水平井设计中地震资料的应用

APPLICATION OF SEISMIC DATA IN DESIGNING HORIZONTAL DRILLING

应用地震资料设计的水平井轨迹参数包括水平目的层段,靶点坐标(x,y,z),轨迹方位角(α),轨迹井斜角(θ),及水平轨迹曲线。设计水平井轨迹的两个关键是层位的正确标定和速度场的精细研究。本文以LHK三维地震资料为基础,通过对地震道的子波分析,提取出制作合成记录的子波参数,用高质量的合成记录完成特征层的正确标定;通过速度分析,总结小本区速度的变化规律。借助人机联作工作站编绘出高精度速度图和特征层精细构造图。通过水平1井钻井轨迹的设计,形成一套设计流程。钻探结果说明,这种方法是设计水平井的经济、高效、高精度的方法。

The trajctory parameters for horizontal drilling designed by use of seismic data include the horizontal target layer, segment the coordinates (x,y,z) of target points, the azimuthal angle (ot) and the dip angle (0) of the trajctory, and the horizontal trajctory curve. Two keys in designing the trajctory of horizontal drilling lie in the correct calibration for horizons, and the cautious study for velocity field. Based on the wavelet analysis on a set of 3-D seismic data in LHK area, the wavelet parameters for generating synthetic seismograms are extracted and the characteristic layers arc correctly calibrated with those high-quality syn-thetic scismograms. The features in velocity variation arc drawn from velocity analysis and a high precision velocity map and detailed structural map for the characteristic layer are plotted with the aid of an interactive workstation. The procedure for designing horizontal drilling is developed as a result of the work on the trajctory design of Well HD-1. Practice shows that this technique for horizontal drilling design is economic, effective and accurate.