GAO Ming, CHEN Guojun, ZHANG Jin, ZHANG Xiao, ZHANG Fan. Porosity Calculation Method of Volcanic Reservoir Constrained by Natural Gamma Logging[J]. Offshore oil, 2021, 41(4): 43-48. DOI: 10.3969/j.issn.1008-2336.2021.04.043
Citation: GAO Ming, CHEN Guojun, ZHANG Jin, ZHANG Xiao, ZHANG Fan. Porosity Calculation Method of Volcanic Reservoir Constrained by Natural Gamma Logging[J]. Offshore oil, 2021, 41(4): 43-48. DOI: 10.3969/j.issn.1008-2336.2021.04.043

Porosity Calculation Method of Volcanic Reservoir Constrained by Natural Gamma Logging

  • The lithology of volcanic rocks is complex and changeable, and the chemical composition of different lithologies varies greatly, and the heterogeneity is strong. Its skeleton parameters often change frequently. In the conventional method of calculating porosity with fixed skeleton parameters, the skeleton parameters are often difficult to determine, resulting in great calculation errors. In view of the difficulty in evaluating the porosity of volcanic reservoirs, this article selects the natural gamma logging values which have good correlation with rock skeleton density, are sensitive to lithological changes, are low-cost, and are actually easy to obtain to establish natural gamma logging values that vary with depth. The gamma continuous variable framework model is used to calculate porosity of the reservoir. This method realizes continuous quantitative characterization of the porosity of volcanic rocks and solves the problem of low porosity calculation accuracy. A good application effect has been achieved in the porosity evaluation of volcanic reservoirs in Zhongguai Uplift.
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