
Petrophysical characteristics of deep intermediate-basic volcanic gas reservoir
ChengCheng LI, KeFei ZHANG, XiaoYi MA, Huan WANG, Jun BAI
Prog Geophy ›› 2025, Vol. 40 ›› Issue (2) : 580-591.
Petrophysical characteristics of deep intermediate-basic volcanic gas reservoir
In recent years, the exploration of deep volcanic rocks in Songliao Basin has achieved a breakthrough in the new formation series (Huoshiling Formation) and new rock type (intermediate-basic volcanic rocks). The physical response of deep volcanic rocks is complex and multi-solution because of the variety of mineral composition, no obvious boundary and relatively compact rocks. In order to quantitative analysis the physical responses and differences of deep intermediate-basic volcanic rocks and improve the accuracy of volcanic rock lithology identification and reservoir prediction, 40 typical samples of volcanic rocks from Huoshiling Formation in the southern Songliao Basin are selected, the rock mineral composition and microstructure are quantitatively analyzed, the eight types of rocks are classified into three types by introducing lithofacies and rock structure information, that is effusive andesite, explosive tuff and volcanic breccia, the petrological characteristics and petrophysical parameters under formation pressure and fluid conditions are tested, and the relationships between petrophysical parameters and lithofacies, lithology, physical properties and fluid are clarified. The results show that the petrophysical properties of deep volcanic rocks are controlled by the combination of lithofacies and lithology, the rock physical properties of explosive tuff are the best, density and p-wave impedance can be used as the sensitive parameters for the optimization of high quality reservoirs, the identification threshold and quantitative relationship are different with the types of volcanic rocks, that is density is small than 2.582 g/cm3 for the effusive andesite, 2.509 g/cm3 for the explosive tuff and 2.555 g/cm3 for the volcanic breccia. There are obvious differences in fluid identification ability of rock physical parameters under different rock types, the combination parameters λ-0.28 μ、Ip2-2.15 Is2、λ/μ can be used to identify the fluid properties in the effusive andesite, the explosive tuff and volcanic breccia rocks respectively based on the tested petrophysical parameters and sensitivity analysis results of the fluid saturated rock samples, and the identification effect is good when the sensitive parameters are used in the actual study area.
Huoshiling Formation / Intermediate-basic volcanic rocks / Rock type / Physical parameters / Elastic parameters / Fluid identification
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