泌阳凹陷隐蔽油藏的地震勘探

泌阳凹陷在80年代后期开展了以隐蔽油藏为主要对象的深化勘探。由于该区隐蔽油藏的分布受不同构造区带地质条件的控制,具有明显的分带性;北部斜坡带以地层不整合为主(其中断鼻、断块构造油藏也较发育);中部深凹带以砂岩上倾尖灭及砂岩透镜体油藏为主;南部陡坡带则以差异压实所形成的小型构造油藏为主。所以,针对不同构造区带地质条件和油藏分布特征,采用了不同的地震勘探方法;用保护浅层反射的勘探方法勘探斜坡外带的地层不整合油藏;用三维地震方法勘探斜坡内带的断鼻、断块油藏;用高分辨率三维地震方法勘探凹陷中南部的岩性油藏和小型构造油藏。采用上述工作方法均获得了较好的勘探效果。

Seismic exploration of subtle reservoirs in the Biyang seg.

Detailed seismic exploration which mainly aims at subtle reservoirs in the Biyang seg has been done since late 1980's.Controlled by different geological conditions in different areas,the subtle reservoirs occur in obvious regional distribution.Unconformable reservoirs are mainly discovered in the north slope (there are less fault nose and fault block reservoirs),sandy updip pinch-out and sand lens reservoirs are mainly in deep mid seg,and small structural reservoirs created by differential compaction occur in steep south slope.Different seismic exploration methods are used in different areas which have their distinctive geological conditions and reservoir types respectively.The unconformable reservoirs in outside north slope can be discovered by using the seismic methods which protects shallow reflections, faulted nose and faulted block reservoirs in inside north slope by using three-dimensional seismic method, and stratigraphic and small structural reservoirs in mid-south seg by using high resolution three-dimensional seismic method.The above methods have brought quite good exploration results.