白音查干凹陷达尔其油田油气成藏规律

达尔其油田位于内蒙古二连盆地川井坳陷北部白音查干凹陷南斜坡白音构造带上.其主要生、储油层系为下白垩统的阿尔善组、腾格尔组和都红木组第一段,为河流-三角洲-深湖沉积体系.达尔其油田烃源岩丰度普遍较高,但不同烃源层成熟度差异大;储集条件总体来说比较好,但非均质性较强;具备良好的区域盖层条件.该区主要发育高部位断背斜油藏、中部位岩性-构造油藏和低部位构造-岩性油藏,油气遵循"临油源短运移就近聚集,'Y'字形断阶式成藏,油气聚集区呈'条带状'分布的富集规律".

Accumulation patterns of the oil reservoirs in the Daerqi area, Baiyinchagan sag, Inner Mongol, China sag, Inner Mongol, China

The Daerqi oilfield founded in the Baiyinchagan sag,Erlian basin locates on the southern slope of the Baiyin structure belt.The main source rock and reservoir are distributed over the Lower Cretaceous Aershan Formation,Tenggeer Formation and the first member of the Duhongmu Formation.The depositional system is fluvial-delta-lake.The source rock in this area is abundant but the different ones have great maturity difference.And the reservoir condition is good with high heterogeneity and good seal condition.There develops higher faulted anticline pools,middle lithologic-structural pools and lower structural-lithologic pools in the area.The oil and gas accumulation shows itself near petroleum source,short migration and handy accumulation,"Y" type and ladder fault and banded petroleum zone.