康滇隆起西缘地区氦气成藏条件及其主控因素OA
Conditions and controlling factors of helium accumulation in the western margin of Kangdian Uplift
氦气作为一种紧缺性战略资源而备受重视,目前中国氦气对外依存度高,供应安全面临严峻挑战.在康滇隆起西缘前期的勘探对象主要是常规油气,部分钻井见到了较好的氦气显示,表明该区具有一定的氦气勘探潜力.为了给国内氦气选区评价工作提供参考和依据,通过分析康滇隆起西缘钻井的气体组分、流体资料、区域地质资料,从有效氦源岩、运移通道、运移载体、保存条件等方面对该区氦气成藏条件进行了系统分析,探究了氦气成藏的主控因素,并建立了2类氦气成藏模式.研究结果表明:①康滇隆起西缘温泉气和天然气中均显示富氦流体,部分钻井揭示出较高的氦气显示且具备工业开采价值;②该区泥盆系和志留系泥页岩铀、钍含量高,为优质氦源岩;③该区经历了4个构造演化阶段,发育的基底深大断裂可作为氦气运移的通道.结论认为:①康滇隆起西缘富氦流体氦气成因以壳源氦为主,楚雄盆地等局部地区的氦气为壳幔混源成因;②该区发育多套高含铀、钍沉积岩,发育基底深大断裂,局部保存条件良好,具备有利的富氦气藏形成条件;③优质氦源岩与深大断裂运移通道是该区富氦流体形成的主控因素.
Helium is highly valued as a scarce strategic resource.China is highly dependent on imported helium,implying a severe challenge of supply security.The early exploration in the western margin of Kangdian Uplift,which primarily focused on conventional oil and gas,revealed favorable helium shows in some wells,suggesting that this area holds a certain potential of helium resource.To provide reference and basis for helium area evaluation in China,the conditions for helium accumulation in the western margin of Kangdian Uplift were analyzed from the aspects of effective helium source rocks,migration pathways,migration carriers and preservation conditions after investigating the gas composition,fluid information and regional geological data of wells in this area.Then,the main controlling factors of helium accumulation were explored,and two types of helium accumulation models were established.Results show that helium-rich fluids appear in both hot spring gas and natural gas in the western margin of Kangdian Uplift,and some wells show relatively high helium-rich fluids and industrial exploitation value.The Devonian and Silurian shales in the study area have high contents of uranium and thorium and serve as high-quality helium source rocks.Also,the study area has undergone four stages of tectonic evolution,and the deep basement faults act as pathways for helium migration.It is concluded that(i)the source of helium gas in the western margin of the Kangdian Uplift is mainly crustal helium,while helium gas in local areas such as the Chuxiong Basin is of mixed crust mantle source;(ii)this area is developed with multiple sets of uranium-and thorium-rich sedimentary rocks,featuring deep basement faults,and exhibits favorable preservation conditions locally,creating favorable conditions for the formation of helium-rich gas reservoirs;and(iii)high-quality helium source rocks and deep faults as migration pathways are the main factors controlling the formation of helium-rich fluids in the western margin of Kangdian Uplift.
李旭文;韩京;甘元露
中国石化深部地质与资源重点实验室||中国石化勘探分公司中国石化深部地质与资源重点实验室||中国石化勘探分公司中国石化深部地质与资源重点实验室||中国石化勘探分公司
能源科技
康滇隆起西缘氦气成藏条件主控因素铀、钍含量深大断裂壳源壳幔混源
Western margin of Kangdian UpliftHeliumAccumulation conditionMain controlling factorUranium and thorium contentsDiscordogenic faultCrustal sourceCrust-mantle mixed source
《天然气勘探与开发》 2026 (3)
56-67,12
中国石油化工股份有限公司项目"四川盆地及周缘资源评价"(编号:P23221).
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