TECTONIC STRESS FIELD IN THE DA'ANZHAI MEMBER OF THE LANGZHONG AREA,NORTHERN SICHUAN,AND FORECAST OF PETROLEUM ACCUMULATIONS

On the basis of a tectonic analysis, the authors have studied the basic characteristics of the tectonic field since the Mesozoic in the Da'anzhai Member of the Langzhong area, northern Sichuan.An attempt has been made to forecast petroleum accumulations in the Da'anzhai Member using the theory and method of oil expulsion, and present favorable areas of petroleum occurrence have been suggested. These provide reference for rolling petroleum exploration in the Langzhong area, northern Sichuan.