高分辨率三维地震勘探隐蔽油气藏的效果

QK凹陷是黄骅拗陷的一个最大次级凹陷。QK凹陷西斜坡地区已有30多年的勘探历史。由于该区以往三维地震资料分辨率低，无法查清沙三段目的层内部的薄砂体分布规律，因此无法满足寻找隐蔽圈闭的需要。为此本文借助于层序地层学知识及高分辨率三维地震资料、三维约束地震反演资料，探索一种勘探隐蔽油气藏的新模式。高分辨率三维地震资料的主频由原先的25Hz提高到50～60Hz，经高分辨率处理后，浅层主频达到70Hz。沙三段目的层主频也达到40Hz以上。经测井约束地震反演后的地震剖面，可以清楚地显示沙三段内部的上倾尖灭砂体，为识别隐蔽圈闭创造了条件。

Effects using 3-D high-resolution seismic exploration for subtle reservoir

QK sag is one of biggest second-level sag in Huanghua depression. There have been more than 30 years of explored history on west slope of QK sag. It cannot verify the distributed regularity of internal thin sand bodies in Es3 target that cannot meet the need for finding subtle reservoir because of poor resolution of former 3-D seismic data in this area. For that reason, by the aid of sequence-stratigraphic knowledge and 3-D high-resolution seismic data as well as 3-D constraint seismic inversion data, the paper probed a new mode of exploration of subtle oil/gas reservoir. The dominant frequency of 3-D high-resolution seismic data has been increased from original 25 Hz to 50-60 Hz and even reached to 70 Hz for shallow layers after high-resolution processing. The dominant frequency in Es3 target can also be reached to above 40 Hz. The up-dip sandstone pinchout is clearly showed in internal Es3 target on seismic sections after logging-constraint seismic inversion, which created condition for identifying subtle traps.