准噶尔盆地侏罗系岩性油气藏成藏条件及控制因素

目前,准噶尔盆地面临勘探目标的转型,岩性油气藏勘探已成必然。为了更好地开展岩性油气藏勘探,以侏罗系为例,探讨了准噶尔盆地侏罗系岩性油气藏的成藏条件及控制因素。研究表明,准噶尔盆地侏罗系岩性油气藏具有优越的成藏条件:油源充足、储集性能较好、生储盖组合良好、运聚系统良好;其成藏模式为“远源不整合断裂控油气成藏模式”和“源内不整合断控油气成藏模式”;其油气藏的控制因素为古隆起控制着油气的分布、油源断裂和不整合控制着油气的运聚、储层质量控制着岩性油气藏的分布规模、储盖组合控制着岩性油气藏的纵向分布、坡折带控制着岩性油气藏的形成。

Study on petroleum accumulation elements of Jurassic lithologic reservoir and its controlling factors in Junggar basin

At present,the Junggar basin meets with the trans- formation of exploration target and the lithologic reservoir exploration becomes an inevitable trend.In order to carry out the lithologic reservoir exploration perfectly,the pe- troleum accumulation elements of Jurassic lithologic reser- voir and its controlling factors have been discussed.The results show that favorable petroleum accumulation ele- ments are the followings:abundant hydrocarbon source, good storage performance,effective source-reservoir- seal assemblage and great migration and accumulation sys- tem.Two kinds of petroleum accumulation patterns have been summarized,the first is unconformity and faults con- trolled reservoir with far source,and the second is the un- conformity and faults controlled reservoir within source. The controlling factors can be listed as follows:oil-gas distribution is controlled by palaeo-uplift,oil-gas mi- gration and accumulation by unconformity,reservoir scale by reservoir quality,vertical distribution by source-res- ervoir-seal assemblage,and the formation is controlled by broken-slope zone.