温西一、温五区块三间房组沉积微相与油气产能

SEDIMENTARY MICROFACIES AND PETROLEUM PRODUCTIVITY OF SANJIANFANG FORMATION IN WENXI Ⅰ AND WEN V BLOCKS

吐哈盆地温西一、温五区块三间房组沉积体系主体为辫状河三角洲前缘前三角洲水下部分，主要发育了辫状河水下分流河道、水下分流河道间、河口砂坝、前缘席状砂、远砂坝、前三角洲泥等微相和水下心滩砂坝、水下决口扇亚微相。不同沉积微相由于其储层非均质性强弱不同，导致对油层物性、含油气性以及油气产能的影响不同。水下心滩砂坝、水下分流河道微相的油层物性好，含油气性及单井油气产能最高，河口砂坝、席状砂、远砂坝微相次之，水下决口扇微相相对则较差。

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.