试论波斯型地洼区的特征及其与油气形成的关系

波斯湾地区面积仅占世界大陆与大陆架总面积的1.85%.为何却集中了迄今所知的世界油藏的一半以上?本文以历史因果论大地构造学的观点为基础。分析了波斯湾地区成油的大地构造背景.认识到该区为一有利于油气生成的波斯型地洼区.并通过对该种类型地洼区演化特征与油气形成关系的研究,认为该区油气田的时空分布受两个地洼区的演化和构造热动力事件控制.指出该区油气形成是因为具有丰富的生油物质,良好的生、储、盖组合,巨大的圈闭储集构造,合适的成油构造热动力.高效的运移作用和恰当的构造保存条件,并由于这些最佳的生、储、盖、圈、运、保条件集于一区的结果,而使本区成为世界石油之冠。

CHARACTERISTICS OF THE PERSIAN-TYPE DIWA REGION IN RELATION TO OIL-GAS FORMATION

The area of the Persion Gulf district is only 1.85 percent of the continents and continental shelves in the world, but why does the half of the oil fields which we know in the world concentrate on the Persian Gulf district? On the basis of the historistie—causationist tectonic viewpoint, the article makes a conclusion that the district is a Persian-type diwa region which is bonefical to oil-gas formation after analysing the geotectonic setting ofoil formation in the Persian Gulf district. Throught the study of the association of the evolutional characteristics of the Persian-type Diwa region with oil-gas formation. It finds that the time-space distribution of oil-gas fields is cxontrolled by the evolution of two diwa regions and tectonic-thermodynamic events, and points out that the oil-gas fields arc formed in the district because they possess plentiful oil-generating matter, good source-reservoir-sealing rock assemblages, great trap-reservoir structures, fitting tectonic-thermodynamics for oil formation, efficient migration and suitabl;e conditions for tectonic reservation. These best conditions getting together result in the district topping the world.