【摘要】 中国中西部地区前陆盆地油气资源丰富,加强前陆盆地新勘探领域的研究具有重要意义。前陆盆地油气勘探多集中在挤压背斜构造、岩性圈闭、生物礁、披覆背斜、地层圈闭和断块圈闭6类勘探区,其中以挤压背斜构造为主,但其勘探难度越来越大。参考近年来全球前陆盆地领域油气勘探重大成果的实践经验,结合中国前陆盆地领域油气勘探新突破的趋势,提出了造山带变质岩推覆体之下的"隐伏层序"、前陆冲断构造的"下盘冲断夹片构造"、前陆坳陷部位深层等三个潜在油气接替区,并预测此三个接替区与前陆坳陷层序具有相同的油气地质条件,有着较大的油气勘探潜力。造山带变质岩推覆体之下的"隐伏层序"发育有成盆期沉积层序;前陆冲断带"下盘冲断夹片构造"上覆地层封盖性能好、断层涂抹系数高,具有良好的储盖条件;前陆坳陷深层领域提供了优质的储集层、有利烃源岩以及晚期发育的膏岩层或致密泥岩封盖层。勘探实践证实此三个接替区具有广阔的勘探前景。更多还原

【Abstract】 The foreland basins of the central and western region of China are rich in oil and gas resources,so strengthen the research on the new exploration regions of foreland basin is important. Oil and gas exploration in foreland basins is more concentrated in six districts of the extrusion anticline structure,lithologic traps,reef,drape anticline,stratigraphic traps and fault traps. The extrusion anticline structure is the major style,but its exploration is more and more difficult. Reference to the important great discoveries in global exploration and combined with the new trend of exploration breakthrough in foreland basins domain of China,this paper brings forward three potential replacement regions of hydrocarbon reserves,which is "the concealed sequences" under the metamorphic rock thrust nappe of orogenic belt,"the footwall thrust clamping piece structures" of the foreland thrust belts,the deep formation of the foreland depression. The three potential replacement regions of hydrocarbon reserves have biggish hydrocarbon exploration potential and have the same petroleum geological conditions to the foreland depression sequences. "The concealed sequences" under the metamorphic rock thrust nappe of orogenic belt developed the basin-forming period sedimentary sequence. "The footwall thrust clamping piece structures" of the foreland thrust belts have favorable reservoir and seal condition. The deep formation of the foreland depression provided high quality source rock and reservoir. Exploration practices approved that these three potential replacement regions of hydrocarbon reserves have widely exploration prospect.更多还原