摘要
三维典型数值模型和模拟对地震处理和解释方法研究具有重要意义,可以检验和测试各种新技术、新方法的有效性。中国西部双复杂探区长期存在地震偏移成像困难、构造难以落实的问题,急需建立代表中国前陆盆地双复杂特征的三维典型模型与正演模拟数据。文中以西部双复杂典型代表的克拉苏地区克深区块为例,综合西部前陆盆地山前带地表、地下典型地质和地球物理特点,充分利用地震深度偏移速度、声波测井、VSP测井、微测井等资料建立了中国西部双复杂典型数值模型(BGP-DC2GModels),包括声波速度模型、各向同性弹性介质模型、TTI/TORT模型、黏滞介质模型,具备复杂近地表、复杂地下构造、高速砾岩扇体、膏盐体、滑脱层(煤层)、Q异常体、各向异性等典型特征。基于该模型,利用谱元法模拟生成了各向同性声波、各向同性弹性波、各向同性黏弹性波、TTI黏弹性波、TORT黏弹性波等5套高质量地面与井中立体观测的正演模拟数据,并对比分析了不同数据的声波逆时偏移、各向异性偏移结果,进一步说明了典型模型和数值模拟数据能够测试和验证采集、处理、解释新方法的有效性。
The typical 3D numerical model and seismic simulation are of great significance for the study of seis-mic processing and interpretation methods,as they can test and validate the effectiveness of various new tech-nologies and approaches.In the double-complex exploration areas in western China,where both neasurface and subsurface structures present significant complex,there have long been challenges of difficult seismic migration imaging and delineation of structures,making it urgent to build a typical 3D model and forward modeling data that represent the double-complex characteristics of China’s foreland basins.By taking the representative double-complex area of the Keshen block in the Kelasu area in western China as an example,this paper com-bines the typical surface and subsurface geological and geophysical features of foothill areas in the western fore-land basins and fully utilizes data of seismic depth migration velocity,acoustic logging,VSP logging,and uphole survey to construct typical numerical models for double-complex exploration zones in western China(BGP-DC2GModels).The BGP-DC2GModels include an acoustic velocity model,an isotropic elastic medium model,TTI/TORT models,and a viscoelastic medium model,typically featuring complex near-surface conditions,com-plex subsurface structures,a high-speed conglomerate fan body,salt-gypsum formations,detachment layers(coal seams),a Q anomaly,and anisotropy.Based on the BGP-DC2GModels,five sets of high-quality forward modeling data for surface and borehole 3D observation are generated by adopting the spectral-element method,including the isotropic acoustic wave,isotropic elastic wave,isotropic viscoelastic wave,TTI viscoelastic wave,and TORT viscoelastic wave.Additionally,the acoustic reverse time migration and anisotropic reverse time migration results of the data are compared and analyzed,further demonstrating that typical models and nu-merical simulation data can test and validate the effectiveness of new acquisition,processing,and interpretation methods.
作者
李培明
于海生
武威
刘永雷
赵会兵
方勇
高蕊
LI Peiming;YU Haisheng;WU Wei;LIU Yonglei;ZHAO Huibing;FANG Yong;GAO Rui(BGP Inc.,CNPC,Zhuozhou,Hebei 072751,China;National Engineering Research Center of Oil&Gas Exploration Computer Software,Beijing 100088,China;Geophysical Research Institute,BGP Inc.,CNPC,Zhuozhou,Hebei 072751,China;Acquisition Technology Institute,BGP Inc.,CNPC,Zhuozhou,Hebei 072751,China)
出处
《石油地球物理勘探》
北大核心
2025年第4期937-950,共14页
Oil Geophysical Prospecting
基金
中国石油集团科技项目“多物理场高精度油气地球物理探测技术与装备研究”(2023ZZ05)
“地震处理解释关键新技术研究与智能化软件研发”(2021ZG03)联合资助。
关键词
典型模型
前陆盆地
正演模拟
双复杂探区
弹性介质
黏弹介质
各向异性
typical model
foreland basin
forward modeling
double-complex exploration area
elastic medium
viscoelastic medium
anisotropy
