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Design And Implementation Of Shale Gas Reservoirs Well Log Interpretation Software

Posted on:2015-01-20Degree:MasterType:Thesis
Country:ChinaCandidate:Y WanFull Text:PDF
GTID:2250330428469129Subject:Geophysics
Abstract/Summary:PDF Full Text Request
As a new type of natural gas resources, Shale gas is drawing more and moreattention. Geophysical well logging techniques for shale gas exploration anddevelopment are one of the important technologies. For decades, scholars achievedmany important results in the interpretation and evaluation of shale gas reservoirswith well logging data. By studying the technology and experience from abroad, aneeded suitable well log evaluation system which can process and interpret shale gaswell log data quantitatively is established. This software system could help speedingup shale gas exploration and development in China.In this thesis, the shale gas reservoir characteristics and common well logginginstrument series were summarized, and the well logging response characteristics ofshale gas reservoirs were also analyzed. The calculation methods of regular reservoirparameters were summarized. The existing methods of calculating total organiccontent (TOC) were investigated, and based on those previous methods, a newmethod of calculating TOC using two clay content was developed. The calculationmethods of adsorbed gas content and free gas content were summarized in this thesis.Based on the previous studies, the relationship between TOC along with the depth andadsorbed gas content was established, proposing a new calculation model of adsorbedgas content.Based on the previous and new methods and models, considering comprehensivecalculation parameters, a shale gas well logging interpretation software was writtenand compiled in Fortran program language and attached to the FORWARD platform.Use the software presented in this thesis, the lithology of the shale gas reservoir couldbe analyzed, and the porosity, permeability, organic maturity, TOC, adsorbed gascontent and free gas content and other parameters could be calculated.Through processing actual data, the calculated TOC results using variousmethods were compared with experimental data on the core calculation. The compareresult verified the reliability of the new method, and the effects of various methods and their application conditions were analyzed. While processing the actual data, theselection of the calculation method should be based on whether there is experimentalcore data as well as different logging series. With the new absorbed gas contentcalculation model presented in this thesis, the shale gas adsorbed gas content could beestimated only from the well logging data, without using the experimental data fromthe core. The adsorbed gas content calculation results by using the new modelcalculations and the results based on the previous core experimental data agreed well,and that proved the new model’s reliability. The well logging interpretation softwarecould be a useful tool of shale gas reservoir well logging interpretation.
Keywords/Search Tags:Shale gas, well logging, total organic content, gas content, interpretationsoftware
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