岩性油气藏 ›› 2021, Vol. 33 ›› Issue (6): 48–58.doi: 10.12108/yxyqc.20210606

• 油气地质 • 上一篇    下一篇

鄂尔多斯盆地陇东地区延长组三角洲前缘前积结构特征

冯雪1, 高胜利1,2, 刘永涛3, 王秀珍3   

  1. 1. 西安石油大学 地球科学与工程学院, 西安 710065;
    2. 陕西省油气成藏地质学重点实验室, 西安 710065;
    3. 中国石油集团东方地球物理勘探有限责任公司 研究院长庆分院, 西安 710021
  • 收稿日期:2021-04-25 修回日期:2021-06-30 出版日期:2021-12-01 发布日期:2021-11-25
  • 第一作者:冯雪(1997-),女,西安石油大学在读硕士研究生,研究方向为沉积学与储层地质学。地址:(710065)陕西省西安市雁塔区长延堡街道西安石油大学地球科学与工程学院。Email:1316247730@qq.com。
  • 基金资助:
    陕西省自然科学基础研究计划项目“基于生烃期古构造的致密油有利区识别方法—以鄂尔多斯盆地为例”（编号：2019JM-359）和基础研究项目“陇东地区延长组中上部地震沉积学研究”（编号：2020-63978）联合资助

Characteristics of delta front progradation structure of Yanchang Formation in Longdong area,Ordos Basin

FENG Xue1, GAO Shengli1,2, LIU Yongtao3, WANG Xiuzhen3   

  1. 1. School of Earth Sciences and Engineering, Xi'an Shiyou University, Xi'an 710065, China;
    2. Key Laboratory of Shaanxi Province for Oil and Gas Accumulation Geology, Xi'an 710065, China;
    3. Changqing Branch, Geophysical Research Institute, BGP, CNPC, Xi'an 710021, China
  • Received:2021-04-25 Revised:2021-06-30 Online:2021-12-01 Published:2021-11-25

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摘要： 为了克服二维地震资料在复杂构造中的多解性及其造成的砂体预测的不确定性，在沉积相带划分的基础上，利用迁移轨迹和前积结构相结合的方法，对二、三维地震资料进行详细解释，准确预测鄂尔多斯盆地陇东地区延长组砂体分布。研究表明，该区延长组发育有4种类型的前积结构：①S型-透镜状前积具有平坦或略微上升的迁移轨迹，有顶积层，一般发育三角洲前缘亚相，湖底发育泥岩；②S型-楔状前积具有平坦至下降的迁移轨迹，有厚底积层，发育三角洲砂岩和浊积岩；③切线斜交型-板状前积具有下降的迁移轨迹，有顶积层和底积层，发育三角洲前缘和浊积扇；④平行斜交型-楔状前积具有平坦的迁移轨迹，无顶积层和底积层，主要发育三角洲砂岩和砂质碎屑岩。其中S型-楔状前积、切线斜交型-板状前积为三角洲-浊积扇体系，为寻找岩性油气藏提供有利方向。

关键词: 迁移轨迹, 地震沉积学, 三角洲前缘, 深水沉积, 斜坡地形, 延长组, 鄂尔多斯盆地

Abstract: In order to overcome the multiplicity of 2D seismic data in complex structures and the uncertainty of sand body prediction, based on the division of sedimentary facies zones, the 2D and 3D seismic data were interpreted in detail by using the method of migration trajectory and progradational configuration, and the sand body distribution of Yanchang Formation in Longdong area was predicted. The results show that there are four types of progradational configuration of Yanchang Formation in the study area. (1) S-type lenticular progradation has a flat or slightly upward migration path, with top deposit, delta front subfacies and mudstone at the bottom of the lake. (2) S-type wedge-shaped progradation has a flat to descending migration path, with thick basement, and delta sandstone and turbidite are developed. (3) Tangential oblique plate-shaped progradation has a descending migration path, with top and bottom layers, and delta front and turbidite fan are developed. (4) Parallel oblique wedge-shaped progradation has a flat migration path, without top and bottom beds, and delta sandstone and sandy clastic rocks are developed. S-type wedge-shaped progradation and tangential oblique plate-shaped progradation are delta turbidite fan systems, which are favorable directions for lithologic reservoir exploration.

Key words: migration trajectory, seismic sedimentology, delta front, deep water deposition, slope topography, Yanchang Formation, Ordos Basin

中图分类号: 

  • TE122.1
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