柴达木盆地德令哈地区侏罗系成岩作用研究

柴达木盆地德令哈地区侏罗系勘探程度较低，为了弄清其有利储层的分布规律，在野外地质踏勘、微观显微镜观察及分析化验的基础上，认为这一地区重要的成岩作用类型有压实作用、胶结作用及溶解作用。其中压实作用是造成其岩石孔隙体积减小的重要因素；早期的碳酸盐胶结作用不仅可以固定岩石骨架保存原生孔隙，而且可以促进次生孔隙的发育，当碳酸盐胶结物质量分数小于15％时易产生有利的次生孔隙。

Study on diagenesis of Jurassic reservoir in Delingha area of Qaidam Basin

Low degree exploration is the actuality of Delingha area in Qaidam Basin.In order to find out the distribution rules of the advantaged reservoirs in the area,this paper concludes that the important diagenesis types in the area is compaction,cementation and dissolution based on field reconnaissance,core observation and microscope analysis.Compaction has played an important role in pore reducing.Cementation in the early stage can not only fix up the rock framework in order to conserve primary porosity,but also can improve generation of secondary pores if the content of carbonate cements is lower than 15%.