Abstract:

Oil shale is becoming a research hot point with decreasing increasingly in hydrocarbon resources at present. There are abundant oil shale resources in Ordos basin. Oil shale resources in Ordos basin account for 60% of that in middlewest China and rank the first among all basins in China. The main bed of oil shale is the upper part of  lower segment of Yanchang Formation （Ty）, and  was formed in late stage of Middle Triassic period. According to field observations, the outcrops of oil shales are mainly distributed in TongchuanYijunHuangling. The thickness of main ore beds is generally 2-36 m. The oilbearing ratio range is from 1.8% to 13.7%;caloric value range is from 1.66 to 11.45 MJ/kg and type of  kerabitumen is I-II₁; ratio of hydrocarbon-producing is 400 kg/t（moderatebetter）. The proved resources amount is around 100×108 t and reserves amount is closely 1  ×108 t in this area. It is pointed out  that oil shales were formed in depositional environment with fresh water,nearshore,powerful reduction,rich content of organic material according to different data and belong to semi-deep lacustrine facies in  large inland lake. The burial of oil shale is shallow; reserves of oil shales are large;and traffic condition is advantageous in the area. If  oil shales are well developed, not only preliminary economic benefits may be acquired, but also precious experience in developing oil shale  in Ordos basin may be gained. Besides, oil shales in Tongchuan-Huangling are the nearest to Xi-an, having great significance for developing.

Key words: oil shale, geological characteristic, development and utilization, Tongchuan-Huangling district, Shaanxi Province