渤海湾盆地老爷庙地区火山岩速度建模与成像  

Velocity modeling and imaging of volcanic rocks in Laoyemiao area,Bohai Bay Basin

作　　者：石文武[1] 雍运动[2] 吴开龙[1] 田彦灿[2] 王鹏[2] SHI Wenwu;YONG Yundong;WU Kailong;TIAN Yancan;WANG Peng(Research Institute of Exploration and Development,PetroChina Jidong Oilfield Company,Tangshan 063000,Hebei,China;PetroChina Research Institute of Petroleum Exploration and Development-Northwest,Lanzhou 730020,China)

机构地区：[1]中国石油冀东油田分公司勘探开发研究院,河北唐山063000 [2]中国石油勘探开发研究院西北分院,兰州730020

出　　处：《岩性油气藏》2021年第4期101-110,共10页Lithologic Reservoirs

基　　金：国家科技重大专项“南堡凹陷油气富集规律与增储领域”(编号:2016ZX05006-006)资助。

摘　　要：渤海湾盆地老爷庙地区火山岩有较大勘探潜力,但在新近系馆陶组和古近系东营组广泛发育的多期次的火山岩对地震波具有强屏蔽作用,地震记录存在大量强反射和多次反射,而且火山岩岩层和下伏地层岩体形状极不规则、物性横向变化快,造成了地震能量的大量散射,制约了火山岩及下伏地层的准确成像,严重影响了该区的地震资料品质和油气精细勘探。采用“六分法”保真去噪技术结合五维规则化,提高了地震数据信噪比,为速度建模及深度偏移成像提供了宽频高信噪比道集;采用沿层层析结合三维网格层析速度建模技术,建立了深度域速度模型。结果显示:火山岩层间细节成像、中—深层断裂、断面成像都有了较大改善,井-震吻合程度较常规处理方法也有了明显的提升。该技术为该地区地震解释和储层预测奠定了基础。The volcanic rock reservoirs in Laoyemiao area of Bohai Bay Basin have great exploration potential.However,multi-stage volcanic rocks are widely developed in Neogene Guantao Formation and Paleogene Dongying Formation,which have strong shielding effect on seismic waves.There are a large number of strong and multiple reflections in seismic records.Moreover,the volcanic rocks and underlying strata have extremely irregular shapes and rapid changes in physical properties laterally,resulting in much seismic energy scattering,which restricts the accurate imaging of volcanic rocks and underlying strata,and seriously affects the quality of seismic data and fine oil and gas exploration in this area.The six-division signal-retained denoising technology and five-dimensional regularization technology were used together to improve the signal-to-noise ratio of seismic data and get broadband and high signal-to-noise ratio seismic gather for velocity modeling and depth migration imaging.Velocity model in depth domain was built by layer tomography combined with 3D grid tomography velocity modeling technology.The results show that the detailed imaging of volcanic rocks,middle-deep faults and cross-sectional imaging have been greatly improved,and the degree of well-seismic anastomosis has also been significantly improved compared with conventional processing methods.This technology has laid an important foundation for seismic interpretation and reservoir prediction in this area.

关 键 词：火山岩互层 散射 五维规则化 “六分法”去噪 网格层析 

分 类 号：P618.13[天文地球—矿床学]