Characteristics And Resource Evaluation Of The Mesozoic Oil Shales In Binxian-Tongchuan, Ordos Basin

Mining area of oil shale of Binxian,Tongchuan is in Binxian,Tongchuan County of Shangxi province. tectonically located at the Weibei uplift belt of Ordos Basin.Mining area of oil shale of Binxian including Zhanghong and Shuibei exploration area. Mining area of oil shale of Tongchuan including the exploration area of Hejiafang,Lieqiao,Ta, nihe and Yaoqu.oil shale of Binxian is black in color,It is platelike shape and developed joints, oil shale in weathered is brownish yellow,grey black in color and it is platelike shape. Fresh ore is shining black and massive. It tastes like asphalt in combustion process. It Possesses oily luster and thin bedding. It is hard and compact. The main components is hard clay,quartz-scheelite and detrital feldspar.Occurrence horizon of oil shale of Binxian is the third member of Yanchang Formation in the upper layers of the Triassic.Spatial distribution of oil shale is stratified. The distribution is stable,the occurrence is monoclinal structure.buried depth is less than 500m.There is three stratigraphic horizon in mining area of oil shale including,only A1 has value of industry. The oil content of A1 is not high,but it is Stability. Content of the ash content and volatile is high. Organic carbon is more than 7.5%, the moisture is no higher than 2.31%,the sulphur share is lower than 3.85%, oil shale is normal.The high-grade center of oil shale is coincide with the high value area of oil shale. The sedimentary thickness and The oil content has declining trend from south to north, in the area of outcrop formation,the value of oil content becames lower from east to west, and the thickness becames becames lower from east to west from east to west. The trend is slow.oil shale of Tongchuan is brown black,purple black,jet-black in color. Platelike shape like plate,pages,paper. It have oily luster. It is brittle,soft and inflammable. There is mixed kinds of fracture. The occurrence is gentle. It has shallow buried depth .The maximum depth is 250m,the range of The oil content is 5%-7%, the maximum is 9.10%, the Lowest is 3.5%. ash content is more than 70 %, the sulphur is high,the weight is 1.90 t/m~3. Occurrence horizon of oil shale of Binxian is Yanchang Formation in the upper layers of the Triassic. Only the middle Part of T3y3 has value of industry. The oil shale is thick,distribution stable,great variation in thickness.Through comparing,oil shale of Binxian,Tongchuan is brittle,soft,platelike shape and developed joints.the moisture of oil shale of Tongchuan is high.the highest moisture is Linkou. The char and ash content of oil shale of Binxian,Tongchuan is high,the moisture,tar,oil content and losses+ oil and gas is common.So the quality of oil shale with high ash is common.Mining area of oil shale of Binxian is semi-deep lake facies,the Partial Section is shallow-lake facies. Mining area of oil shale of Tongchuan is shallow-lake facies, Genetic type of oil shale of Binxian,Tongchuan is mixed type. (sapropel and humic,humic and sapropel)The conditions of generation of oil shale have structure,sedimentary environment,organic matter.Ordos Basin is a large multicycle superimposed basin, developed on the basement of early Proterozoic crystalline basement. Itsevolution progress had undergone four developed stages,i.e.middle-late Proterozoic aulacogen basin,Paleozoic craton basin,Mesozoic forelandbasin and Cenozoic fault-depression basin in its adjacent region. Tectonic evolution of basin is Multi-stage,and Mining area of oil shale of Binxian,Tongchuan is in southern edge of Ordos Basin, tectonically located at the Weibei uplift belt of Ordos Basin. Anticline and syncline is develop,broad and gentle. Structure is simple,There tectonic Conditions impel the generation of oil shale.Petroleum system of Ordos basin is one of the best development period in the late of triassic. the Yanchang Formation in the upper layers of the Triassic is the the golden ages,The evolution process of formation,development and extinction in lake basin is recorded.the Yanchang Formation in the upper layers of the Triassic is the main Occurrence horizon.The oil shale of Binxian,Tongchuan is semi-deep lake facies,shallow-lake facies.The characteristics is rich material source,deep lake basin,Stable water flow,gentle oscillation. The oxidizing milieu transformed into reducing environment. The good environment for the generation of oil shale has been created by the characteristics.In the shallow lake, semi-deep lake sediment environment, with the Warm and humid climate, lush terrestrial plants, aquatic life and development, In the basin under the conditions of stability, Oil shale of the original material gathered and deposited down. In a hypoxic environment and through microbial activity, Organic matter was deoxidized and degraded, the ultimate form of oil shale and preserved under the condition of a certain temperature, pressure and stratum.After calculation,the resources reserves of oil shale in Binxian is 609.9 million tons;the exploitable reserves of oil shale technology is 241.89 million tons; the exploitable reserves of shale oil is 37.76 million tons; the exploitable reserves of shale oil technology is 15.54 million tons;the recoverable resource extent is 11.66 million tons.The resources reserves of oil shale in Tongchuan is 925.78 million tons;the exploitable reserves of oil shale technology is 357.04 million tons; the exploitable reserves of shale oil is 58.78 million tons; the exploitable reserves of shale oil technology is 23.18 million tons;the recoverable resource extent is 16.65 million tons.