CAJ | 학술논문

以往鄂尔多斯盆地中生界油气勘探主要强调在烃源岩范围之内寻找主砂带，很少注意构造对油藏的控制作用，但近年来，在鄂尔多斯盆地内部却发现了不少受低幅度隆起构造控制的油气藏。利用最新地震勘探与钻井资料，在大量野外露头调查、钻井岩心观察及地震剖面解释的基础上，对鄂尔多斯盆地中生界低幅度构造空间分布、形成机制及其与油气成藏的关系进行了深入分析。研究结果表明：（1）鄂尔多斯盆地天环坳陷东、西斜坡均存在大量有规律分布的低幅度隆起构造，其中延长组内沿近东西向、成排展布的大型低幅度鼻状隆起构造主要受基底古突起控制，而延长组与延安组内的局部隆起构造主要受断层相关褶皱、差异压实及复合成因等多重作用控制；（2）低幅度构造对天环坳陷东、西斜坡中生界油气成藏均有影响，其中大型低幅度鼻状隆起构造为油气大面积聚集提供了构造背景，因而其附近的局部隆起构造及非构造圈闭均是油气聚集成藏的有利部位。
이왕악이다사분지중생계유기감탐주요강조재경원암범위지내심조주사대，흔소주의구조대유장적공제작용，단근년래，재악이다사분지내부각발현료불소수저폭도륭기구조공제적유기장。이용최신지진감탐여찬정자료，재대량야외로두조사、찬정암심관찰급지진부면해석적기출상，대악이다사분지중생계저폭도구조공간분포、형성궤제급기여유기성장적관계진행료심입분석。연구결과표명：（1）악이다사분지천배요함동、서사파균존재대량유규률분포적저폭도륭기구조，기중연장조내연근동서향、성배전포적대형저폭도비상륭기구조주요수기저고돌기공제，이연장조여연안조내적국부륭기구조주요수단층상관습추、차이압실급복합성인등다중작용공제；（2）저폭도구조대천배요함동、서사파중생계유기성장균유영향，기중대형저폭도비상륭기구조위유기대면적취집제공료구조배경，인이기부근적국부륭기구조급비구조권폐균시유기취집성장적유리부위。
The oil and gas exploration of Ordos Basin in Mesozoic was mainly in the range of hydrocarbon source rocks for the main sandy belt,and little attention was paid to the control of the construct reservoirs in the past.But in recent years,within the Ordos Basin,it was found that a considerable number of oil and gas reser-voirs were controlled by the low amplitude uplifted structure.In this paper,on the basis of the latest seismic exploration and drilling data,outcrop survey,observation of drilling cores and seismic profiles interpreted,we conduct in-depth analysis on the distribution of low amplitude structural space,formation mechanism and hydro-carbon accumulation relationship in Mesozoic of the Ordos Basin.The results show that:(1 )In the east and west slopes of Tianhuan Depression,Ordos Basin,there are a large number of low-amplitude uplift structures with regular distribution,in which the large-scale distribution of low amplitude nose-shaped uplift structure near-ly east-west along the rows is mainly controlled by paleo-protuberance in Yanchang Formation,and the local up-lift structures of Yanchang and Yan'an formations are mainly controlled by the fault-related fold,differential compaction and composite geneses;(2 )The low amplitude structures affects both east and west slopes of the Mesozoic oil and gas accumulation in the Tianhuan Depression,in which large low-amplitude nose-shaped uplift structure provides a large area of the oil and gas gathering tectonic setting,and near the locals,the uplift struc-ture and non-structural traps are favorable parts of the oil and gas accumulation.The article also pointed out that seismic exploration and basic geological research should be vigorously strengthened.