江汉平原印支期以来的盆山耦合关系及下古生界油气响应

利用构造地质学和油气系统理论，以盆地构造-沉积分析技术为手段，研究了印支期以来江汉平原与周缘造山带的耦合关系，探讨了江汉平原的构造演化及其对油气成藏的控制作用。印支期以来江汉平原及周缘经历了挤压、拉张、挤压3次大的构造应力场的转换，使古生代海相碳酸盐岩沉积为主的盆地具有改造盆地的特点；一方面强烈的抬升、剥蚀使早期聚集的油气经历改造和再分配、再聚集过程，另一方面燕山期构造活动使逆冲推覆构造成为该区重要勘探领域。综合分析表明，位于台、盆转换带的宜昌-珂理-簰州区带是目前江汉平原及周缘下古生界油气勘探的有利地区。

Basin - mountain coupling relationship and oil-gas response in lower Palaeozoic since the Indo-China epoch in Jianghan Plain

Based on theories of tectonic geology and petroleum system,and guided by basin structure and sedimentary analysis,the author studied the coupling relationship between Jianghan Plain and its adjacent orogenic belt since the Indo-China epoch,and discussed the tectonic evolution of Jianghan Plain and its controlling function on oil-gas reservoir formation.Ever since the Indo-China epoch,the study areas have undergone a significant transition of tectonic stress field from compression to extension and to compression again for three times,which makes the basin with the dominant deposition of the Paleozoic marine carbonate rocks have the characteristics like those of reformed basins.On one hand,intensive uplift and erosion result in reformation,redistribution and re-accumulation of early accumulated oil and gas;on the other hand,the overthrust decken structures become the important exploration targets in this area because of Yanshan Tectonic Movement.An integrated investigation indicates that the Yichang-Keli-Paizhou zone,located in a platform-basin transitional belt,is a favorable exploration area for the lower Palaeozoic hydrocarbon in the Jianghan Plain and its adjacent areas.