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| 1 | 采用机器学习分割算法和扫描电镜分析页岩微观孔隙结构显示文摘以五峰-龙马溪组页岩样品为例,进行拼接扫描电镜(MAPS)和聚焦离子束扫描电镜(FIB-SEM)测试,建立样品二维和三维灰度图像,采用机器学习分割算法划分为孔隙、有机质、矿物骨架和黄铁矿。根据孔隙周围矿物类型和形状,将孔隙细分为有机孔、无机孔和微裂缝,并统计含量和孔径分布。结果表明与常规灰度阈值分割算法相比,该方法准确识别灰度异常区域的组分类型,实现孔径10~200 nm页岩孔隙的精确划分;受分辨率限制,SEM图像识别的页岩总孔隙度与有机质含量与实验结果存在差异。 | 刘学锋 张晓伟 曾鑫 程道解 尼浩 李潮流 俞军 胡法龙 李长喜 魏宝君 | 2022 | 中国石油大学学报(自然科学版)2022，46，1： | 7 |
| 2 | 页岩剪切摩擦与非稳态滑移特性实验显示文摘龙一1亚段页岩是川南页岩气开发的主要目的层,实践表明水平井单井产气量对井轨迹所在小层较为敏感.龙一1亚段页岩各层脆性矿物组分、弹性模量变化幅度小,采用常规页岩脆性评价方法和模型不能有效评价川南龙一1亚段各小层页岩的可压性,借鉴地震学地震成核原因研究思路,提出利用稳态-非稳态破坏特征来表征各小层可压性.优化设计一种页岩剪切摩擦、稳态-非稳态特性实验方法,利用川南页岩地面露头进行线切割制样开展相关实验测试,分析研究页岩摩擦系数受层理性构造、矿物组分、法向应力大小的影响,表征量化不同矿物组分下的页岩稳态-非稳态特征,确定了速度弱化向速度强化转换的粘土矿物含量临界值.以川南昭通YS108井区龙一1亚段页岩储层为例,对各小层可压性进行整体评价,得到:龙一^1~21层较易开启剪切滑移,且易形成网状裂纹,储层整体可压性好;龙一^31层较难开启剪切滑移,但裂纹为单一裂纹、网状裂纹过渡状态,储层整体可压性较差;龙一^41层较易开启剪切滑移,但裂纹则呈现单一状态,储层整体可压性较差. | 付利 申瑞臣 庞飞 杨恒林 陈科 | 2019 | 地球科学2019，44，11： | 1 |
| 3 | Petrophysics characteristics of coalbed methane reservoir: a comprehensive review显示文摘Petrophysics of coals directly affects the development of coalbed methane(CBM).Based on the analysis of the representative academic works at home and abroad,the recent progress on petrophysics characteristics was reviewed from the aspects of the scale-span porefracture structure,permeability,reservoir heterogeneity,and its controlling factors.The results showed that the characterization of pore-fracture has gone through three stages:qualitative and semiquantitative evaluation of porefracture by various techniques,quantitatively refined characterization of pore-fracture by integrating multiple methods including nuclear magnetic resonance analysis,liquid nitrogen,and mercury intrusion,and advanced quantitative characterization methods of pore-fracture by high-precision experimental instruments(focused-ion beam-scanning electron microscopy,small-angle neutron scattering and computed tomography scanner)and testing methods(m-CT scanning and X-ray diffraction).The effects of acoustic field can promote the diffusion of CBM and generally increase the permeability of coal reservoirs by more than 10%.For the controlling factors of reservoir petrophysics,tectonic stress is the most crucial factor in determining permeability,while the heterogeneity of CBM reservoirs increases with the enhancement of the tectonic deformation and stress field.The study on lithology heterogeneity of deep and high-dip coal measures,the spatial storage-seepage characteristics with deep CBM reservoirs,and the optimizing production between coal measures should be the leading research directions. | Qifeng JIA Dameng LIU Yidong CAI Xianglong FANG Lijing LI | 2021 | Frontiers of Earth Science2021，15，2： | 1 |
| 4 | 湘西地区寒武系牛蹄塘组页岩孔隙发育特征及影响因素显示文摘湘西地区寒武系牛蹄塘组页岩具有厚度大、埋藏适中、有机质丰度高及热演化程度高等特点,具有较大的页岩气勘探开发潜力,为此,以牛蹄塘组富有机质页岩为研究对象,通过X射线衍射分析划分页岩岩相,利用场发射扫描电镜、CO_(2)及N_(2)吸附并结合分形特征对不同岩相页岩孔隙发育特征及其影响因素进行研究。研究结果表明:牛蹄塘组页岩孔隙类型主要包括有机孔、无机孔和微裂缝,岩相可分为硅质页岩、钙质页岩、混合硅质页岩和含泥硅质页岩,其中硅质页岩的有机孔最发育;页岩中的孔隙体积以介孔体积为主,比表面积主要以微孔表面积为主,不同岩相页岩的孔径分布特征相似,但硅质页岩的孔隙体积和比表面积显著比钙质页岩、混合硅质页岩和含泥硅质页岩的高,孔隙体系非均质性也更强;受有机碳质量分数和矿物组成的影响,牛蹄塘组页岩的孔隙结构出现明显差异,有机碳质量分数是控制孔隙发育的主要因素,石英对微孔发育有一定贡献,而黏土矿物与介孔的发育有关,但整体上矿物组成对孔隙发育影响较小;在湘西地区牛蹄塘组4种页岩岩相中,牛一段和牛二段底部的硅质页岩有机碳质量分数最高,有机孔较发育,孔隙体积和比表面积均显著比其他3种岩相页岩的高,可作为页岩气勘探的目的层段。 | 司陈洋 谭静强 王张虎 马啸 | 2022 | 中南大学学报(自然科学版)2022，53，9： | 0 |
| 5 | Microstructure Characterization of a Biogenic Shale Gas Formation——Insights from the Antrim Shale,Michigan Basin显示文摘Biogenic gas shales,predominantly microbial in origin,form an important class of organicrich shale reservoirs with a significant economic potential.Yet large gaps remain in the understanding of their gas generation,storage,and transport mechanisms,as previous studies have been largely focused on mature thermogenic shale reservoirs.In this study,the pore structure of 18 Antrim Shale samples was characterized using gas adsorption(CO2 and N2).The results show that most of the Antrim Shale samples are rich in organic matter content(0.58 wt.%to 14.15 wt.%),with highest values found in the Lachine and Norwood members.Samples from the Paxton Member,characterized by lower organic content,have smaller micropore surface area and micropore volume but larger meso-macro pore surface area and volume.The deconvolution results of the pore size distribution from the N2 adsorption indicate that all of the tested Antrim Shale samples have similar pore groups.Organic matter in the Antrim Shale hosts micro pores instead of meso-macro pores,while clay minerals host both micro and meso-macro pores.Mineralrelated pores play a primary role in the total porosity.The biogenic Antrim Shale,therefore,has different pore structures from other well-studied thermogenic gas shales worldwide. | Kouqi Liu Natalia Zakharova Thomas Gentzis Adedoyin Adeyilola Humberto Carvajal-Ortiz Hallie Fowler | 2020 | Journal of Earth Science2020，31，6： | 0 |
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