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Geoscience ›› 2023, Vol. 37 ›› Issue (05): 1232-1242.DOI: 10.19657/j.geoscience.1000-8527.2023.021

• Sedimentology • Previous Articles     Next Articles

Sedimentary Characteristics of Beach Bar in the Paleogene Upper Shahejie Formation (4th Member) in Shanghe Area, Huimin Depression, Bohai Bay Basin

SHU Qinglin1(), ZHAO Hui2, JIANG Zaixing3(), ZHAO Guoguang4   

  1. 1. SINOPEC Shengli Oilfield Company, Dongying, Shandong 257061, China
    2. Petroleum Development Center, SINOPEC Shengli Oilfield Company, Dongying, Shandong 257061, China
    3. School of Energy Resources, China University of Geosciences (Beijing), Beijing 100083, China
    4. Dida Huineng (Beijing) Technology Co.Ltd., Beijing 100085, China
  • Received:2022-10-03 Revised:2023-03-07 Online:2023-10-10 Published:2023-11-14

Abstract:

In recent years, the research of the Shanghe area is based on a large range of regional background, and the research of the refinement of the Upper Shahejie Formation (4th Member) in Shanghe area is relatively scarce.Based on core logging data, we analyzed the types and characteristics of sedimentary microfacies in the Upper Shahejie Formation (4th Member) in Shanghe area.The planar distribution and control factors of sedimentary microfacies in each period are analyzed based on system tract.The results show that the Upper Shahejie Formation (4th Member) in Shanghe area is mainly located in a littoral and shallow lacustrine sedimentary environment, and there are mainly two sedimentary facies types (i.e., wind-wave beach bar and storm beach bar).The sedimentary structure includes mainly wave-like sand lamination and wave-like bedding reflecting wind and wave action, and cross-bedding of mounds and depressions reflecting storm action.The logging curves comprise four types: tooth funnel, low amplitude tooth, middle-high amplitude finger and box.The lowstand systems tract of the Upper Shahejie Formation (4th Member) is dominated by a lakeside sedimentary environment, where wind-wave beach bar is mainly developed, while two types of beach bar are developed in the transgressive systems tract and the highland systems tract.The beach bars are controlled by the paleosource, the paleobathymetry and the paleogeomorphology, especially during periods of lake transgression and high elevation, wind-wave beach bar is developed in the low uplift area in the northwest of Shanghe area.Meanwhile, storm beach bars are developed in the deep low-lying area in the southeast of Shanghe area.

Key words: Shanghe Area, Upper Shahejie Formation (4th Member), sedimentary facies, beach bar, control factor

CLC Number: