摘要
基于铸体薄片、扫描电镜、压汞分析等技术手段,对南泥湾采油厂294井区长62油层组的储层微观孔隙结构特征进行研究,并对影响孔隙结构的主要因素进行分析。结果表明,研究区长62储层属于低孔、特低渗储层,孔隙以残余粒间孔、溶蚀粒间孔和粒内溶孔为主。孔隙以小孔隙为主。储层喉道主要有两类:其中微喉道占主导,其次是微细喉道,研究区孔隙结构主要受到沉积相带、成岩作用影响,孔喉结构类型与沉积相带耦合性高,是控制储层展布特征的主要因素。根据毛管压力曲线相关参数将孔隙结构特征分为3类,即低排驱压力—细喉道型(Ⅰ类);中排驱压力—微细喉道型(Ⅱ类);高排驱压力—微喉道型(Ⅲ类),并认为低排驱压力—细喉道型是研究区长62段的主要的储层类型,孔隙结构受到沉积相带、成岩作用控制。
Based on the rock thin section observation, cast image analysis and ressure mercury penetra- tion, pore genetic type and pore structure of Chang 62 reservoir in 294 well field,Zhidan Oil field are ana- lyzed and studied. The result shows that Chang 6 reservoir is characterized by low porosity and ultra--low permeability. The pore types mainly include residual primary intergranular pore, corrosion intraparticle pore, corrosion interparticle pore. small pore and fine -- microthroat are the main pore throat characteris- tics, which provides the major reservoir space and seepage channel of Chang 62 reservoir. Small pore and fine -- microthroat are the main pore throat characteristics,which provides the major reservoir space and seepage channel. The structure type of pore throat is highly coupled with the sedimentary facies, which is the main factor to control the distribution characteristics of the reservoir. The result shows that the pore structure can be divided into three types, including low displacement pressure--thin throat （type Ⅰ ）,medi- an displacement pressure--micro throat （type Ⅱ ）,high displacement pressure--micro throat （type Ⅲ ）. low displacement pressure--thin throat（type Ⅰ ） are considered as the dominated reservoirs. The reservoir qual- ity is controlled mainly by the sedimentary facies and diagenesis, the pore structure are controlled by diagenesis and Sedimentary facies.
出处
《内蒙古石油化工》
CAS
2017年第3期121-124,共4页
Inner Mongolia Petrochemical Industry
关键词
超低渗
微观孔隙结构
延长组
鄂尔多斯盆地
Ultra--low permeability
Micro-- pore structure
Yanchang Formation
Ordos Basin
