岩性油气藏 ›› 2025, Vol. 37 ›› Issue (5): 97–110.doi: 10.12108/yxyqc.20250509

• 地质勘探 • 上一篇    

四川盆地德阳—安岳裂陷槽寒武系筇竹寺组地层划分及勘探意义

王振1,2, 王兴志1,2, 朱逸青3,4, 杨雨然3,4, 杨一茗3,4, 康家豪1,2, 黄柏文1,2, 吕豪1,2   

  1. 1. 油气藏地质及开发工程国家重点实验室, 成都 610500;
    2. 西南石油大学 地球科学与技术学院, 成都 610500;
    3. 中国石油西南油气田公司 页岩气研究院, 成都 610051;
    4. 页岩气地质评价与高效开发四川省重点实验室, 成都 610051
  • 收稿日期:2025-05-12 修回日期:2025-06-10 发布日期:2025-09-06
  • 第一作者:王振（2001—），男，西南石油大学在读硕士研究生，研究方向为沉积学与储层地质学。地址:（610500）四川省成都市新都区新都大道8号。Email:1783906386@qq.com。
  • 通信作者: 王兴志（1964—），男，博士，教授，主要从事储层沉积学等方面的教学与研究工作。Email:wxzswpi@163.com。
  • 基金资助:
    中国石油天然气股份有限公司西南油气田分公司科技项目“四川盆地寒武系筇竹寺组页岩气富集规律及有利区优选”（编号：25XNYTSC013)、省级专项“聚源兴川”下属课题“复杂区页岩气勘探选区评价技术示范及应用”（编号：2024ZHCG0183）和“四川盆地麦地坪组—筇竹寺组地层对比及时空展布研究”（编号：XNS页岩院JS2023-84）联合资助。

Stratigraphy subdivision and exploration implications of Cambrian Qiongzhusi Formation in Deyang-Anyue aulacogen，Sichuan Basin

WANG Zhen1,2, WANG Xingzhi1,2, ZHU Yiqing3,4, YANG Yuran3,4, YANG Yiming3,4, KANG Jiahao1,2, HUANG Baiwen1,2, LYU Hao1,2   

  1. 1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu 610500, China;
    2. School of Geoscience and Technology, Southwest Petroleum University, Chengdu 610500, China;
    3. Shale Gas Research Institute, PetroChina Southwest Oil and Gas Field Company, Chengdu 610051, China;
    4. Sichuan Provincial Key Laboratory of Shale Gas Geological Evaluation and Efficient Development, Chengdu 610051, China
  • Received:2025-05-12 Revised:2025-06-10 Published:2025-09-06

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摘要： 四川盆地德阳—安岳裂陷槽及周缘寒武系筇竹寺组页岩气勘探已获重大突破，展现出较大勘探潜力。综合钻井岩心、测井以及地震剖面资料，开展了筇竹寺组精细划分和展布特征研究，深入解析了裂陷槽古地貌对沉积的控制作用。研究结果表明：①四川盆地德阳—安岳寒武系筇竹寺组可划分为8个小层，其中1，3，5，7小层以泥页岩为主，2，4，6，8小层以粉砂岩为主，各小层可依据沉积旋回特征、测井曲线特征、岩石颜色与岩性特征、含生物特征实现精确识别。②德阳—安岳裂陷槽内部地貌单元（槽内深水区、槽内斜坡区、槽外隆起区）对寒武系筇竹寺组的沉积具有决定性控制作用。筇一段（1—6小层）为裂陷槽控制下的充填式沉积，南北均存在厚度高值区，沉积范围随时间推移逐渐扩大；筇二段（7—8小层）则转变为广覆式沉积，厚度高值区相较筇一段明显东移。③裂陷槽控制了筇竹寺组优质烃源岩的发育与分布，内部4套富有机质页岩储层（1，3，5，7小层）与其上覆致密泥质粉砂岩盖层（2，4，6，8小层）构成了有效源-储-盖组合，具有“生储倒置”成藏模式，槽内、槽缘多套源-储-盖叠置体系主导了震旦系—寒武系大型岩性油气藏的形成。裂陷槽内优质页岩储层与槽缘台地带丘滩体岩性圈闭为下一步勘探的两大重点方向。

关键词: 页岩气, 等时地层, 古地貌, 生储倒置, 台地丘滩体, 德阳—安岳裂陷槽, 筇竹寺组, 寒武系, 四川盆地

Abstract: Significant breakthroughs of shale gas exploration of Cambrian Qiongzhusi Formation in Deyang-Anyue aulacogen and its periphery of Sichuan Basin have obtained，which exhibit substantial exploration potential. Based on data of drilling core，well logging，and seismic profile，a study was conducted on subdivision and distribution characteristics of Qiongzhusi Formation，and the controlling effects of aulacogen paleogeomorphology on sedimentation was deeply analyzed.The results show that：（1）Cambrian Qiongzhusi Formation in DeyangAnyue Sichuan Basin can be divided into eight sub-layers，sub-layers 1，3，5 and 7 are dominated by mudstones， while sub-layers 2，4，6 and 8 are mainly siltstones. Each sub-layer can be accurately identified through sedimentary cycli-city，logging curve characteristics，lithology（color and composition），and biogenic features.（2）The geomorphic units（intratrough deep-water zone，intratrough slope zone，and uplift zone extratrough）within DeyangAnyue sub-layers exert decisive control on the development of Cambrian Qiongzhusi Formation. Qiong-1 Member （sub-layers 1-6）is a filling deposition controlled by a rift trough，with high-value thickness areas in both the north and south，and the sedimentation range gradually expands over time. In contrast，Qiong-2 Member（sublayers 7-8）has transformed into a widespread sedimentation，with high-value thickness areas distinctly shifted eastward.（3）The aulacogen governs the development and distribution of high-quality source rocks from Qiongzhusi Formation. Four organic-rich shale reservoirs（sub-layers 1，3，5，7）and their overlying tight argillaceous siltstone caps（sub-layers 2，4，6，8）form an effective source-reservoir-cap assemblage，with“source-reservoir inversion”accumulation model. Multiple sets of stacked source-reservoir-cap assemblages inside the aulacogen and along its margins dominated the formation of large-scale lithological oil and gas reservoirs in Sinian-Cambrian. High-quality shale reservoirs within the aulacogen and mound-shoal body lithological traps along the trough margin platform zone are the two key targets for next-phase exploration.

Key words: shale gas, isochronous stratigraphy, paleogeomorphology, source-reservoir inversion, platform moundshoal body, Deyang-Anyue aulacogen, Qiongzhusi Formation, Cambrian, Sichuan Basin

中图分类号: 

  • TE121.3
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