四川盆地德阳—安岳裂陷槽筇竹寺组古地貌、沉积模式与勘探方向

doi:10.3969/j.issn.1672-7703.2024.06.006

摘要/Abstract

摘要： 德阳—安岳裂陷槽内筇竹寺组页岩气勘探潜力巨大，筇竹寺组沉积关键时期裂陷槽形态及对页岩气的影响尚无系统认识。通过层序地层搭建筇竹寺组沉积格架，结合页岩储层厚度、页岩储层品质等分析沉积地貌对页岩气地质意义, 结果表明：（1）基于地震追踪关键层序界面，结合沉积相、页岩厚度等将已取得勘探突破的筇一段二亚段古地貌划分为槽内、斜坡、槽外3 个单元；（2）古地貌与物源控制了筇一段二亚段页岩地质特征，包括页岩厚度与页岩储集特征；（3）古地貌、微相与储层厚度具有良好耦合关系，槽内单元发育富长石的硅质泥岩陆棚微相，页岩储层厚度大于20m；斜坡单元发育（含）粉砂质泥岩陆棚微相，页岩储层厚度为5～20m；槽外单元发育泥质粉砂岩陆棚微相，页岩储层厚度小于5m。综合认为，筇一段二亚段古地貌对页岩有明显控制作用，槽内和斜坡单元页岩厚度大、埋深5000m 以浅的区域，是筇竹寺组页岩气勘探开发的主要目标，已有井实施效果好，勘探开发潜力巨大；槽外单元以近源粉砂质页岩为主要勘探目标。

关键词: 四川盆地, 德阳- 安岳裂陷槽, 筇竹寺组, 页岩气, 古地貌, 沉积模式

Abstract: The shale gas within the Deyang-An’gue sag, specifically in the Qiongzhushi Formation, exhibits significant exploration potential. The characterization of the sag’s depositional features during the sedimentary period of the Qiongzhushi Formation has not been systematically understood. By establishing a sequence stratigraphy framework for the deposition of the Qiongzhushi Formation and analyzing sedimentary landforms based on shale thickness and quality, the geological significance of shale gas is elucidated. The results indicate that, considering sedimentary landforms, sedimentary facies, shale thickness, etc., the sedimentary period of the Qiong 1-2 sub-section can be divided into three landform units: intra-sag, slope, and extra-sag. Ancient landforms and source materials jointly control the shale thickness and quality. The intra-sag unit develops a siliceous mud-shale microfacies, with a shale reservoir thickness exceeding 20 m. The slope unit develops (including) sandy mud-shale microfacies, with a shale reservoir thickness of 5 to 20 m. The extra-sag unit develops muddy sandy-shale microfacies, with a shale reservoir thickness less than 5 m.

Key words: Sichuan Basin, Deyang-Anyue rift trough, Qiongzhusi Formation, Deep shale gas, Sedimentary microfacies

中图分类号:

TE122.1

杨雨然, 石学文, 李彦佑, 何一凡, 朱逸青, 张入化, 徐亮, 杨雪, 杨一茗, 张亦弛. 四川盆地德阳—安岳裂陷槽筇竹寺组古地貌、沉积模式与勘探方向[J]. 中国石油勘探, 2024, 29(6): 68-81.

Yang Yuran, Shi Xuewen, Li Yanyou, He Yifan, Zhu Yiqing, Zhang Ruhua, Xu Liang, Yang Xue, Yang Yiming, Zhang Yichi. Paleogeomorphology, sedimentary patterns and exploration of Deyang Anyue Rift Trough in Qiongzhusi Formation, Sichuan Basin[J]. China Petroleum Exploration, 2024, 29(6): 68-81.

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