吉木萨尔凹陷二叠系井井子沟组二段致密砂岩储层特征及致密油富集主控因素  

Tight sandstone reservoir characteristics and main controlling factors of tight oil enrichment in the second member of Permian Jingjingzigou Formation in Jimsar Sag

作　　者：何周[1] 纪雪冰 谢安 王东学[1] 王智忠[1] 谭强[1] 马爱钰 帕孜力·阿布都克里木 张韵洁 赵晓东 He Zhou;Ji Xuebing;Xie An;Wang Dongxue;Wang Zhizhong;Tan Qiang;Ma Aiyu;Pazili Abudoukelimu;Zhang Yunjie;Zhao Xiaodong(School of Petroleum,China University of Petroleum(Beijing)at Karamay,Karamay,Xinjiang 834000;Exploration and Development Research Institute,Xinjiang Oilfield Company,CNPC,Karamay,Xinjiang 834000;Research Management Office of Xinjiang Research Institute,Huairou Laboratory,Ürümqi 830000)

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]中国石油大学(北京)克拉玛依校区石油学院,新疆克拉玛依834000 [3]怀柔实验室新疆研究院科研管理处,乌鲁木齐830000

出　　处：《地质科学》2025年第1期33-43,共11页Chinese Journal of Geology(Scientia Geologica Sinica)

基　　金：新疆维吾尔自治区“一事一议”引进战略人才项目(编号:XQZX20240054);克拉玛依市创新环境建设计划(创新人才)项目(编号:20232023hjcxrc0049,20232023hjcxrc0047)资助。

摘　　要：2023年12月,吉木萨尔凹陷新疆油田探区在二叠系井井子沟组二段发现了致密砂岩油藏,但致密储层特征和致密油富集主控因素不清,制约着油气勘探开发进展。为了精细表征致密砂岩储层特征,本文利用岩心、铸体薄片、高压压汞、核磁共振、氮气吸附等方法,开展了储层岩石学特征以及孔隙结构特征研究,从原油生成到聚集过程探讨了致密油富集主控因素,并建立了研究区致密油成藏模式。研究表明:1)储层岩性主要以细砂岩为主,为长石岩屑砂岩,成熟度低;平均孔隙度8.04%,平均渗透率0.04×10^(-3)µm^(2),主要以溶蚀孔为主,微米级孔隙为主要储集空间,纳米级喉道为渗流通道。2)二叠系井井子沟组上覆芦草沟组优质烃源岩大面积连续分布,Pr/Ph、Pr/nC_(17)以及β/NC_(max)等地化参数显示井井子沟组二段原油与上覆芦草沟组下部烃源岩相似,证实芦草沟组下部烃源岩为井井子沟组供烃。3)优质烃源岩、断裂、储层、超压等因素联合控制着井井子沟组二段致密油藏的富集。4)基于源储关系、输导体系以及运移动力,建立了“源储紧邻,超压输导,垂侧运聚式”成藏模式。研究成果对二叠系井井子沟组二段致密油勘探及地质研究具有一定的推进作用。In December 2023,a tight sandstone reservoir was found in the Jingjingzigou Formation in the Xinjiang oilfield exploration area of the Jimsar Sag.However,the source of oil and gas and the accumulation model are unclear,which restricts the progress of oil and gas evaluation and development.In order to accurately characterize the characteristics of tight sandstone reservoirs,core,cast thin sections,high-pressure mercury injection,nuclear magnetic resonance,nitrogen adsorption and other data were used to clarify the petrological characteristics and pore structure characteristics of reservoirs.The main controlling factors of tight oil enrichment were discussed from the process of crude oil generation to accumulation,and the tight oil accumulation model in the study area was established.The research shows that:1)the lithology of the tight reservoir of Jingjingzigou Formation is mainly fine sandstone,and the rock type is mainly feldspar clastic sandstone with low maturity.The average porosity is 8.04%,and the average permeability is 0.04×10^(-3)μm^(2).There are mainly dissolution pores,micron-sized pores as the main reservoir space,and nano-sized throats as seepage channels.2)The geochemical parameters such as Pr/Ph,Pr/nC_(17) and β/NC_(max) show that the crude oil of Jingjingzigou Formation is similar to the source rock of the lower part of the overlying Lucaogou Formation,which confirms that the source rock of the lower part of Lucaogou Formation is the source rock of Jingjingzigou Formation.3)High-quality source rocks,faults,reservoirs,overpressure and other factors jointly control the enrichment of tight oil reservoirs in Jingjingzigou Formation.4)Based on the source-reservoir relationship,transport system and migration dynamics,we established the reservoir-forming model of source-reservoir adjacent,overpressure transport,vertical migration and accumulation.The research results will play a certain role in promoting the tight oil exploration and geological research of Jingjingzigou Formation.

关 键 词：致密油 致密砂岩储层 核磁共振 氮气吸附 井井子沟组二段 吉木萨尔凹陷 

分 类 号：P618.13[天文地球—矿床学]