致密砂岩薄储层地震预测与水平井随钻应用

Seismic prediction of thin tight gas sand reservoir and its application in horizontal well geosteering

致密砂岩气是重要的非常规能源,与常规天然气相比,在勘探和开发阶段都有更大难度,地震预测的难度主要表现在储层致密和厚度薄两个方面。叠前地质统计学反演将地质信息与地震反演算法相结合,提供具有高垂向分辨率的储层预测结果,将该方法用于临兴区块盒8段砂体预测,指导水平井随钻。与叠前确定性反演成果相比,叠前地质统计学反演结果预测目标砂体展布变化的精度提高,与实钻结果吻合较好,能够有效指导工区水平井随钻工作。

As an important unconventional resource, tight gas is more difficult at the exploration and development stage than conventional gas. The difficulty lies in the high density and the thin reservoir sand. Prestack geostatistical inversion method combines geological information with seismic inversion algorithm and can provide high resolution result. To guide horizontal well drilling, this method is used to predict the sand reservoir distribution. Compared with deterministic inversion result, prestack geostatistical inversion can provide high accuracy prediction of target sand. This method is tested to be effective in horizontal well geosteering.