准噶尔盆地柴窝堡凹陷中二叠统地层格架与沉积体系特征  

Characteristics of stratigraphic framework and sedimentary system of Middle Permian in Chaiwopu Sag,Junggar Basin

作　　者：唐小飞 马静辉 张博文 聂礼尚 Tang Xiaofei;Ma Jinghui;Zhang Bowen;Nie Lishang(Xinjiang University,College of Geology and Mining Engineering,Urumqi 830047)

机构地区：[1]新疆大学地质与矿业工程学院,乌鲁木齐830047

出　　处：《地质科学》2023年第3期986-1007,共22页Chinese Journal of Geology(Scientia Geologica Sinica)

基　　金：新疆维吾尔自治区自然科学基金项目(编号:2021D01C041)资助。

摘　　要：柴窝堡凹陷是海西期复杂构造演化形成的具叠合结构的山间坳陷,为准噶尔盆地南部油气勘探开发的热点区域之一。综合利用露头、钻测井、岩心及地震资料,明确柴窝堡凹陷中二叠统层序地层格架、物源、沉积体系构成及展布特征。研究表明,凹陷内可容空间和层序边界受构造升降和古气候变化共同控制,充填地层呈现南厚北薄分布特征;目的层段可划分为4个三级层序SQ1、SQ2、SQ3及SQ4,分别对应乌拉泊组、井井子沟组、芦草沟组及红雁池组;物源由南部时代不同、构造背景相异的伊林黑比尔根山提供;南部斜坡带主要发育冲积扇、扇三角洲沉积相,而在北部凹陷带发育湖泊相;SQ1~SQ4层序沉积时期整体为水退-水进旋回,由早期潮坪-冲积扇沉积环境逐渐演化为晚期冲积扇-扇三角洲-滨浅湖沉积环境,进一步划分为10种亚相和6种微相。相关研究认识可为预测有利油气藏的分布提供一定的理论依据。The Chaiwopu Sag is an inter‑mountain depression with superimposed structure formed by Hercynian complex tectonic evolution.It is one of the hot spots for oil and gas exploration and development in the southern Junggar Basin.The sequence stratigraphic framework,provenance,sedimentary system composition and distribution characteristics of the Middle Permian in Chaiwopu Sag are clarified by comprehensive utilization of outcrop,drilling and logging,core and seismic data.The study shows that the accommodation space and sequence boundary in the sag are controlled by tectonic uplift and paleoclimate change,and the filling strata are characterized by thick in the south and thin in the north.The target interval can be divided into four third‑order sequences SQ1,SQ2,SQ3 and SQ4,corresponding to Wulabo Formation,Jingjingzigou Formation,Lucaogou Formation and Hongyanchi Formation respectively.The provenance is provided by the Ilinhebiergen Mountain with different ages and tectonic backgrounds in the south.The southern slope belt mainly develops alluvial fan and fan delta sedimentary facies,while the northern sag belt develops lacustrine facies.The sedimentary period of SQ1~SQ4 sequence is a regressive‑transgressive cycle,which gradually evolved from the early tidal flat‑alluvial fan sedimentary environment to the late alluvial fan‑fan delta‑shore shallow lake sedimentary environment,and further divided into 10 subfacies and 6 microfacies.Relevant research understanding can provide a theoretical basis for predicting the distribution of favorable oil and gas reservoirs.

关 键 词：柴窝堡凹陷 中二叠统 地层格架 物源分析 沉积体系展布 

分 类 号：P534.46[天文地球—古生物学与地层学] P539.2[天文地球—地质学]