摘要
页岩油储层储集特征及其赋存形式研究是提高页岩油有利储层钻遇率、实现高效动用开发的基础。综合运用露头、岩心及薄片观察、X射线衍射全岩矿物分析、高压压汞、低温氮气吸附、核磁共振和场发射环境扫描电镜等储层表征技术,对准噶尔盆地博格达地区中二叠统芦草沟组开展了页岩油岩相划分与岩相发育控制因素分析、储集空间、孔隙结构及页岩油赋存形式研究。研究认为芦草沟组受物源、气候及湖平面升降等沉积环境周期性变化影响岩性变化快,为陆源碎屑组分和碳酸盐组分混合沉积,可划分为泥页岩相、砂岩相和碳酸盐岩相3类:泥页岩相储层以纳米级粒(晶)间溶孔为主,其次为粒间孔、纹层理缝,可见有机质孔、构造裂缝等;砂岩和碳酸盐岩相以微米级粒(晶)间溶孔为主,其次为晶间孔、粒内溶孔和粒间孔。识别出裂缝型、孔隙型、薄膜型、毛管型、颗粒型、吸附型6种主要的页岩油微观赋存形式,富有机质纹层状页岩相页岩油赋存形式以裂缝型、孔隙型和吸附型为主,可动性相对较好;富(含)有机质块状—层状泥岩相和含有机质块状—层状粉砂质泥岩相页岩油赋存形式以毛管型和吸附型为主,可动性差;砂岩相和碳酸盐岩相页岩油以孔隙型、薄膜型和毛管型为主,可动性好。预测奇台庄地区和柴窝堡凹陷中北部地区为页岩油有利储层发育区。
The studies on the shale-oil-reservoir accumulating characteristics and their occurrence forms are the basement of improving the drilled rate of the favorable reservoirs and realizing the high-efficiency development.With the help of the comprehensive application of the reservoir characterizing techniques,such as the outcrop,core and thin section observations,X-ray diffraction analysis of the whole core mineral,high-pressure mercury injection,low-temperature nitrogen adsorption,nuclear magnetic resonance(NMR)and field-emission-environment scanning electron microscopy,the shale oil lithofacies division and the lithofacies controlling factor analysis were conducted,and moreover the accumulating space,pore structure and shale-oil occurrence form of Middle Permian Lucaogou Formation in Bogda area of Junggar Basin were researched.It is considered that the rapidly changed lithologies of Lucaogou Formation are due to the periodic changes of the sedimentary environment,such as the provenance,climate and lake level rise-fall and so forth.The mixed sedimentation with the terrigenous clastic component and carbonate component can be divided into three types:mud shale lithofacies,sandstone lithofacies and carbonate lithofacies;the shale lithofacies reservoirs are mainly dominated by nano-scale intergranular(crystalline)dissolved pores,followed by the intergranular pores,striated bedding fractures and visible organic pores and structural fractures,etc.;the sandstone and carbonate lithofacies are predominately dominated by micron-scale intergranular(crystalline)dissolved pores,followed by intercrystalline pores,intragranular dissolved pores and intergranular pores.Six microscopic occurrence forms of the shale oil are identified,including fracture type,pore type,film type,capillary type,particle type and adsorption type.The shale-oil occurrence forms rich in the organic-matter laminated shale lithofacies are mainly fracture type,pore type and adsorption type,which are with relatively good mobility,while the shale-oil occurrence forms rich in(containing)organic matter block-layered silty mudstone lithofacies and organic-matter-bearing block-layered silty mudstone lithofacies are mainly the capillary type and adsorption type,which are with rather poor mobility.The shale-oil occurrence forms in the sandstone and carbonate lithofacieses are mainly the pore type,film type and capillary type with good mobility.It was predicted that Qitaizhuang area and the north-central area of Chaiwobao Sag are the favorable shale-oil-reservoir developed areas.
作者
王圣柱
WANG Shengzhu(Exploration and Development Research Institute, SINOPEC Shengli Oilfield Company, Dongying 257015, China)
出处
《大庆石油地质与开发》
CAS
CSCD
北大核心
2021年第1期1-16,共16页
Petroleum Geology & Oilfield Development in Daqing
基金
“十三五”国家科技重大专项“准噶尔盆地碎屑岩层系油气富集规律与勘探评价”(2016ZX05002-002)
中国石油化工股份有限公司课题“山前带油气成藏规律及目标评价”(P17001-3)
中国石油化工股份有限公司课题“准东南地区二叠系油气地质条件及勘探潜力”(P18054-2)。
关键词
准噶尔盆地
博格达地区
芦草沟组
页岩油
岩相类型
储集空间
赋存形式
Junggar Basin
Bogda area
Lucaogou Formation
shale oil
lithofacies type
accumulating space(AS)
occurrence form
