【摘要】 通过岩心观察、粒度分析、测井相、古地理环境等方面的研究,吐哈盆地七泉湖构造带在三间房组二段沉积期,构造带南缘以辫状河三角洲沉积为主。其各种微相的展布受控于水体的变迁,西部七泉湖构造主要以辫状河道、河道间、辫状河三角洲水下分流河道微相为主,而在玉果构造还发育有河口坝等微相。其中三间房组二段沉积中期所形成的水下分流河道和河口坝砂体是有利的勘探目标。更多还原

【Abstract】 The southern brim of the structural belt is dominated by braid river delta deposition at the depositional stage of J₂s J₂s² of Qiquanhu structural belt in Tuha basin according to the analysis of core observation,grading analysis, electrofacies and paleo-geographic setting.The various microfacies distribution is controlled by variance of water body.Western Qiquanhu structure is dominated by braided channel,interchannel,underwater distributary channel microfacies of braided river delta,but mouth bar microfacies is developed in Yuguo structure.The underwater distributary channel and mouth bar sand formed in middle stage of J₂s J₂s² deposition are favorable exploration target.更多还原