新疆石油地质

新疆石油地质 ›› 2018, Vol. 39 ›› Issue (zk(English) ): 124-133.

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Architecture Analysis and Remaining Oil Distribution in Mouth Bar: A Case Study of the First Member of Xishanyao Formation in Wellblock Cai-10 and Caican-2, Cainan Oilfield

YIN Senlin1, ZHANG Tong2, WAN Wensheng2, WU Chengmei2, LI Chen2, FENG Wenjie3   

  1. 1. Institute of Mud Logging Technology and Engineering, Yangtze University, Jingzhou, Hubei 434023, China;
    2. Zhundong Oil Production Plant, Xinjiang Oilfield Company, PetroChina, Fukang, Xinjiang 831511, China;
    3. College of Geosciences, Yangtze University, Wuhan, Hubei 434023, China
  • 收稿日期:2018-02-24 修回日期:2018-04-25 出版日期:2019-01-01 发布日期:2021-05-19

Architecture Analysis and Remaining Oil Distribution in Mouth Bar: A Case Study of the First Member of Xishanyao Formation in Wellblock Cai-10 and Caican-2, Cainan Oilfield

YIN Senlin1, ZHANG Tong2, WAN Wensheng2, WU Chengmei2, LI Chen2, FENG Wenjie3   

  1. 1. Institute of Mud Logging Technology and Engineering, Yangtze University, Jingzhou, Hubei 434023, China;
    2. Zhundong Oil Production Plant, Xinjiang Oilfield Company, PetroChina, Fukang, Xinjiang 831511, China;
    3. College of Geosciences, Yangtze University, Wuhan, Hubei 434023, China
  • Received:2018-02-24 Revised:2018-04-25 Online:2019-01-01 Published:2021-05-19
  • About author:YIN Senlin, E-mail: yinxing_love@qq.com

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摘要： To study the inner architecture and remaining oil distribution in the mouth bar of meandering river delta, based on the production performance and core data in the Wellblock Cai-10 and Caican-2 of Cainan oilfield, the paper performs detailed analysis on the mouth bar architecture by using the methods of analytical hierarchy process, multi-dimensional interaction and dynamic verification, and establishes mouth bar architecture models for the meandering river delta in the study area. The study shows that there are 2 categories of marks to identify mouth bar boundary, namely vertical superposition of the units of different periods and lateral merging of the units of same periods, among which the latter structure can be classified into 3 types such as main body-main body of the mouth bar, main body-bar margin-main body and main body-between-bar mud. There are 2 mouth bar architecture models such as progradation and accretion. The progradational architecture model mainly refers to the structures in which the sediments of late stage accreted and superposed onto the mouth bars of early stage when the distributary channel was under the circumstance of stable hydrodynamic force, and the lateral accretional architecture model mainly refers to the mouth bars which are developed at the margin of breached distributary channel when the hydrodynamic force became stronger. In the study area, there are 129 single mouth bars and 12-24 mouth bars that are developed in the single layers. The single mouth bars are about 500 m long and 450 m wide. The dip angle of accretional architecture mouth bar is 0.31°-2.40°, which decreases from bottom to top. The remaining oil distribution can be divided into 4 patterns, namely retention, one-way effect, poor water injection effect and planar interference patterns. Various development programs and measures can be adopted to enhance oil recovery.

关键词: Cainan oilfield, Wellblock Cai-10, Wellblock Caican-2, Xishanyao formation, mouth bar, architecture analysis, remaining oil distribution

Abstract: To study the inner architecture and remaining oil distribution in the mouth bar of meandering river delta, based on the production performance and core data in the Wellblock Cai-10 and Caican-2 of Cainan oilfield, the paper performs detailed analysis on the mouth bar architecture by using the methods of analytical hierarchy process, multi-dimensional interaction and dynamic verification, and establishes mouth bar architecture models for the meandering river delta in the study area. The study shows that there are 2 categories of marks to identify mouth bar boundary, namely vertical superposition of the units of different periods and lateral merging of the units of same periods, among which the latter structure can be classified into 3 types such as main body-main body of the mouth bar, main body-bar margin-main body and main body-between-bar mud. There are 2 mouth bar architecture models such as progradation and accretion. The progradational architecture model mainly refers to the structures in which the sediments of late stage accreted and superposed onto the mouth bars of early stage when the distributary channel was under the circumstance of stable hydrodynamic force, and the lateral accretional architecture model mainly refers to the mouth bars which are developed at the margin of breached distributary channel when the hydrodynamic force became stronger. In the study area, there are 129 single mouth bars and 12-24 mouth bars that are developed in the single layers. The single mouth bars are about 500 m long and 450 m wide. The dip angle of accretional architecture mouth bar is 0.31°-2.40°, which decreases from bottom to top. The remaining oil distribution can be divided into 4 patterns, namely retention, one-way effect, poor water injection effect and planar interference patterns. Various development programs and measures can be adopted to enhance oil recovery.

Key words: Cainan oilfield, Wellblock Cai-10, Wellblock Caican-2, Xishanyao formation, mouth bar, architecture analysis, remaining oil distribution