Abstract:

The sedimentary system of the Sanjianfang Formation in Wenxi-Ⅰ and Wen-V blooks in Turpan Harmi Basin contains braided stream delta and subaqueous part of prodelta.They include mainly subaqueous distributory channal,flood plain,river mouth bar,sheet bar,distal bar and prodelta clay sedimentary microfacies,and channel bar and flood plain splay submicrofacies.Different microfacies resulted in different affections in reservoir characters,oil possibility and productivity due to different reservoir heterogeneities.Generally speaking,channel bar and distributary channel microfacies have better reservoir characters,their oil possibility and productivity are the best,whereas river uonth bar,sheet bar and distal bar are secondary,and flood splay is relatively poor.