| 引用本文: | 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.[点击复制] |
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| 鄂尔多斯盆地延长组长9油层组三角洲砂岩沉积特征 |
| 丁熊,田景春,姚泾利,余杭航,罗安湘 |
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(1. 成都理工大学博士后流动站, 四川 成都 610059;
2. 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;
3. 西南石油大学地球科学与技术学院, 四川 成都 610500;
4. 中国石油长庆油田公司勘探开发研究院, 陕西 西安 710018;
5. 低渗透油气田勘探开发国家工程实验室, 陕西 西安 710018) |
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| 摘要: |
| 通过钻井、录井、测井及岩心等资料的综合分析,识别出辫状河三角洲和曲流河三角洲是鄂尔多斯盆地上三叠统延长组长9油层组主要的三角洲沉积相类型。辫状河三角洲分布于盆地西部,辫状分流河道和辫状水下分流河道发育砂岩,砂岩中主要发育冲刷面、槽状交错层理、板状交错层理和平行层理等,以向上变细的正粒序为主,砂岩粒度概率曲线主要为两段式或三段式。曲流河三角洲分布于盆地东部,陆上分流河道、水下分流河道和河口坝发育砂岩,砂岩中主要发育冲刷面、槽状交错层理、板状交错层理、平行层理和砂纹层理等,以向上变细的正粒序为主,也可见向上变粗的逆粒序,砂岩粒度概率曲线主要为两段式或三段式,可见四段式。进一步的对比分析表明,盆地内长9油层组辫状分流河道、辫状水下分流河道和陆上分流河道中砂体最发育,水下分流河道和河口坝砂体次之。 |
| 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 |
| DOI： |
| 附件 |
| 投稿时间：2014-08-29修订日期：2015-06-17 |
| 基金项目: |
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| Sedimentary characteristics of the delta sandstones from the Chang-9 oil reservoirs in the Yanchang Formation,Ordos Basin |
| DING Xiong, TIAN Jing-chun, YAO Jing-li, YU Hang-hang, LUO An-xiang |
(1. Postdoctoral Research Station, Chengdu University of Technology, Chengdu 610059, Sichuan, China;
2. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu 610059, Sichuan, China;
3. School of Earth Sciences and Technology, Southwest Petroleum University, Chengdu 610500, Sichuan, China;
4. Research Institute of Petroleum Exploration and Development, Changqing Oil Field Company, CNPC, Xi'an 710021, Shaanxi, China;
5. National Engineering Laboratory for Exploration and Development of Low-Permeability Oil and gas Fields, Xi'an 710018, Shaanxi, China) |
| 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. |
| Key words: braided delta meandering delta Chang-9 oil reservoirs Ordos Basin |
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