L油田1N区块气云区内潜在断层地质识别方法探讨

Discussion of Potential Fault Geological Identification Methods in Gas Cloud Area of L Oilfield 1N Area

渤海海域L油田是存在气云区的典型油田,气云区占其圈闭面积的30%左右,气云区范围内地震资料品质较低,在地震剖面上整体表现为弱振幅、弱连续性的特点,断层解释的难度大。为进一步认识油田气云区内1N区块的断层分布,提高区块的开发效果,该文通过分析1N区块潜在断层的地质油藏响应,利用精细地层对比、注采井相关性分析等手段识别出了气云区内两条潜在断层的位置和延伸方向,降低了该区块地质不确定性,有效指导油田完善注采井网,确保注水安全。

There is a typical gas cloud area in the L Oilfield of Bohai Bay,and the gas cloud area accounts for about 30%of the trap area.The quality of seismic data in gas cloud area is poor,which is characterized by weak amplitude and weak continuity on the seismic profile.Consequently,it is difficult to interpret the faults in the gas cloud area.In order to further understand the fault distribution of 1N block and improve the development effect,we have studied the geological reservoir response of the potential faults in the gas cloud area of 1N area,and identified the position and extension direction of two possible faults by fine stratigraphic contrast and the correlation analysis of injection and production wells,thus reducing the geological uncertainty,improving well pattern and ensuring injection safety.