基于三维地震剥层的重力界面反演方法及应用

doi:10.11720/wtyht.2019.1475

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Abstract

The quality of seismic data is poor and imaging is difficult in case of deep layers because of complex near-surface and underground geological structural conditions in western exploration area,and the structure attributes of deep strata are difficult to be identified only by seismic data due to the inherent non-unique problem and the low resolution problem.The gravity interface inversion method based on 3D seismic stripping was adopted in this study,with the addition of drilling-geological data constraints,which can carry out gravity field source separation by means of forward "stripping" under the seismic structural interface constraints,and then the method could carry out interface inversion for target gravity anomaly.The popular frequency domain Parker-Oldenburg iterative algorithm was adopted in the forward inversion stage,which guaranteed the fast and stable convergence of the inversion.The results show that the three-dimensional seismic peeling method can effectively peel off the high-frequency signals,achieve the accurate acquisition of the gravity anomaly caused by the geological target body and calibrate the deep interface accurately.Deep structural interface inversion was carried out in eastern Junggar basin,which proved the method is an effective method for studying deep geological targets.

Key words： gravity propecting deep structure three-dimensional seismic peeling interface inversion datum control Parker-Oldenburg method

Received: 27 December 2018 Published: 25 October 2019

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	Articles by authors
	Tao GUO
	Jia-Shan HU
	Ke-Min YIN
	Shu-Hua WANG
	Guo-Zhi FENG
	Hui-Zhen YU

Cite this article:

Tao GUO,Jia-Shan HU,Ke-Min YIN, et al. Gravity interface inversion method based on three-dimensional seismic peeling and its application[J]. Geophysical and Geochemical Exploration, 2019, 43(5): 1090-1096.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2019.1475 OR https://www.wutanyuhuatan.com/EN/Y2019/V43/I5/1090

Schematic diagram of variable density gravity topography and middle layer correction

Schematic diagram of velocity-density-depth fitting surface of sandstone in an area

Schematic diagram of a three-dimensional variable density model in an area

The division of tectonic units in Zhundong region

The 1:200000 bouguer gravity anomaly map of the Zhundong region

Gravity forward demonstration based on seismic-geological model
a—structural interpretation model based on seismic data;b—based on construction model

Comparison of gravity inversion and seismic interpretation
a—the top interface of carboniferous obtained by stripping gravity inversion;b—the top interface of carboniferous obtained by seismic interpretation

The Residual gravity anomaly map of 1:200000 stripped layers in Zhundong region

Buried depth prediction map of carboniferous top in Zhundong region

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