摘要
选取鄂尔多斯盆地庆城油田Z211井区为解剖区,应用研究区丰富的岩心、测井、地震及生产动态资料,在精细等时地层格架的基础上,采用“层次分析、多维互动、直井与水平井结合”的构型解剖方法,表征长6油组湖底扇不同级次的砂体构型。结果表明:湖底扇构型可细分为单一湖底扇、复合朵叶体组合、复合朵叶体、单一朵叶体及其内部增生体共5个级次;单一湖底扇由多期复合朵叶体组合垂向叠置而成,复合朵叶体组合由多期复合朵叶体侧向组合而成,复合朵叶体由具有统一供给水道的多个单一朵叶体补偿叠置而成;单一朵叶体叠置样式和定量规模与短期基准面旋回有关;基准面低位时期,单一朵叶体连片补偿叠置沉积,规模更大,形态呈饱满的“纺锤状”;基准面高位时期,单一朵叶体孤立式沉积或部分补偿叠置沉积,规模更小,形态呈欠饱满的“窄带状”;基于构型解剖结果,建立指状朵叶与扇状朵叶2种湖底扇三维构型模式。研究成果对丰富湖相重力流沉积构型理论及油田下一步高效开发具有重要意义。
A detailed case study of the Z211 area in the Qingcheng Oilfield,Ordos Basin,was conducted to analyze the depositional architecture of the sub-lacustrine fan in the Chang_6 member.Utilizing extensive core data,well logs,seismic interpretation,and production dynamics,the study employs a fine-scale isochronous stratigraphic framework combined with the methods of hierarchical analysis,multi-dimensional interaction,vertical-horizontal well integration to characterize the sub-lacustrine fan at different hierarchical levels.The results indicate that the architecture of sub-lacustrine fan can be subdivided into five levels:individual sub-lacustrine fan,lobe complex set,lobe complex,individual lobe,and accretion.The individual sub-lacustrine fan is formed by the vertical stacking of multiple lobe complex sets,each of which consists of lobe complex deposits.A lobe complex comprises multiple individual lobes sharing a unified supply channel and follows a compensational superimposition pattern.The superimposition patterns and quantitative scales of individual lobes are controlled by short-term base-level cycles.During low base-level periods,individual lobes exhibit continuous compensational stacking,forming larger-scale deposit with a well-developed"fusiform"shape.In high base-level periods,individual lobes are either isolated or partially compensationally stacked,resulting in smaller-scale deposits with a“narrow belt”shape.Based on architecture characterization,two three-dimensional depositional models of sub-lacustrine fans were established,which included finger-shaped lobe sub-lacustrine fan and fan-shaped lobe sub-lacustrine fan.This findings of this study contribute significantly to the understanding of lacustrine gravity flow sedimentary architecture and provide valuable insights for the efficient development of oilfields.
作者
刘瑞璟
岳大力
白斌
王武荣
侯秀林
赖桢媛
董若婧
李伟
李桢
吴胜和
LIU Ruijing;YUE Dali;BAI Bin;WANG Wurong;HOU Xiulin;LAI Zhenyuan;DONG Ruojing;LI Wei;LI Zhen;WU Shenghe(State Key Laboratory of Petroleum Resources and Engineering,China University of Petroleum(Beijing),Beijing 102249,China;College of Geosciences,China University of Petroleum(Beijing),Beijing 102249,China;Research Institute of Petroleum Exploration and Development,PetroChina,Beijing 100083,China;Research Institute of Exploration and Development,PetroChina Changqing Oilfield Company,Xi'an 710018,China)
出处
《中国石油大学学报(自然科学版)》
北大核心
2025年第2期42-55,共14页
Journal of China University of Petroleum(Edition of Natural Science)
基金
中国石油天然气集团有限公司-中国石油大学(北京)战略合作科技专项项目(ZLZX2020-02)
国家自然科学基金项目(42272186)
国家自然科学基金青年科学基金项目(42302128)。
关键词
湖底扇
单一朵叶体
砂体构型
鄂尔多斯盆地
庆城油田
长6油组
sub-lacustrine fan
individual lobe
sand architecture
Ordos Basin
Qingcheng Oilfield
Chang_6 member
