黄土塬地区双井微测井近地表Q模型的求取及应用

doi:10.11720/wtyht.2024.1227

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Abstract

Given the low resolution and poor wavelet coherence of seismic data for the loess tableland area of the Ordos Basin, this study proposed a method for calculating the near-surface Q-value model for near-surface Q-absorption compensation of seismic data. Investigations reveal that micrologs have been used to obtain the Q field of a whole survey area by calculating the Q value and subsequent interpolation. Based on previous research results, this study calculated the Q values of well sites and near-surface velocity values using dual-well micrologs. Then, the regional relationship function between near-surface velocity and Q was determined through fitting using the least squares method. Furthermore, the near-surface Q field of the study area was obtained using the near-surface velocity field derived from the tomographic inversion of the first arrival wave post basic static correction. Consequently, the near-surface Q field of the whole survey area were calculated from the Q values of microlog positions, and the near-surface Q absorption compensation of prestack gathers was achieved. As indicated by the application of the study area’s seismic data, which are characterized by complex surface and subsurface conditions, the inversion of the Q field for near-surface Q absorption compensation using the method proposed in this study can effectively enhance the wavelet coherence of seismic data, broaden the frequency band, improve the log-seismic matching relationship, and eliminate the influence of near surface on seismic wavelets.

Key words： loess tableland dual-well microlog Q-absorption compensation wavelet coherence

Received: 22 May 2023 Published: 27 June 2024

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	Articles by authors
	Chang-Liang XIA
	Hai-Tao DAI
	Guo-Qiang LI
	Fa-Ming GU
	De-Ming WU
	Li HAN

Cite this article:

Chang-Liang XIA,Hai-Tao DAI,Guo-Qiang LI, et al. The calculation and application of a near-surface Q-value model based on dual-well micrologs for a loess tableland area[J]. Geophysical and Geochemical Exploration, 2024, 48(3): 698-704.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2024.1227 OR https://www.wutanyuhuatan.com/EN/Y2024/V48/I3/698

Acquisition method of dual well micrologging

Interval Q and velocity inversed from W well

First break tomographic velocity model of Inline20 of swath L

Shallow layer Q model of Inline20 of swath L

Stack before (a) and after (b) of shallow layer Q compensation of Inline20 of swath L

Frequency spectrum of stacks of shallow layer Q compensation of Inline20 of swath L

Shot gathers before (a) and after (b) of shallow layer Q compensation of Inline20 of swath L

Autocorrelation of shot gathers before (a) and after (b) of shallow layer Q compensation of Inline20 of swath L

Process flow of processingof seismic data

Well seismic calibrationsof different seismic data processing flow

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