黄河口凹陷渤中34—1复杂断块区构造特征及储层预测

Structural characteristics and reservoir prediction of Bozhong 34-1 complex fault-blocks zone in Huanghekou Sag

渤中34-1浅层复杂断块区处于郯庐走滑断裂带内,受其影响和控制该区断层较发育。根据新近系发育的断层走向,可将其划分为两套断层组合:NE向断层组合和NW向断层组合。其中NE向断层组合为走滑断裂右行扭动拉张分量作用下产生的一系列正断层,与长期活动的主断层形成“Y”字型组合,是油气运移的主要通道;NW向断层组合为走滑断层右行扭动应力作用下形成的一系列压扭性断层,具有较好的封堵性,有利于油气的聚集和保存。该区主要含油气层位明化镇组下段为厚层泥岩夹砂岩的浅水河控三角洲和曲流河沉积环境,砂岩储层在地震剖面上表现为强反射,依据振幅、能量等属性可较好地预测储层。由于该区域存在两种不同采集方式的三维地震区,为了消除单属性预测储层的不足,采用了多参数聚类分析的方法,获得了比较好的效果。

Bozhong 34-1 complex fault-blocks zone is located in Yanlu strike-slip fault zone.Affected and controlled by the strike-slip fault zone,faults are developed.Ac- cording to Ncocene faults throw,two fault-groups can be classified,NE fault-group and NW fault-group. Thereinto NE fault-group is a set of normal faults pro- ducing by stretch component of right strike-slip move- ment,and form“Y”font-style fault-group with long- period moving fault.The fault-group is primary path of hydrocarbon migration;while NW fault-group is a set of shear faults producing by right strike-slip movement. Fault scaling of the kind of faults is excellent and favora- ble to hydrocarbon accumulation and preservation.Main oil-bearing formation of this block lies in the lower mem- ber of Minghuazhen,which is argillite with interlaminated sandstone and belongs to shallow-water river-domina- ted delta and meandering river environmental deposits.As the sandstone reservoir has a strong reflection in seismic section,the seismic attributes such as amplitude,energy and etc can be used to predict the reservoir.Due to two different acquisition methods in the seismic block,the method of multi-parameters cluster analysis is adopted to eliminate the shortcomings of single seismic attribute in reservoir prediction and achieves good application.