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- Title
四川盆地南部双龙—罗场地区龙马溪组构造 裂缝特征及形成期次.
- Authors
陈丽清; 伍秋姿; 范存辉; 钟可塑; 杨 雪; 何 亮
- Abstract
Longmaxi Formation in Shuanglong-Luochang areas, southern Sichuan Basin is a key area for deep shale gas exploration and development. The development characteristics and formation stages of tectonic fractures have an important influence on shale gas bearing and productivity. By using core, FMI imaging logging, fracture filling fluid inclusion testing, rock acoustic emission experiments and burial thermal evolution history analysis, the development characteristics and formation period of shale structural fractures are comprehensively studied. The study results have shown that the tectonic fractures of Longmaxi Formation are mainly high angle fractures, vertical fractures and composite fractures of tectonic origin. The core fractures have the characteristics of large spacing, small density, large dip angle and high filling degree. The fracture dip angle of imaging logging is consistent with the core, and the extension orientation is mainly near EW, NNE and NWW directions, followed by NNW direction. The core fracture cutting relationship, fracture occurrence matching relationships of imaging logging, fracture filling fluid inclusion testing and rock acoustic emission experiment all confirm that the Longmaxi Formation structural fractures in Shuanglong-Luochang areas underwent more than three periods of tectonic movement transformation. Combined with the analysis of burial-thermal evolution history, it is deter⁃ mined that the formation periods of tectonic fractures are mid-late Yanshan Movement and early Himalayan Movement (78-56 Ma), middle Himalayan Movement (56-29 Ma)and late Himalayan Movement- present (29-0 Ma). The homogenization temperatures of the corresponding fluid inclusions are 165-198 ℃, 115-146 ℃ and 74-105 ℃, respectively. Based on the principle of structural geology, genetic mechanism of tectonic frac⁃ tures in the Longmaxi Formation in Shuanglong-Luochang areas is established.
- Publication
Natural Gas Geoscience, 2022, Vol 33, Issue 5, p789
- ISSN
1672-1926
- Publication type
Article
- DOI
10.11764/j.issn.1672-1926.2022.01.011