Gas hydrate reservoir parameter evaluation using logging datain the Shenhu area,South China Sea
Received date: 2016-04-11
Revised date: 2016-09-27
Online published: 2017-01-10
The Shenhu area,northern South China Sea,has experienced a complex tectonic evolution process,full of faults,and the vertical distribution of gas hydrate zone is obviously discontinuous and uneven.Estimating formation porosity and hydrate reservoir saturation and other parameters using logging data has great significance for further study of reservoir distribution characteristics and selection of high quality reservoir.Based on resistivity and sonic logging data,several estimation and correction methods of porosity were discussed.Then,gas hydrate saturation of Well SH2 in the Shenhu area of South China Sea was studied and evaluated quantitatively.It is shown that when considering the effect of clay content and hole diameter change,the porosity estimated by density method should be corrected appropriately,and the mud-modified resistivity method can more accurately describe the hydrate saturation.Besides,the selection of rock-physics models in velocity method is one of the most important factors affecting the inversion saturation.Four-phase Wood equation and effective medium theory have certain advantages and deficiencies,and a modified Wood equation is got by the combination of above two models.The hydrate saturation calculated by the modified Wood equation is well consistent with the estimated results by chloride ion concentration anomaly.The consistent results of different evaluation methods indicate the general distribution of gas hydrate,and it is estimated that the thickness of layer along Well SH2 where hydrate saturation is greater than 20% is about 22m,and the maximum concentration is about 23%.
Key words: Natural gas hydrate; Porosity; Saturation; Resistivity; Rock physics modeling; Shenhu area
Liu Jie,Zhang Jian-zhong,Sun Yun-bao,Zhao Tie-hu . Gas hydrate reservoir parameter evaluation using logging datain the Shenhu area,South China Sea[J]. Natural Gas Geoscience, 2017 , 28(1) : 164 -172 . DOI: 10.11764/j.issn.1672-1926.2016.11.031
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