惠民凹陷大芦家地区馆陶组三段沉积微相类型及空间展布

针对惠民凹陷大芦家地区各断块地层单元划分不一致,沉积相认识存在分歧等问题,依据旋回级次、旋回性质等,将馆陶组三段划分出2个四级旋回、4个五级旋回、16个六级旋回;并以岩芯及室内分析资料、测井资料等为主要依据,综合分析岩石类型、粒度及结构特征、垂向粒序变化、层理构造类型及自然电位曲线形态等。结果表明：惠民凹陷大芦家地区馆陶组三段主要发育冲积扇及辫状河;冲积扇主要发育辫流砂岛、辫流沟道、辫流带、漫流席状砂、远端砂丘等微相;辫状河主要发育心滩,辫状河道充填,天然堤、漫滩和道间洼地沉积,泛滥平原沉积,废弃河道等微相;2个四级旋回的沉积相类型及空间展布特征相似;第Ⅰ五级旋回在研究区中偏西部属冲积扇沉积,...

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Bibliographic Details
Published in地球科学与环境学报 Vol. 37; no. 1; pp. 66 - 75
Main Author 国景星 郭卫萍 刘斌楠 曹铮
Format Journal Article
LanguageChinese
Published 中国石油大学 华东 地球科学与技术学院,山东青岛,266580 2015
Subjects
冲积扇
惠民凹陷
旋回
沉积微相
粒度概率累积曲线
自然电位
辫状河
馆陶组
辫状河
自然电位
spontaneous potential
惠民凹陷
馆陶组
braided river
冲积扇
alluvial fan
cycle
sedimentary microfacies
Guantao Formation
Huimin sag
粒度概率累积曲线
cumulative probability curve of particle size
沉积微相
旋回
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ISSN1672-6561

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Summary:针对惠民凹陷大芦家地区各断块地层单元划分不一致,沉积相认识存在分歧等问题,依据旋回级次、旋回性质等,将馆陶组三段划分出2个四级旋回、4个五级旋回、16个六级旋回;并以岩芯及室内分析资料、测井资料等为主要依据,综合分析岩石类型、粒度及结构特征、垂向粒序变化、层理构造类型及自然电位曲线形态等。结果表明：惠民凹陷大芦家地区馆陶组三段主要发育冲积扇及辫状河;冲积扇主要发育辫流砂岛、辫流沟道、辫流带、漫流席状砂、远端砂丘等微相;辫状河主要发育心滩,辫状河道充填,天然堤、漫滩和道间洼地沉积,泛滥平原沉积,废弃河道等微相;2个四级旋回的沉积相类型及空间展布特征相似;第Ⅰ五级旋回在研究区中偏西部属冲积扇沉积,主要发育辫流砂岛、辫流沟道、辫流带微相,在东部属扇前平原沉积;第Ⅱ五级旋回早期以辫状河沉积为主,河道规模较大,仅在第Ⅱ1六级旋回的东北部位见冲积扇的辫流砂岛及辫流沟道微相;第Ⅱ五级旋回中期属辫状河沉积,河道规模减小,2个河道群自NW向SE方向流动;第Ⅱ五级旋回晚期河道规模更小,逐渐向曲流河沉积过渡。
Bibliography:On the issues of the inconsistent of stratigraphic division of blocks in the third member of Guantao Formation in Dalujia area of Huimin sag and the differences of understanding on sedimentary facies,according to the order and characteristics of cycle,the third member of Guantao Formation was divided into two forth-order cycles,five fifth-order cycles and sixteen sixth-order cycles;according to the core data,laboratory analysis,log information,etc.,rock type,particle size and textural characteristics,change of vertical particle size,type of bedding structure and shape of spontaneous potential curve were comprehensively analyzed.The results show that alluvial fan and braided river develop in the third member of Guantao Formation in Dalujia area of Huimin sag;for alluvial fan,the main microfacies types include braided stream sand island,braided stream channel,braided stream belt,overland flow sheet sand,distal sand dune,and so on;for braided river,the main microfacies include river island,braided channel fillin
ISSN:1672-6561