塔里木盆地柯坪地区寒武系玉尔吐斯组沉积环境分析
发布时间：2018-11-21 18:25
【摘要】：塔里木盆地柯坪地区出露的寒武系底部玉尔吐斯组为层状硅质岩—黑色泥页岩—白云岩沉积组合。在露头实测的基础上,通过层序地层、岩石学、成烃生物组合及地球化学研究,剖析其沉积环境,为盆地内部早寒武世早期岩相古地理和烃源岩预测提供依据。玉尔吐斯组下部层状硅质岩与中部黑色泥页岩构成三级层序SQ1,受控于早寒武世早期海侵和上升流作用,准层序为退积式叠置;上部中薄层白云岩与肖尔布拉克组下部白云岩构成另一三级层序SQ2,是海退背景下进积型沉积组合。2个三级层序的沉积环境经历了浅水陆棚—深水陆棚—浅水陆棚的演变,其中SQ1黑色泥页岩段为深水陆棚缺氧环境沉积,是烃源岩发育的有利相带。
[Abstract]:The Yultux formation at the bottom of Cambrian in Keping area, Tarim Basin, is composed of layered siliceous rocks, black shale and dolomite sedimentary assemblages. On the basis of outcrop measurements, the sedimentary environment is analyzed through sequence stratigraphy, petrology, hydrocarbon forming bioassemblage and geochemistry, which provides basis for early Cambrian lithofacies paleogeography and source rock prediction in the basin. The stratiform siliceous rocks in the lower part of the Yultuoshi formation and the black shale in the middle of the formation constitute the third-order sequence SQ1, controlled by the early Cambrian transgression and upwelling, and the quasi-sequence is a retrogradation superposition. The upper middle thin layer dolomite and the lower part dolomite of the Scholburak formation constitute another three-order sequence SQ2, which is a progradational sedimentary assemblage in the regressive setting. The sedimentary environment of the two third-order sequences has undergone the evolution of shallow water shelf, deep water shelf and shallow water shelf. The SQ1 black shale is an anoxic deposit in deep shelf, which is a favorable facies zone for the development of hydrocarbon source rocks.
【作者单位】： 中国石化油气成藏重点实验室;中国石化石油勘探开发研究院无锡石油地质研究所;西南石油大学;
【基金】：国家重点基础研究发展计划(973计划)项目(2012CB214801) 中国石化科技部项目(P12004)联合资助
【分类号】：P618.13
本文编号：2347888
[Abstract]:The Yultux formation at the bottom of Cambrian in Keping area, Tarim Basin, is composed of layered siliceous rocks, black shale and dolomite sedimentary assemblages. On the basis of outcrop measurements, the sedimentary environment is analyzed through sequence stratigraphy, petrology, hydrocarbon forming bioassemblage and geochemistry, which provides basis for early Cambrian lithofacies paleogeography and source rock prediction in the basin. The stratiform siliceous rocks in the lower part of the Yultuoshi formation and the black shale in the middle of the formation constitute the third-order sequence SQ1, controlled by the early Cambrian transgression and upwelling, and the quasi-sequence is a retrogradation superposition. The upper middle thin layer dolomite and the lower part dolomite of the Scholburak formation constitute another three-order sequence SQ2, which is a progradational sedimentary assemblage in the regressive setting. The sedimentary environment of the two third-order sequences has undergone the evolution of shallow water shelf, deep water shelf and shallow water shelf. The SQ1 black shale is an anoxic deposit in deep shelf, which is a favorable facies zone for the development of hydrocarbon source rocks.
【作者单位】： 中国石化油气成藏重点实验室;中国石化石油勘探开发研究院无锡石油地质研究所;西南石油大学;
【基金】：国家重点基础研究发展计划(973计划)项目(2012CB214801) 中国石化科技部项目(P12004)联合资助
【分类号】：P618.13
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