摘要
Abstract
Researches have shown that there exist not only large quantities of oil and gas, coal, coal-bed gas, groundwater and uranium deposits but also abundant oil shale resources in Ordos basins. Oil shale mainly occurs in Early Permian Shanxi Formation, Middle -Late Triassic Yanchang Formation, Late Triassic Wayaobao Formation, early Middle Jurassic Yan'an Formation and late Middle Jurassic Anding Formation. Oil shale usually assumes the layered form and lies at the depth of the basin. The major oil shale beds lie in both Yanchang Formation and Yan'an Formation. Oil shale was formed in paralic offshore in Early Permian, in terrestrial fades (deep or semi-deep lake) in Middle-Late Triassic, and in terrestrial fades lacustrine delta and lacustrine bog (associated with coal bed) in Late Triassic and early Middle Jurassic, and confined to terrestrial fades (semi-deep lake) in late Middle Jurassic. Oil shale is usually 4-36m in thickness, its oil-bearing rate is 1.5%-13.7%, and its apparent gravity is 1.55 -2.46, as revealed by an analysis of the oil shale in northern Tongchuan of Shaanxi Province and Tanshan of Guyuan in Ningxia. The shale oil resource amount (334) is over 2000 ×10~8 t, the burial depth is above 2000 m, and the proved reserves (121)have reached 1×10~8t, suggesting a great resource potential. The buried depth of the oil shale is shallow, the verified extent is high in some areas, and the traffic conditions are good. If the oil shale can be developed in time, not only the preliminary economic benefit will be acquired but also the valuable experience in exploiting oil shale will be gained in Ordos basin.关键词
油页岩/地质特征/资源/鄂尔多斯盆地Key words
oil shale/ geological characteristics/ resources, Ordos basin分类
天文与地球科学
