Reservoir development regulations of Ordovician carbonate formation in Yubei area

After multiple stages of tectonic movement, the Yubei area is featured by complicated tectonic pattern and strong reservoir heterogeneity. Based on the formation evolution in depression area, it was analyzed in this article the relations between well location and reservoir development, by comparing resistivity value and seismic coherence characteristics among depression, slope and broken ridge belt in limestone of the Yijianfang and Yingshan Formations. By means of logging data, imagine data and formation test data, we studied the relationship between dolomite degree and reservoir in dolomitic limestone of the Yingshan Formation and dolomite of the Penglaiba Formation. For the limestone formations, reservoirs were well-developed in broken ridge belt and poorly-developed in depression and slope. For the dolomitic limestones and dolomite formations, reservoir developments were related to dolomitization degree.