S变换方法在薄储层描述中的应用

Application of S transformation method in thin reservoir description

针对薄储层边界识别精准度不高,储层含油性预测吻合度较低的现状,引入了S变换方法.S变换可将短时窗傅里叶变换和小波变换的优势组合,对地震信号采取频率自适应采样的方法,得到的单频信息更加准确,能够更有效地解决薄储层描述中存在的问题.利用S变换分频及吸收衰减属性对草桥油田沙三段主力含油薄储层砂体进行描述.结果表明,该方法能够较准确地确定主力砂体的超覆边界,对含油性给出了高效预测,结合实钻井开展地质综合评价,取得了良好的滚动勘探开发效果.

Aiming at the current situation that the the boundary identification precision of thin reservoir is not high and the anastomosis degree of reservoir oiliness prediction is lower,the S transformation method was introduced.The S transformation could combine the advantages of short-time window Fourier transform and wavelet transform,and the adaptive sampling method was adopted for the seismic signals.The obtained single frequency information is more accurate,which could solve the problems existing in the thin reservoir description more effectively.The main ES3 thin oil reservoir sand body in Caoqiao oilfield was described with the S transformation frequency decomposition and absorption attenuation nature.The results show that the proposed method can accurately determine the main overlap boundary of sand body,provide an efficient prediction of oiliness,develop the comprehensive evaluation through combining with the real drilling,and obtain good effect of rolling exploration and development.