物探与化探2025，Vol.49Issue(2)：330-339,10.DOI:10.11720/wtyht.2025.1361
基于多参数融合的弱弹性介质激发井深设计方法
A multiparameter fusion methodology of well depth design for seismic excitation in weakly elastic media
摘要
Abstract
Due to numerous thin interbeds in weakly elastic media,seismic excitation typically yields rapidly attenuated seismic wave energy and a narrow dominant frequency band,resulting in low-resolution seismic data.Therefore,selecting a favorable lithology plays a crucial role in improving the seismic excitation effect.This study explored the dominant factors influencing the quality of seismic data obtained from the northern Jiangsu exploration area,a region with a dense river system.Specifically,this study determined the top boundary of the high-velocity layer based on microlog surveys and the dominant lithologic member using the cone penetration test and li-thologic coring.It quantitatively analyzed seismic wavelet attributes,including octave band,resolution,main-to-side lobe energy ratio,and wavelet clarity,establishing their matching relationship with the lithology for seismic excitation.By selecting a lithologic surface fea-turing a high seismic wave propagation velocity,a favorable elastic property,and a wide frequency band in the study area,it plotted a surface lithology map for pointwise well depth design,ensuring wide-frequency excitation.The above techniques were applied to well depth design for seismic excitation in the YA and SDX areas,achieving well-normalized single-shot frequencies and widening the domi-nant frequency band of the target layer in the seismic profile by over 10 Hz,with an increase of 1.5 octave bands.The results show that the excitation strategy of"selecting the dominant lithology from weakly elastic media"in regions with dense river systems can effectively enhance the seismic excitation effect in weakly elastic media,thereby improving the imaging accuracy and resolution of seismic data.关键词
水网地区/弱弹性介质/高分辨率/激发岩性Key words
a region with a dense river system/weakly elastic medium/high resolution/lithology for seismic excitation分类
天文与地球科学引用本文复制引用
包洪刚..基于多参数融合的弱弹性介质激发井深设计方法[J].物探与化探,2025,49(2):330-339,10.基金项目
中石化石油工程技术服务有限公司科研项目"江苏下扬子古潜山关键地震技术研究"(SG18-80X) （SG18-80X）
