渤海海域垦东凸起北部沙河街组古构造-古地貌控制下的层序-沉积体系发育模式  

Sequence stratigraphy and sedimentary systems development model under the control of syn-depositional faults and paleo-geomorphology of the Paleogene Shahejie formation in the northern Kendong uplift in the Bohai Sea area

作　　者：武群虎[1] 周红科[1] 薛琦莉 于世娜[1] 刘景彦[2] 郭厚根 彭定亮 詹桐 程雨涵 WU Qunhu;ZHOU Hongke;XUE Qili;YU Shina;LIU Jingyan;GUO Hougen;PENGDingliang;ZHAN Tong;CHENG Yuhan(Sinopec Shengli Oilfield Company Limited,Marine Oil Extraction Factory,Dongying 257237,China;College of Energy,China University of Geosciences(Beijing),Beijing 100083,China;National Key Laboratory of Uranium Resources Exploration-Mining and Nuclear Remote Sensing,Beijing 100029,China;Beijing Research Institute of Uranium Geology,Beijing 100029,China;CNNC Key Laboratory of Uranium Resources Exploration and Evaluation Technology,Beijing 100029,China)

机构地区：[1]中国石油化工股份有限公司胜利油田分公司海洋采油厂,山东东营257237 [2]中国地质大学(北京)能源学院,北京100083 [3]铀资源探采与核遥感全国重点实验室,北京100029 [4]核工业北京地质研究院,北京100029 [5]中核集团铀资源勘查与评价技术重点实验室,北京100029

出　　处：《世界核地质科学》2024年第5期909-918,共10页World Nuclear Geoscience

基　　金：核技术研发科研项目(编号:地HTLM2101)资助。

摘　　要：垦东凸起位于郯庐断裂带的渤海亚段莱西断层的西侧,构造活动复杂,埋藏浅,粗碎屑砂体发育,具有良好的成矿、成藏条件,是渤海海域重要的油气资源勘探区域。本研究聚焦于垦东凸起北段古近系沙河街组,在高精度层序地层分析的基础上,探讨同沉积构造活动制约下的古隆起-古地貌源-汇砂质沉积体系分布规律,并建立沉积模式,为有利储集相带预测提供重要参考。研究表明,本区沙河街组包括SQ_Es3和SQ_Es1两个三级层序,SQ_Es3低位(LST)和水进体系域(TST)的四级层序Ssq-1、Ssq-2和Ssq-3发育扇三角洲、近岸水下扇及深湖沉积,表现为快速充填和近源堆积特征;高位域(HST)的Ssq-4主要为湖泊-三角洲体系。SQ_Es1层序LST不发育,主要为TST和HST,滨浅湖碎屑滩坝和碳酸盐岩浅滩为其主体沉积相。古近纪同沉积断裂活动控制陡坡下降盘的快速沉降和近源扇体的发育,沿断裂带方向,断层末端的调节作用促成沟-谷-渠通道的形成,控制远源搬运,构建从古隆起-斜坡带-洼陷区的源-渠-汇体系。SQ_Es3凸起边缘近源快速充填的近岸水下扇、扇三角洲前缘水下河道和河口坝砂体发育,是重要的储集目标;SQ_Es1凸起边缘滨浅湖滩坝也具有重要的油气勘探潜力。Kendong Uplift is located on the western side of Laixi fault in the Bohai Sea segment of the Tanlu Fault Zone.It is charactered with complex tectonic evolution,diverse sedimentary fillings,shallow buried depth and sandrich deposits,which is believed with good condition for oil/gas accumulation or sandstone-type uranium deposits and an important exploration area in Bohai Sea.This study focused on the sedimentary development under the high resolution sequence stratigraphy framework of Paleogene Shahejie Formation in the northern section of Kendong uplift and has set up the development and distribution model of source-sink sandy sedimentary system on the background of paleouplift-paleogeomorphology controlled by the syn-depositional fault activities,which will provide an important reference for favorable reservoir facies zones prediction.The study identified two 3rd order sequences(SQ_Es3 and SQ_Es1)and four 4th sequences of Ssq-1,Ssq-2,Ssq-3 and Ssq-4.Ssq-1,Ssq-2,Ssq-3 deposited in the low stand system tract and transgressive tract and mainly developed fan delta,near shore subfan,and deep lake,showing rapid filling and proximal accumulation characteristics.Ssq-4 formed in the high stand system tract and mainly developed lacustrine delta.SQ_Es1 is lack of low stand system tract,mainly developed transgressive tract and high stand system tract,with the characteristic of shallow lake clastic bar and carbonate shoals.The syn-sedimentary fault activities controlled the rapid subsidence and the development of the proximal fan deposits in the steep and slope area.Along the direction of the fault zone,the regulation of the fault end promoted the formation of the valley or channel and controlled the remote source transportation and the construction of the source-channel-sink system from the paleouplift-slope zone to deep depression area.Fan delta front sandbodies developed on the edge of paleouplift of SQ_Es3 and lacustrine bar sandbodies of SQ_Es1 are the favorable reservoir targets for oil-gas exploration.

关 键 词：渤海湾盆地 垦东凸起 沙河街组 层序和沉积体系 古构造-古地貌 

分 类 号：P618.130.2[天文地球—矿床学] P542.3[天文地球—地质学]