陆相断陷湖盆陡坡带深水重力流沉积类型、特征及模式——以东营凹陷胜坨地区沙四段上亚段为例  

Types, characteristics and sedimentary model of deep-water gravity flow deposition in the steep slope zone of terrestrial faulted lacustrine basin:a case study of the Es4s submember in the Shengtuo area of Dongying depression

作　　者：陈柄屹 林承焰[1,2] 马存飞 任丽华 王军[3] 李志鹏 杜凯 CHEN Bingyi;LIN Chengyan;MA Cunfei;REN Lihua;WANG Jun;LI Zhipeng;DU Kai(School of Geosciences in China University of Petroleum(East China),Qingdao,Shandong,266580;Reservoir Geology Key Laboratory of Shandong Province,Qingdao-,Shandong266580;Shengli Oil Field Exploration and Development Research Institude,DongyingShandong,257099)

机构地区：[1]中国石油大学(华东)地球科学与技术学院,山东青岛266580 [2]山东省油藏地质重点实验室,山东青岛266580 [3]中石化胜利油田勘探开发研究院,山东东营257099

出　　处：《地质学报》2019年第11期2921-2934,共14页Acta Geologica Sinica

基　　金：渤海湾盆地济阳凹陷致密油开发示范工程（编号2017ZX05072）;“十三五”国家科技重大专项（编号2017ZX05009001）资助成果

摘　　要：近年来,与深水沉积物重力流沉积紧密相关的湖相致密油气与深层油气勘探开发日益受到关注并逐渐成为研究热点;断陷湖盆陡坡带由于受"沟梁对应"的地貌特征影响且受控于边界断层,水下重力流沉积扇体发育,也因此成为湖相致密油气与深层油气勘探的重要目标。以东营凹陷胜坨地区沙四段上亚段(分为纯上次亚段和纯下次亚段)为研究对象,以岩芯,地震,测井,录井资料为基础,对陆相断陷湖盆陡坡带深水重力流沉积特征及沉积模式展开研究。研究结果表明:东营凹陷胜坨地区沙四段上亚段深水沉积体系主要发育砂质滑动-滑塌沉积,砂质碎屑流沉积,底流改造沉积,浊流沉积和深湖泥岩沉积五种类型,根据不同岩相组合特征划分出重力流沟道微相,砂质碎屑流舌状体微相,远端朵叶体微相三种微相类型;沙四段上亚段经历了从低位域到湖侵域再到高位域的转换,纯下次亚段在低位域时期经历了胜北断层幕式活动,是形成该时期深水重力流沉积在三级层序整体上呈退积发育,四级层序内部呈进积发育的主要原因,而纯上次亚段高位域时期相对稳定的构造条件使得该时期在三级层序内呈现退积到加积,四级层序内呈现稳定进积的特征;深水重力流搬运过程中由"流动分离作用"引起的"流体性质转换"可以较好地解释平面上重力流沉积类型随搬运距离由近及远的差异性分布以及"远端砂质碎屑流沉积"的形成。In recent years, lacustrine tight oil and gas reservoirs and deep reservoirs closely related with deep-water sediment gravity flow deposits have attracted increasing attention in the field of oil and gas exploration and have become a research hotspot. Controlled by geomorphological features and boundary faults, the steep-slope zone of the faulted lacustrine basin hosts well-developed sedimentary fans caused by subaqueous sediment gravity flow, which has become a major target for tight oil and gas exploration as well as for the deep reservoir. This study selected the Upper Submember of the 4 th Member of the Shahejie Formation(Es4s) in the Shengtuo area, Dongying depression, Bohai Bay basin, East China, as the study object. Based on the core, seismic, logging and mud logging data, sedimentary features and models of the deep-water gravity flow in the steep slope zoon of the terrestrial faulted lacustrian basin has been studied. The results show that sandy slide-slump deposition, sandy debris flow deposition, bottom current reconstructed deposition, turbidity deposition and deep lake mudstone deposition are five main sedimentary types of the deep-water deposition system in the research area. Three types of microfacies of deep-water gravity flow deposition in this area have been identified according to the patterns of different lithofacies combination: gravity flow channel, ligulate sandy-debris and distal lobe. The Es4s deposition experienced a transition from lowstand system tract to transgressive system tract to highstand system tract. The Chunxia sub-submember experienced the episodic faulting activities of the Shengbei fault during the lowstand system tract period, which resulted in that deep-water gravity flow regressively deposited within the 3 rd order sequences and progressively developed within each single 4 th order sequence during the period. The relatively stable tectonic condition makes Chunxia sub-submember featured with retrogradation to aggradation in the 3 rd order sequence and steady progradation i

关 键 词：陆相断陷湖盆 陡坡带 沙四段上亚段 深水重力流 沉积模式 

分 类 号：P61[天文地球—矿床学]