1研究目的辽宁东部地区位于华北克拉通的东北缘(Zhao Guochun et al.,2012)。该地区中元古代晚期—新元古代早期地层发育,层序保存完整且出露较好,是研究华北克拉通中、新元古界的关键地区之一。桥头组分布于辽宁东部的本溪、辽阳、丹...1研究目的辽宁东部地区位于华北克拉通的东北缘(Zhao Guochun et al.,2012)。该地区中元古代晚期—新元古代早期地层发育,层序保存完整且出露较好,是研究华北克拉通中、新元古界的关键地区之一。桥头组分布于辽宁东部的本溪、辽阳、丹东、大连等地区,曾被认为形成于新元古代晚期南华纪(辽宁省地质勘查院,2017)。近些年随着同位素测年技术的广泛应用,桥头组形成于中元古代晚期—新元古代早期的观点被广泛认可(Zhang Wen et al.,2020,2021;Zhao Hanqing et al.,2020),但目前针对桥头组的研究大多集中在物源分析及其对华北克拉通古地理重建等方面(Zhang Shuahong et al.,2016;He Tianchen et al.,2016;Zhang Wen et al.,2020,2021;Zhao Hanqing et al.,2020),少量文献则根据岩石学、矿物学、地球化学等传统地质方法对桥头组的古气候进行研究(曲洪祥等,2011;田德欣等,2018;吴子杰等,2020),但并未形成统一的认识。展开更多
In order to explore the oil and gas resource prospects in the Carboniferous–Permian strata in northern Songliao Basin,geological survey boreholes(HFD 1 and HFD 2)were drilled in the area,and thick dark mudstone and s...In order to explore the oil and gas resource prospects in the Carboniferous–Permian strata in northern Songliao Basin,geological survey boreholes(HFD 1 and HFD 2)were drilled in the area,and thick dark mudstone and slate of the Upper Permian Linxi Formation were encountered.Source rock geochemistry analysis of the samples show that the organic matter abundance of the Upper Permian Linxi Formation source rock in the north of Songliao Basin is high,which belongs to medium to good source rock.The organic matter belongs to type Ⅱ,and it is in the evolution stage of highly mature to over mature.The Pr/Ph ratios of the source rocks range from 0.16 to 0.93,with an average of 0.53.The phytane predominance is obvious,and indicates a strong reduction to reduction sedimentary environment,which is conducive to the preservation of organic matter.Pr/nC_(17),Ph/nC_(18) and C_(27)–C_(28)–C_(29) regular steranes indicate that the organic matter was derived from a mixture of vascular plants and aquatic organisms such as algae,and is mainly contributed by phytoplankton.Through comprehensive analysis,it is considered that the source rocks of the Upper Permian Linxi Formation in northern Songliao Basin have entered the gas generation stage and have shale gas exploration prospects.展开更多
文摘1研究目的辽宁东部地区位于华北克拉通的东北缘(Zhao Guochun et al.,2012)。该地区中元古代晚期—新元古代早期地层发育,层序保存完整且出露较好,是研究华北克拉通中、新元古界的关键地区之一。桥头组分布于辽宁东部的本溪、辽阳、丹东、大连等地区,曾被认为形成于新元古代晚期南华纪(辽宁省地质勘查院,2017)。近些年随着同位素测年技术的广泛应用,桥头组形成于中元古代晚期—新元古代早期的观点被广泛认可(Zhang Wen et al.,2020,2021;Zhao Hanqing et al.,2020),但目前针对桥头组的研究大多集中在物源分析及其对华北克拉通古地理重建等方面(Zhang Shuahong et al.,2016;He Tianchen et al.,2016;Zhang Wen et al.,2020,2021;Zhao Hanqing et al.,2020),少量文献则根据岩石学、矿物学、地球化学等传统地质方法对桥头组的古气候进行研究(曲洪祥等,2011;田德欣等,2018;吴子杰等,2020),但并未形成统一的认识。
基金Supported by the National Key Research and Development Program of China(No.2019YFC0605404)China Geological Survey Project(Nos.DD20221664 and DD20190097)。
文摘In order to explore the oil and gas resource prospects in the Carboniferous–Permian strata in northern Songliao Basin,geological survey boreholes(HFD 1 and HFD 2)were drilled in the area,and thick dark mudstone and slate of the Upper Permian Linxi Formation were encountered.Source rock geochemistry analysis of the samples show that the organic matter abundance of the Upper Permian Linxi Formation source rock in the north of Songliao Basin is high,which belongs to medium to good source rock.The organic matter belongs to type Ⅱ,and it is in the evolution stage of highly mature to over mature.The Pr/Ph ratios of the source rocks range from 0.16 to 0.93,with an average of 0.53.The phytane predominance is obvious,and indicates a strong reduction to reduction sedimentary environment,which is conducive to the preservation of organic matter.Pr/nC_(17),Ph/nC_(18) and C_(27)–C_(28)–C_(29) regular steranes indicate that the organic matter was derived from a mixture of vascular plants and aquatic organisms such as algae,and is mainly contributed by phytoplankton.Through comprehensive analysis,it is considered that the source rocks of the Upper Permian Linxi Formation in northern Songliao Basin have entered the gas generation stage and have shale gas exploration prospects.
