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强制水退背景下湖盆古水深变化特征探讨: 以涠西南凹陷西部渐新世早期湖盆为例

邹敏 孙莉 王鹏 严曙梅 何维领 赵刚 卢志远

邹敏, 孙莉, 王鹏, 严曙梅, 何维领, 赵刚, 卢志远. 强制水退背景下湖盆古水深变化特征探讨: 以涠西南凹陷西部渐新世早期湖盆为例[J]. 地质科技通报, 2022, 41(3): 132-139. doi: 10.19509/j.cnki.dzkq.2022.0070
引用本文: 邹敏, 孙莉, 王鹏, 严曙梅, 何维领, 赵刚, 卢志远. 强制水退背景下湖盆古水深变化特征探讨: 以涠西南凹陷西部渐新世早期湖盆为例[J]. 地质科技通报, 2022, 41(3): 132-139. doi: 10.19509/j.cnki.dzkq.2022.0070
Zou Min, Sun Li, Wang Peng, Yan Shumei, He Weiling, Zhao Gang, Lu Zhiyuan. Discussion on the variation characteristics of paleo-water-depth of lake basin under the background of forced regression: An example in the Early Oligocene of west of Weixi'nan Sag[J]. Bulletin of Geological Science and Technology, 2022, 41(3): 132-139. doi: 10.19509/j.cnki.dzkq.2022.0070
Citation: Zou Min, Sun Li, Wang Peng, Yan Shumei, He Weiling, Zhao Gang, Lu Zhiyuan. Discussion on the variation characteristics of paleo-water-depth of lake basin under the background of forced regression: An example in the Early Oligocene of west of Weixi'nan Sag[J]. Bulletin of Geological Science and Technology, 2022, 41(3): 132-139. doi: 10.19509/j.cnki.dzkq.2022.0070

强制水退背景下湖盆古水深变化特征探讨: 以涠西南凹陷西部渐新世早期湖盆为例

doi: 10.19509/j.cnki.dzkq.2022.0070
基金项目: 

中石化涠西区块少井条件下油藏描述技术研究 KJ-2019-14

详细信息
    作者简介:

    邹敏(1986—), 男, 副研究员, 主要从事储层沉积学、非常规油气地质方面的研究工作。E-mail: zoumin.syky@sinopec.com

  • 中图分类号: P531

Discussion on the variation characteristics of paleo-water-depth of lake basin under the background of forced regression: An example in the Early Oligocene of west of Weixi'nan Sag

  • 摘要:

    强制水退在地质历史时期普遍存在, 但由于物源供应不匹配, 地质记录较少, 研究案例更少。以南海西北部北部湾盆地涠西南凹陷渐新世早期涠四段湖盆为研究对象, 利用地震反射结构法开展了湖盆古水深恢复研究, 明确了强制水退背景下古水深变化特征, 并进一步探讨了利用三角洲前积结构法研究古水深的恢复方法。研究表明, 渐新世早期涠四段沉积时, 涠西南凹陷物源充足, 周缘发育大型下切河谷, 凹陷内发育大型斜交前积反射结构, 具有典型的强制水退特征, 形成了较大规模的强制水退体系域。通过对典型前积剖面的精细解剖, 识别出了强制水退体系域中的6个典型前积反射层。结合地震、钻井与砂泥岩压实系数, 恢复出湖盆古水深介于111.2~286.5 m, 平均为218.5 m。自湖盆边缘向中心方向, 前积层的高度和倾角呈先缓慢增大后快速减小特征, 表明湖盆古水深具有相似的变化特征。其中水深方面早期在230 m左右, 至中晚期逐步加深至280 m左右, 末期快速下降至110 m, 相较最大水深变化幅度达61.5%;前积层倾角早期在10°左右, 至中期达14.5°后逐步下降, 末期快速变化至2.9°, 倾角变化幅度达79.8%。结合区域地质研究认为涠四段沉积时经历的地质时期小于2 Ma, 古水深与前积层倾角在不到2 Ma内快速剧烈变化, 与强制水退特征基本一致, 印证了地震反射结构的响应特征。从理论模型和恢复参数优化方面探讨了利用三角洲前积结构进行古水深恢复的可行性与未来研究方向。上述研究成果为丰富和完善强制水退背景下湖盆古水深变化特征的认识提供了重要参考。

     

  • 图 1  涠西南凹陷区域地质概图及地层综合柱状图(据文献[15-16],有修改)

    Figure 1.  Regional geological overview and stratigraphic comprehensive histogram of the Weixi′nan Sag

    图 2  涠西南凹陷西部典型地震剖面斜交反射结构特征

    Figure 2.  Characteristics of oblique reflection structure of typical seismic profile in wertern part of the Weixi′nan Sag

    图 3  周缘下切谷发育特征(据文献[24])

    Figure 3.  Development characteristics of circumferentially incised valley

    图 4  三角洲前积层高度与水体深度的关系(据文献[25])

    细粒沉积:3°~5°; 中粒沉积:10余度; 粗粒沉积:20°~30°; 有的扇三角洲可达30余度

    Figure 4.  Relationship between delta foreset height and water depth

    图 5  地震剖面发育典型的前积反射层结构与前积层(图 2-c局部放大)

    Figure 5.  Typical foreset reflector structure and foreset layer number

    表  1  典型前积层计算参数统计

    Table  1.   Statistics of typical foreset layers calculation parameters

    前积层编号 前积层长度/m 前积层高度 前积层角度 压实恢复系数
    地震/m 压实恢复/m 地震/(°) 压实恢复/(°) 砂岩 泥岩
    1 1 260 125 232.76 5.67 10.47 0.19 0.61
    2 1 120 139 258.83 7.08 13.01 0.19 0.61
    3 1 000 139 258.83 7.91 14.51 0.19 0.61
    4 1 250 156 286.54 7.11 12.91 0.19 0.59
    5 960 91 163.97 5.42 9.69 0.19 0.57
    6 2 150 62 110.22 1.61 2.93 0.19 0.55
    平均 1 290 118.7 218.5 5.80 10.58 0.19 0.59
    下载: 导出CSV
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