After 30 years of practices

the overall concept of exploration in Biyang depression had been thoroughly changed by returning back to the prolific maturing blocks in the depressions at the end of the Ninth Five-Year Plan.Further geological study shows that the shallow complex fault block reservoirs in the north slope zone have great exploration potentials because of its favorable conditions for hydrocarbon pooling.In view of the shallow burial depth and complex fault block structures in the slope zone in northern Biyang depression

3-D seismic exploration had been adopted to preserve the shallow reflections.Apart from that

thermal testing was also implemented in the economic evaluation of heavy oil development.As a result of years of exploration in the zone

many oil-bearing traps has been discovered and reserves has been significantly increased

making the slope zone the key area for reserves and production growth in Henan oilfield for the Tenth Five-Year Plan or even longer period.