准噶尔盆地车排子地区下切谷沉积体系及有利勘探方向

Entrenched valley depositional system and advantageous exploration direction of Chepaizi area in Junggar Basin

下切谷是准噶尔盆地西缘车排子地区的一种重要沉积体系。在分析了地震反射特征、沉积学特征以及电性特征的基础上,对准噶尔盆地西缘车排子地区下切谷沉积体系及有利勘探方向进行了研究。结果表明,该区的下切谷存在垂向加积充填型、侧向加积充填型、杂乱型和复合型等4种充填类型,以及单一型、多分支型、复合分支型3种分布样式,并具有明显的地震反射、沉积及电性特征。在该区横切下切谷断层的下降盘易于形成断层-岩性油气藏,这也是下切谷沉积体系发育的主要油气藏类型,并具有较好的油气显示。准噶尔盆地车排子地区东缘及南缘下切谷沉积体系入湖段低位扇体是该区寻找下切谷体系油气藏的重要方向。

Entrenched valley is an important depositional system in Chepaizi area in the west of Junggar Basin, Entrenched valley depositional system and advantageous exploration direction in the area were studied by analyzing the seismic reflection, sediment feature and electric feature. The results show that there are four kinds of filling styles including vertical accretion style, lateral accretion style, clutter style and composite style, three kinds of distribution styles including simple style, multibranched style and compound-branched style, and significant seismic reflection, sediment feature and electric feature in the area. The fauhithologic reservoir is formed easily in downthrow block of the fault and is the main reservoir type in this area. Entrenched valley system is confirmed to have satisfactory hydrocarbon show. The low stand apron in the entering-lake zone of the entrenched valley system in the east and south of the research area is the important exploitation part in the future.