沉积与特提斯地质Issue(4)：25-34,10.
鄂尔多斯盆地延长组长9油层组三角洲砂岩沉积特征
Sedimentary characteristics of the delta sandstones from the Chang-9 oil reservoirs in the Yanchang Formation,Ordos Basin
丁熊 1田景春 2姚泾利 1余杭航 3罗安湘4
作者信息
- 1. 成都理工大学博士后流动站，四川 成都 610059
- 2. 西南石油大学地球科学与技术学院，四川 成都 610500
- 3. 油气藏地质及开发工程国家重点实验室 成都理工大学，四川 成都 610059
- 4. 中国石油长庆油田公司勘探开发研究院，陕西 西安 710018
- 折叠
摘要
Abstract
The integration of well logs and core examination show that the braided delta and meandering delta are the major delta facies types in the Chang-9 oil reservoirs of the Upper Triassic Yanchang Formation,Ordos Basin. The braided delta sandstones in the western part of the Basin are built up of braided distributary channel and braided subaqueous distributary channel sandstones,and characterized by developed scour surface,trough cross-bedding,tabular cross-bedding and parallel bedding,fining-upward sequences,and two-step and / or three-step grain-size probability curves. The meandering delta sandstones in the eastern part of the Basin assembled by subaerial distributary channel,subaqueous distributary channel and channel-mouth bar sandstones display the sedimentary structures such as scour surface,trough cross-bedding,tabular cross-bedding,parallel bedding and ripple lamination,fining-upward (occassionally coarsening-upward)sequences,and two-step and / or three-step (occasionally four-step)garin-size probability curves. The braided distributary channel,braided subaqueous distributary channel and subaerial distributary channel sandstones are best developed,followed by subaqueous distributary channel and channel-mouth bar sandstones in the Chang-9 oil reservoirs of the Yanchang Formation in the Ordos Basin.关键词
辫状河三角洲/曲流河三角洲/长9油层组/鄂尔多斯盆地Key words
braided delta/meandering delta/Chang-9 oil reservoirs/Ordos Basin分类
天文与地球科学引用本文复制引用
丁熊,田景春,姚泾利,余杭航,罗安湘..鄂尔多斯盆地延长组长9油层组三角洲砂岩沉积特征[J].沉积与特提斯地质,2015,(4):25-34,10.
