川南下寒武统筇竹寺组层序地层及其对储层的控制

doi:10.11885/j.issn.1674-5086.2024.11.18.53

摘要/Abstract

摘要： 目前四川盆地筇竹寺组两种类型勘探目标(富有机质页岩、含有机质页岩)均已取得突破，展现出良好的勘探潜力。为了明确其层序发育模式及其对储层的控制作用，综合应用露头剖面、测录井资料、地震剖面等资料，在川南地区筇竹寺组页岩地层中识别出5个三级层序界面，划分了4个三级层序。SQ1对应筇一段底部沉积，仅分布于绵阳—长宁凹槽核部；SQ2、SQ3对应筇一段上部及筇二段沉积，分布于凹槽西侧及内部；SQ4对应筇三段沉积，广泛分布于整个凹槽。层序充填序列反映出凹槽逐步填平补齐的过程。海侵体系域(TST)发育高总有机碳含量、高脆性、较高孔隙度的黑色页岩，凹槽内沉积厚度明显大于两侧。海退体系域(RST)发育含有机质页岩，非均质性较强，仅凹槽西侧SQ3—RST具有高孔隙度、高脆性矿物含量、高含气量特征。该研究对于在层序格架内寻找有利勘探目标具有重要的指导意义。

关键词: 川南地区, 筇竹寺组, 页岩, 层序地层, 储层特征

Abstract: Currently, breakthroughs have been made in two exploration targets of the Qiongzhusi Formation in the Sichuan Basin (organic-rich shale and organic-lean shale), demonstrating good exploration potential. To clarify the sequence development pattern and its control on reservoir quality, this study utilized outcrop-drilling-seismic data, geochemistry, paleobiology, and other information to identify five third-order sequence boundaries and four third-order sequences within the Qiongzhusi Formation shale strata in the southern Sichuan Region. SQ1 corresponds to the bottom of the first member of the Qiongzhusi Formation, distributed only in the core of the intracratonic sag; SQ2 and SQ3 correspond to the upper part of the first member and the second member of the Qiongzhusi Formation, distributed on the western side and within the intracratonic sag; SQ4 corresponds to the third member of the Qiongzhusi Formation, widely distributed across the entire intracratonic sag. The sequence filling succession reflects the process of gradual filling and leveling the intracratonic sag. The transgressive systems tract (TST) is characterized by the development of black shale with high total organic carbon, high brittleness, and relatively high porosity. The deposition thickness is large within the intracratonic sag and gradually thins towards both sides. The regressive systems tract (RST) is dominated by organic-lean shale with strong heterogeneity. Only the RST of SQ3 on the western side of the intracratonic sag exhibits high porosity and brittleness, with good gas test results. This research holds significant guidance for predicting favorable exploration targets within the sequence framework.

Key words: Southern Sichuan Basin, Qiongzhusi Formation, shale, sequence stratigraphy, reservoir characteristics

中图分类号:

TE122

唐建明, 王同, 周桦, 罗思聪, 周静. 川南下寒武统筇竹寺组层序地层及其对储层的控制[J]. 西南石油大学学报(自然科学版), 2024, 46(6): 32-44.

TANG Jianming, WANG Tong, ZHOU Hua, LUO Sicong, ZHOU Jing. Sequence Stratigraphy of the Cambrian Qiongzhusi Formation and Its Control over Reservoirs in Southern Sichuan Basin[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2024, 46(6): 32-44.

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