石油地球物理勘探2024，Vol.59Issue(3)：443-453,11.DOI:10.13810/j.cnki.issn.1000-7210.2024.03.007
四川盆地蓬莱气区近地表Q场求取及应用
Calculation and application of near-surface Q field in Penglai Gas Area,Sichuan Basin
摘要
Abstract
Near-surface absorption attenuation can seriously reduce the resolution of seismic data.Using micro logging data to estimate the near-surface absorption structure,obtain quality factor Q value of surface layer me-dium,and then perform inverse Q filtering compensation can achieve high fidelity and high resolution proces-sing.This paper proposed an improved spectral ratio method for obtaining Q values from micro logging data of a single well and then fitted the relationship between surface layer velocity and Q values to convert the near-sur-face velocity field into a near-surface Q field.Because the surface layer of the Sichuan Basin is thin,the depth sampling interval of the near-surface velocity field by tomographic inversion is 10 meters,which makes it diffi-cult to reflect the surface layer changes that are several meters.Therefore,combined with the multi-shot fitting algorithm for micro logging data of two wells,the equivalent Q value of the shallow surface layer was obtained.Then,the relative Q field of the surface layer was obtained using the amplitude and travel time information of the seismic data.In addition,the absolute Q value obtained from the micro logging data of two wellswas used to calibrate the relative Q field.Finally,the plane Q field of the surface layer was embedded in the shallow layer of the near-surface Q field converted according to the Q-V fitting relationship,and the optimized near-sur-face Q field of the work area was obtained and used for near-surface Q compensation of seismic data,so as to broaden the frequency band and improve the resolution of seismic data.关键词
近地表/品质因子Q/Q值估算/表层Q场/四川盆地Key words
near surface/quality factor Q/Q value estimation/near-surface Q field/Sichuan Basin分类
天文与地球科学引用本文复制引用
韩嵩,陈康,汤聪,王静,张茜,彭浩天..四川盆地蓬莱气区近地表Q场求取及应用[J].石油地球物理勘探,2024,59(3):443-453,11.基金项目
本项研究受中国石油西南油气田分公司勘探开发研究院项目"2022年度四川盆地物探技术攻关"(2022-N/G-62191)资助. （2022-N/G-62191）
