ANALYSIS OF GEOLOGIC FEATURES AND CONTROL FACTORS OF CARBONIFEROUS GAS RESERVOIR IN DINAN UPLIFT, THE JUNGGAR BASIN

By complicated analysis of volcanic core,casting thin sections,intrusive mercury curve of samples and porosity-permeability of gas reservoir in Dinan Uplift of the Junggar Basin,it suggests that the igneous rock reservoir has complex types.There are different reservoir spaces in various lithological igneous rocks,which mainly manifested as that the types of reservoir spaces are various and dominated by lithology,diagenesis and structural development.In a whole,the porous development is controlled by weathering crust and fracture.By an analysis of imaging logging,the more fractures are developed in the igneous rocks.By recognition of fractures,it is obtained that the orientation of these fractures are mainly north-east trending and are obviously controlled by near east-west trending regional major fracture.By an analysis of Carboniferous gas reservoir,it is considered that the faulting has improvement and destroying effect on igneous gas reservoir.That is to say,faults not only can improve reservoir property and provide dominant pathway for gas migration,also can destruct action on the cap rocks of gas reservoir.