摘要
孔喉特征是储集层研究的核心,厘清储集层孔喉在三维空间中的展布对油气勘探与开发意义重大。文中借助微纳米CT立体成像技术和数字岩心技术对川东北飞仙关组残余鲕粒白云岩的孔喉特征进行刻画与描述,建立了微纳米级的孔喉三维空间展布模型,并计算了孔喉半径、形状因子、空间连通性等表征参数。此外,结合扫描电镜、压汞曲线等传统方法,对所建立的模型进行了有益的探讨和补充。结果表明,川东北地区残余鲕粒白云岩孔隙类型主要有粒间孔、粒间溶孔(铸模孔)、晶间(溶)孔、晶间缝和微裂隙等。其中,晶间孔和微裂隙为连通的喉道,其最小值可达20～30 nm。样品重结晶强烈,受重结晶晶体的生长及后期压实等改造作用的影响,喉道堵塞,储集层渗透性差。
The research of pore and throat texture is a key issue for oil exploration and development.With micro-CT and numerical rock technology,the authors characterized the texture of pore and throat of residual oolitic dolostone of the Lower Triassic Feixianguan Formation in northeastern Sichuan Province,and established the 3D models in micro scale.Based on these models,its radius,shape factor and spatial connectivity were calculated.A further discussion on the models has been processed under the help of SEM and mercury injection.The result indicates that pore system of the residual oolitic dolostone include interparticle pore,interparticle dissolved pore（moldic pore）,intercrystalline（dissolved）pore,intercrystalline aperture,microfracture etc.The intercrystalline pore and microfracture are the connectivity pathway as throat.Its minimal size could be reduce to 20～30 nm.Recrystallization of the experimental sample is heavy,so the throat would be blocked due to the growth of the crystal and tectonic compaction after later diagenesis.
出处
《古地理学报》
CAS
CSCD
北大核心
2012年第2期187-196,共10页
Journal of Palaeogeography：Chinese Edition
基金
杭州地质研究院重点实验室技术方法基金项目(编号:131-01112B)资助
关键词
孔喉结构
微纳米CT
数字岩心
空间展布
pore and throat texture
micro-CT
numerical rock
spatial distribution
