新疆风城地区油砂地质特征及成因浅析

ORIGIN ANALYSIS AND GEOLOGICAL CHARACTERISTICS OF OIL SANDS IN THE FENGCHENG AREA,NORTHWEST JUNGAR BASIN

据新一轮油气资源评价显示,油砂资源在国内众多盆地皆有分布,其中以准噶尔盆地西北缘风城油砂性质最好。虽然在该区的钻探已取得了较大的进展,但整体而言,其勘探程度还相对较低。通过大量岩心、薄片观察和储集物性资料分析,对风城油砂的储层特征进行了整体评价,分析认为上部白垩系地层与下伏地层相比,具有孔隙度大、含油率高及油砂分布面积广等特点,其河道心滩沉积是有利的油砂储集体,可作为下一步勘探开发的重点目标区。另外,通过对盆地西北缘油砂油藏的地球化学性质演化研究,探讨了油砂油的成因类型,为进一步勘探和开发丰富的油砂资源提供了有效依据。

According to Chinese latest statistics on hydrocarbon resources assessment,oil sands resource is distributed in many basins in China,with best property especially in the Fengcheng area of the northwestern Jungar basin.Although drilling and exploration here have made some progress,the degree of exploration in this area is still low.Through analysis on a great number of core samples,thin-section observation and reservoir physical property,this study evaluated thoroughly on the reservoir features of oil sands in the Fengcheng area.The result showed that compared to the underlying formations,the upper Cretaceous formation was characterized by large porosity,high oil-bearing rate,and wide oil sands area,and the river channel bar was the favorable reservoir as the important target for further exploration in this area.Moreover,according to study on geochemical characteristics for oil sands in the northwestern Junggar basin,this paper also discussed on the origin types for oil sands and afforded effective proof for further exploration and development in the Fengcheng area.