摘要
四川盆地JY地区火山岩气藏具有良好的勘探前景。由于储层内部结构复杂、火山机构特征多样、岩性与岩相变化快等,在剖面上无法精细刻画火山岩体和火山机构。针对这一问题,首先根据实际数据建立火山岩模型,利用黏弹性介质波动方程逆时偏移成像分析了火山岩地层对地震波传播的屏蔽效应,找到火山岩地区地震资料成像关键点,再利用GeoEast处理系统搭建相应的宽频保真处理流程,重点采用低频保护去噪技术、低频补偿技术以及多信息约束深度域Q偏移技术,在提高有效信号低频端能量与信噪比的同时,将地震资料向高频端拓展。研究结果表明:①火山岩发育对地震波传播具有较强的屏蔽效应,低频信号对其穿透能力更强,对边界成像更有利,高频信号对火山岩内幕成像更有利;②通过保低频处理可以提高有效信号在低频端的能量与信噪比,改善成像效果;③Q偏移技术可以有效提高地震资料分辨率,为火山岩内幕以及火山通道的解释提供证据。与以前处理的地震资料相比,新处理的地震剖面火山岩包络面更清楚,内幕反射细节更丰富,顶、底反射界面更容易识别,为火山岩的精细刻画奠定了坚实基础。
Volcanic gas reservoirs in the JY area of the Sichuan Basin have a favorable prospect for exploration.However,due to the complex internal structures of the reservoirs,various characteristics of volcanic edifices,and rapid changes in lithology and lithofacies,it is impossible to accurately describe volcanic rocks and volcanic edifices on sections.Therefore,this paper builds a volcanic rock model according to actual data and employs the reverse-time migration method of the viscoelastic media wave equation to analyze the shielding effect of volcanic rock stratum on seismic wave propagation.The key points of seismic data imaging in the volcanic rock area are found,and then the GeoEast system is utilized to build the corresponding broadband fidelity processing procedure.Low-frequency protection and denoising technology,low-frequency compensation technology,and multi-information constrained depth domain Q migration technology are the focus for improving the energy and signal-to-noise ratio of effective signals at low-frequency ends and expanding the seismic data to high-frequency bands.The results are as follows.①Volcanic rock development exerts a strong shielding effect on seismic wave propagation.Low-frequency signals with stronger penetration ability are more favorable for boundary imaging,and highfrequency signals are more favorable for imaging inside volcanic rocks.②Low-frequency preserving processing can improve the energy and signal-to-noise ratio of effective signals at the low-frequency end,raising the imaging quality.③Q migration technology can effectively improve the resolution of seismic data and provide evidence for the interpretation of volcanic rocks and volcanic channels.The newly processed section has clearer volcanic rock envelopes,richer internal reflection details,and easier identification of top and bottom reflection interfaces,which has laid a solid foundation for the fine characterization of volcanic rocks.
作者
彭浩天
冉崎
陈康
张光荣
张福宏
何青林
PENG Haotian;RAN Qi;CHEN Kang;ZHANG Guangrong;ZHANG Fuhong;HE Qinglin(Research Institute of Petroleum Exploration and Development,Southwest Oil&Gas Field Company,PetroChina,Chengdu,Sichuan 610095,China;Oil and Gas Resources Division,Southwest Oil&Gas Field Company,PetroChina,Chengdu,Sichuan610051,China)
出处
《石油地球物理勘探》
EI
CSCD
北大核心
2022年第S01期6-15,共10页
Oil Geophysical Prospecting
基金
中国石油西南油气田公司重大科技专项“四川盆地二叠系火成岩成藏地质理论与勘探开发关键技术研究”子课题“四川盆地二叠系火成岩地球物理关键技术研究”(2019ZD01-03)资助
关键词
火山岩
逆时偏移
二次信噪分析
低频补偿
深度域Q偏移
volcanic rock
reverse-time migration
secondary signal-to-noise analysis
low-frequency compensation
depth domain Q migration
作者简介
彭浩天,1993年生,2015年毕业于西南石油大学,获勘查技术工程专业学士学位,2018年获西南石油大学地质资源与资质工程专业工学硕士学位,现就职于中国石油西南油气田公司勘探开发研究院,主要从事地震资料处理工作。四川省成都市高新区天府大道北段12号中国石油西南油气田公司勘探开发研究院,610095。Email:penghaotian@petrochina.com.cn
