摘要
针对准噶尔盆地沙湾凹陷岩性目标勘探中面临的资料处理难点,结合GeoEast系统特色处理技术,建立了面向岩性目标精细识别的地震资料处理技术流程。首先,采用KL变换线性噪声衰减技术、近炮点强能量干扰压制技术和叠前相干噪声压制技术,实现了针对岩性目标的保幅噪声压制;其次,利用空变步长反褶积改善子波的空间一致性,在此基础上采用地表一致性反褶积技术最大限度提高了地震资料的分辨率,满足了岩性勘探需求;最后,组合应用高精度Radon变换多次波压制技术、叠后逆散射层间多次波预测及自适应匹配相减技术,实现了多次波逐级有效压制。实际资料处理表明,基于上述流程得到的地震成果品质大幅提升,二叠系内部地层接触关系清楚,对小断裂和薄砂体刻画清晰,有力支撑了沙湾凹陷的地层岩性油气勘探。
Due to the difficult data processing during lithologic target exploration in the Shawan Sag,Junggar Basin,a technical process of seismic data processing for fine lithologic target recognition is created with the characteristic processing technologies of the GeoEast system.Specifically,amplitude-preserving noise suppression for lithologic targets is achieved with the Karhunen-Loeve(KL)transform-based linear noise attenuation technology,the near-source high-energy interference suppression technology,and the prestack coherent noise suppression technology.In the aspect of resolution improvement,the spatial consistency of the wavelets is enhanced by variable spatial step deconvolution.On this basis,the surface-consistent deconvolution technology is employed to maximize the resolution of seismic data and thereby satisfy the needs of lithologic exploration.As for multiples,the multiple suppression technology based on high-precision Radon transform and the technology of internal multiple prediction based on post-stack inverse scattering and adaptive matching subtraction are combined to effectively suppress the multiples step by step.Actual data processing reveals that the quality of seismic results obtained in the above process is significantly better.The stratigraphic contact relationships in the Permian are clear,and small fractures and thin sand bodies are characterized distinctly.In this way,the technologies discussed strongly support the exploration of stratigraphic-lithologic oil and gas in the Shawan Sag.
作者
李晓峰
潘龙
张欣吉
林娟
马晶晶
张林红
LI Xiaofeng;PAN Long;ZHANG Xinji;LIN Juan;Ma Jingjing;ZHANG Linhong(Institute of Geophysics,Research Institute of Exploration and Development,Xinjiang Oilfield Company,PetroChina,Urumqi,Xinjiang 830013,China)
出处
《石油地球物理勘探》
EI
CSCD
北大核心
2022年第S01期29-36,7-8,共10页
Oil Geophysical Prospecting
关键词
岩性目标识别
保幅噪声压制
空变步长反褶积
高精度Radon变换
逆散射
lithologic target recognition
amplitude-preserving noise suppression
variable spatial step deconvolution
high-precision Radon transform
inverse scattering
作者简介
李晓峰,工程师,1989年生,2012年获中国石油大学(华东)地球物理专业学士学位,2015年获中国石油大学(华东)地球物理专业硕士学位,目前在新疆油田分公司勘探开发研究院地球物理研究所从事地震数据处理及物探方法研究。新疆维吾尔自治区乌鲁木齐市北京北路397号中石油新疆油田分公司勘探开发研究院地球物理研究所,830013。Email:li-xfeng@petrochina.com.cn
