志丹探区侏罗系—上三叠统沉积环境和沉积相

Sedimentary Environment and Facies of the Jurassic to Upper Triassic in the Zhidan Exploration Area

通过野外地质剖面勘察、钻井取心观察与描述收集了大量的第一手资料，并在此基础上结合古生物化石、沉积韵律、沉积厚度及岩电组合等特征，对位于陕甘宁盆地东部斜坡带上的志丹探区进行了沉积相研究。通过沉积相类型的划分和沉积环境分析发现：湖相泥岩是良好的烃源岩；河道砂体、三角洲前缘和三角洲平原分流河道砂体是主要的储集体。

The Zhidan exploration area is situated in the east shelving of the Shaan Gan Ning basin.Numerous firsthand information was gathered through examinating the geological field cross section, and the drilling core was obtained and described, and on the basis of which a study is made on the sedimentary faeies in combination with the characters of the fossil,the sedimentary rhythm and thickness and the rock electrics assemblages ect.Throuth the division of the sedimentary fecies and the analysis of the sedimentary environment,it was found that mudstones of deep lake are good hydrocarbon soure rocks,and river channel,delta front and delta plain distributary channel sand bodies are good reservoirs.