STUDY ON THE CHARACTERISTICS OF TIGHT SANDSTONE RESERVOIR IN BENXI FORMATION OF ORDOS BASIN, CHINA

On the basis of some related paper of Benxi Formation of Ordos Basin, this paper mainly introduces the reservoir characteristics of Benxi Formation gas reservoir in the Ordos Basin. The paper concludes that (i) Benxi Formation can be subdivided into three Members: first Member, second Member and third Member; (ii) Quartz sandstone is the main rock type, followed by lithic quartz sandstone, and the reservoir pore types are mainly residual intergranular pore and dissolved pore, followed by intercrystalline pore, with a small amount of micro-fissure. (iii) Reservoir physical properties of Benxi Formation are relatively poor, with the average porosity being 6.33% and the permeability being 1.37x10(-3) mu m(2) in average. (iv) Reservoirs can be divided into 3 types in the study area, namely type I, type II and type III, and type I reservoirs and type II reservoirs account for the main reservoirs in the study area. The main purpose is to have a more intuitive understanding of the reservoir characteristics of Benxi Formation of Ordos Basin, and a more holistic grasp of the distribution and enrichment of gas reservoirs.