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酒西盆地间泉子段储层流体赋存及渗流特征

Studies on the reservoir characteristics and the fluid flow in Jianquanzi member of the Jiuxi Basin,northwest China
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摘要 储层结构及其孔隙空间中流体的渗流特征是影响油气勘探与开发最关键的科学问题。以酒西盆地间泉子段的低—中孔中—高渗储层为研究对象,应用薄片观察、毛管压力测试、油—水和油—氮气两相流体的相对渗流实验研究了储层中流体的赋存和渗流特征。研究表明,储层按孔隙结构分为3类,其中Ⅰ类储层物性最好,毛管曲线有明显平台,偏粗歪度;结合流体饱和度测试结果认为油饱和度高的样品对应最大孔喉半径和中值半径均较大、歪度偏粗、排驱压力低;对比了高渗样品与低渗样品油水相渗曲线,发现高渗样品水相相对渗透率变化快,驱替效率高,低渗样品氮气—油相渗曲线相对油—水相渗曲线其残余油饱和度更低、两相共渗区更宽;储层的润湿性、孔隙结构和黏土矿物的含量为影响储层渗流特征的3个关键因素,较粗孔喉所占比例高及黏土矿物含量较低的样品储层原油的渗流条件较好,符合达西定律。研究成果表明研究区储层总体为水湿性,氮气驱油效率相对水驱油效率更高,特别对低渗储层氮气驱油效率提升明显,从而为本区低渗样品中油的开采动用提供指导。 Based on the thin sections observation,capillary pressure testing,relative permeability measuring and other experimental methods,distributed rules and flow characteristics of fluid in reservoirs of Jianqauanzi member,Jiuxi Basin,were studied.The results show that according to features of pore structure the pores can be divided into three kinds.I class has relatively good reservoir property,the capillary curves have significant platforms,and positive skewness.The samples with high oil saturation have the characteristics of thicker maximal radius and median radius,more positive skewness,lower entry pressure.Oil-water relative permeability of high permeability samples changes fast,the oil displacement efficiency of high permeability samples is high.Compared with oil-water relative permeability curves,the oil-nitrogen relative permeability curves have lower residual oil saturation and wider common permeable region.The wet ability,pore structure and contents of clay minerals are three key factors affecting fluid flow in reservoirs.The samples with high proportion of crude pore,low contents of clay minerals have good percolation condition,which conforms to Dercy's law.The reservoirs have the typical features of water-wet reservoirs.Nitrogen displacement efficiency was more efficient than water displacement efficiency,especially for the low permeability samples.
作者 张世铭 王建功 张小军 张婷静 曹志强 杨麟科 Zhang Shi-ming1,2 , Wang Jian-gong1,2 ,Zhang Xiao-jun1,2 , Zhang Ting-jing1,2, Cao Zhi-qiang3 ,Yang Lin-ke4 ( 1.PetroChina Research Institute of Petroleum Exploration and Development-Northwest (NWGI), Lanzhou 730020, China 2.Key Laboratory of Reservoir Description, CNPC, Lanzhou 730020, China ; 3.Liaojunmiao Oil filed Area ,PetroChina Yumen Oilfiled Company ,Jiuquan 735200,China ; 4.Research Institute of Exploration and Development ,PetroChina Yumen Oilfi'eld Company ,Jiuquan 735200,China)
出处 《天然气地球科学》 CSCD 北大核心 2018年第8期1111-1119,共9页 Natural Gas Geoscience
基金 国家科技重大专项“柴达木复杂构造区油气成藏、关键勘探技术与新领域目标优选”(编号:2016ZX05003-006) 中国石油重大科技专项“柴达木盆地建设千万吨油气田综合配套技术研究”(编号:2016E-0101)联合资助
关键词 酒西盆地 间泉子段 孔隙结构 流体赋存特征 渗流特征 Jiuxi Basin J uanqauanzi member Pore structure Fluids distribution Fluid flow characteristics
作者简介 张世铭(1986-),男,甘肃兰州人,工程师,硕士,主要从事沉积储层研究.E—mail:Zhang_sm@petrochina.com.cn.
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