莫北地区油气成藏机理及成藏模式研究

The Study of Hydrocarbon Accumulation Mechanism and Accumulation Model in Mobei Area

通过油气成藏条件、成藏动力以及储层差异性等因素研究莫北地区油气成藏机理。莫北地区紧邻生油凹陷,油源条件优越,生储盖组合具有良好的时空配备;该地区断裂的封堵性较好,对油气的保存起到主控作用,应力集中部位储层得到改善,可形成规模较大的油气藏;该地区储层差异可造成不同断块之间油藏特征差异。研究其成藏模式发现,该地区烃源区为盆1井西凹陷,从西南方向注入,且为两期成藏,第一期为早白垩世,第二期为晚白垩世。

Hydrocarbon accumulation mechanism is studied under analysis of hydrocarbon accumulation conditions,driving force and reservoir divergences of Mobei area.The study conclusion shows that Mobei area is close to the petroleum generative depression,and there is advantageous oil-source condition and well space-time equipping of source-reservoir-cap assemblage.The sealing characteristics of Mobei fractures have a good performance that act a master control affection on oil-gas preservation which improve the reservoir in stress concentration place that form a large scale reservoir.Reservoir divergences cause reservoir characteristic divergences between different blocks.Through the research of reservoir forming model,it has been found that hydrocarbon source region is in the western depression of Pen 1 well and oil-gas filling direction of Mobei area comes from the southwest.Mobei area develops two stages of reservoir formation.The first stage is early cretaceous,and the second stage is late cretaceous.