Paleokarst features and reservoir distribution in the Huanglong Formation of eastern Sichuan

Karstic breccias serve as the most direct indicator of paleokarst features, with their development significantly influenced by fluid sources, fluid nature, and isotopic fractionation. The study reveals that dolomite in the C2hl2 formation provides the optimal lithology for reservoir development, particularly in the upper and lower dissolution intervals. Reservoir formation is primarily controlled by structure, paleoclimate, and lithology, with the best positions being karst highlands, remnant hills, and sloping fields on karst slopes. The research utilized a combination of surface geology, drilling data, and isotopic analysis (carbon, oxygen, strontium) to analyze vertical zoning, plane distribution, and the degree of karstification.

Bing, Z., Rongcai, Z., Xuben, W., Yuan, L., Wei, L., Huaguo, W., & Zhonggui, H. (2011). Paleokarst features and reservoir distribution in the Huanglong Formation of eastern Sichuan. Petroleum Exploration and Development, 38(3), 257–267. https://doi.org/10.1016/s1876-3804(11)60032-3