Reanalysis of Reservoir Accumulation Mechanism in Nanbaxian Oil-gas Field

南八仙复杂断块油气田,其油气藏富集受构造、断层、岩性等多重因素的控制。深层E13气藏为原生高压气藏,且以凝析气藏为主;中浅层N1—N22气藏为次生正常压力油气藏,油气藏类型复杂多样。参考近期区域勘探研究成果,试采开发动态资料,分析了南八仙＂上油下气、以气为主＂的成藏规律,认为E13气藏为2期充注,构造相对完整,圈闭保存条件好,形成异常高压原生气藏;E23原生油气藏受到后期仙北大断层的破坏,油气向浅层运移聚集;N1—N22油气藏为断层、岩性圈闭的产物,一期充注,属正常压力的次生油气藏,油气主要富集于圈闭条件较好的仙北大断层的下盘。The hydrocarbon concentration of Nanbaxian oil-gas field which is complex fault block reservoirs are controlled by many factors such as structure,fault,lithology,and so on.The oil-gas field has a variety of reservoiring schema,while the deep E31 strata composed a native high-pressure gas reservoir and the middle-shallow N1-N22 strata composed a secondary normal-pressure oil-gas reservoir.Based on the latest exploration results and dynamic exploitation data this paper analyzed the reservoir accumulation pattern of "oil in upper strata and gas in lower strata" and reached following conclusions:The E31 gas reservoir,which was formed by the second period of injection,is an abnormally high-pressure protogene reservoir with good trapping conditions;The protogene E32 reservoir was destroyed by Xianbei fault formed during later period,which allowed the migration of hydrocarbon to upper strata;The N1-N22 reservoir was the result from effects of faults and lithology,which was a normal-pressure secondary oil-gas reservoir and formed by the first period of injection.The conclusions have directive significances to the exploitation of Nanbaxian oil-gas field.中文核心期刊要目总览(PKU)中国科技核心期刊(ISTIC)中国科学引文数据库(CSCD)05876-8832