关键词: 时间序列分析, AR模型, 废弃河道, 沉积相, 层序

Abstract:

Time series，which is an important branch of stochastic process，is applied to the analysis of sedimentation sequence of rocks.The vertical log profile is treated as time sequence data，so the well logs can be formulated by the auto-regression model of time series.Also，the parameters of the model can be estimated by the least squares estimation with well log data.That means the estimated model has learnt the deposition sequence on the spot of the corresponding well.At last，the model is used for verifying other wells whether they are of the same facies as the first well.This method is applied to identification of abandoned channel facies in Daqing Oilfield.The results show that，to the logging curves of the wells which are located at the same depositional facies，the error between estimated value and practical value is smaller and to the curves of the well located at abandoned channel，the error is greater.The conclusion that time series can be applied on the whether the wells are of the same depositional facies is drawn.

Key words: time series, AR model, abandoned channel, depositional facies, stratigraphic sequence