By means of core and thin-sections observation, and combined with the data analysis on reservoir physical property, grain size, X-diffraction, and inclusion temperature, the reservoir characteristics are analyzed and the influence of diagenesis on the reservoir property is studied quantitatively, then the influence factors on the reservoir is further discussed. This paper shows that the reservoir space of Ahe Formation is consisted mainly of matrix micropores, and secondary of particle dissolved pores, intragranular dissolved pores, intergranular pores and intergranular dissolved pores. It is a typical ultra-porous and ulatra-low permeable reservoir with an average porosity of 7.9% and permeability lower than 1 × 10- 3μm2. The lithology of the reservoir is the material foundation for the development of reservoir. The compaction is the main reason accounting for the reduction of porosity, and then the cementation. The dissolution and mineral conversion can improve the reservoir physical property to some extent, and different relief of structures can cause the variance of diagenetic stage, thus, the physical property in the east is better than that in the mid-west of the northern slope in Yangxia district. In the anticline juncture, the porosity and permeability are both increased. While in the anticlinal flank where micro-fractures are developed, though the porosity is increased, the permeability doesn’t change much. The study on distribution of favorable reservoir, its tectonic position and controlling factors are of great theoretical significance to the oil and gas exploration in this area.
Liu Weihong Gao Xianzhi Lin Changsong Wang He Ye Xinlin Ran Qigui . Reservoir characteristics and controlling fractors of Lower Jurassic Ahe Formation in Yangxia area，Kuqa depression[J]. Chinese Journal of Geology, 2017, 52(2): 390-406.