【摘要】 <正> 鄂尔多斯盆地北部以上古生界为目的层的石油普查勘探工作,自1953年迄今已近30年,1955—1964年,经地质部和石油工业部几番工作,在乌兰格尔及其南侧地区共打井300余口,除白垩系见多处油苗外,有40口井见二叠系石盒子组及石千峰组含油,但仅个别井获少量原油.因成效不大,1965年后,一度中断工作。1969年,石油工业部在盆地西部灵武地区所钻刘庆1井于太原组、山西组、石盒子组中发现高产工业气流,复又引起人们对此区的极大关注。 1975年,地质部重上盆地北部,开展了区域地震概查工作,钻普查井11口,其中伊深1井获日产上万立方米的天然气及少量原油,石咀山以南的巴彦套海地区上古生界首次发现油气显示(伊3井),更多还原

【Abstract】 Ordos basin was part of the North-China platform in the early Paleozoic,while the western Qilian geosynelins was located on oceanic crust.In betweenthem,there was a trunsitional continental slope inclined westward.Thistectonic setting had played a evident part in controlling the formation of mar-ginal depression in western Ordos from Paleozoic to Jurassic.The hinge lineof the westward dipping continental slope mightbe located at about 10°E.Carboniferous sediments of "depression type"are developed to the west of 1I7°Ealong the mid-north segment of the west margin ordos basin,and farthereast are sediments of “wide-spread type”The later distributed widely in the northern Ordos basin are less worth oil and gas prospecting.The hinge zoneis lithologically developed with various transitional facies and altenated eachother where the best association of oil source and reservoir rocks may occur.More-over,oil and gas.originated in the marginal depression might have migrated to-ward the eastern area since the Late Paleozoic.So,there should be an area ofgood hope for oil and gas prospecting.更多还原