摘要
蠡县斜坡高阳地区沙一下亚段油气资源丰富,是近年来主要的勘探层系。为进一步落实沙一下亚段沉积相展布特征,明确下一步勘探开发方向,综合利用岩心、测井及三维地震等资料,对沉积相标志、类型、分布及模式进行分析。结果表明:①蠡县斜坡高阳地区沙一下亚段广泛发育浅水三角洲前缘亚相,主要存在细砂岩、粉砂岩、泥岩3类岩性,可划分出9种岩相类型;②沙一下亚段测井相类型多样,主要发育箱形、钟形、指形、漏斗形及平直形5种;③在地震剖面上,沙一下亚段表现为小型叠瓦状前积和隐性前积2种反射特征;④高阳地区沙一下亚段主要发育水下分流河道、河口坝、席状砂、水下分流间湾4种微相,沉积微相特征及演化规律与湖平面升降密切相关,不同时期沉积微相分布与演化特征各异。在上述沉积特征研究基础上,建立湖盆萎缩期和湖盆扩张期2种浅水三角洲前缘沉积模式,可为类似区域油气勘探提供地质依据。
The lower first member of Shahejie Formation(Es1 X)in Gaoyang area,Lixian Slope,which contain sizable hydrocarbon resources,was the main oil layers in recent years.In order to make clear the distribution characteristics of sedimentary facies and define the direction of the further exploration and development,cores,well logging and seismic data were used to study the sedimentary facies symbols,types,distribution and models.The results show that:(1)Shallow water delta front widely developed in Es1 X in Gaoyang area of Lixian Slope,the sand bodies were mainly composed of fine sandstone,siltstone and mudstone,and nine lithofacies types can be identified.(2)The logging facies in the study area can be divided into five types,including box-shaped,bellshaped,finger-shaped,funnel-shaped and flat-shaped.(3)On the seismic profiles,the Es1 X shows small scale imbricated progradation reflection and sub-clinoformal seismic reflection.(4)The shallow water delta front in Gaoyang area mainly developed four kinds of sedimentary microfacies,which are underwater distributary channel,mouth bar,sheet sand,underwater diversion bay.The sedimentary microfacies features and evolution law of Es1 X are closely related with the lake-level fluctuation,and the distribution and evolution of sedimentary microfacies at different period are different.According to the sedimentary characteristics above,the development models of shallow⁃water delta front of lacustrine basin in atrophy period and spreading period were established,which can provide geological basis for hydrocarbon exploration in similar areas.
作者
薛辉
韩春元
肖博雅
王芳
李玲
XUE Hui;HAN Chunyuan;XIAO Boya;WANG Fang;LI Ling(Research Institute of Exploration and Development,PetroChina Huabei Oilfield Company,Renqiu 062550,Hebei,China)
出处
《岩性油气藏》
CSCD
北大核心
2020年第4期69-80,共12页
Lithologic Reservoirs
基金
中国石油天然气股份公司重大科技专项“重点区带沉积特征再认识与储层预测研究”(编号:2017E-1504-3)资助。
关键词
浅水三角洲前缘
沉积特征
发育模式
沙河街组
蠡县斜坡
shallow water delta front
sedimentary characteristics
development model
Shahejie Formation
Lixian Slope
