松辽盆地古龙页岩储集空间类型及油赋存状态  

Reservoir space types and oil occurrence of Gulong shale in Songliao Basin

作　　者：张安达[1,2] 王继平 王永超[1,2] 洪淑新 谭文丽 ZHANG Anda;WANG Jiping;WANG Yongchao;HONG Shuxin;TAN Wenli(Exploration and Development Research Institute of Daqing Oilfield Co Ltd,Daqing 163712,China;Heilongjiang Provincial Key Laboratory of Continental Shale Oil,Daqing 163712,China)

机构地区：[1]大庆油田有限责任公司勘探开发研究院,黑龙江大庆163712 [2]黑龙江省陆相页岩油重点实验室,黑龙江大庆163712

出　　处：《大庆石油地质与开发》2021年第5期68-77,共10页Petroleum Geology & Oilfield Development in Daqing

基　　金：国家科技重大专项“松辽盆地北部致密油资源潜力、甜点区预测与关键技术应用”(2016ZX05046-006-002)。

摘　　要：松辽盆地古龙页岩油是源储一体的非常规资源,页岩油勘探开发上已获得实质性突破。古龙页岩储层微观孔缝类型多样,页岩油在微观孔缝系统内赋存机制也较复杂。为了明确页岩储集空间成因及油在微观储集空间内的赋存状态,通过薄片鉴定、CT扫描、环境扫描电镜分析、场发射扫描电镜—光镜联用原位微观组构特征分析、页岩微—纳米孔隙全尺度分析和页岩油激光共聚焦三维重建等技术,对古龙页岩储层的岩性、微观组构、储集空间类型及成因等方面进行分析。结果表明:古龙页岩储层重点层段发育6种岩石类型,其中以页岩为主,其余为粉砂质页岩、云质页岩、灰质页岩、粉砂岩和细砂岩;页岩中纹层状构造发育,纹层密度多达9条/mm,页岩孔喉最为发育,发育有机质孔缝和粒间孔,形成的孔缝网络系统是页岩油运移和存储的良好场所;微观显微图像特征显示不同类型储集空间均可见到页岩油富集,页岩含油性好,原油体积分数高达6.83%,轻重组分略具分异现象,呈分散状零星分布于骨架颗粒之间。研究成果为下一步页岩油资源潜力评价及其可流动性评价提供了直接的技术支撑。Shale oil is unconventional source-reservoir integrated resource of Gulong in Songliao Basin,and its exploration and development have got substantial achievement.There are various types of micro-pores and micro-fractures in the shale reservoirs in Gulong,with complex occurrence mechanism of shale oil in micro-pore and micro-fracture system.Technology of thin section analysis,CT scanning,ESEM,FE-SEM-LM for in-situ microfabric analysis,full-scale micro-nano pore analysis and laser confocal 3 D reconstruction are used to study lithology,microfabic and reservoir space type and genesis in Gulong shale.The results show 6 rock types in the key interval in Gulong shale,including mainly shale and secondly silty shale,dolomitic shale,calcareous shale,siltstone and fine sandstone.Laminar structure is well developed in the shale,with lamina density up to 9 stripes/mm.Pore throat is the most developed in the shale,including organic matter-hosted pores and fractures and intergranular pores,forming pore and fracture network system favorable for shale oil migration and accumulation.Microscopic images show that enriched shale oil can be observed in different types of reservoir space,among which shale has the good oil-bearing property with oil volume fraction up to 6.83%,light and heavy components of shale oil slightly different and scattered among skeleton particles.Study results provide technical support for further evaluations of shale oil resource potential and mobility.

关 键 词：古龙页岩 原位微观组构特征 页岩微—纳米孔隙全尺度分析 页岩油激光共聚焦三维重建 孔缝网络系统 赋存状态 

分 类 号：TE122.2[石油与天然气工程—油气勘探]