The horizontal prediction of thickness and porosity of a sand member in a region was made by applying multivariate statistical method to seismic attribute, drilling and logging data.

Rational interpretation of well track position in reservoir, changes of resistivity logging response and of porosity logging response are made by using XXX horizontal well as examples.

In highly-deviated Wells and horizontal Wells, if physical property data fail to be measured in completion, casing compensated neutron data can be used to calculate the formation porosity.