利用地震频谱比进行河道砂体预测

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,细致刻画了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声影响,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.文中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的预测.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. 

APPLICATION OF SEISMIC FREQUENCY SPECTRAL RATIO TO THE PREDICTION OF CHANNEL SANDBODIES

With the development of seismic prospecting and processing technologies, using the seismic information correlated to lithology and oil potential to predict reservoir sandbodies and distinguish oil postential has become one of the important means to increase success ratio of petroleum exploration. But in many cases, geologists can't distinguish the changes of seismic records being resulted from stratigraphy, lithology, or from outside conditions. The seismic frequency spectral ratio technology makes full use of the features that seismic data include rich information. It carefully depicts the transverse variation of seismic frequency spectrum, and can better eliminate the noise influences in seismic records resulted from exciting and receiving conditions so as to project the transverse changing characteristics of lithology and hydrocarbon. It can be applied to distinguish lithology and predict reservoirs. In this paper, the Dawangzhuang oil pool in the Raoyang Say of Central Hebei Province was taken as an example to introduce the prediction of channel sandbodies and lithologic reservoirs by means of the seismic frequency spectral ratio method. Two drilling well sites were determined according to predicted results, and industrial oil flow was obtained by drilling practice.