首页|黔东南地区牛蹄塘组页岩孔隙结构多尺度表征及其对页岩气富集的影响

黔东南地区牛蹄塘组页岩孔隙结构多尺度表征及其对页岩气富集的影响

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  • 国家科技期刊平台
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  • NSTL
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[研究目的]研究黔东南地区牛蹄塘组页岩孔隙结构特征及其对页岩气富集的影响,抛开不利因素,为黔东南地区页岩气勘探提供建议.[研究方法]通过聚焦离子束扫描电镜(FIB-SEM)、场发射扫描电镜(FE-SEM)和氮气吸附等手段,对页岩微纳米孔隙结构进行多尺度表征,并结合研究区牛蹄塘组页岩的生烃及埋藏史,研究构造运动与孔隙结构关系,进而分析对页岩气富集的影响.[研究结果]牛蹄塘组页岩主要发育毫米级微裂缝、微米级黄铁矿晶间孔以及纳米级有机质孔隙,以墨水瓶状孔隙和平板结构的狭缝孔为主,孔隙结构复杂;结合FIB-SEM三维重构结果,有机质在页岩中占比较高,其孔隙度在 0.04%～2.48%,对总孔隙的贡献率介于 14%～96%,与有机质共生的黄铁矿晶间孔是沟通裂缝的主要孔隙类型;该地区页岩气赋存状态以欠饱和的吸附气为主,游离气含量偏低.[结论]牛蹄塘组页岩大量构造裂缝,沟通了有机质孔及黄铁矿晶间孔,改变了原有孔隙结构,致使原位聚集的页岩气沿裂缝逸散,是牛蹄塘组页岩含气量低的关键因素.热演化程度适中、构造保存好的区域是古隆起周缘下一步页岩气勘探的有利方向.
Multi-scale characterization of shale pore structure of Niutitang Formation in southeastern Guizhou and its influence on shale gas enrichment
This paper is the result of oil and gas exploration engineering.[Objective]It is necessary to study the pore structure characteristics of Niutitang Formation shale in Southeast Guizhou and its influence on shale gas enrichment,avoid unfavorable factors,and provide suggestions for shale gas exploration in Southeast Guizhou.[Methods]Multi-scale characterization of the shale micro-nano pore structure is carried out by means of focused ion beam scanning electron microscopy(FIB-SEM),FE-SEM,and nitrogen adsorption.Combined with the hydrocarbon generation and burial history of the Niutitang Formation shale in the study area,the relationship between tectonic movement and pore structure is studied,and its control effect on shale gas enrichment is analyzed.[Results]The Niutitang Formation shale mainly develops millimeter-scale micro-cracks,micron-scale pyrite intercrystalline pores and nano-scale organic pores,mainly ink bottle-shaped pores and slit pores with a flat plate structure,and the pore structure is complex.Combined with the results of FIB-SEM three-dimensional reconstruction,organic matter accounts for a relatively high proportion of shale,with a porosity of 0.04%-2.48%and a contribution rate of 14%-96%to the total porosity.The pyrite crystals co-existing with organic matter Pores are the main type of pores that communicate fractures,the shale gas in this area is dominated by undersaturated adsorbed gas,and the free gas content is low.[Conclusions]A large number of structural fractures in the Niutitang Formation shale have connected organic matter pores and pyrite intercrystalline pores,and changed the original pore structure,causing the in-situ accumulated shale gas to escape along the fractures,which is a key factor in the low gas content of the shale of the Niutitang Formation.Finding areas with moderate thermal evolution and well-preserved structures is a favorable direction for shale gas exploration on the periphery of paleo-uplifts.

shale gaspore structurethree-dimensional reconstructionperiphery of paleo-upliftpreservation conditionsoil and gas exploration engineeringSoutheast Guizhou

葛明娜、包书景、石砥石、马勇、张金川、张琴、张立勤、林燕华、王婷

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中国地质调查局油气资源调查中心, 北京 100083

多资源协同陆相页岩油绿色开采全国重点实验室, 黑龙江 大庆 163712

中国石油大学(北京), 北京 102249

中国地质大学(北京), 北京 100083

中国石油勘探开发研究院, 北京 100083

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页岩气 孔隙结构 三维重构 古隆起周缘 保存条件 油气地质调查工程 黔东南地区

国家科技重大专项国家自然科学基金重点项目中国地质调查局项目

2016ZX0503442130803DD20230257

2024

10.12029/gc20210923001

中国地质
中国地质调查局

中国地质

CSTPCD北大核心
影响因子：2.317
ISSN：1000-3657
年,卷(期)：2024.51(1)
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