基于模式搜索的微地震速度反演——以渤海K油田为例

doi:10.11720/wtyht.2019.0139

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Abstract

Whether it is the cross-well seismic survey or hydraulic fracturing micro-seismic survey,all we need to know is the relatively accurate formation velocity.This paper presents a new method for micro-seismic layer velocity inversion.First,the logging data and geological knowledge are used to establish an initial velocity model,and then the first arrival time of the perforation record is picked up.Because the excitation time of some seismic records is difficult to be determined,the objective function is established by using the time difference between the seismic traces.Finally,the pattern search algorithm is used to find the optimal solution of the objective function.The model trial results and the application of actual data show that the method has better results for the layered media model with fewer parameters.The method provides some reference for the fracturing and other technologies in the Bohai Sea.

Key words： Bohai Sea micro-seismic pattern search traveltime difference velocity inversion

Received: 13 March 2019 Published: 25 October 2019

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	Articles by authors
	Hao YAN
	Bin LI
	Hai-Feng ZHAO
	He-Bing TANG

Cite this article:

Hao YAN,Bin LI,Hai-Feng ZHAO, et al. Pattern search algorithm for micro-seismic velocity inversion:A case study of K oilfield,Bohai Bay Basin[J]. Geophysical and Geochemical Exploration, 2019, 43(5): 1023-1029.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2019.0139 OR https://www.wutanyuhuatan.com/EN/Y2019/V43/I5/1023

Diagram of the pattern(N=2)
a—maximal basis pattern;b—minimal basis pattern

19]
a—initial pattern;b—move to north;c—move to east;d—move to north;e—contract pattern;f—move to east
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Diagram of the pattern search^[19]
a—initial pattern;b—move to north;c—move to east;d—move to north;e—contract pattern;f—move to east

Pattern search workflow

Theoretical model observation system

Travel time comparison between true values and inversion values
a—true value and original value;b—true value and 50^th iterative value;c—true value and 100^th iterative value;d—true value and 200^th iterative value

Iteration number and inversion values

Actual seismic data

Comparison between original well log(black) and inversion well log(red)

Travel time comparison between pick-up time and inversion time

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