准噶尔盆地玛东斜坡百口泉组岩性油气成藏特征——以陆梁油田YB4井区为例

针对近年准噶尔盆地玛东斜坡百口泉组岩性油气藏成藏机制及分布规律不清的问题，运用层序地层学与沉积相成因理论，精细剖析了YB4井区已发现油气的成藏特征与条件。揭示该区百口泉组油气藏主要为上倾尖灭岩性型，主要受控于“发育上倾尖灭的扇根河道或辫状河道砂体”、“上倾方向有泥石流封堵”、“上覆有高水位泥质盖层”和“下倾方向有沟通油源的断层”4个基本因素，其中“泥石流封堵”和“高水位泥质盖层”是其成藏的关键控制因素。该上倾尖灭岩性油气藏主要分布于百口泉组水进体系域上部的百二段顶部与百三段底部，是今后玛东斜坡区主要找油目标。

Lithologic hydrocarbon accumulation characteristics of Baikouquan Formation,Madong Slope,Junggar Basin: a case of YB 4 well block,Luliang Oil Field

In view of the unclear mechanism and distribution of lithologic reservoirs in the Baikouquan Formation on the Madong Slope of Junggger Basin in recent years, the sequence stratigraphy and sedimentary facies theory were used to analyze the characteristics and accumulation conditions of oil and gas reservoirs found in YB 4 well block. It is revealed that the lithologic reservoirs of the Baikouquan Formation in this area are mainly updip-tip-type, which are mainly controlled by four basic factors:“the development of a fan root channel or a alluvial channel sand body with an updip tip”, “debris flow plugged in upward direction”, “covered with high water level muddy caprock”, “a fault with a source of oil in the downdip direction”. Among them, the “debris flow plugging” and “high water level mud caprock” are the key controlling factors to hydrocarbon accumulation. The updip-tip-type oil and gas reservoirs are mainly distributed at the top of the T₁b₂ and the bottom of the T₁b₃, which are located in the upper part of the transgressive system tract of the Baikouquan Formation. In the future, it will be the main oil and gas exploration target in the Madong Slope area.