Abstract:

After looking back the oil and gas exploration history and summarizing the geological understanding, engineering technology and important exploration results in the Hailar basin since the 1950s, the exploration process of the Hailar basin can be divided into four stages, namely regional exploration for oil and gas discovery, structural reservoir exploration for breakthrough, fault-block reservoir and lithologic reservoir exploration for reserves increase, and multi-type reservoir exploration for further expansion. Many years of exploration practice proves the following conclusions: (1) Every innovation in understanding and every change in thinking bring new portunities to exploration; (2) Breakthrough to key seismic technologies can effectively improve geophysical imaging quality and lay a foundation for deepening understanding of complex structural zones in complex faulted basins; (3) The prototype basin controls the formation and evolution of source rocks, and the structural belts in sags control the migration and enrichment of oil and gas, so that the optimal selection of major sags and the clear understanding of reservoir forming controlled by faults and structures are the basis and key points guiding exploration; (4) Understanding oil and gas enrichment laws in subsag-slope zones allows the changes of exploration ideas and expansion in exploration field and space; (5) The innovation in the understanding of geological theory is fundamental for widening exploration field and making sustainable discoveries, and it is also helpful to broaden our mind and encourage innovation in future exploration.

Key words: Hailar basin, exploration stage, exploration enlightenment, prototype basin, fault-controlled reservoir, structure-controlled reservoir, subsag-slope zone