利用地震频谱比进行河道砂体预测

Application of Seismic Spectral Ratio Method to Predict Channel Sandbody

随着地震勘探处理技术的发展,充分利用与岩性、含油气性相关的地震信息进行储层砂体预测和含油性识别已成为提高油气勘探成功率的重要手段之一。然而在许多情况下,地质解释人员无法分清地震记录的变化是由地层、岩性,还是由外界条件引起的,地震频谱比技术充分利用了地震资料信息丰富的特点,细致刻画地震频谱的横向变化,能较好地消除地震记录上由激发和接收条件产生的噪音影响,从而突出岩性、油气的横向变化特征,以此可用于岩性识别和储层预测。以冀中饶阳凹陷大王庄油藏为例,介绍如何应用地震频谱比方法进行河道砂体和岩性油藏预测。依据预测结果提供2口钻探井位,经钻探实施均获工业油流,取得了明显的应用效果。

With the development of seismic exploration technique, sandbody prediction and oil-bearing identification related to seismic information of lithology and oil-gas-bearing features is becoming one of the important methods of enhancing success ratio in petroleum exploration. However, in many cases, geologist can't tell whether the changes of seismic records are caused by strata, lithology, or other external conditions. Seismic spectral ratio has made use of seismic information, depicted in detail the lateral changes of seismic spectral, and eliminated noise effects caused by the condition of shooting and receiver on seismic records, so as to protrude the lateral changes of seismic information with lithology and oil and gas. According to this, it can be used to predict the distribution area of lithology and sandbodies. In this paper, Dawangzhuang reservoir in Raoyang depression is taken as an example to show how seismic spectral ratio techniques are used to predict channel sandbody. Location of two wells has been provided based on the predicted results of this method. Drilling results confirmed both of the wells have a commercial production.