深层礁滩相气藏水侵优势通道刻画——以普光气田飞一、二段气藏为例

Water invasion dominant channel description of deep reef-beach gas reservoir:a case study of first and second Members of Feixianguan gas reservoir in Puguang gas field

普光气田是典型的深层礁滩相气田,储层孔隙类型多样,非均质性极强,投产4 a后开始有气井产水,急需摸清气藏水侵路径,为开发决策提供依据。文中从气田的静态、动态资料入手,明确裂缝和基质渗透率是影响水侵的主要因素,进一步提出了融合渗透率和裂缝的水侵通道因子,实现了三维空间上的水侵优势通道展布刻画,明确一类高渗带主要分布于TSQ1Ⅲ,TSQ1Ⅳ层序的普光103,104,105,107,以及201,2011井区,为推测水侵的可能路径及见水气井奠定了基础。

Puguang gas field is a typical deep reef-beach gas field with diverse pore types and strong heterogeneity.After four years of production,there are some gas wells producing water.Therefore it is urgent to find out the water invasion path of the gas reservoir and provide guidance for development decisions.This paper,based on the static and dynamic data of gas field,indicates that fracture and matrix permeability are the main factors affecting water invasion.Furthermore the factor of water invasion channel,both considering the effects of fracture and permeability,has been proposed,which leads to the description of dominant water invasion channel distribution in the three dimensional space.The results show that the top level of dominant water invasion channel is mainly distributed in well blocks 103,104,105,107 and 201,2011 of TSQ1Ⅲand TSQ1Ⅳsequences,which has laid a sound foundation to speculate about next possible water invasion path and water breakthrough gas wells.