Notice of RetractionApplication of improved collocated cokriging

Notice of Retraction

After careful and considered review of the content of this paper by a duly constituted expert committee, this paper has been found to be in violation of IEEE´s Publication Principles.

We hereby retract the content of this paper. Reasonable effort should be made to remove all past references to this paper.

The presenting author of this paper has the option to appeal this decision by contacting TPII@ieee.org.

The collocated cokriging is such a method that can simulate primary parameter distribution integrating secondary parameter with high efficiency. However, the problem of variance inflation in sequential Gaussian simulation with collocated cokriging causes the input statistics not be reproduced. In this paper, an improved method is introduced. That is the secondary data is used not only at the location being estimated but also at all conditional data locations. An example in Zaoyuan well pattern of Qinshui Basin is presented. In this example, the porosity is primary parameter and ash content is as secondary parameter. The simulated results from traditional and improved methods are compared. The variance inflation observed in the models built by traditional method does not appear in the models constructed by improved method.