约束层析反演在砂砾岩体速度建模中的应用

doi:10.13810/j.cnki.issn.1000-7210.2023.06.011

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Abstract Glutenite bodies widely exist in steep slope zones of faulting depression basins，and they can develop various hydrocarbon reservoir types with great exploration potential.However，due to their complex spatial distribution and overlap relationship，and large velocity differences with the surrounding rocks，it is difficult to employ the conventional grid tomographic modeling methods in the imaging domain to obtain their refined models.Thus，based on the grid tomographic inversion method in the imaging domain，this paper proposes a constrained tomographic inversion method in the imaging domain to improve the modeling accuracy of glutenite bodies.The thought of layer constraints is adopted，and the spatial distribution information of glutenite bodies obtained from seismic interpretation is combined to delineate key inversion regions.Meanwhile，it introduces the logarithmic barrier function and limits the velocity variation range of the glutenite bodies by applying inequality constraints to improve the modeling accuracy of the bodies.The application results in the BS work area indicate that compared with the original grid tomographic model，the velocity model built by this method is more consistent with the glutenite body distribution in the imaging section.Compared with the results of the fusion model，it can reveal the velocity changes inside the glutenite body，and the quality of its corresponding imaging section is also improved.

Key words： glutenite body tomography migration velocity modeling depth domain internal penalty function inequality constraint

Received: 12 April 2023

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P631

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	Articles by authors
	JIN Changkun
	QIN Ning
	GUAN Jian
	ZONG Zhaoyun
	LI Kun
	LIU Qunqiang

Cite this article:

JIN Changkun,QIN Ning,GUAN Jian等. Application of constrained tomographic inversion in seismic velocity modeling of glutenite bodies[J]. OGP, 2023, 58(6): 1392-1397.

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http://www.ogp-cn.com/EN/10.13810/j.cnki.issn.1000-7210.2023.06.011 OR http://www.ogp-cn.com/EN/Y2023/V58/I6/1392

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