鄂尔多斯盆地延长组风暴沉积特征及意义——以环江地区长8油层组为例  

Characteristics and Significance of Storm Deposits in Yanchang Formation,Ordos Basin:Taking Chang 8 Oil-bearing Formation in Huanjiang Area as an Example

作　　者：安小平[1] 唐颖 周小英[1] 薄小松[1] 王昊 夏春明 张建亭 谭世豪 陈开运[2] AN Xiaoping;TANG Ying;ZHOU Xiaoying;BO Xiaosong;WANG Hao;XIA Chunming;ZHANG Jianting;TAN Shihao;CHEN Kaiyun(Research Institute of Exploration and Development,PetroChina Changqing Oilfield Company,Xi’ an,Shaanxi 710018,China;State Key Laboratory of Continental Dynamics,Northwest University,Xi’ an,Shaanxi 710069,China;College of Petroleum Engineering,Xi’ an Shiyou University,Xi’ an,Shaanxi 710065,China)

机构地区：[1]中国石油长庆油田分公司勘探开发研究院,陕西西安710018 [2]西北大学大陆动力学国家重点实验室,陕西西安710069 [3]西安石油大学石油工程学院,陕西西安710065

出　　处：《西安石油大学学报（自然科学版）》2021年第4期26-32,67,共8页Journal of Xi’an Shiyou University（Natural Science Edition）

基　　金：西北大学大陆动力学国家重点实验室开放课题基金(20LCD09);中国石油科技创新基金项目(2020D-5007-0202)。

摘　　要：为了解决环江油田浅水三角洲沉积相地质认识与生产实践之间日益突出的矛盾,通过岩心资料系统分析,发现鄂尔多斯盆地环江地区三叠系长8油层组除发育三角洲沉积相砂体外,还发育典型的风暴岩沉积。岩心上可见突变底界、冲刷充填构造、丘状交错层理和洼状交错层理、生物成因构造等。岩性与粒度分析表明,研究区沉积具有牵引流与密度流的双重属性。在此基础上,借鉴前人建立的延长组风暴岩沉积模式,建立了更加贴合环江地区长8油层组的风暴岩纵向沉积模式,形成了研究区长8油层组浅水湖泊三角洲沉积与风暴沉积共同作用的认识。In order to solve the increasingly prominent contradiction between the geological understanding of shallow water delta sedimentary facies in Huanjiang oilfield and production practice,through the systematic analysis of core data,it is found that the Triassic Chang 8 oil-bearing formation in Huanjiang area of Ordos Basin develops not only delta sedimentary facies sandbodies,but also typical tempestite deposits.Abrupt bottom boundary,scour-filling structure,mound cross bedding,sunken cross bedding and biogenic structure can be found by core observation.Lithology and grain size analysis show that the sediments in the study area have dual properties of tractive current and density current.On this basis,referring to the tempestite sedimentary mode of Yanchang Formation established by predecessors,the vertical sedimentary mode of tempestite which is more suitable for Chang 8 oil-bearing formation in Huanjiang area is established,and the understanding of the interaction between shallow lake delta deposition and tempestite deposition of Chang 8 oil-bearing formation in the study area is formed.

关 键 词：风暴沉积 丘状和洼状交错层理 长8油层组 环江地区 鄂尔多斯盆地 

分 类 号：TE121.3[石油与天然气工程—油气勘探]