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张志萍(1980-),女,河北衡水人,硕士,工程师,主要从事油气藏地质研究. E-mail:zhangzp.hdsj@sinopec.com. |
收稿日期: 2025-01-14
修回日期: 2025-05-27
网络出版日期: 2025-09-11
基金资助
中国石化国内上游导向项目(YTBXD-FCZY-2023-1-02-002)
Accumulation conditions and models of natural gas reservoirs in the Xiaoheba Formation of the Lower Silurian in Nanchuan area, Southeast Chongqing
Received date: 2025-01-14
Revised date: 2025-05-27
Online published: 2025-09-11
Supported by
The Domestic Upstream Oriented Project of SINOPEC(YTBXD-FCZY-2023-1-02-002)
渝东南南川地区多口钻遇下志留统小河坝组的页岩气井气测显示异常。为探索小河坝组天然气勘探潜力,综合利用露头、岩心、测井录井、实验分析及地震等资料,分析了南川地区小河坝组天然气成藏条件和成藏模式。结果表明:①南川地区小河坝组为三角洲前缘、前三角洲沉积,主要发育粉砂岩、泥质粉砂岩,厚度较大;②岩性致密,表现出强压实特征,孔隙度平均为0.84%,渗透率平均为0.1×10-3 μm2,属特低孔致密储层,储集空间以裂缝为主,少量溶蚀孔,形成孔隙—裂缝型储层,退汞效率低,储层横向及纵向非均质性强;③气测显示异常与构造相关性不明显,同平台邻井含气差异大,表现出裂缝型气藏特征;④利用曲率及蚂蚁体地震属性预测揭示通源裂缝是小河坝组天然气运移通道;⑤由于小河坝组自身的侧向封挡和上覆韩家店组盖层的封闭,天然气聚集在裂缝中成藏,形成裂缝型成藏模式。研究成果指导了南川地区老井上返压裂测试小河坝组实现勘探突破,对于四川盆地小河坝组及同类型气藏的勘探也具有重要指导意义。
张志萍 , 高全芳 , 倪锋 , 李彦婧 , 何贵松 . 渝东南南川地区下志留统小河坝组砂岩天然气成藏条件及成藏模式[J]. 天然气地球科学, 2025 , 36(12) : 2269 -2279 . DOI: 10.11764/j.issn.1672-1926.2025.06.001
A number of shale gas wells have been drilled with good gas measurement in Xiaoheba Formation in Nanchuan area, Southeast Chongqing. To analyze the natural gas exploration potential of the Xiaoheba Formation, the gas accumulation conditions and accumulation models of the Xiaoheba Formation in Nanchuan area were analyzed based on outcrop, core, well logging, experimental analysis and seismic data. The results show that: (1) The Xiaoheba Formation in the Nanchuan area is a deltaic front and pre-deltaic deposit, mainly composed of siltstone and argillaceous siltstone, with a relatively large thickness. (2) The lithology is tight, showing the characteristics of strong compaction. With an average porosity of 0.84% and an average permeability of 0.1×10-3 μm2, it is an extremely low porosity and tight reservoir. The reservoir space is dominated by micro-fractures and corrosion pores, forming a pore-fracture reservoir. The low mercury removal efficiency indicates that the reservoir has strong horizontal and vertical heterogeneity. (3) There is no obvious correlation with gas measurement and the structure. Adjacent wells on the same platform are different from gas survey locations and thickness, presenting the characteristics of fractured gas reservoirs. (4) Based on the prediction of curvature and seismic properties of the ant body, it is believed that the through-source fractures are the natural gas migration channels of the Xiaoheba Formation. (5) Due to the lateral sealing of Xiaoheba Formation and the sealing of the overlying Hanjiadian Formation, natural gas gathered in the fracture and formed a fractured reservoir accumulation model. The research results guide the Xiaoheba Formation in the upper return fracturing of the old well, which has made a breakthrough in the exploration of Xiaoheba Formation in Nanchuan area. And the research results have important guiding significance to Xiaoheba Formation in Sichuan Basin.
Key words: Tight; Fracture; Accumulation model; Xiaoheba Formation; Nanchuan area
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