鄂尔多斯盆地甘谷驿油田东部长6储层沉积微相研究

通过岩心、测井、化验资料综合分析，查明了鄂尔多斯盆地甘谷驿油田东部长6储层各砂组的沉积特征和沉积微相的平面展布规律，在砂岩和粉砂岩中发现了次生矿物海绿石，认为长6储集体发育的是一套三角洲前缘亚相砂体，而不是三角洲平原亚相，其中三角洲前缘亚相包括河口砂坝、远砂坝和支流间湾微相。在综合考虑宏观沉积背景及微观沉积特征的基础上,为了制定该油田注水开发方案,根据沉积相的演化规律,建立了研究区沉积模式。

STUDY ON SEDIMENTARY FACIES OF CHANG 6TH RESERVOIR IN THE EAST OF GANGUYI OILFIELD, ORDOS BASIN

The analysis of massive core samples, logging data and chemical materials reveals the depositional characteristics of sand groups, the rule of depositional microfacies distrubition in plane, and the existence of the secondary mineral of glauconite in sandstones and siltstones. The Chang 6th reservoir of eastern Ganguyi Oilfield, northern Shaanxi develops a set of deltaic front sandstones instead of deltaic plain subfacies. Deltaic front includes river mouth bar, far sand dam and branch bay microfacies. With macroscopic depositional settings and microscopic depositional characteristics into consideration, a depositional mode of the research area is established according to the evolving rule of sedimentary facies, which is significant for planning the water-injection development of oil-gas fields.