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Subaqueous volcanic eruptive facies,facies model and its reservoir significance in a continental lacustrine basin:A case from the cretaceous in Chaganhua area of southern Songliao Basin,NE China

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Petroleum Exploration and Development 2023年第4期50卷 826-839页

作者： SHAN Xuanlong MU Hansheng LIU Yuhu LI Ruilei ZHU Jianfeng SHI Yunqian LENG Qinglei YI Jian College of Earth Sciences Jilin UniversityChangchun 130061China SINOPEC Northeast Oil and Gas Company Changchun 130062China

The conventional lithofacies and facies model of subaerial and marine pyroclastic rocks cannot reflect the characteristics of subaqueous volcanic edifice in lacustrine *** order to solve this problem,the lithofacies of subaqueous eruptive pyroclastic rocks is discussed and the facies model is established by taking the tuff cone of cretaceous huoshiling formation in the Chaganhua area of the Changling fault depression,Songliao Basin as the research *** results indicate that the subaqueous eruptive pyroclastic rocks in the Songliao Basin can be divided into two facies and four *** two facies are the subaqueous explosive facies and the volcanic sedimentary facies that is formed during the eruption *** subaqueous explosive facies can be further divided into three subfacies:gas-supported hot pyroclastic flow subfacies,water-laid density current subfacies and subaqueous fallout *** volcanic sedimentary facies consists of pyroclastic sedimentary rocks containing terrigenous clast subfacies.A typical facies model of the tuff cone that is formed by subaqueous eruptions in the Songliao Basin was *** tuff cone is generally composed of multiple subaqueous eruption depositional units and can be divided into two facies associations:near-source facies association and far-source facies *** complete vertical succession of one depositional unit of the near-source facies association is composed of pyroclastic sedimentary rocks containing terrigenous clast subfacies,gas-supported hot pyroclastic flow subfacies,water-laid density current subfacies and subaqueous fallout subfacies from bottom to *** depositional unit of the far-source facies association is dominated by the subaqueous fallout subfacies and contains several thin interlayered deposits of the water-laid density current *** gas-supported hot pyroclastic flow subfacies and the pyroclastic sedimentary rocks containing terrigenous clast subfacies are

关键词： continental lacustrine basin Songliao Basin Chaganhua area cretaceous huoshiling formation subaqueous eruption volcanic facies tuff cone

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