密点速度分析技术在塔河油田西南部低幅构造中的应用  

Application of high density velocity analysis to low relief structure in the southwest part of Tahe Oilfield

作　　者：叶勇[1] 孙开峰[2] 

机构地区：[1]中国地质大学,武汉430074 [2]中国石油化工股份有限公司石油勘探开发研究院南京石油物探研究所,南京210014

出　　处：《地球物理学进展》2008年第1期124-128,共5页Progress in Geophysics

摘　　要：随着地震勘探精度的不断提高,常规速度分析方法已不能满足精细构造分析、储层描述及各向异性研究等对速度精度的要求.研究应用高密度叠前速度求取技术,自动拾取地震记录规则波的走时、振幅、波场相干性及炮点射线参数、检波点射线参数等信息,求取不同偏移距道上波峰时间处的反射波速度,并针对地质条件,采用空变时变速度滤波、频率滤波、倾角参数滤波等手段提高速度精度.将该技术应用于塔河油田西南部TFT地区1200km2叠前三维地震资料的精细速度分析,落实了主要目的层低幅度构造,确定了构造形态和要素;通过差异速度分析、AVO反射能量包络差及速度变化规律研究,对泥盆系东河砂岩进行了储层异常区带划分.As the ever-increasing accuracy requirement for seismic survey, conventional velocity analysis methods have been shown failure in providing adequate accuracy of velocity for fine structural analysis, reservoir characterization, and anisotropic study. We adopted high density prestack velocity analysis technology to automatically pick the traveltime, amplitude, and coherency of the regular waves, as well as the ray parameters at shot and receiver to calculate the velocity of reflection at peaks for traces of different offset. To further improve the accuracy of velocity, measures such as spatially time-variant velocity filtering, frequency filtering, and dip filtering were used according to the geology. The method has been applied to calculate the detailed velocity on prestack 3-D data set from an area covering 1200km^2 in TFT, Tahe Oilfield. From which, low relief structures of main targets and its geometry and features are determined. Furthermore, the reservoir intervals are delineated by differential interformation velocity analysis, envelope difference of AVO energy, and velocity variability study in the Devonian sandstone of Donghe Formamation.

关 键 词：密点速度分析 炮点射线参数 检波点射线参数 差异速度 低幅度构造 

分 类 号：P631[天文地球—地质矿产勘探]