叠前反演技术在南堡1号构造带火成岩识别中的应用  

Application of Pre-stack Inversion Technology in the Volcanic Rock Identification of Nanpu 1 Structure Area

作　　者：李聪[1] 赵宝银 徐文会[1] 霍丽丽 高娟 Li Cong;Zhao Baoyin;Xu Wenhui;Huo Lili;Gao Juan(Petro China Jidong Oilfield Company,Tangshan Hebei 063205,China)

机构地区：[1]中国石油天然气股份有限公司冀东油田分公司,河北唐山063205

出　　处：《工程地球物理学报》2022年第5期673-682,共10页Chinese Journal of Engineering Geophysics

基　　金：冀东油田公司油田重点项目(编号:KT2020B01)。

摘　　要：南堡1号构造浅层馆陶组岩性复杂,火成岩发育,钻井揭示该区火成岩以玄武岩和凝灰岩为主,在火成岩之间发育砂岩储层,受火成岩影响,砂岩储层横向分布规律性差。不同类型的火成岩具有不同的岩石物理特征及弹性参数特征。分析表明,玄武岩为高纵波阻抗,地震上表现为强振幅特征,利用地震资料能够有效识别;但是凝灰岩的纵波阻抗与碎屑岩接近,应用地震波形、振幅等信息以及纵波阻抗均难以识别,进行砂岩储层的预测存在误差,影响了钻探成功率及开发效果。为此,在针对馆四段不同岩性的面向储层的测井评价以及精细的岩石物理分析基础上,开展了馆四段不同岩性的敏感弹性参数分析,优选了不同岩性识别的敏感弹性参数;凝灰岩及泥岩表现为较高的纵横速度比,而砂岩储层为较低的纵横速度比。基于该认识,利用叠前稀疏脉冲同时反演对馆四段进行了反演处理,通过获得的纵波阻抗及纵横波速度比信息进行了火成岩及砂岩储层的识别及边界刻画,并获得了较好的预测效果,结果与地质认识基本相符,为后续井位部署和储量计算提供了依据。The Ng Formation of the Nanpu 1 structure has complex lithology and developed volcanic rocks.Drilling reveals that the volcanic rocks in this area are mainly basalt and tuff,and sandstone reservoirs are developed between the volcanic rocks.Affected by volcanic rocks,the lateral distribution regularity of sandstone reservoirs is poor.Different types of volcanic rocks have different petrophysical characteristics and different elastic parameters.The analysis shows that basalt has high p-impedance and strong amplitude,which can be effectively identified by seismic data.However,the p-impedance of tuff is close to that of sedimentary clastic rock,so it is difficult to distingguish between the seismic waveform,amplitude,other information and the P-wave impedance,and there are errors in sandstone reservoir prediction,which affects the success rate of drilling and development effect.Therefore,based on logging evaluation and fine petrophysical analysis,the sensitive elastic parameters of different lithologies of NgⅣare analyzed,and the sensitive elastic parameters of different lithology identification are optimized.Tuff and shale shows higher V/Vratio,while sandstone reservoir shows lower V/Vratio.Using pre-stack sparse pulse inversion processing,applying p-impedance and V/Vratio this paper interprets the boundary of the sandstone and volcanic,and produces a good prediction effect.The prediction results are consistent with geological understanding and provides the basis for subsequent well placement and reserves calculation.

关 键 词：叠前同时反演 岩石物理分析 火成岩 南堡1号构造 

分 类 号：P631.4[天文地球—地质矿产勘探]