海相辫状河三角洲沉积基准面旋回划分及砂体叠置样式分析:以西江W油田珠江组为例  

Division of Base-level Cycles and Superimposition of Sandbodies in Marine Braided Delta Reservoir: A Case Study of Zhujiang Formation in Xijiang W Oilfield,Pearl River Estuary Basin

作　　者：梁旭 范廷恩 胡光义 陈飞 王海峰 范洪军 LIANG Xu;FAN Tingen;HU Guangyi;CHEN Fei;WANG Haifeng;FAN Hongjun(CNOOC Research Institute,Beijing100028,China)

机构地区：[1]中海油研究总院,北京100028

出　　处：《现代地质》2018年第5期913-923,共11页Geoscience

基　　金：国家科技重大专项"大型油气田及煤层气开发"(2016ZX05025-001)

摘　　要：西江W油田珠江组储层为一套海相辫状河三角洲前缘沉积砂体,内部结构复杂,微相类型多样。运用高分辨率层序地层学原理及测井频谱旋回分析技术,综合岩心、测井等资料,在西江W油田珠江组内部识别出5个长期和18个中期基准面旋回,搭建了精细层序地层格架。通过几何参数的统计和砂体发育规律的总结,在精细层序格架约束下,把辫状河三角洲砂体构型样式划分为孤立型、侧叠型、双向迁移型和堆叠型4种。研究表明基准面旋回变化控制了储层构型叠置样式和演化规律,不同的中期基准面旋回位置发育不同的构型样式,在中期基准面旋回上升早期或下降晚期,砂体以堆叠和侧叠为主,而中期基准面旋回上升晚期或下降早期则以双向迁移型和孤立型为主。构型分析成果有效指导了H11层剩余油的挖潜,并为海上油田三角洲储层构型研究提供了一定思路。Reservoirs in the Zhujiang Formation of the Xijiang W Oilfield are composed of marine braided river delta front deposits.They are characterized by complex internal architecture and contain different microfacies.In this study,highresolution sequence stratigraphic framework is established via comprehensive analysis of core,wireline logs,spectrum and highresolution sequence stratigraphy theory.The results show the presence of five longterm and eighteen mediumterm baselevel cycles within the Zhujiang Formation.The sandbody architecture comprises four types(ie,the isolated,lateral superposition,twoway migrationand amalgamated type)within the Zhujiang Formation stratigraphic framework,as revealed by statistical analysis of geometric parameters and sandbody distributions.The results indicate that longterm baselevel changes play an important role in controlling the sandbody architecture and evolution.During the earlystage rising or latestage falling in the baselevel cycle,the sandbody architecture is dominated by the amalgamated type and lateral superposition type,yet it is dominated by the twoway migration type and isolated type in the opposite case.Analysis of sandbody architecture provides an effective tool for discovering residual oil and assists decisionmaking process in offshore hydrocarbon exploration.

关 键 词：基准面旋回 测井频谱 三角洲前缘 珠江组 构型表征 

分 类 号：TE121.3[石油与天然气工程—油气勘探]