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四川盆地长宁地区震旦系—寒武系裂陷槽的发现及其地质意义
Discovery and geological significance of the Sinian-Cambrian rift trough in the Changning area, Sichuan Basin
邱玉超 罗 冰 夏茂龙 陈友莲 戴 鑫 李亚丁 周红飞 和 源
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作者单位:中国石油西南油气田公司勘探开发研究院
中文关键字:四川盆地 长宁地区 裂陷槽 台缘带 灯影组 成藏配置条件 有利区带
英文关键字:Sichuan Basin, Changning area, Rift trough, Platform margin, Dengying Formation, Reservoir formation, Favorable zone
中文摘要:四川盆地安岳气田位于德阳- 安岳裂陷槽东台缘,已探明近1×1012 m3 天然气储量。前期天然气勘探开发揭示,震旦系-寒武系的德阳—安岳裂陷槽是油气富集的有利区,但对其往南延伸情况及分布一直认识不清。本次充分利用三维地震资料结合钻井资料,发现长宁地区发育震旦系—寒武系裂陷槽,并精细刻画了该区裂陷槽的边界与空间展布,分析了该裂陷槽的地质意义。研究揭示:①在长宁地区台缘带位置筇竹寺组地层超覆、灯影组地层地震削截特征明显;②地震解释震旦系灯影组地层厚度从台缘带至槽内显著减薄,从台内至台缘带有增厚趋势; ③该裂陷槽为德阳—安岳裂陷槽南延的东侧部分。总之,四川盆地南部长宁地区裂陷槽周缘筇竹寺组烃源岩优越、台缘带灯影组丘滩相储层发育,灯影组天然气成藏配置条件好,区内台缘带为下步重要的勘探有利区带,值得进一步积极探索。
英文摘要:The Anyue gas field in the Sichuan Basin is located at the eastern margin of the Deyang-Anyue rift trough, and has nearly one trillion cubic meters of natural gas proven reserves. The exploration and development of natural gas in the early stage revealed that the Sinian-Cambrian Deyang-Anyue rift trough in Sichuan Basin is a favorable area for hydrocarbon enrichment, but its southward extension and distribution have been unclear. Taking full advantage of the 3D seismic data combined with the drilling data, it is found that the Sinian-Cambrian rift trough is developed in Changning area, and the boundary and distribution of the rift trough in this area are described in detail, and the geology significance of the rift trough is analyzed. The research reveals that: (1) the onlaping of Qiongzhusi Formation in the marginal zone of the platform is obvious, as well as the truncation of Dengying Formation; (2) the Sinian Dengying Formation is significantly thinned from the platform edge to the trough, and from the inner platform to the platform margin there is a tendency to increase; (3) The rift trough is the eastern part of the south extension of Deyang-Anyue rift trough. In short, the source rocks of Qiongzhusi Formation in the periphery of the rift trough at Changning area in the southern Sichuan Basin are superior,
and the reservoirs of Dengying Formation in the Taiyuan area are well developed. The reservoir formation conditions of Dengying Formation are well combined, and the platform margin in this area is favorable zones for the next exploration, and is worth further exploration.
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国内统一连续出版物号:CN51-1159/TE |国内发行代码: |国际标准出版物号:ISSN1673-3177 |国际发行代码:
主管单位:中国石油西南油气田公司  主办单位:中国石油西南油气田公司勘探开发研究院
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