新疆石油地质

新疆石油地质 ›› 2016, Vol. 37 ›› Issue (zk(English) ): 60-65.

• OIL AND GAS EXPLORATION • 上一篇    下一篇

Depositional Characteristics and Hydrocarbon Exploration Significance of Shallow-Water Deltas: A Case Study of Upper Sha-1 Member in Chaheji Structural Belt of Baxian Sag, Bohai Bay Basin

LYU Chuanbing1,2, CHENG Tongran1, ZHANG Feng2, JI Youliang1, LIANG Guanzhong2, LI Yanguo2   

  1. 1. State Key Laboratory of Petroleum Resources, Prospecting, School of Geosciences, China University of Petroleum, Beijing 102249, China;
    2. Development Department, Huabei Oilfield Company, PetroChina, Renqiu, Hebei 062552, China
  • 出版日期:2017-01-01 发布日期:2021-05-24
  • 作者简介:LYU Chuanbing,E-mail:pjb_lcb@petrochina.com.cn

Depositional Characteristics and Hydrocarbon Exploration Significance of Shallow-Water Deltas: A Case Study of Upper Sha-1 Member in Chaheji Structural Belt of Baxian Sag, Bohai Bay Basin

LYU Chuanbing1,2, CHENG Tongran1, ZHANG Feng2, JI Youliang1, LIANG Guanzhong2, LI Yanguo2   

  1. 1. State Key Laboratory of Petroleum Resources, Prospecting, School of Geosciences, China University of Petroleum, Beijing 102249, China;
    2. Development Department, Huabei Oilfield Company, PetroChina, Renqiu, Hebei 062552, China
  • Online:2017-01-01 Published:2021-05-24
  • About author:LYU Chuanbing,E-mail:pjb_lcb@petrochina.com.cn

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摘要： Reservoirs of shallow-water delta facies are the dominant oil and gas reservoirs in the upper Sha-1 member of Shahejie formation in Chaheji structural belt of Baxian sag in Jizhong depression, Bohai Bay basin. Based on the analyses of petrological features, tectono-sedimentary characteristics, grain sizes and fossils, the paper studies the sedimentary characteristics and sedimentary facies distribution of shallow-water delta systematically, summarizes the depositional model of shallow-water delta and describes the favorable accumulation conditions of shallow-water delta. The study results show that in the upper Sha-1 member, the distributary channel of shallow-water delta is well developed, river mouth bar does not occur and large-area sheet sands are extensively distributed. The cyclic variations of lake level result in sandstone interbedded with mud at multi-stages, which is the main controlling factor of sand body distribution. The sedimentary characteristics of shallow-water delta could determine that in this facies there exist pretty good reservoir-caprock assemblages and various traps are then formed due to faulting to sandbodies. The upper Sha-1 member in Chaheji structural belt has good oil and gas accumulation conditions.

关键词: Bohai Bay basin, Baxian sag, Chaheji structural belt, Shahejie formation, shallow-water delta facies, sedimentary characteristic, depositional model

Abstract: Reservoirs of shallow-water delta facies are the dominant oil and gas reservoirs in the upper Sha-1 member of Shahejie formation in Chaheji structural belt of Baxian sag in Jizhong depression, Bohai Bay basin. Based on the analyses of petrological features, tectono-sedimentary characteristics, grain sizes and fossils, the paper studies the sedimentary characteristics and sedimentary facies distribution of shallow-water delta systematically, summarizes the depositional model of shallow-water delta and describes the favorable accumulation conditions of shallow-water delta. The study results show that in the upper Sha-1 member, the distributary channel of shallow-water delta is well developed, river mouth bar does not occur and large-area sheet sands are extensively distributed. The cyclic variations of lake level result in sandstone interbedded with mud at multi-stages, which is the main controlling factor of sand body distribution. The sedimentary characteristics of shallow-water delta could determine that in this facies there exist pretty good reservoir-caprock assemblages and various traps are then formed due to faulting to sandbodies. The upper Sha-1 member in Chaheji structural belt has good oil and gas accumulation conditions.

Key words: Bohai Bay basin, Baxian sag, Chaheji structural belt, Shahejie formation, shallow-water delta facies, sedimentary characteristic, depositional model