塔河油田石炭系深层复杂碎屑岩油气潜力预测方法

Oil and Gas Potential Prediction Method of Complex Clastic Rocks in Deep Carboniferous Strata in Tahe Oilfield

塔河油田石炭系卡拉沙依组埋藏深、砂体厚度薄且纵横向变化剧烈,在砂体展布特征与砂体含油气性判别等方面存在地质认识和研究方法上的瓶颈,严重制约着该层系有利区带的评价。文章通过正态分布法、敏感参数交汇图法、Fisher法对测井资料进行二次解释,形成了流体识别标准与图版,并利用分频属性调谐效应与相控反演技术,实现薄砂体的有效识别,明确控藏断裂、构造、岩性是成藏控制的关键因素,以此确定了潜力区带优选原则,建立了石炭系储层油气潜力预测方法,使储层潜力预测有效率从45%提升至80%,可为超深薄砂层潜力评价提供技术参考。

The carboniferous karashayi formation in Tahe oilfield is deeply buried,with thin sand and drastic vertical and horizontal changes.There are bottlenecks of geological knowledge and research methods in the distribution characteristics and the discrimination of oil and gas properties of sand bodies,which seriously restrict the evaluation of favorable zones in this layer series.Through normal distribution method,sensitive parameter intersection graph method and the Fisher method provide a secondary interpretation of logging data,forming fluid identification standards and charts.By utilizing frequency division attribute tuning effects and phase controlled inversion techniques,effective identification of thin sand bodies is achieved.It is clear that controlling faults,structures and lithology are key factors for reservoir formation control.Based on this,the principle of optimum selecting potential zones is determined,and a method for predicting the oil and gas potential of carboniferous reservoirs is established.The efficiency of reservoir potential prediction has increased from 45%to 80%,providing technical reference for the potential evaluation of ultra deep and thin sand layers.