火山岩储层孔隙结构特征评价方法及应用——以准噶尔盆地红车断裂带北段石炭系为例

doi:10.12108/yxyqc.20260513

Lithologic Reservoirs ›› 2026, Vol. 38 ›› Issue (5): 136-148.doi: 10.12108/yxyqc.20260513

• PETROLEUM EXPLORATION • Previous Articles Next Articles

Evaluation methods and applications of pore structure characteristics in volcanic rock reservoirs：A case study of Carboniferous in the northern section of Hongche fault zone， Junggar Basin

SONG Yulin¹(), FU Jian¹(), XU Yifan¹, HAN Junwei², HUANG Cheng², ZHOU Huafeng², YANG Xiaofan²

¹ School of Earth Sciences, Northeast Petroleum University, Daqing 163318, Heilongjiang, China
² No. 1 Oil Production Plant, PetroChina Xinjiang Oilfield Company, Karamay 834000, Xinjiang, China

Received:2026-03-25 Revised:2026-04-22 Online:2026-09-01 Published:2026-09-04
Contact: FU Jian E-mail:1061161348@qq.com;fujian287@gmail.com

Abstract

Abstract:

Taking Carboniferous volcanic reservoir in the northern section of Hongche fault zone in Junggar Basin as an example， the volcanic lithology， physical properties and reservoir space types were analyzed. The pore structure was classified based on the capillary pressure curve characteristics， and the pore size distribution index （λ） was introduced to achieve quantitative characterization of the pore structure. The control effect of λ on the relative permeability of oil-water two-phase and hydrocarbon charging efficiency was clarified. By screening the optimal logging sensitive parameters through correlation， combining linear fitting and Powell algorithm optimization modeling， a quantitative logging prediction method for λ was constructed and applied to reservoir evaluation in the study area.The results show that：（1） Carboniferous volcanic rocks in the northern section of Hongche fault zone are mainly composed of basalt， andesite， tuff， volcanic breccia and volcaniclastic sedimentary rocks. The overall reservoir is medium-low porosity and low-permeability， with poor porosity-permeability correlation， and the reservoir space is a composite pore-fracture system consisting of secondary pores and fractures. The storage space is a pore fracture composite system composed of secondary pores and fractures.（2） The pore structures of volcanic reservoirs in the study area can be classified as three types：Type Ⅰ capillary pressure curve shows a gentle-slope， and is dominated by volcanic breccia， with the best pore structure and seepage performance. Type Ⅲ capillary pressure curve exhibits a steep-slope， and is mainly composed of basalt and andesite， with the poorest reservoir physical properties. And Type Ⅱ is intermediate between Type Ⅰ and Type Ⅲ， is dominated by tuff and volcaniclastic sedimentary rocks.The λ values of three types of reservoirs decrease sequentially， and the homogeneity degree of pores declines gradually. （3） The λ values can quantitatively characterize the homogeneity degree of pore size and fluid mobility. A larger λ value indicates higher pore homogeneity， better pore structure， superior reservoir seepage performance and higher hydrocarbon charging efficiency. （4） The multi-parameter prediction formula for λ has reliable accuracy， with an average relative error of merely 0.13. The reservoir evaluation results obtained from predicted λ values of actual wells are highly consistent with the conclusions of gas logging and oil testing.

Key words: pore structure, volcanic reservoir, pore size distribution index, two-phase seepage characteristics, reservoir evaluation, multi-parameter fitting, Carboniferous, Hongche fault zone, Junggar Basin

CLC Number:

TE3112

SONG Yulin, FU Jian, XU Yifan, HAN Junwei, HUANG Cheng, ZHOU Huafeng, YANG Xiaofan. Evaluation methods and applications of pore structure characteristics in volcanic rock reservoirs：A case study of Carboniferous in the northern section of Hongche fault zone， Junggar Basin[J].Lithologic Reservoirs, 2026, 38(5): 136-148.

Figures/Tables 16

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参数	与λ的Pearson相关系数	显著性P 值
λ	1.000	—
SP/mV	0.401^**	0.001
GR/API	0.550^**	0.000
AC/（μs·m^-1）	-0.356^**	0.005
CNL/%	-0.529^**	0

储层类型	孔隙度/%	渗透率/mD	λ
Ⅰ	≥ 12	≥ 5	0.43~1.32
Ⅱ	5~< 12	1~< 5	0.31~1.01
Ⅲ	< 5	< 1	0.32~0.84

Evaluation methods and applications of pore structure characteristics in volcanic rock reservoirs：A case study of Carboniferous in the northern section of Hongche fault zone， Junggar Basin

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