Journal of Southwest Petroleum University(Science & Technology Edition) ›› 2022, Vol. 44 ›› Issue (6): 97-104.DOI: 10.11885/j.issn.1674-5086.2020.11.10.01

• OIL AND GAS ENGINEERING • Previous Articles     Next Articles

Research on Automatic History Matching Method Based on Multi Models

LU Yi1, HU Hao2, CHENG Yabin1, XIA Guochao3, REN Guangwen1   

  1. 1. Exploration and Development Research Institute, Dagang Oilfield, PetroChina, Binhai New Area, Tianjin 300280, China;
    2. COOEC-FLUOR Heavy Industries, Zhuhai, Guangdong 519090, China;
    3. Department of Resource Evaluation, Dagang Oilfield, PetroChina, Binhai New Area, Tianjin 300280, China
  • Received:2020-11-10 Published:2023-01-16

Abstract: In traditional reservoir numerical simulation, only a single random geological model is established, and the artificial history fitting method is used to obtain the geological model that conforms to reservoir production history and is used for project prediction. However, due to the relative scarcity of geological data and the heterogeneity of reservoir, the historical fitting problem must have multiple solutions, and the single geological model obtained cannot guarantee the accurate reflection of the real underground situation. In the numerical simulation study in this research, static geological data are used to produce a large number of random implementations, PCA dimensionality reduction method is used to reduce the amount of model data, and then the clustering method is used to select a number of implementations with different characteristics as the initial model. The automatic history fitting method based on SPSA algorithm was used to obtain several historical fitting models which conform to reservoir dynamics but contain different characteristics. Multi models can reflect the real underground situation more completely, and the prediction result is no longer a single dynamic curve, but a series of curves with multiple development possibilities, making the prediction more scientific and reliable.

Key words: automatic history matching, PCA dimensionality reduction, K-medoids clustering, SPSA algorithm, uncertainty evaluation

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