CAJ | 학술논문

延吉盆地是一个后期改造较为强烈的断陷盆地。应用地震、地质、测井资料识别出延吉盆地中存在6个较大的不整合面，它们以角度不整合和超覆不整合2种类型为主。分析认为，燕山Ⅰ、Ⅱ幕运动形成了盆地雏形，燕山Ⅳ幕运动则使盆地回返，此期出现大量高岭石（40％），表明其与大气水淋滤等有关。短暂沉降后（龙井组），燕山运动晚期（Ⅴ幕）发生的又一次大规模以南北挤压为主的构造运动，导致南北两翼抬起幅度巨大，剥蚀厚度超过700 m，盆地中部剥蚀厚度大约为300 m。不整合面是划分三大构造层（前断陷期、断陷期、坳陷期）的依据。其早白垩世铜佛寺组和大砬子组间的整合关系利于油气的生成。不整合面既可改善储集体的渗透性，又是形成油气二次运移的良好通道。初步预测与不整合有关的油气藏（侵蚀残丘、地层超覆不整合、断层坡折）可作为下一步勘探的目标。
연길분지시일개후기개조교위강렬적단함분지。응용지진、지질、측정자료식별출연길분지중존재6개교대적불정합면，타문이각도불정합화초복불정합2충류형위주。분석인위，연산Ⅰ、Ⅱ막운동형성료분지추형，연산Ⅳ막운동칙사분지회반，차기출현대량고령석（40％），표명기여대기수림려등유관。단잠침강후（룡정조），연산운동만기（Ⅴ막）발생적우일차대규모이남북제압위주적구조운동，도치남북량익태기폭도거대，박식후도초과700 m，분지중부박식후도대약위300 m。불정합면시화분삼대구조층（전단함기、단함기、요함기）적의거。기조백성세동불사조화대립자조간적정합관계리우유기적생성。불정합면기가개선저집체적삼투성，우시형성유기이차운이적량호통도。초보예측여불정합유관적유기장（침식잔구、지층초복불정합、단층파절）가작위하일보감탐적목표。
Yanji Basin is a rift basin with strong rework.Six regional unconformities which are mainly angular unconformity and overlap unconformity were identified by seismic,geological and logging data.The prototype of basin was formed by the stage Ⅰ,Ⅱof Yanshanian and the inversion stage of the basin was the stage of Ⅳ of Yanshanian.During this period,the abundant kaolinite (40%)are related to the meteoric water eluviation.After temporary subsidence stage,N S compression during the stage Ⅴof Yanshanian made this area suffer strong denudation.This compression led to a large height of uplift in north and south.The erosion thickness in north and south is more than 700 m while it is about 300 m in the center of the basin.The division of three tectonic sequences is based on the unconformity.The conformity between Tongfosi and Dalazi Formations is preferential for hydrocarbon generation during the Early Cretaceous.It can not only improve the permeability of reservoir but also supply the pathways of petroleum secondary migration.The oil/gas reservoirs(eroding monadnock,overlap unconformity, slope break area of fault)related to the unconformity are the favorable exploration target in future.