深水峡谷复合浊积砂体内隔夹层发育类型与沉积成因——以琼东南盆地中央峡谷为例  

Types and sedimentary genesis of barriers and interlayers in the composite turbidite sand bodies of deep-water canyon:A case study of the Central Canyon in the Qiongdongnan Basin

作　　者：付超 谢玉洪 王晖 宋来明 段锐 苑志旺 徐伟 陈国宁 FU Chao;XIE Yuhong;WANG Hui;SONG Laiming;DUAN Rui;YUAN Zhiwang;XU Wei;CHEN Guoning(CNOOC Research Institute Company Limited,Beijing 100028,China;China National Offshore Oil Corporation,Beijing 100010,China;CNOOC China Limited Shenzhen Company,Shenzhen,Guangdong 518000,China)

机构地区：[1]中海油研究总院有限责任公司 [2]中国海洋石油集团有限公司 [3]中国海洋(中国)有限公司深圳分公司

出　　处：《天然气工业》2023年第5期23-33,共11页Natural Gas Industry

基　　金：中国博士后科学基金项目“深水峡谷沉积物输送体系定量分析与浊积砂岩储层结构响应机制——以琼东南盆地中央峡谷陵水段为例”(编号:2022M723532)。

摘　　要：深水油气是目前全球油气勘探的热点和难点,其中深水峡谷浊积水道内部复杂流动过程导致储层结构难以表征,隔夹层判识难度大,复杂的储层空间展布规律制约了深水油气资源的勘探开发。为此,以琼东南盆地中央峡谷为例,基于三维地震与岩心数据,利用地震沉积学方法开展了复合水道尺度隔夹层的识别与刻画,结合浊积充填过程划分了隔夹层类型,分析了其成因和控制因素,并基于沉积物输送体系参数的定量分析,建立了深水隔夹层发育模式。研究结果表明:①隔夹层按照沉积成因可划分为侧(加)积浊积水道成因泥岩夹层(A型)、细粒浊积水道成因泥岩夹层(B型)、半远洋深水沉积成因隔层(C型)、钙质物性夹层(D型)4种类型。②隔夹层按充填期次可划分为峡谷初始形成阶段—沉积物供给充足条件隔夹层序列(A型+C型)和(C型+B型)、峡谷初始形成阶段—沉积物供给不足条件隔夹层序列(B型+C型)、峡谷稳定发育/后期改造阶段—沉积物供给充足条件隔夹层序列(A型+D型)、峡谷稳定发育/后期改造阶段—沉积物供给不足条件隔夹层序列(D型)4种组合。③隔夹层发育的类型与组合序列受控于峡谷中沉积物输送量与地形坡度变化,峡谷初始形成阶段,浊积体空间充足,薄隔夹层发育受控于沉积物输送量,厚隔夹层发育受控于地形变化;峡谷稳定发育/后期改造阶段,浊积体存在叠置发育与溢岸现象,沉积物供给主控隔夹层厚度,地形变化为次要因素。结论认为,隔夹层发育模式可用于同类型沉积背景下储层结构样式的刻画与预测,为深水油气的勘探开发提供了技术支撑。Deep oil and gas is currently the hot spot and difficulty of global oil and gas exploration,and the complex flow process inside the turbidite channels of deep-water canyons makes it difficult to characterize reservoir structures,identify barriers and interbeds and clarify the spatial distribution laws of reservoirs,which restricts the development of deep oil and gas.Taking the Central Canyon of the Qiongdongnan Basin as an example,this paper identifies and characterizes the barriers and interbeds of composite channel scale by means of seismic sedimentology,based on three-dimensional seismic and core data.Then,based on the turbidite filling process,barriers and interbeds are classified,and their genesis and control factors are analyzed.Finally,a development model of deep-water barriers and interbeds is established based on the quantitative analysis of sediment routing system parameters.And the following research results are obtained.First,based on sedimentary genesis,barriers and interbeds are classified into four types,namely mudstone interbeds of lateral aggradational turbidite channel genesis(type A),mudstone interbeds of fine-grained turbidite channel genesis(type B),barriers of hemipelagic deep-water sediment genesis(type C),and calcareous physical interbeds(type D).Second,based on the filling stage,barriers and interlayers are divided into four combination sequences,i.e.,the initial canyon formation stage with strong sediment supply conditions(type A+type C and type B+type C),the initial canyon formation stage with weak sediment supply conditions(type B+type C),the stable canyon development/late reworking stage with strong sediment supply conditions(types A+type D),and the stable canyon development/late reworking stage with weak sediment supply conditions(type D).Third,the development types and combination s equences of barriers and interlayers are controlled by the change of sediment transportation volume and topographic slope in the canyon.In the initial canyon formation stage,there is sufficient space for

关 键 词：深水峡谷 隔夹层 浊积水道 沉积物输送系统 琼东南盆地 

分 类 号：P618.13[天文地球—矿床学]