河控浅水三角洲平原亚相沉积模式探讨——以鄂尔多斯盆地S59区块山西组一段为例  

Discussion on a sedimentary model of river-controlled shallow-water delta plain subfacies:Taking the Shanxi Formation of the S59 Block Gas Field in Ordos Basin as an example

作　　者：欧阳诚 段新国[2] 方健 刘金库 吴婷 彭宇 李洲 宋荣彩[2] OUYANG Cheng;DUAN Xinguo;FANG Jian;LIU Jinku;WU Ting;PENG Yu;LI Zhou;SONG Rongcai(Geological Exploration and Development Research Institute of CNPC Chuanqing Drilling Engineering Company Limited,Chengdu 610051,China;College of Energy,Chengdu University of Technology,Chengdu 610059,China;Sulige Project Management Department of CNPC Chuanqing Drilling Engineering Company Limited,Chengdu 610051,China)

机构地区：[1]中国石油川庆钻探工程公司地质勘探开发研究院,成都610051 [2]成都理工大学能源学院,成都610059 [3]中国石油川庆钻探工程公司苏里格项目经理部,成都610051

出　　处：《成都理工大学学报（自然科学版）》2024年第1期102-116,129,共16页Journal of Chengdu University of Technology: Science & Technology Edition

基　　金：国家自然科学基金项目(41672105)。

摘　　要：鄂尔多斯盆地S59区块山一段,整体具有构造稳定、地势平坦、古水深较浅、湖平面频繁升降、物源充足等特点,发育浅水三角洲沉积体系。本文在前人研究的基础上,通过对取心井岩心分析及侧井相分析,探讨了浅水三角洲的沉积特征,建立了浅水三角洲平原亚相沉积模式。研究结果表明,山西组山一段为河控浅水三角洲沉积,浅水三角洲的陆上部分沉积过程与曲流河沉积具有一致性,发育边滩、“渐弃型”废弃河道、决口扇和洪泛平原等微相,平面上河道在凹岸不断侵蚀,凸岸不断堆积形成边滩微相。此外在凹岸发育一定规模的废弃河道,河道砂体呈南北向分布,发育少量的决口扇沉积,在河道间发育细粒沉积洪泛平原亚相。三角洲平原亚相沉积模式的建立为预测优质砂体发育位置提供地质依据。The Shan-1 member of the S59 Block in Ordos Basin is characterized by a stable structure,flat terrain,shallow ancient water depth,frequent rising and falling lake plane,sufficient provenance,and the development of a triangular,shallow-water deposition.On the basis of previous studies,the sedimentary characteristics of this shallow-water delta were discussed in terms of core samples from the well and well-logging facies analysis.Based on these,a sedimentary model of shallow-water delta plain subfacies was established.The results showed that the Shanxi Formation,Shan-1 Formation,represents the sedimentation of a river-controlled shallow-water delta.The sedimentary processes in the terrestrial portion of this shallow-water delta are consistent with meandering river deposition.Various microfacies are developed,including floodplain,“abandoned-type”abandoned river channels,mouth bars,and alluvial plains.On the map view,the river channels continuously erode on the concave banks and deposit sediments on the convex banks,forming microfacies of floodplains.Additionally,abandoned river channels of a certain scale are developed on the concave banks.The channel sands are distributed in a north-south direction,with a minor amount of mouth bar deposition.Fine-grained floodplain subfacies develop between the river channels.By clarifying the sedimentary characteristics of the first member of the Shanxi Formation,the establishment of the sedimentary model for deltaic plain subfacies provides geological evidence for predicting the development location of high-quality sand bodies.

关 键 词：鄂尔多斯盆地 山一段 河控浅水三角洲 三角洲平原亚相 沉积模式 

分 类 号：P618.13[天文地球—矿床学]