低渗透砂岩油气藏裂缝综合预测

Synthetical prediction for fracture system of low permeability sandstone reservoir

低渗透砂岩储层中裂缝既是储油空间,又是油气运移的主要通道,对储层裂缝的描述和预测是其开发地质研究的重要内容。单一研究方法不能满足精细预测的需要,迫切需要将各种方法综合运用,以达到指导勘探开发的目的。以东濮凹陷户部寨气田为例,综合运用岩心描述、镜下观察、测井综合指数分析、地震属性分析、应力应变分析、裂缝开启性分析等方法,对沙四段低渗透致密储层裂缝的分布规律及开启性做出预测。

The fracture of low permeability sandstone reservoir is the storage space of petroleum and the main passage of its transportation.The description and prediction of reservoir fracture is a very important research for exploration and development.The recent single method of fracture prediction almost has some limitation to a certain extent because of the strong heterogeneity and low permeability of this reservoir.So methods of geology,well logging,seismic and tectonic stress field should be used synthetically to access to elaborate prediction.Taking Hubuzhai gas field of Dongpu Depression as an example,this paper uses core description,microscope observation,synthetical index of well logging,seismic attribute,stress-strain and fracture unsealing analysis to predict fracture distribution and unsealing extent.