关键词: 双相沉积盆地, 古老变质岩基底, 第二深度空间, 深层潜在油气藏, 地球物理勘探

Abstract: On the basis of dual-phase sedimentary basins in China and foreground of deep lithologic and stratigraphic potential oil and gas in Northeast China, we must hold the sedimentary construction, undulations of crystalline basement, distribution of volcanic rocks and spatial distribution of different lithofacies in the shallow and deep area of the oil and gas basin in the whole region. Especially, on the guidance of new conception, we should break the existing framework to reregionalize the hydrocarbon prospects and study the deep dynamical process of the hydrocarbon generation and distribution of reservoir space. So revealing the structure of the sedimentary layer and crystalline basement and studying the deep dynamic response of crust and mantle are very important to discover the large and super large potential oil and gas fields in our country. Through analyzing the distribution of oil and gas resources at home and abroad and studies in the process of industrialization and economic development, we suggest that we must be established in mainland and strengthen establishment of save, reliable and sustainable development reserved energy base while multivariate sharing the world sources. Base on analyzing and studying the hydrocarbon reservoir, sedimentary construction and crystalline basement of sedimentary basins in China, we discover that there exist the marine sediments beneath the continental sediments widely, i.e, dual-phase sedimentary basins (continental phase and marine phase). Here the basement is not the bottom of Mesozoic and Cenozoic basement, but is the old metamorphic rocks basement, i.e, the top of crystal crust. From the information mentioned above and several examples of the sequences of dual-phase sedimentary basins, we consider that exploration of oil and gas sources has a broad space in deep part. Carrying on high-resolution investigations in the dual-phase sedimentary construction, volcanic rock distribution, old crystalline basement and deep process and dynamics response of the formation of hydrocarbon and basins are necessary to discover new hydrocarbon reservoirs in the deep area and around oil filed (e.g. Daqing) and improve the potential space of hydrocarbon reservoir in Northeast China. Finally, we propose the dispositions and suggestions for finding out the dual-phase sedimentary construction, old crystalline basement, volcanic rock distribution and geophysical exploration of the second-depth space (5 000-10 000 m) and overall planning in Northeast China.

Key words: dual-phase sedimentary basins, old metamorphic rocks basement, second-depth space, deep potential hydrocarbon reservoir, geophysical exploration