地质与勘探2018，Vol.54Issue(1)：183-192,10.
陆相湖盆深水重力流沉积特征、砂体结构研究及油气勘探意义—以鄂尔多斯盆地上三叠统长7油层组为例
Sedimentary Characteristics and Sand Architecture of Gravity Flows in Terrestrial Lacustrine Basins:A Case Study of Chang 7 Formation of the Upper Triassic in Ordos Basin
摘要
Abstract
This paper presents an analysis of field profiles,cores and logging data based on the theory of deep-water gravity flow deposition. Our purpose is to describe the types and characteristics of gravity flow sedimentary facies and sand architecture of Chang 7 Formation in the Heshui area of Or-dos basin. Research shows that a large-extent deep-water sandstone formed during the sedimentary period of Chang 7 in this area,dominated by sandy debris flow and turbidity flow. The sandy debris flow created massive beddings with thick individual sand bodies. The turbidity flow mainly produced gra-ded beddings with many sand-mud interbeds. In light of logging curves, vertical thickness and continuity and combination features, the structures of sand bodies are divided into four types,i.e.,overlaps of multiphase sands,interbeds of thick sand and thin mud,interbeds of thick sand,thin sand and mud,and interbeds of thin sand and thick mud. Then cluster analysis is made to sand-body structures of single wells in the study area. Research further shows that the sandy debris flows are favorable reservoir areas,but they are widely distributed. So they should be further subdivided based on the charac-teristics of sand architectures,which may shed light on how to optimize favorable tight reservoir areas.关键词
鄂尔多斯盆地/长7油层组/重力流沉积/砂质碎屑流/浊流/砂体结构Key words
Ordos basin/Chang 7 Formation/sediment of gravity flow/sandy debris flow/turbidity flow/sand architecture分类
能源科技引用本文复制引用
时建超,屈雪峰,雷启鸿,祁越,李书恒,谢启超..陆相湖盆深水重力流沉积特征、砂体结构研究及油气勘探意义—以鄂尔多斯盆地上三叠统长7油层组为例[J].地质与勘探,2018,54(1):183-192,10.基金项目
国家重大科技专项"鄂尔多斯盆地致密油开发示范工程"(编号:2017ZX05069),中石油股份有限公司重大科技专项"长庆油田5000万吨持续高效稳产关键技术研究与应用"(编号:2016E-05)联合资助. （编号:2017ZX05069）
