东海陆架盆地西湖凹陷平湖斜坡带平湖组煤系地层地震沉积学研究

张兰, 何贤科, 段冬平, 常吟善, 汪文基, 刘英辉. 东海陆架盆地西湖凹陷平湖斜坡带平湖组煤系地层地震沉积学研究[J]. 海洋地质与第四纪地质, 2023, 43(4): 140-149. doi: 10.16562/j.cnki.0256-1492.2022092103
引用本文: 张兰, 何贤科, 段冬平, 常吟善, 汪文基, 刘英辉. 东海陆架盆地西湖凹陷平湖斜坡带平湖组煤系地层地震沉积学研究[J]. 海洋地质与第四纪地质, 2023, 43(4): 140-149. doi: 10.16562/j.cnki.0256-1492.2022092103
ZHANG Lan, HE Xianke, DUAN Dongping, CHANG Yinshan, WANG Wenji, LIU Yinghui. Seismic sedimentological analysis of coal stratigraphy of Pinghu Formation in the Pinghu slope belt, Xihu Sag, East China Sea Shelf Basin[J]. Marine Geology & Quaternary Geology, 2023, 43(4): 140-149. doi: 10.16562/j.cnki.0256-1492.2022092103
Citation: ZHANG Lan, HE Xianke, DUAN Dongping, CHANG Yinshan, WANG Wenji, LIU Yinghui. Seismic sedimentological analysis of coal stratigraphy of Pinghu Formation in the Pinghu slope belt, Xihu Sag, East China Sea Shelf Basin[J]. Marine Geology & Quaternary Geology, 2023, 43(4): 140-149. doi: 10.16562/j.cnki.0256-1492.2022092103

东海陆架盆地西湖凹陷平湖斜坡带平湖组煤系地层地震沉积学研究

  • 基金项目: 中国海洋石油有限公司科技项目“平湖斜坡带孔宝地区平湖组古地貌恢复及有利砂体表征”(sh-zlky-2021-2);中海石油(中国)有限公司重大科技专项“西湖凹陷在生产油气田中后期综合调整关键技术研究与实践”(CNOOC-KJ135ZDXM39SH03)
详细信息
    作者简介: 张兰(1988—),女,硕士,主要从事盆地层序地层学、沉积学及储层预测研究,E-mail:zhanglan5@cnooc.com.cn
  • 中图分类号: P736

Seismic sedimentological analysis of coal stratigraphy of Pinghu Formation in the Pinghu slope belt, Xihu Sag, East China Sea Shelf Basin

  • 西湖凹陷平湖斜坡带油气资源丰富,主要目的层平湖组为一套海陆过渡的含煤地层,埋深大,沉积环境复杂,储层展布认识不清。综合地震、岩芯、测井等资料,深入分析斜坡带平湖组煤系地层发育特征,建立了研究区高精度等时地层格架,在平湖组三级层序内部细分出低位域、海侵域、高位域。在层序格架约束下,创新性地将多数据体迭代分析、多属性综合分析、地震相识别与拼接等技术有效地应用于地震沉积学研究,进行“地震相-沉积相”的有效转化,重建区域沉积体系。研究表明:SQ3低位域内发育早期建设性三角洲和晚期孤立分流河道沉积,水道沿凹陷长轴方向展布;海侵域时期,研究区南部受潮汐影响强,中小规模垂直岸线的潮道频繁发育,向北河控作用增强,发育受潮汐影响的三角洲水下分流河道;高位域发育三角洲平原沉积,以大规模的北西-南东向分流河道沉积为主。

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  • 图 1  西湖凹陷平湖斜坡带综合地质图

    Figure 1. 

    图 2  研究区连井层序地层图

    Figure 2. 

    图 3  研究区地震层序地层图

    Figure 3. 

    图 4  研究区砂泥岩纵波阻抗分布图

    Figure 4. 

    图 5  不同深度段AVO 梯度体切片与90°相移体切片对比

    Figure 5. 

    图 6  2砂组地层切片及沉积学解释

    Figure 6. 

    图 7  研究区平湖组沉积相标志及演化特征

    Figure 7. 

    图 8  地震背景相识别与拼接实例

    Figure 8. 

    图 9  SQ2海侵域多属性地层切片及沉积学解释(10砂组)

    Figure 9. 

    图 10  SQ3低位域多属性地层切片及沉积学解释(7下砂组)

    Figure 10. 

    图 11  SQ3高位域多属性地层切片及沉积学解释(4砂组)

    Figure 11. 

    表 1  地层切片数据体选取与流程优化

    Table 1.  Stratigraphic slice data set selection and procedure optimization

    常规地震AVO梯度
    物理意义纵波阻抗变化率纵波速度/横波速度变化率
    岩性预测浅层效果好,深层差深层效果好
    沉积等时性稳定标志层表现稳定同相轴,代表等时界面能较好反映复合砂体界面,不一定等时
    储层内部非均质性振幅、波形局部变化均能较好指示储层内部非均质变化抗噪性和分辨率低,主要反映储层形态,细节敏感性偏低
    技术优化
    下载: 导出CSV
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出版历程
收稿日期:  2022-09-21
修回日期:  2023-02-12
录用日期:  2023-02-12
刊出日期:  2023-08-28

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