Microfacies modeling for distributary channel sandbody by using indicator principal component simulation

Indicator principal component microfacies simulation is a technique for describing lithofacies or microfacies distribution using sequential indicator simulation method based on selection of principal components with discontinuous variables.The method is fast and convenient in operation by using more original information.Based on the geological knowledge about reservoir,a 3D microfacies model of unit S II7+8 fluvial sandbody of study area was developed with the indicator principal component simulation method. Compared with the conventional 2D microfacies model,the 3D model can show the fluvial sandbody constitutes in the vertical direction,and the distribution of flow units in 3D space.The technique is useful for detailed reservoir description and potential study of Daqing Oilfield in the later period of high water cut.