断陷湖盆斜坡构造类型及特征——以歧口凹陷为例  

Slope structure feature and category in faulted basin-A case study on Qikou sag Bohai Bay basin

作　　者：肖敦清[1] 卢异[1] 付立新[1] 成洪文[1] 张志攀[1] 

机构地区：[1]中国石油大港油田分公司勘探开发研究院,天津300280

出　　处：《石油地质与工程》2013年第1期1-6,137,共6页Petroleum Geology and Engineering

基　　金：中国石油天然气股份公司重大专项(2008E-0601)

摘　　要：斜坡构造紧靠生油气凹陷,处于油气运移的指向区,是断陷湖盆油气规模聚集的有利构造单元,也是继"复式油气聚集带"之后各油田继续实现勘探突破与规模增储的有利勘探区带。歧口凹陷作为典型而独特的断陷湖盆,在古近纪时期,受基底差异沉降以及继承性大断裂活动两大主控因素共同影响,发育有5大斜坡区,划分为阶状断裂斜坡、多阶挠曲斜坡、简单斜坡、及旋转掀斜斜坡4种类型,5大斜坡环歧口凹陷中心呈规律性展布。Slope structure,one of the most important tectonic elements in faulted basin,lying between high hydrocarbon source depression.As the main sedimentary zone in around the basin,the slope structure produces and holds most of the large-scale lithologic trap,which is the favorable hydrocarbon accumulated tectonic element and the main target for lithologic reservoir exploration and the practical replacement of composite petroleum accumulation belt.In Paleogene,Qikou sag,a typical Paleogene faulted basin,controlled by the differential settlement in basement and inherited movement of basement faults,developed five slope tectonic elements which belong to four different slope categories.They were step-style faulted slope,step-style flexure slope,normal slope and rotate-tilted slope.Five slope structure regularly located around the center of Qikou sag.

关 键 词：歧口凹陷 挠曲斜坡 断裂斜坡 旋转掀斜斜坡 

分 类 号：TE111.2[石油与天然气工程—油气勘探]