准噶尔盆地南缘乌鲁木齐一带芦草沟组含油气页岩储层特征

Oil-bearing Shale Reservoirs Characteristics of Lucaogou Formation in Urumqi Region,Southern Margin of Junggar Basin

以钻探、地质综合录井、综合测井、核磁共振测井、电成像测井技术及实验测试为手段,以岩石矿物学特征、储层物性、储集空间类型和储集性能研究为重点,开展准南冲断带东段乌鲁木齐一带芦草沟组含油气页岩储层特征研究,结果表明:芦草沟组含油气页岩总厚23.8m,其中油层2层,累计厚13.4m,为中等含油饱和度页岩油气藏;薄片镜下显示页岩中油迹(油层)呈层状、条带状,垂直页岩层面浸染页岩层,浸染强度中等;页岩储层矿物成分以脆性矿物为主;含油气页岩储层储集空间类型由纳米-微米级孔隙和两期构造裂缝构成,第二期构造运动控制了芦草沟组的油气运聚,缝隙和溶蚀孔洞为主要油气储集空间,含油层段发育高角度高导缝隙。

Based on the results of the drilling,geological comprehensive logging,comprehensive logging,nuclear magnetic resonance logging,electrical imaging logging technology and experimental testing technology,the paper focuses on the study of the Petrological Mineralogical Characteristics,Reservoir Physical Properties,Reservoir Space Types and Reservoir Performance.The results show that the oil-bearing shale has a total thickness of 23.8m,of which 2 layers,cumulative thickness of 13.4m,are moderately oil-saturated shale reservoirs in Lucaogou Formation,and the Petroleum slices show that oil traces(reservoirs)in shale are layered,striped and vertical shale layers,and medium intensity of the dissemination;and the mineral composition of shale reservoirs is mainly brittle minerals;the reservoir space type of oil-gas shale reservoir is composed of nano-micron pore and two stages of structural fracture.The second stage of structural movement controls the oil-gas migration and accumulation of Lucaogou Formation in the study area.The main reservoir space is crevice and dissolution hole,and which shows that oil-bearing layers are characterized by high angle and high conductivity fractures.