In order to further strengthen exploration in China's mature oil and gas regions

researchers studied the distribution of oil and gas reservoirs and residual oil and gas resources in petroliferous depressions and proposed that the key formations as well as those underlying and overlying them in the potential zones of these depressions be the future targets of refined exploration.Based on the analysis of exploration experiences in mature oil and gas regions

they put forward a new idea of refined exploration and established a set of approaches and technologies(including identification and protection of oil and gas layer

prediction of oil and gas reservoirs

oil and gas production enhancement

and etc.) aiming at different kinds of reservoirs and pools.Their wide application has resulted in large reserve growth.Compared with exploration in offshore and frontier areas

refined exploration in mature oil and gas regions has lower cost

shorter period of capital recovery

and higher economic returns.