对井间地震反射波成像资料的初步认识

Basic cognition to reflection imaging data from crosshole seismic.

1. 中国科学院广州地球化学研究所, 广东广州510640;2. 中国石油化工股份有限公司胜利油田分公司, 山东东营257022

Guangzhou geochemistry institute of CAS, Guangzhou 510640, China

井间地震在解决油藏开发问题方面具有明显的精度优势,为了更好地认识和应用井间地震资料,从不同角度对井间地震反射波成像资料进行了分析。通过对井间不同成像方法基本原理的分析,井间成像资料与合成地震记录的对比分析,地层与反射波组对应关系的分析,地层内部变化与地震反射结构的分析,以及井间成像资料与地面地震资料构造趋势的对比分析,得出井间成像资料可以更好地反映地下地质构造形态,同相轴反映的是地层波阻抗界面的认识。对垦71井区井间地震反射波深度域资料进行了波数计算,对其时间域资料进行了频谱分析,并进行了井间地震资料、地面地震资料、测井曲线等的标定对比,认为井间地震反射波成像资料能够分辨3～5m厚的薄层。对胜利广利油田的井间地震反射波成像资料进行了构造解释,结果表明井间地震反射波成像资料具有反映细微构造的能力。井间地震正演模型分析表明,选择大角度道集进行有限角度叠加处理的成像资料可以用于岩性解释。

The variation of layer wave impedance interfaces can be reflected in imaging section through a series of contrasting and analysis such as contrasting seismic reflection imaging data with synthetic seismogram, analyzing the corresponding relation of horizon and reflection wave, studying on the variation inside layers and seismic reflecting configuration, contrasting the structure trend from crosshole seismic image and routine seismic image.By computing wave number in depth domain, analyzing frequency spectrum in time domain and comparing calibration of various types of data in Ken 71 Well area, we conclud that crosshole seismic reflection imaging data has higher resolution, thin layer of 3-5m can be distinguished.Interpreting result in Guangli oilfield indicates that the crosshole seismic reflection imaging data is able to reflect fine structure.The forwardmodel proves that limited angular stack processed crosshole seismic data by selecting large angular gather can be used for lithologic interpretation.