鄂尔多斯盆地延长油田永857井区长6油层组沉积特征研究  

Sedimentary Characterization of Chang 6 Formation Group in Yong 857 Area of Yanchang Oilfield in Ordos Basin

作　　者：何强 何江 HE Qiang;HE Jiang(State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Chengdu 610500,China;School of Geoscience and Technology,Southwest Petroleum University,Chengdu 610500,China)

机构地区：[1]油气藏地质及开发工程国家重点实验室,成都610500 [2]西南石油大学地球科学与技术学院,成都610500

出　　处：《西安文理学院学报(自然科学版)》2025年第1期45-50,共6页Journal of Xi’an University(Natural Science Edition)

基　　金：陕西省自然科学基金项目“页岩油储层微-纳米孔喉系统量化表征及对可动流体赋存状态控制机理研究”(2022JQ-290)

摘　　要：为有效提升研究区长6油层组沉积特征认识程度,研究综合应用钻井、测井、录井和岩心等资料,通过地层精细对比、相标志识别和分析、单井相解剖、平面相分析等手段,首次对研究区长6油层组沉积特征进行精细刻画,系统揭示其沉积微相类型和砂体分布规律,明确有利储集相带,为后续勘探开发提供重要指导.研究表明:(1)研究区长6沉积相为三角洲前缘沉积,物源主要来自北东向;(2)长6沉积微相分别为水下分流河道、水下天然堤、水下分流间湾和河口坝,其中河口坝微相仅局部可见;(3)研究区长6时期发育3条主要水下分流河道,河道宽阔,砂体发育且连片分布,有利于油气聚集,水下分流河道是后期勘探开发部署最有利相带.In order to improve the understanding of the sedimentary characteristics of the Chang 6 formation group,this study comprehensively applies the data from drilling,logging,recording and coring,etc.Through the means of stratigraphic fine delineation,phase marker identification and comparison,single-well phase dissection,and planar phase analysis,etc.,the sedimentary characteristics of the Chang 6 formation group in the study area are meticulously characterized for the first time.The types of the sedimentary microphases and the distribution patterns of sands are systematically revealed,and favorable reservoir phase zones are clarified,which will provide an important reference for the subsequent exploration development.The study shows:①the Chang 6 formation in the study area is mainly deposited in the front edge of the delta,and the material source is mainly from the north-east direction;②the sedimentary microphases of the Chang 6 formation are mainly submerged diversion channels,submerged diversion bays,submerged natural dykes and estuarine dams microphases,of which the estuarine dams microphases are only locally visible;③Three major submerged diversion channels were developed during the period of the study area's Chang 6,and they are wide,with well-developed sands that are continuously distributed,which is favorable for the aggregation of hydrocarbon.The underwater diversion channels are the main favorable zones for following exploration and development deployment.

关 键 词：永857井区 长6油层组 沉积特征 

分 类 号：P618.13[天文地球—矿床学]