基于生产动态资料的凝析气藏流体分布及潜力再认识--以渤海BZ油气田太古宇潜山为例

Recognition of fluid distribution and potential of condensate gas reservoir based on production performance data:a case study of Archean buried hill in BZ oil and gas field,Bohai Bay

针对渤海BZ油气田太古宇潜山凝析气藏投产后生产动态与初始静态认识存在较大差异的问题,综合利用钻井、测井、取样及DST等资料,结合生产动态资料,对该气藏类型、流体分布及资源潜力进行了再认识。结果表明:研究区太古宇潜山凝析气藏原油产出经历了凝析油—凝析油+黑油—黑油的过程,为一个带黑油油环的构造层状凝析气藏,而非勘探评价初期认为的构造层状凝析气藏;利用生产动态资料,结合天然水驱的带油环凝析气藏物质平衡方程,重新评估研究区太古宇潜山黑油油环储量为149.39×10^(4) m^(3),与静态容积法计算的地质储量(141.21×10^(4) m^(3))吻合度较高。目前,黑油油环采出程度低(8%),可作为BZ油气田下一步调整挖潜方向。

Aiming at the big difference between the production performance and the initial static state understanding of Archean buried hill condensate gas reservoir after production in BZ oil and gas field,Bohai Bay,the type,fluid distribution and resource potential of the condensate gas reservoir are recognized by comprehensive utilization of drilling,logging,sampling,DST data and production performance data.The results show that the crude oil of buried hill condensate gas reservoir has experienced the process from condensate oil to condensate oil and black oil and then to black oil,and it is a layered structural condensate gas reservoir with black oil rings,rather than the layered structural condensate gas reservoir considered in the initial exploration evaluation stage.By using the abundant production performance data and combining with the general formula of material balance equation of condensate gas reservoir with oil ring of natural water flooding,the reserve of black oil rings in Archean buried hill is 141.21×10^(4) m^(3),which is in good agreement with the geological reserve(149.39×10^(4) m^(3))calculated by static volumetric method.The recovery degree of black oil ring is low(8%),which can be used as the next potential direction of BZ oil and gas field.