| 冲积平原古土壤类型的识别及其层序地层意义——以大庆长垣扶余油层为例 |
| |
| 引用本文： | 郑文波,邓宏文.冲积平原古土壤类型的识别及其层序地层意义——以大庆长垣扶余油层为例[J].吉林大学学报(地球科学版),2012(Z1):135-144. |
| |
| 作者姓名： | 郑文波 邓宏文 |
| |
| 作者单位： | 中国地质大学能源学院 |
| |
| 基金项目： | 国家科技重大专项(2009ZX05009) |
| |
| 摘 要： | 基准面旋回控制下的河道沉积速率、河道侧向迁移频率、溢岸沉积速率、溢岸暴露时间等是影响冲积平原古土壤发育特征与成熟度的主控因素。通过分析不同级别基准面旋回变化过程中冲积平原古土壤的地层学与沉积学响应,建立基准面旋回下的冲积平原古土壤演化模式,可以为层序界面的识别和A/S变化分析提供依据。松辽盆地大庆长垣区泉头组扶余油层以河流-冲积平原沉积体系为主,可识别出5种类型的古土壤:红色暴露型、红色加积型、红绿互层加积型、绿色加积型和灰色加积型,其成熟度依次降低。研究认为,在长期(三级)、中期(四级)基准面旋回内,随着A/S增大,古土壤成熟度逐渐降低。古土壤垂向序列和分布范围可以提供河流相基准面旋回的变化信息:广泛发育、可区域对比、高成熟度的红色暴露型古土壤可以作为层序界面或基准面旋回下降到上升的转换面;而厚层分布、可区域对比、低成熟度的灰色古土壤可以作为高级次层序基准面上升到下降的转换面。
|
| 关 键 词： | 古土壤 成熟度 基准面旋回 河流相 扶余油层 地层学 |
Identification and Stratigraphy of Paleosol Type in Floodplain: An Example from Fuyu Unit,Daqing Oilfield |
| |
| Zheng Wen-bo,Deng Hong-wen.Identification and Stratigraphy of Paleosol Type in Floodplain: An Example from Fuyu Unit,Daqing Oilfield[J].Journal of Jilin Unviersity:Earth Science Edition,2012(Z1):135-144. |
| |
| Authors: | Zheng Wen-bo Deng Hong-wen |
| |
| Institution: | School of Energy Resources,China University of Geosciences,Beijing 100083,China |
| |
| Abstract: | The factors that influence the maturity of paleosol in fluvial system include sedimentation rate,lateral migration frequency,and exposure time,which are under the control of base-level cycle.Formation and evolution model of paleosol in base level cycle is established by analyzing the changes of paleosol sequence in different base level cycles that helps to identify the sequence boundaries and provides a basis of A/S ratio.In our study of Fuyu unit in Changyuan area of Daqing oilfield,we recognized five types of paleosols,such as red exposure paleosol,red aggradational paleosol,reddish-greenish paleosol,green paleosol,gray paleosol,and ordered as decrease in maturity.The paleosol cycle suggests that its maturity decreases as the A/S ratio increases and base level rise in long-term(three),medium-term(four) base level cycle.Extensive and regional mature red exposure paleosol can be considered as the maker of base level from fall to rise,while thick and broad gray paleosol can be taken as the surface of base level from rise to fall. |
| |
| Keywords: | paleosol maturity base level cycle fluvial Fuyu layer stratigraphy |
| 本文献已被 CNKI 等数据库收录！ |
|
