塔河油田石炭系卡拉沙依组圈闭类型及预测方法

塔河油田石炭系卡拉沙依组是重要含油层系之一,卡拉沙依组砂层薄(3~8m)、横向变化快,表现为"一砂一藏、一井多藏"特征,且砂泥岩波阻抗差异小,储层响应特征被淹没,圈闭边界刻画困难。在垂向分辨率远不能满足预测需求的情况下,通过拓频及相移处理,应用地震沉积学思路充分挖掘平面属性的横向分辨率,融合多种不同属性来降低预测的多解性。同时将石炭系卡拉沙依组圈闭类型细分为构造—岩性型、河道岩性型、不整合面遮挡地层型,通过针对性开展不同类型圈闭的技术攻关研究,初步建立了相应的方法流程,为石炭系卡拉沙依组的精细勘探提供了技术支撑,取得了良好的应用效果。

The Trap Types of Carboniferous Kalashayi Formation in Tahe Oilfield and Its Prediction Methods

The Carboniferous Kalashayi formation of the Tahe oilfield is one of the important oil-bearing series.Kalashayi formation has the following characteristics:thin sand(3~8m),change drastically in lateral direction,"one sand with one reservoir,one well with multiple reservoirs".In addition,the difference of wave impedance of sand and shale is small;the response of reservoir is submerged and the boundary of the trap is difficult to describe.In the case that vertical resolution can't meet the needs of the forecast,multiple solutions of prediction are reduced by the combination of multiple attributes through the processing of extending frequency and shifting phase and the application of seismic sedimentology method to fully tap the lateral resolution property of the plane.At the same time,the Carboniferous Kalashayi formation is subdivided into three trap types:structure lithology,channel lithology and stratigraphic type on the unconformity surface.Through technical research on the development of different types of traps,the corresponding method is established,which provides technical support for the fine exploration of Carboniferous Kalshayi formation and obtains the good application.