井间地震资料精细解释方法研究与应用

On the interpretation method research and application of crosswell seismic data

井间地震资料分辨率很高,但是缺乏成熟的解释方法,本文针对井间地震资料的特点,借鉴地面地震解释技术对井间地震资料开展了精细解释方法研究.首先在深度域资料特点分析的基础上,利用区域速度和层析成像速度将深度域井间地震资料转换到时间域进行研究,并通过粗化降频建立起井间地震资料与地面地震资料之间的相似性联系,得到对井间地震低频反射特征的认识,结合井旁道合成地震记录标定建立起井间地震资料的反射特征,准确的解释了井间地震的反射层位.采用地震瞬时属性分析和时频属性分析得到了对沉积环境的认识,进一步通过波阻抗反演更好的认识井间储层特征.在实际应用中综合多种方法进行解释,并结合测井资料对比落实了井间砂体展布特征,得到对井间储层的精细描述结果,解决了两口井之间储层分布范围、横向连通性及厚度变化等问题,取得了较好的应用效果.

The fine interpretation methods for crosswell seismic data have been researched that are learned from the surface seismic technology to make full use of the high resolution abilitity. The characteristics have been analyzed in the depth domain, the spectrum analysis has been done in the time domain with the time-depth transform. The cross- well seismic data have been reset with a low pass filter and a spacing of surface seismic group interval and the similarity with the surface seismic data have been set up. According to the synthetic seismograms calibration, the crosswell seismic reflection characteristics can be confirmed, then the seismic interface can be interpreted in combination with the similarity. The seismic instantaneous attribute and time-frequency attribute have been used to analyze the sedimentary environment, and the impedance inversion have been adapted to get the distribution of sand-mud interbeded. With these methods and logging data contrast, the sand distribution between wells has been determined, the problem of connectivity and thickness variation between wells can be resolved and the better effect is obtained in application.