CAJ | 학술논문

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。
침대혜민요함대호가지구각단괴지층단원화분불일치,침적상인식존재분기등문제,의거선회급차、선회성질등,장관도조삼단화분출2개사급선회、4개오급선회、16개륙급선회；병이암심급실내분석자료、측정자료등위주요의거,종합분석암석류형、립도급결구특정、수향립서변화、층리구조류형급자연전위곡선형태등。결과표명：혜민요함대호가지구관도조삼단주요발육충적선급변상하；충적선주요발육변류사도、변류구도、변류대、만류석상사、원단사구등미상；변상하주요발육심탄,변상하도충전,천연제、만탄화도간와지침적,범람평원침적,폐기하도등미상；2개사급선회적침적상류형급공간전포특정상사；제Ⅰ오급선회재연구구중편서부속충적선침적,주요발육변류사도、변류구도、변류대미상,재동부속선전평원침적；제Ⅱ오급선회조기이변상하침적위주,하도규모교대,부재제Ⅱ1륙급선회적동북부위견충적선적변류사도급변류구도미상；제Ⅱ오급선회중기속변상하침적,하도규모감소,2개하도군자 NW향 SE 방향류동；제Ⅱ오급선회만기하도규모경소,축점향곡류하침적과도。
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 filling,floodplain sedimentary,abandoned channel,and the sedimentary of natural levee,flood plain and interchannel mud,and so on;the sedimentary facies types and space distribution of two forth-order cycles are similar;the fifth-order cycle I in the middle-westward of the study area belongs to alluvial fan sedimentary,the microfacies including braided stream sand island,braided stream channel and braided stream belt develop,and the fifth-order cycle I in the eastern part belongs to fan front plain sedimentary;in the early of the fifth-order cycle Ⅱ,braided river sedimentary mainly develops,river channel is large,and the microfacies including braided stream sand island and braided stream channel develop only in the northeastern part of the sixth-order cycle Ⅱ1;in the middle of the fifth-order cycle Ⅱ,braided river develops,and river channel decreases,two river channel groups flow from NW to SE;in the late of the fifth-order cycle Ⅱ, river channel decreases further,and gradually transforms into meandering river sedimentary.