地质力学学报2025，Vol.31Issue(2)：248-266,19.DOI:10.12090/j.issn.1006-6616.2024059
滇黔桂地区垭紫罗裂陷海槽泥盆系—石炭系页岩气富集成藏主控因素
Factors controlling enrichment and accumulation of Devonian-Carboniferous shale gas in the Yaziluo rift trough in the Yunnan-Guizhou-Guangxi region
摘要
Abstract
[Objective]Compared with the Wufeng-Longmaxi Formation in the Sichuan Basin and its periphery,the Yunnan-Guizhou-Guangxi region has more complex conditions for the enrichment and accumulation of shale gas.Currently,the exploration degree of shale gas in the Yunnan-Guizhou-Guangxi region is relatively low,and the main factors controlling the enrichment and accumulation of shale gas are unclear.[Methods]This paper relies on a large number of studies from the basic surveys of shale gas and major special projects in the Yunnan-Guizhou-Guangxi region.The research includes the sedimentary characteristics,diagenesis,hydrocarbon generation,thermal evolution characteristics,shale reservoir characteristics,accumulation patterns,and preservation conditions of the Devonian-Carboniferous shale in the Yunnan-Guizhou-Guangxi region.[Results]The research indicated that the deposition of Devonian-Carboniferous organic-rich shale was mainly controlled by rift troughs,and the sweet spots of organic-rich shale were mainly formed in the transgressive system tract and the early highstand system tract of deep-water facies sedimentation.The regional sea level rise has brought abundant nutrients,promoting the wealth of organisms in the water body and generating strong biological productivity,which provides a good material basis for the formation of organic-rich sediments.Seismic interpretation reveals that most of the areas distributed along the main rift trough are greatly affected by destruction by late-stage tectonic activities,leading to the deterioration of the preservation conditions of shale gas.In contrast,the secondary rift troughs around the main rift trough have relatively stable structures,providing good conditions for the preservation of shale gas.[Conclusion]On this basis,the main controlling model for the enrichment and accumulation of shale gas in the Devonian-Carboniferous system in the Yunnan-Guizhou-Guangxi region is proposed:"rift trough deposition,deep-water lithofacies controlled hydrocarbon generation,and structural preservation in secondary rift troughs".The model has been confirmed through the drilling of multiple wells.[Significance]The results of this research can be used as a guide for the optimal selection of favorable shale gas areas and for the drilling of parameter wells in the future.关键词
滇黔桂地区/泥盆系—石炭系/裂陷海槽/次级裂陷槽/富集成藏主控因素/页岩气Key words
Yunnan-Guizhou-Guangxi region/Devonian-Carboniferous shale gas/rift trough/secondary rift trough/enrichment and accumulation rules/shale gas分类
石油、天然气工程引用本文复制引用
王玉芳,翟刚毅,石万忠,王劲铸,张家政,康海霞,张云枭,周惠,张舒婷..滇黔桂地区垭紫罗裂陷海槽泥盆系—石炭系页岩气富集成藏主控因素[J].地质力学学报,2025,31(2):248-266,19.基金项目
中国地质调查局地质调查项目(DD202402007,DD20190108) （DD202402007,DD20190108）
国家科技重大专项项目(2016ZX05034)This research is financially supported by the Geological Survey Project of China Geological Survey(Grant Nos.DD202402007 and DD20190108)and the National Science and Technology Major Special Project(Grant No.2016ZX05034). （2016ZX05034）
