准噶尔盆地昌吉油田吉7井区P_(3)wt_(1)^(2)砂组沉积演化特征  

Sedimentary Evolution Characteristics of Sand Group 2 in the First Member of Upper Permian Wutonggou Formation in Ji 7 Well Area,Changji Oilfield,Junggar Basin

作　　者：王炜龙 胡可 徐田录 罗鸿成 魏庆婷 王青春 危宇宁[3] 贺萍 WANG Weilong;HU Ke;XU Tianlu;LUO Hongcheng;WEI Qingting;WANG Qingchun;WEI Yuning;HE Ping(Jiqing Oilfield Work Area,Xinjiang Oilfield Company,Changji 831700,China;Hebei GEO University,Shijiazhuang 050031,China;Liaoxing Oil and Gas Development Company,Liaohe Oilfield Company,Panjin 124213,China)

机构地区：[1]新疆油田公司吉庆油田作业区,新疆昌吉州831700 [2]河北地质大学地球科学学院,河北石家庄050031 [3]辽河油田公司辽兴油气开发公司,辽宁盘锦124213

出　　处：《河北地质大学学报》2025年第2期32-41,共10页Journal of Hebei Geo University

摘　　要：通过地层精细划分与对比,结合区域地质背景以及地震、测井和岩心资料,将准噶尔盆地昌吉油田吉7井区上二叠统梧桐沟组一段2砂组(P_(3)wt_(1)^(2))划分成了P_(3)wt_(1)^(2-1)、P_(3)wt_(1)^(2-2)、P_(3)wt_(1)^(2-3)共3个小层。在岩心相、测井相和沉积旋回分析基础上,通过单井、剖面和平面沉积微相分析,认为研究区P_(3)wt_(1)^(2)砂组岩石类型主要为砾岩、砂砾岩、砂岩等粗碎屑岩,形成于辫状河三角洲-湖泊沉积环境,其中三角洲前缘亚相的水下分流河道、漫流砂、席状砂微相发挥了主导作用。演化过程中,在垂向上表现为水下分流河道的频繁变换,其间穿插有漫流砂微相和分流间湾微相;平面上沉积物主要从研究区东南方向搬运而来,早期以辫状河三角洲前缘亚相水下分流河道微相为主,而后随着水动力条件的降低,水下分流河道微相沉积范围逐步缩减,漫流砂微相、分流间湾微相逐渐增加。Combined with regional geological background,seismic,logging and core data,through the fine division and comparison of strata,the Sand Group 2 of the First Member of Upper Permian Wutonggou Formation(P_(3)wt_(1)^(2))in Ji 7 well area of Changji Oilfield in Junggar Basin is divided into three layers:P_(3)wt_(1)^(2-1),P_(3)wt_(1)^(2-2)and P_(3)wt_(1)^(2-3).Based on the analysis of core facies,logging facies and sedimentary cycles,through the analysis of single well,profile and plane sedimentary microfacies,it is considered that the rock types of P_(3)wt_(1)^(2)sand group in the study area are mainly conglomerate,glutenite,sandstone and other coarse clastic rocks,which are formed in the braided river delta-lake sedimentary environment,among which the delta front underwater distributary channel,overflow sand and sheet sand microfacies play a leading role.In the evolution process,the vertical evolution is characterized by frequent transformation of underwater distributary channels,interspersed with overflow sand and interdistributary bays microfacies.On the plane,the sediments are mainly transported from the southeast of the study area.In the early stage,the underwater distributary channel microfacies of the braided river delta front subfacies were the main ones.Then,with the decrease of hydrodynamic conditions,the sedimentary range of the underwater distributary channel microfacies gradually decreased,and the overflow sand microfacies and the interdistributary bay microfacies gradually increased.

关 键 词：吉7井区 梧桐沟组 辫状河三角洲 水下分流河道微相 漫流砂微相 席状砂微相 

分 类 号：TE122[石油与天然气工程—油气勘探]