准噶尔盆地深层致密砂岩油藏富集机理与成藏模式——以莫西庄、永进地区为例  

Enrichment mechanisms and accumulation models of deep tight sandstone reservoirs in Junggar Basin:A case study of Moxizhuang and Yongjin areas

作　　者：马骥[1] 王金铎[1] 张奎华[1] 张关龙[1] 曾治平[1] 胡海燕 宫亚军[1] 张翊[1] MA Ji;WANG Jinduo;ZHANG Kuihua;ZHANG Guanlong;ZENG Zhiping;HU Haiyan;GONG Yajun;ZHANG Yi(Exploration and Development Research Institute,Shengli Oilfield Company,SINOPEC,Dongying City,Shandong Province,257015,China;College of Resources and Environment,Yangtze University,Wuhan City,Hubei Province,430100,China)

机构地区：[1]中国石化胜利油田分公司勘探开发研究院,山东东营257015 [2]长江大学资源与环境学院,湖北武汉430100

出　　处：《油气地质与采收率》2025年第2期60-71,共12页Petroleum Geology and Recovery Efficiency

基　　金：中国石化项目群“准噶尔盆地腹部超深层P-T成藏规律及勘探关键技术”(P22127)。

摘　　要：准噶尔盆地中部莫西庄和永进地区侏罗系砂岩中发现工业油气流,一些地区侏罗系埋深达6000m,储层孔隙度和渗透率极低,属于特低孔和特低渗透储层。在如此致密的储层中,需要系统探讨和阐述原油充注动力、油气来源与运移过程。为揭示原油在致密砂岩储层中的富集过程与主控因素,采用生物标志化合物确定油气来源及原油的主力烃源岩;通过定量和半定量方法研究断层在水平和垂直方向的滑移距离以及断层的封闭性,应用统计与地质分析相结合阐述断层规模与试油产量的关系,明确断层规模、断距对油气成藏的意义;采用微米CT扫描、恒速压汞、核磁共振、物理模拟系统刻画和表征砂岩孔隙结构参数以及流体在这些致密储层的聚集模式。结果表明:原油主要来源于二叠系烃源岩;规模大和活动强度高的断层为油气垂向运移通道,地质时期水平和垂向移动距离超过700 m且规模达到20 km以上的断层有较好的油气输导能力,而小规模和移动距离较小的断层大多起封闭作用;致密储层孔隙半径较小,主要分布在163.8~207.7μm,喉道半径为0.5~8.1μm,微观孔隙结构的非均质性特征导致原油的差异性充注与富集,中孔-粗喉型储层含油程度最高,大孔-细喉和小孔-细喉型次之,小孔-微喉型含油程度最低。侏罗系致密砂岩成藏主要受活动强度高且规模较大的断裂以及致密砂岩孔隙结构影响与控制。Commercial oil and gas flow was discovered in the Jurassic sandstones of Moxizhuang and Yongjin areas in the central Junggar Basin.The reservoir porosity and permeability are very low in some areas where the buried depth of the Jurassic reaches 6000 m,belonging to ultra-low porosity and ultra-low permeability reservoirs.In such tight reservoirs,the charging power of crude oil,the source of oil and gas,and the migration process need to be systematically discussed.Biomarkers were used to determine the source of oil and the main source rocks of crude oil in tight sandstone reservoirs to reveal the enrichment process and main controlling factors of crude oil in tight sandstone reservoirs.The slip distances of the faults in horizontal and vertical directions and the sealing properties of the faults were studied by quantitative and semi-quantitative methods,and the relationship between fault size and oil test production was clarified by combining statistics and geological analysis.Moreover,the influence of fault size and fault distance on oil and gas accumulation was explored.Micro-CT scanning,constant-rate mercury injection,nuclear magnetic resonance(NMR),and physical simulation were applied to systematically describe and characterize the pore structure parameters of sandstones and fluid accumulation models in these tight reservoirs.The results show that the crude oil is mainly from the Permian source rocks.The faults with large sizes and high activity intensity are vertical migration channels of oil and gas,and the faults with horizontal and vertical movement distances of more than 700 m and a size of more than 20 km at geological time have better oil and gas transport capacity.However,the faults with small sizes and short movement distances are mostly closed.The pore sizes of the tight reservoirs are small,mainly in the range of 163.8-207.7μm,and the throats are 0.5-8.1μm.The heterogeneity of the micro-pore structures leads to the differential charging and enrichment of crude oil.The oil content of reservoirs with

关 键 词：致密砂岩 断层 微米CT扫描 核磁共振 准噶尔盆地 

分 类 号：TE122.3[石油与天然气工程—油气勘探]