四川盆地仪陇—平昌地区上三叠统须家河组五段致密气成藏条件及勘探前景

doi:10.3969/j.issn.1672-7703.2025.01.004

摘要/Abstract

摘要： 四川盆地仪陇—平昌地区LG163井上三叠统须家河组五段超压致密砂岩气获得勘探突破，标志着须五段有望成为陆相致密油气效益规模增储的重要领域。基于LG163井须家河组致密砂岩气发现及前须家河组油气勘探成果，结合分析化验资料，围绕须五段生烃中心，对仪陇—平昌地区须家河组储层特征及其成藏演化展开系统研究。研究认为，仪陇—平昌地区须五段发育厚层暗色页岩，页岩平均TOC 普遍大于1%，有机质类型为Ⅱ₂—Ⅲ型，处于高—过成熟阶段，整体属于好烃源岩；东南部发育曲流河三角洲前缘砂岩储层，砂岩横向分布稳定，孔隙度为 1.5%～7.7%，平均为 4.8%，微裂缝发育，储层物性较好。须五₂亚段致密砂岩储层包裹在须五段烃源岩内部，垂向上形成“源包砂”优质成藏组合。须五段普遍发育地层超压，由斜坡向湖盆中心地层压力系数逐渐加大，致密砂岩气超压充注保存。综合烃源岩条件和储层物性特征，认为研究区须五段优质烃源岩分布面积为5600km²，富砂带面积为3553km²，预测勘探有利区致密气资源量达到5600×10⁸m³，具有良好的勘探前景，可成为规模天然气勘探发现的重要接替领域。

关键词: 四川盆地, 仪陇—平昌地区, 须五段, 致密砂岩气, 成藏条件

Abstract: An exploration breakthrough has been made in the overpressure tight sandstone gas reservoir in the fifth member of the Upper Triassic Xujiahe Formation (Xu 5 member) in Well LG 163, drilled in Yilong–Pingchang area, Sichuan Basin, marking an important field for increasing reserves of continental facies tight oil and gas with a large scale and benefits. Based on the discovery of tight sandstone gas in Well LG 163 and the previous exploration results in Xujiahe Formation, and combined with the experimental and lab test data, a systematic study of reservoir characteristics and gas accumulation and evolution in Xujiahe Formation in Yilong–Pingchang area has been conducted focusing on the hydrocarbon generation center in Xu 5 member. The study results suggest that thick dark shale was developed in Xu 5 member in Yilong–Pingchang area, with an average TOC of greater than 1%, Type Ⅱ₂-Ⅲ organic matter, and high–over maturity, showing a good source rock as a whole. The meandering river delta front facies sandstone reservoir was developed in the southeastern part, with consistent distribution in lateral, porosity range of 1.5%–7.7% and an average of 4.83%, well-developed microfractures, and good reservoir physical properties. The tight sandstone reservoir in the second sub-member (Xu 5₂ sub-member) was wrapped in source rock in Xu 5 member, forming a high-quality hydrocarbon accumulation combination of “sand wrapped by source rock” in vertical. The formation overpressure is generally observed in Xu 5 member, and the pressure coefficient gradually increases from the slope to the center of the lake basin, resulting in tight gas charging and preservation under overpressure conditions. The comprehensive study of source rock conditions and reservoir physical properties indicates that the high-quality source rock in Xu 5 member has an area of 5600 km², the sand enriched zone has an area of 3553 km², and the predicted tight gas resources are 5600×10⁸ m³, showing good exploration prospects, which is expected to be a major replacement field for obtaining largescale gas discoveries.

Key words: Sichuan Basin, Yilong-Pingchang area, Xu 5 member, tight sandstone gas, accumulation condition

中图分类号:

TE122.1

白雪峰, 杨雨, 李军辉, 王有智. 四川盆地仪陇—平昌地区上三叠统须家河组五段致密气成藏条件及勘探前景[J]. 中国石油勘探, 2025, 30(1): 42-55.

Bai Xuefeng, Yang Yu, Li Junhui, Wang Youzhi. Accumulation conditions and exploration prospects of tight gas reservoirs in the fifth member of the Upper Triassic Xujiahe Formation in Yilong–Pingchang area,Sichuan Basin[J]. China Petroleum Exploration, 2025, 30(1): 42-55.

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