东秦岭—大别造山带南部海相地层油气勘探潜力及选区方向

东秦岭—大别造山带与其南侧毗邻盆地,是在统一的地球动力学背景下形成的复杂构造系统,共同构成造山带南缘逆冲推覆系.震旦—志留纪为典型的被动大陆边缘盆地.晚古生代至早中生代经历了早期裂谷盆地、被动大陆边缘、前陆盆地演化阶段,至晚中生代—新生代发生块断造山.多期、多类型原型盆地的横向并列、纵向叠加奠定了油气成藏的物质基础,并提供了多种勘探领域.区内前陆冲断构造带勘探潜力大,油气成藏条件优越,后期改造程度弱,应着重从"内幕型"、"影子盆地型"、"非常规型"气藏等不同领域进行选区,力争实现勘探突破.

Potentiality and strategic selection plays of petroleum exploration in marine strata nearby southern margin of east Qinling-Dabie orogenic belt

The complex tectonic system of East Qinling-Dabie orogenic belt and its southern basin has been formed in uniform earth dynamic background.The margin of East Qinling-Dabie orogenic belts has developed typical passive continental edge from Sinian to Silurian,and early rift basins,passive continental edge,and forland basin from Neopaloezoic to early Mesozoic,finally block-faulted orogenic during Neomesozoic and Cenozoic.Different kinds of prototype basins have been supplied with kinds of realms to explore,through developing formations of transverse juxtaposition and longitudinal overlap for the foundation of reserve substance.The forland fault-thrusted belts are thought of large exploration potentiality for the petroleum reserve and weak tectonic transformation.The direction to strategic selection plays of petroleum exploration should focus on 3 different realms to realize for breakthrough:marine "lowdown type","shadow basin type",and "unconvention type " in the region.