能量半衰时属性在浊积岩储层预测中的应用研究

浊积岩是济阳坳陷陆相断陷盆地典型的储集体,具有分布广、埋藏深、隐蔽性强等特点。经过多年的勘探研究和多种地震储层预测技术的应用,虽然对浊积岩储层的预测取得了一定进展,但仍然不能较好地满足勘探需求。针对渤南洼陷沙三段浊积砂岩与灰质泥岩交互发育的地质特征,通过不同韵律组合正演模型的模拟分析,论证了能量半衰时属性对层组韵律变化的敏感性。提出了能量半衰时属性分析预测方法并应用于研究区浊积砂岩储层预测,实现了含油砂组中灰质泥岩的有效剔除,划分了浊积水道的不同岩性组合类型与沉积亚相,预测了主力层系各砂层组的砂岩厚度、水道展布及有利储层发育区,大幅度提高了浊积砂岩储层预测的吻合率。

Turbidite is a typical reservoir in Jiyang depression as the continental downfaulted basin,which is characterized by wide distribution,deep burial depth and strong concealment,etc.After years of exploration and a variety of the application of seismic reservoir prediction technologies,the turbidite reservoir prediction has made some progress.However,it still can't meet the demand of exploration.Based on the actual geology of the Es3 turbidite sandstone and calcareous mudstone interactive development in Bonan sub-sag,through forward modeling analysis of the different rhythm combined layers model,the sensitivity of energy half-time attribute to the rhythm changes of layer set is demonstrated.On this basis,energy half-time attribute is proposed and applied to the turbidite sandstone reservoir prediction in the area.The calcareous mudstone in the oil sand groups are effectively eliminated and different lithology combination type and sedimentary subfacies in turbidite channel are divided.The sandstone thickness of every main sand formation,channel distribution and favorable reservoir development zone are predicted,and the turbidite sandstone reservoir prediction effect is greatly improved.