大庆长垣萨二组重力流沉积特征及沉积模式  

Characteristics and Sedimentary Model of Gravity Flow Sediment of SII Formation in Daqing Changyuan

作　　者：刘春杨[1] LIU Chunyang(Research Institute of Exploration & Development,Daqing Oilfield Company Ltd.,Daqing,Heilongjiang 163712,China)

机构地区：[1]大庆油田勘探开发研究院,黑龙江大庆163712

出　　处：《西安石油大学学报（自然科学版）》2021年第4期33-42,共10页Journal of Xi’an Shiyou University（Natural Science Edition）

基　　金：国家科技重大专项“低渗、特低渗复杂油藏规模有效动用关键技术”(2017ZX05013006)。

摘　　要：为了进一步提高已开发油田采收率,对大庆长垣萨二组进行精细储层描述,发现萨II5小层南部在前三角洲亚相中发育大面积席状砂沉积,砂体与泥岩均呈突变接触,事件性沉积特征明显。粒度概率累积曲线上表现为“两段式”或“单段式”,C-M图上样点群平行于C-M基线分布,指示沉积物由跳跃组分和悬浮组分组成,分选差,综合分析认为它是重力流成因,并识别出滑动-滑塌沉积、碎屑流沉积和浊流沉积3种重力流沉积类型。萨南地区构造微隆起为重力流形成提供了地形条件,地震是主要触发因素。In order to further improve the oil recovery of the developed oilfields,the fine description of SII reservoir in Daqing Changyuan is carried out.A large area of sheet sand deposition is found in the pre-delta subfacies in the south of II5 layer.The sand body and mudstone are in abrupt contact,and the event sedimentary characteristics are obvious.The probability cumulative curves of grain size have features of"two-section"or"single-section".On C-M diagram,the data distribution of samples is parallel to C-M baseline,which indicates that the sediment is composed of jumping component and suspended component,and its sorting is poor.Based on the comprehensive analysis,it is held that the sedimentis a gravity flow sand body,in which three types of gravity flow deposition are identified,namely slip-slump deposition,debris current deposition and turbidite current deposition.Combined with the previous research results,the sedimentary characteristics of adjacent layers and the variation of stratum thickness,it is considered that the tectonic micro uplift in Sa'nan area provides the topographic condition for the formation of gravity flow,and the earthquake is the main trigger factor.

关 键 词：重力流 萨二组 储层描述 沉积相 沉积模式 大庆长垣 

分 类 号：TE121.3[石油与天然气工程—油气勘探]