Font Size: a A A

The Research Of High-precision Reservoir Porosity Inversion Method

Posted on:2015-11-22Degree:MasterType:Thesis
Country:ChinaCandidate:X LvFull Text:PDF
GTID:2180330467467577Subject:Applied Geophysics
Abstract/Summary:PDF Full Text Request
Sulige gas field is currently the largest natural gas field in our country,theexploitation of this area has significant foreground and meaning.ButSulige gas fieldis a “three lows”lithologic gas reservoir,its development has a certaindifficulty.Ingeneral,when we find sandstone we find reservoir.ButSulige gas field hasstrong heterogeneity,so we need to research the distributionof porosity to findeffective reservoir.Considering the characteristics of the region and porosity prediction methodchoice.In this paper,the main target is predict porosity in He-8member,studieddouble wave method、The adaptive weighting method and stochastic inversionwhichbased on statistics for the application of porosity inversion,and base on the doublewave method we proposes a porosity prediction adaptive weighting method.the mainresearch and key results of this paper are as follows:1.We made a comprehensive summarize of stratigraphic division, sedimentaryfacies, the distribution of sand bodies,structuralfeature,reservoircharacteristics,gasreservoir of Sulige gas field.2.In double wave method part,we discussed how to eliminate the zero value ofporosity effect on the statistic formula.and then we introduce gamma inversion resulttorestrain the distribution of sand body,it is not onlysolved this problem but alsoconvenience the study of porosity distribution in the sand body.finally,we get aformula which is appropriate for He-8member and inversion sections.3.Combining previous weighting average method of porosity prediction andMultiple linear regression method,we put forward and applied a kind of adaptiveweighted methods to predict porosity and matching a linear relation between p-wavevelocity、s-wave velocity、gamma value and porosity.4.Discussed how to use Stochastic inversion method whichbased on impedanceinversionto do Porosity inversion, and achieved a relatively good porosity predictionresult.5. Compare the porosity inversion method inversion results in Sulige regionHe-8member,we find that the double wave method is the best of this threemethods.Itshows the anisotropism of Sulige gas field, has a great effect. In conclusion,the double wave method,adaptive weighted method and stochasticinversion method have achieved good application effect,improved the precisionofreservoir recognition, hasimmediate practical applications.
Keywords/Search Tags:Porosity inversion, The double wave method, Stochastic inversion, Gamma inversion
PDF Full Text Request
Related items