Effectiveness Evaluation Of Carbonate Reservoir Fracture In Hetianhe Gas Field

In this paper,on the basis of hotan river gas field,on the basis of well data and dynamic production data,the background of the formation of the ordovician evolution,combed the hotan river field ordovician stratigraphic distribution situation,on the whole the ordovician strata denudation extent increase from east to west.In central and eastern formation is relatively intact,in ordovician Santa group of residual thickness of 14.5⁴3.5 m;,on the western denudation degree,the largest in the ordovician were eroding^[1];Relatively high in geomorphology and eastern parts of the denudation extent relatively large 4 Wells,the ordovician residual only 7.0m?biological limestone section?.Through core observation,imaging logging data,statistical depth,the occurrence of the ordovician fissure,opening and fillings of information.Classification was carried out on the fracture properties,give priority to with shear joints,second sutures and solution pores,extensional least seam.On observation of fracture trends and inclination of the rose diagram of statistical classification,east to the north of the crack is given priority to,north west to The Times,give priority to with high Angle seam,low Angle seam.For the observation of crack opening,give priority to with less than 0.2 mm,0.2 0.6 mm.Of fracture fillings,mainly for filling,shale,gypsum and calcite is divided into five grades.Cracks according to the above characteristics,combined with field limited cutting relation of crack and core observation of crack filling rate,coupled with carbon and oxygen isotopes and fluid inclusions experiment,determine the crack formation.Autoclave of hydrothermal filling simulation device,for different fracture occurrence,fracture density and different fracture combination of rock samples under different concentration,temperature and pressure solution of crack dissolution filling experiment.To crack under the factors such as temperature,dip Angle,the opening of filling quantity statistics,it is concluded that the influence factors of filling.Comprehensive crack data,different lithologic layer test mechanical parameters,using petrel simulation,using the entropy weight method weight correction for different factors,the hotan river long axis shape work area.Calculate the porosity and permeability distribution of the ordovician.Then,the combination with the actual production data correction to finally cracks results effectively.Results show that the hotan river have two large gaps in the ordovician filling period,the late hercynian filling advantage azimuth for north west,give priority to with the whole filling and filling.Biological limestone section is given priority to with low Angle filling,MA2 and MA402 filling is not development.Oolitic limestone section of filling in western development,low degree of filling in the east.Early Himalayan filling for north east to advantage azimuth,give priority to with half filling and packing.Biological limestone section focused on filling MA8,MA5 1 and MA3,MA401,MA4 upside.Oolitic limestone section focused on filling MA2and near MA5.Vertical fracture connectivity,transverse shows three parts connected,in the western region,Ma5 wellblock,Ma4 wellblock.