison between traditional method and TDF method for Tahe carbonate carbonate beaded reservoir
a—unfiltered seismic imaging section and corresponding DDCIG;b—conventional dip filter imaging and filtered DDCIG;c—TDF imaging and filtered DDCIG

Contrast of imaging sections in beaded reservoir
a—unfiltered seismic model imaging section;b—conventional dip filter imaging section;c—TDF imaging section

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