| Citation: | FAN Cunhui, HAO Ting, LIU Yong, LIU Wenping, ZHAO Shengxian, ZHANG Chenlin, LI Bo, XIE Shengyang, QIAO Lin, LIU Shengjun, TANG Linji. Development characteristics and favorable area evaluation of organic-rich shale fractures in first member of Longmaxi Formation, Luzhou area, southern Sichuan Basin[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2025, 47(6): 1282-1294. doi: 10.11781/sysydz2025061282
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The shale gas in the first member of the Silurian Longmaxi Formation in the southern Sichuan Basin exhibits promising potential for exploration and development. To clarify the influence of the development characteristics of natural fractures in shales on shale gas enrichment patterns, the organic-rich shales in the first member of the Longmaxi Formation in the Luzhou area, southern Sichuan Basin were selected as the study objects. Utilizing drilling cores, thin-section identification, and geophysical well logging data, this study investigated the types and development characteristics of fractures in the Longmaxi Formation shales in the study area through comprehensive geological analysis methods. The results showed that the fracture types were mainly structural fractures (shear fractures) and non-structural fractures. Structurally, the degree of fracture development was negatively correlated with the distance from faults, with fractures being well-developed in the anticline areas and less developed in the syncline areas. In terms of non-structural factors, fracture density was positively correlated with total organic carbon content (≥2%) and brittle mineral content (≥44%). The gas-bearing capacity of organic-rich shales in the study area was affected by factors such as the degree of fracture filling, the relationship between the current in-situ stress direction and the fracture strike, and the degree of fracture dispersion. Among these, partially filled and unfilled fractures, fractures intersecting with the current maximum principal stress at high oblique angles, and fracture networks with scattered strikes significantly enhanced the gas-bearing capacity of shales. This study divided the effective fractures in the organic-rich shales of the first member of the Longmaxi Formation in the Luzhou area of the southern Sichuan Basin into 6 Class Ⅰ favorable areas and 7 Class Ⅱ favorable areas. It identified the anticline areas and areas adjacent to fault zones as the exploration target areas. These findings provide important theoretical support and practical guidance for the exploration and development of shale gas in the Luzhou area of the southern Sichuan Basin.
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