Abstract:

Intergranular pores, intragranular pores, micropores in interstitial material and crevicesare developed in Triassic and Jurassic reservoirs in North Tarim region, and the secondaryporosity of mixed intergranular pores, amounting to 43%-51% of total pore amount, is themain part of resrevoir spaces. Organic acids released by kerogen and clay mineral transformation affected the alumosilicate component and quartz anions in reservoirs. This is the principle cause for the formation of secondary porosity' The increased secondary porosity is up toabout 51.9% of the total porosity. Besides, the reservoir property is also controlled by burialdepth, unconformity and the passage formed of "Y"-type faults.