The Research Onsandy Conglomerate Reservoir Characteristics Of Permian Jiamuhe Formation Of The Southern Slope Of Zhongguai Uplift

It is deep(4600m~4800m)that the buried depth of tight sandy conglomerate reservoir of Jiamuhe formation of the southern slope of Zhongguai Uplift,with not only tight lithology,but also high heterogeneity,and there is no thorough category of this area's reservoirs,furthermore,the controlling factors of the reservoir is still not clear.The problems above seriously limited the exploration of tight sandy conglomerate reservoir of this area.By single well facies analysis(core,casting thin sections),comparison between wells,fan delta facies is considered to be the oriented facies of Jiamuhe formation,which deposits large sets of thick sandy conglomerate,and then summed up the deposition model,precisely depicted the characteristics of sedimentary facies of the vertical three sand groups of the second member of Jiamuhe formation.The lithology and pore structure of reservoir rock has been studied by using data from core,casting thin section observation,electron probe,mercury-injection curve.Total feature of lithology is coarse fraction,low component maturity,medium structure maturity,low muddy matrix content,and general high content of laumontite;primary pore is little,while secondary pore is oriented.There mainly developed three kinds of reservoir space: porosity,porosity-fissure and fissure.Given thought to the relationship between laumontite level and reservoir physical property of Jiamuhe formation in research area,Low-pressure perfusion method,permeability – porosity regression method,face rateof casting sections method were taken to correct reservoir physical property measurement error caused by laumontite.The laumontite level is the conclusive controlling factor.Selected data of porosity,permeability,reservoir types,the diagenetic facies types,reservoir physical property in research area was divided into three classes,and an advantage zone of reservoir was forecasted.