Lithologic Reservoirs ›› 2021, Vol. 33 ›› Issue (4): 121-127.doi: 10.12108/yxyqc.20210413

• EXPLORATION TECHNOLOGY • Previous Articles     Next Articles

Analysis and application of formation average velocity based on multiple linear regression: A case study from A oilfield in Bohai Sea

GU Zhimeng, MING Jun, LIU Chuanqi, WANG Teng   

  1. Bohai Oilfield Research Institute, Tianjin Branch, CNOOC, Tianjin 300452, China
  • Received:2020-05-11 Revised:2020-11-05 Online:2021-08-01 Published:2021-08-06

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Abstract: Formation average velocity is often used for time depth conversion to reflect the real characteristics of underground structures,however,there are many factors that affect formation average velocity and it is not easy to get the accurate velocity value. The formation average velocity formula was derived under stable deposition conditions,and it was transformed into a multiple linear fitting formula of gas-sand ratio,oil-sand ratio and sandstrata ratio by analyzing the sensitive factors affecting the formation average velocity of the study layer. The known drilling information was brought into the formula and the unknown term was solved by the least square method,then the final average velocity expression was obtained. The results of numerical simulation and application in A oilfield in Bohai Sea show that the calculated value of average velocity formula based on multiple linear regression has high prediction accuracy,the relative error between the calculated value and the real value is less than 0.5%. This method can be used for reference in areas with similar geological conditions.

Key words: average velocity, multivariate linear regression, sand-strata ratio, least-square method, low-amplitude structure

CLC Number: 

  • P631.8
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