东北石油大学学报2018，Vol.42Issue(6)：52-61,前插4-前插5,12.DOI:10.3969/j.issn.2095-4107.2018.06.006
涠西南凹陷流沙港组二段至一段构造特征及其对沉积的控制作用
Structure characteristics of Weixi'nan sag during Liushagang-2 member to Liushagang-1 member depositional period and its control on sedimentary fill
摘要
Abstract
Through comprehensive analyses of fault system and basin structure framework, this paper studied structural characteristics of the Weixi''nan sag during Liushangang-2 member to Liushagang-1member depositional period.And based on the study of sedimentary fill characteristics, this paper tried to unravel the control of structural characteristics on sedimentary fill in Weixi''nan sag.The result shows that during Liushangang-2member to Liushagang-1member depositional period Weixi''nan sag was dominantly controlled by NE-NEE trending boundary fault, named No.1fault, whereas large, relative continuous No.2fault that was NEE trending became en echelon faults arranged by many small, discontinuous EW trending secondary faults.Meanwhile, the number of secondary faults decreased significantly, and fault directions were mainly transferred from NE and NE-NEE trending into EW trending, which was closely related to the transition of subduction direction of Pacific Ocean from NNW trending into NWW trending, the transition of collision between India-Australia plate and Eurasian plate from soft collision to hard collision.During Liushagang-2member to Liushagang-1member depositional period, the structure framework of Weixi''nan sag was NE trending half-graben basin that faulted in the northwest part and overlapped in the southeast part.The sedimentary water depth and areas of Liushagang-2 member depositional period were deeper and wider than Liushagang-1member depositional period, and the transition of No.2fault formed many EW trending structural transfer zones within sag, which was helpful to the sedimentary transportation.The sedimentary characteristics of study area were corresponding to the basin structure characteristics.From Liushagang-2 member to Liushagang-1 member depositional period the areas of semi-deep lacustrine facies sediment decreased obviously, while the areas of fan sediment increased significantly, and structural transfer zones formed by the transition of No.2fault played a great role in controlling the distributions of sub-lacustrine fan within sag.The study results reveals the interaction between structure characteristics and sedimentary fill in Weixi''nan sag during Liushangang-2member to Liushagang-1member depositional period, which provides the oilfield exploration and development with a degree of instructions in study area.关键词
构造特征/沉积充填/构造转换带/流沙港组一段/流沙港组二段/涠西南凹陷Key words
structure characteristics/sedimentary fill/structural transfer zones/Liushagang-1 member/Liushagang-2 member/Weixi&apos/nan sag分类
能源科技引用本文复制引用
刘一鸣,陈明明,胡林,张强,吴智平,颜世永,张毅,平明明,张勐,郭甜甜..涠西南凹陷流沙港组二段至一段构造特征及其对沉积的控制作用[J].东北石油大学学报,2018,42(6):52-61,前插4-前插5,12.基金项目
国家科技重大专项 (2016ZX05024-002-001) （2016ZX05024-002-001）
中央高校基本科研业务费专项资金项目 (16CX06043A) （16CX06043A）
