吉木萨尔凹陷二叠系芦草沟组层序地层划分及演化特征  

Sequence stratigraphy division and evolutionary features of Permian Lucaogou Formation in Jimsar Sag

作　　者：张文文 韩长城 田继军 张治恒 张楠 李正强 ZHANG Wenwen;HAN Changcheng;TIAN Jijun;ZHANG Zhiheng;ZHANG Nan;LI Zhengqiang(Geology and Mining Engineering academy,Xinjiang University,Urumqi 830046,China)

机构地区：[1]新疆大学地质与矿业工程学院,乌鲁木齐830046

出　　处：《岩性油气藏》2021年第5期45-58,共14页Lithologic Reservoirs

基　　金：国家自然科学基金项目“新疆北部侏罗纪巨厚煤层的煤岩特征与煤相演替”(编号:41662010);新疆维吾尔自治区自然科学基金“塔河油田下奥陶统内幕区多源成岩流体特征及成储机理”(编号:2020D01C037);新疆维吾尔自治区高校科研计划“塔里木盆地深层—超深层碳酸盐岩构造-流体耦合控储机理”(编号:XJEDU2019Y011)联合资助。

摘　　要：为明确吉木萨尔凹陷二叠系芦草沟组层序地层特征及其演化规律,开展了大量的钻井岩心分析、测井分析和地震资料解释,并对其沉积微相展布特征进行了综合研究。结果表明:①吉木萨尔凹陷芦草沟组自下而上可分为SQ_(1)和SQ_(2)等2个三级层序,其中SQ_(1)又分为低位、湖侵、高位体系域,SQ_(2)可分为湖侵、高位体系域,“甜点体”储层形成于高位体系域;②吉木萨尔凹陷芦草沟组为一套三角洲—咸化湖泊沉积体系,可识别出砂坝、前三角洲泥、滩砂、浅湖泥、混合坪、云坪、半深湖泥以及浊流等8种沉积微相;③吉木萨尔凹陷芦草沟组沉积期,持续存在陆源碎屑和碳酸盐岩的混合沉积,早期陆源碎屑三角洲沉积体系更发育,晚期咸化湖泊沉积体系更发育;④气候、物源供给强度和湖平面的周期性升降控制了吉木萨尔凹陷芦草沟组的层序发育和沉积演化。该研究成果对吉木萨尔凹陷二叠系芦草沟组的油气勘探具有指导意义。To clarify the sequence stratigraphic characteristics and evolution of the Permian Lucaogou Formation in Jimsar Sag,many drillings core analysis,well logging analysis and seismic data interpretation were carried out.The distribution characteristics of the sedimentary microfacies of the Lucaogou Formation were comprehensively studied.The results show that:(1)The Lucaogou Formation of the Jimsar Sag,from bottom to top,can be divi-ded into two third-order sequences(SQ_(1) and SQ_(2)),and SQ_(1) can be divided into lowstand(LST),transgressive(TST)and highstand system tracts(HST),SQ_(2) can be divided into TST,HST."sweet spots"is formed in HST.(2)The Lucaogou Formation is a set of delta-salined lake sedimentary system,which can be identified 8 sedimentary microfacies(sand dam,pre-delta mud,beach sand,shallow lake mud,mixed flat,dolomitic flat,semi-deep lake mud and turbidite deposit).(3)During the depositional period of the Lucaogou Formation in Jimsar Sag,mixed deposition of terrigenous clastics and carbonate rocks continued to exist.The terrigenous clastic delta sedimentary system was more developed in the early stage,and the saline lake sedimentary system was more deve-loped in the late stage.(4)Climate,intensity of material supply and periodic rise and fall of the lake level control the stratigraphic development and sedimentary evolution of Lucaogou Formation in Jimsar Sag.The research results have guiding significance for the petroleum exploration of Permian Lucaogou Formation in Jimsar Sag.

关 键 词：层序地层 沉积演化 沉积微相 咸化湖 芦草沟组 二叠系 吉木萨尔凹陷 

分 类 号：TE121.3[石油与天然气工程—油气勘探]