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下扬子区是南方海相具有油气勘探远景的地区之一。应用新增的勘探资料,采用新的技术方法,结合野外、室内综合研究,分析烃源岩构造—热演化。研究结果表明,晚印支—早燕山期,下扬子区的构造运动以逆冲推覆为主,大部分地区遭到抬升剥蚀,部分地区下古生界烃源岩抬升后晚期没有再度深埋,保留了印支期的热演化状况,因此下古生界高成熟腐泥型烃源岩现今仍具有一定的生烃潜力。在演化程度普遍较高的下扬子区下古生界,找到局部热演化程度相对较低,具有油气勘探前景的地区和层位是可能的。
The Lower Yangtze region is one of the areas in the southern ocean that has the prospect of oil and gas exploration. By using the new exploration data and adopting new technical methods, combined with field and indoor comprehensive research, the tectonic-thermal evolution of source rocks is analyzed. The results show that the tectonic movements of the Late Indosinian-Early Yanshanian and the Lower Yangtze are dominated by thrust nappe, most of them are uplifted and eroded, and the lower Paleozoic source rocks in some areas are uplifted and are not deeply buried later , Retained the Indosinian thermal evolution. Therefore, the Lower Paleozoic high-maturity sapropelic source rock still has some potential for hydrocarbon generation. In the Lower Paleozoic of the Lower Yangtze region, where the evolution degree is generally high, it is possible to find areas and horizon with relatively low degree of local thermal evolution and potential for oil and gas exploration.