石油地球物理勘探2024，Vol.59Issue(4)：800-810,11.DOI:10.13810/j.cnki.issn.1000-7210.2024.04.017
火山岩发育区地震成像技术探讨
Seismic imaging technology in volcanic rock areas
摘要
Abstract
With the continuous improvement of oil and gas exploration,some oil and gas fields with volcanic rocks and volcaniclastic rocks as reservoirs have been discovered.However,due to the significant shielding ef-fect of volcanic rocks on seismic signals,the significant velocity variations of seismic waves in different layers and types of volcanic rocks,velocity modeling and imaging in volcanic rock development areas are extremely dif-ficult.The EP region is located in the Yangjiang-Yitong Fault Zone,with great resource potential and a large number of structural traps.Meanwhile,the Paleogene and its overlying strata have developed multiple periods and layers of volcanic rocks.Due to unclear imaging of the volcanic rocks and their underlying strata,it is diffi-cult to give a good definition of volcanic facies and to accurately evaluate the impact of volcanic rocks on the con-ditions of hydrocarbon generation,storage,and capping.This paper explores some new methods and new tech-nology attempted for key issues such as multiple wave suppression,weak signal recovery under volcanic rocks,and precise velocity modeling of volcanic rocks.Firstly,MWD(Model based Water-layer related Demultiple)technology is used to predict volcanic multiples.Then,AVO residual amplitude compensation and low-fre-quency operator extrapolation random noise attenuation techniques are used to improve the quality of weak sig-nals under volcanic rocks.Finally,first break tomography and grid-based tomography are used for accurate PSDM(Prestack Deep Migration)velocity modeling.The reprocessed PSDM results demonstrate substantial improvement in imaging of volcanic rocks and their underlying strata,indicating that the reprocessing techno-logy scheme can be a good reference for seismic imaging in volcanic rock areas.关键词
火山岩/多次波/SRME/MWD/初至波层析反演/网格层析反演Key words
volcanic rocks/multiple waves/SRME/MWD/first break tomography/grid-based tomography分类
天文与地球科学引用本文复制引用
张卫卫,袁全社,徐乐意,张治忠,郭佳,郭建卿..火山岩发育区地震成像技术探讨[J].石油地球物理勘探,2024,59(4):800-810,11.基金项目
本项研究受中国海洋石油集团有限公司"十四·五"重大科技项目"陆缘裂谷盆地深层/超深层油气成藏条件与成藏机制研究——珠江口盆地珠—坳陷"(KJGG2022_0403)资助. （KJGG2022_0403）
