塔里木盆地塔河油田T738井区一间房组高精度层序地层格架内沉积微相特征  

Sedimentary Microfacies in a High-precision Sequence Stratigraphic Framework of the Yijianfang Formation in the T738 Well Area of the Tahe Oilfield,Tarim Basin

作　　者：丁梦[1,2] 樊太亮[1,2] 吴俊[1,2] 李煜 李晨晨 吕凯迪 DING Meng;FAN Tailiang;WU Jun;LI Yu;LI Chenchen;LÜKaidi(School of Energy Resources,China University of Geosciences(Beijing),Beijing 100083,China;Key Laboratory of Marine Reservoir Evolution and Hydrocarbon Enrichment Mechanism,Ministry of Education,Beijing 100083,China;Petrochina Changqing Oilfield Company,Qingyang,Gansu 745199,China;Exploration&Development Research Institute of Daqing Oilfield Co.,Ltd.,Daqing,Heilongjiang 163712,China)

机构地区：[1]中国地质大学(北京)能源学院,北京100083 [2]中国地质大学(北京)海相储层演化与油气富集机理教育部重点实验室,北京100083 [3]中石油长庆油田分公司,甘肃庆阳745199 [4]大庆油田有限责任公司勘探开发研究院,黑龙江大庆163712

出　　处：《现代地质》2024年第5期1270-1290,共21页Geoscience

基　　金：国家自然科学基金项目(42102151);中央高校基本科研业务费“新教师基本科研能力提升项目”(2-9-2022-034)。

摘　　要：塔河油田T738井区一间房组地质年代老、埋藏深度大,虽经历了复杂的构造与成岩改造,但仍具有良好的储集性能。目前该井区重点勘探开发主要集中在断裂带发育部位,以断溶体为主要钻探目标。然而,礁滩相勘探潜力巨大,但是对影响碳酸盐岩礁滩相储层发育沉积相认识的不足制约了勘探突破。本研究基于塔河油田T738井区重点井钻测井资料的分析和薄片鉴定工作,建立了T738井区一间房组高精度层序地层格架,总结了一间房组开阔台地内沉积微相常规测井相模式,对沉积微相类型和特征分别进行了划分和描述,分析了四级层序内部礁滩体厚度分布和沉积微相平面展布特征。结果显示,一间房组划分为1个三级层序(Sq1)和3个四级层序(Ssq1、Ssq2和Ssq3),在开阔台地相识别出高-中-低能滩、丘滩间、生物礁(丘)等几种沉积微相。其中,颗粒滩在常规测井判别值域分别对应AC为51~61μs/m,DEN为2.5~2.6 g/cm^(3),CNL为1%~6%,RD为80~3000Ω·m。一间房组Ssq1层序礁滩体规模较小且孤立,仅分布在地势相对高部位,归因于其在三级层序内所处的海侵体系域低部位,水动力条件较弱。Ssq2、Ssq3层序礁滩体位于三级层序内高位体系域,其规模较大、连片性较好,厚度稳定,最大累计厚度达40 m。The Yijianfang Formation in the T738 well area of the Tahe Oilfield is of considerable age and has a significant burial depth.It has undergone complex structural and diagenetic reformation but still exhibits excellent reservoir performance.Currently,key exploration and development targets in the T738 well area is primarily concentrated in the fault zones.The“Fault-karst”trap(reservoir)is the primarily drilling target in this area.In sufficient understanding of the sedimentary facies affecting the development of carbonate shoal reservoirs could significantly restrict exploration and development progress.Based on the analysis of logging data and petrographic studies from key exploration wells in the T738 well area,a high-precision sequence stratigraphic framework for the Tabei area in the Tarim Basin has been established.Additionally,a conventional logging facies model for sedimentary microfacies in the open platform of the Yijianfang Formation has been summarized.We classified and described the types and characteristics of sedimentary microfacies.Additionally,we analyzed the thickness distribution of shoals and the distribution characteristics of sedimentary microfacies within the fourth-order sequence.The study suggests that the Yijianfang Formation can be subdivided into one third-order sequences(Sq1)and three fourth-order sequences(Ssq1,Ssq2,and Ssq3).The sedimentary microfacies of the Yijianfang Formation consist of high-to medium-energy shoals,low-energy shoals,intershoals(mounds),and biological reefs(mounds).The grain shoals correspond to an AC of 51-61μs/m,a DEN of 2.5-2.6 g/cm^(3),a CNL of 1%-6%,and a RD of 80-3000Ω·m within the conventional logging discrimination range.The Ssq1 sequence primarily develops smaller and isolated shoals in relatively higher terrain areas.It is situated in the lower part of the transgressive system tract of the third-order sequence,which experiences relatively weaker hydrodynamic conditions.The Ssq2 and Ssq3 sequences have developed shoals that belong to the highstand s

关 键 词：高精度层序地层划分 层序地层格架 碳酸盐岩沉积微相 常规测井定量相模式 礁滩体平面分布 T738井区 

分 类 号：P618.1[天文地球—矿床学]