准噶尔盆地玛湖凹陷二叠系风城组全粒序储层孔喉结构与原油可动性关系  

Relationship between pore throat structure and crude oil mobility of full particle sequence reservoirs in Permian Fengcheng Formation,Mahu Sag,Junggar Basin,NW China

作　　者：唐勇[1] 贾承造 陈方文[3] 何文军[1,4] 支东明 单祥 尤新才 姜林[7] 邹阳[1] 吴涛 谢安[5] TANG Yong;JIA Chengzao;CHEN Fangwen;HE Wenjun;ZHI Dongming;SHAN Xiang;YOU Xincai;JIANG Lin;ZOU Yang;WU Tao;XIE An(Research Institute of Exploration and Development,Xinjiang Oilfield Company,PetroChina,Karamay 834000,China;China National Petroleum Corporation Limited,Beijing 100007,China;National Key Laboratory of Deep Oil and Gas,China University of Petroleum(East China),Qingdao 266580,China;School of Geosciences,China University of Petroleum(Beijing),Beijing 102249,China;Xinjiang Research Institute of Huairou Laboratory,Urumqi 830000,China;Hangzhou Research Institute of Geology,PetroChina,Hangzhou 310023,China;Research Institute of Petroleum Exploration&Development,PetroChina,Beijing 100083,China)

机构地区：[1]中国石油新疆油田公司勘探开发研究院,新疆克拉玛依834000 [2]中国石油天然气集团有限公司,北京100007 [3]深层油气全国重点实验室(中国石油大学(华东)),山东青岛266580 [4]中国石油大学(北京)地球科学学院,北京102249 [5]怀柔实验室新疆研究院,乌鲁木齐830000 [6]中国石油杭州地质研究院,杭州310023 [7]中国石油勘探开发研究院,北京100083

出　　处：《石油勘探与开发》2025年第1期99-111,共13页Petroleum Exploration and Development

基　　金：自治区天山英才-科技创新领军人才支持项目(2022TSYCLJ0070);中国石油天然气股份有限公司前瞻性基础性研究重大科技项目(2021DJ0108);山东省自然科学优秀青年基金项目(ZR2022YQ30)。

摘　　要：基于铸体薄片、低温氮气吸附、高压压汞、核磁共振T2谱、接触角和油水两相界面张力等实验结果,揭示准噶尔盆地玛湖凹陷下二叠统风城组全粒序储层孔喉结构与原油可动性关系。研究表明:①随玛湖凹陷风城组储层粒级变小,较大喉道所连通孔隙体积和较大孔隙体积均呈减小趋势,喉道半径和孔隙半径分布范围和峰值范围均有序向小尺寸偏移;风城组非常规储层喉道半径、孔隙度和渗透率上限值分别约为0.7μm,8%,0.1×10^(-3)μm^(2);②风城组储层赋存滞留油、可动油的孔隙分布范围和峰值范围均随储层粒级变小而有序向小尺寸偏移;粒级较大储层样品赋存滞留油量、可动油量随驱动压力增大分别呈现更加明显的降低和升高趋势;③风城组各粒级储层中原油驱动压力随喉道半径增大而呈现快速下降、缓慢下降和趋于稳定3个阶段;原油驱动压力和各粒级储层原油驱动压力差异均随温度升高而降低,随喉道半径增大而降低。根据以上实验分析,推断地质条件下玛湖凹陷风城组深部页岩油具有较大的动用潜力。Based on the experimental results of casting thin section,low temperature nitrogen adsorption,high pressure mercury injection,nuclear magnetic resonance T2 spectrum,contact angle and oil-water interfacial tension,the relationship between pore throat structure and crude oil mobility characteristics of full particle sequence reservoirs in the Lower Permian Fengcheng Formation of Mahu Sag,Junggar Basin,are revealed.(1)With the decrease of reservoir particle size,the volume of pores connected by large throats and the volume of large pores show a decreasing trend,and the distribution and peak ranges of throat and pore radius shift to smaller size in an orderly manner.The upper limits of throat radius,porosity and permeability of unconventional reservoirs in Fengcheng Formation are approximately 0.7µm,8%and 0.1×10^(-3)μm^(2),respectively.(2)As the reservoir particle size decreases,the distribution and peak ranges of pores hosting retained oil and movable oil are shifted to a smaller size in an orderly manner.With the increase of driving pressure,the amount of retained and movable oil of the larger particle reservoir samples shows a more obvious trend of decreasing and increasing,respectively.(3)With the increase of throat radius,the driving pressure of reservoir with different particle levels presents three stages,namely rapid decrease,slow decrease and stabilization.The oil driving pressures of various reservoirs and the differences of them decrease with the increase of temperature and obviously decrease with the increase of throat radius.According to the above experimental analysis,it is concluded that the deep shale oil of Fengcheng Formation in Mahu Sag has great potential for production under geological conditions.

关 键 词：准噶尔盆地 玛湖凹陷 下二叠统 风城组 全粒序储层 孔喉结构 原油可动性 全油气系统 

分 类 号：TE122[石油与天然气工程—油气勘探]