地震波形分类在春光探区沉积微相研究中的应用

Application of waveform classification in sedimentary microfacies of Chunguang exploratory area

针对春光探区中南部白垩系钻井资料少、沉积微相刻画困难等问题,结合岩心相、测井相的分析,在井震联合波形分类沉积微相标定的基础上,选用6种颜色代表6种波形,利用地震波形分类技术精细刻画春光探区中南部白垩系连木沁组的沉积微相平面展布特征。研究认为,连木沁组时期春光探区中南部发育扇三角洲–湖泊沉积体系,研究区Ch55、Ch118E和Ch120E井区分别发育三支扇三角洲前缘水下分流河道砂体,为有利的储集砂体发育区。

Aiming at the problem of little drilling data and difficulty in sedimentary facies describing of Cretaceous in south central of Chunguang exploratory area,combined with analysis of core facies and electrofacies,based on waveform classification sedimentary microfacies calibration through well seismic combination,6 colors were selected to represent 6 kinds of waveforms.By using the seismic waveform classification technique,the plane microfacies distribution characteristics of Lianmuqin formation of Cretaceous system were described accurately.It is believed that the fan delta-lacustrine sedimentary system developed in Lianmuqin formation of Chunguang exploration area in the central and southern part.In the Ch55,Ch118 E and Ch120 E well blocks of the study area,three subaqueous distributary channel sand bodies are developed in the leading edge of the fan delta respectively,which are favorable reservoir sand body development areas.