US EPA

4966914 

Book/Book Chapter 

Origin Mechanism of Tightness of Chang 6 Sandstone Reservoir in Zhiluo Oilfield, Ordos Basin 

Zhang Rongjun; Geng Qian; Zhang Qian; Wei Hu 

2014 

AER-Advances in Engineering Research 

5 

878-+ 

WOS:000349473500196 

By the use of basic geological data, properties, cash thin section, SEM, particle size, high mercury injection and other core analysis experiments are completed to make a detail study on the Chang 6 group characteristics of Zhiluo oil field in diagenesis perspective. The results reveals that sandstone's petrography types are mainly gary or dark gray fine grain arkosic, the pore of which mainly consists of primary remanent intergranular pore and secondary induced pore. The mainly types of pore structure are subtle throat-coarser skewness and subtle throat-finer skewness. The type of reservoir is extra-low porosity and ultra-low permeability lithologic reservoir. Porosity have bad correlation with permeability. The density of lithologic reservoir is controlled by both deposition and diagenesis, and the later is the internal cause of the improvement of reservoir's property. Compaction and cemention reduces primary porosity 19.2% and 13.61%, respectively. Secondary induced pore due to dissolution increases porosity about 3.64% and make the property of reservoir better. The study provides a reliable basis for similar reservoir further exploration and development. 

Zhiluo oilfield; Chang 6 reservoir; property; diagenesis; reservoir