半地堑式断陷盆地的油气成藏模式——以松辽盆地梨树断陷为例

THE MODEL FOR FORMATION RESERVOIR IN HALF GRABEN MODE OF FAULT-DEPRESSION BASIN——TAKING THE LISHU FAULT DEPRESSION IN SONGLIAO BASIN AS AN EXAMPLE

半地堑式断陷盆地是松辽盆地深部断陷的主要类型,是今后油气勘探重点。以梨树断陷为例,根据半地堑式断陷盆地的构造和层序地层发育特点,针对此类盆地的生储盖组合规律,总结出该类盆地中主要存在有滚动背斜油气藏、断层油气藏、超覆型上倾尖灭岩性油气藏、相变型上倾尖灭岩性油气藏、透镜型岩性油气藏、潜山油气藏等6种类型;探讨了半地堑式断陷盆地的油气成藏模式。

The half graben mode is a main type of depth fault depression of Songliao basin and it is the target for oil-gas exploration. Taking the Lishu fault depression as an example, according to the developed character of tectonics and sequence strata, and the cooperation regularity of sourcereservoircap six reservoir types were recognised. There are rollover anticline reservoir, fault reservoir, faultblock reservoir,updip pinchout lithology reservoir in overlap mode, updip pinchout lithology reservoir in phase transition mode, lenticular lithology reservoir and buried hill reservoir. The model for formation of reservoir in half graben mode faultdepression basin was discussed.