陕北丰富川油田低渗透油藏整体开发配套技术

Integrated development technology of Fengfuchuan Oilfield in Shanbei.

丰富川油田长2油层属低渗透砂岩油藏,平均渗透率为8.4×10-3μm2,孔隙度13.5%。储层为三角洲平原分流河道砂体,岩性主要为细粒长石砂岩,胶结致密。油层平均厚度12 m,埋深400600 m。油水分布具有明显的分带性,自下而上可分为纯水带、油水过渡带和纯油带。针对该油田油藏地质特征,实施了整体开发配套技术,从2000年发现到2003年,建成年产原油30×104t,实现了该油田快速高效开发。

The Chang-2 Formation of Fengfuchuan Oilfield is a low permeability sandstone oilfield with an average permeability of 8.4×10^(-3)μm^2 and average porosity of 13.5%.The reservoir type is delta plain facies distributary channel sandbody,and the lithology is mainly composed of fine arcose with a compact cementation.The reservoir thickness is 12m with a buried depth of 400～600 m.The distribution of oil and water has distinct zonality. Pure water zone,oil/water transition zone and pure oil zone are distributed from bottom to top.According to the reservoir geological characteristics,integrated development technology was implemented,which achieved the effective development of this oilfield,and 30×10~4 t annual capacity was established by 2003 since the discovery in 2000.