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谢婷,李琦,王向华,等. 牛蹄塘与陡山沱组页岩孔隙发育差异性与主控因素分析——以鄂西某井为例[J]. 科学技术与工程, 2020, 20(32): 13148-13157.
XIE Ting,WANG Xiang-hua,et al.Study on Pore Development Differences and Controlling Factors of Niutitang and Doushantuo Formations Shale—— Taking a well in Western Hubei as an example[J].Science Technology and Engineering,2020,20(32):13148-13157.
牛蹄塘与陡山沱组页岩孔隙发育差异性与主控因素分析——以鄂西某井为例
Study on Pore Development Differences and Controlling Factors of Niutitang and Doushantuo Formations Shale—— Taking a well in Western Hubei as an example
投稿时间:2019-05-30  修订日期:2020-08-06
DOI:
中文关键词:  微观孔隙类型及特征  矿物组分  有机质丰度  热演化程度  埋藏深度
英文关键词:micropore type and characteristics  mineral composition  organic matter abundance  thermal evolution degree  burial depth
基金项目:国家自然科学基金(41576066)
           
作者单位
谢婷 中国地质大学(北京)
李琦 中国地质大学(北京)
王向华 中国地质大学(北京)
于伟欣 中国地质大学(北京)
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中文摘要:
      鄂西地区是长江中下游地区页岩气勘探开发的重点区域,其中震旦系、寒武系等层系均获页岩气流,因此,对其储层微观孔隙结构特征及其影响因素进行研究具有十分重要的意义。通过对研究区页岩样品进行FE-SEM观察、TOC含量测定、全岩及粘土X-衍射分析及其岩石物性等的分析,明确了研究区储层孔渗特征及储集空间类型、有机质丰度及成熟度、矿物组成等。研究表明,牛蹄塘组页岩核磁总孔隙度及渗透率均大于陡山沱组页岩,陡山沱组页岩有机质孔隙发育较好且发育更多白云石晶间孔,部分层段发育方解石溶蚀晶锥及溶蚀坑洞;TOC含量及有机质热演化程度与有机质孔隙呈现负相关关系;矿物组分中,石英及长石含量与核磁总孔隙度呈现正相关关系,而白云石含量与其呈现负相关关系,黏土矿物与核磁总孔隙度的相关性并不明显;此外,核磁总孔隙度与深度呈负相关关系,表现在随深度的加深,核磁孔隙度总体呈波动下降趋势。分析认为:矿物组分、有机质丰度及热演化程度、埋藏深度是影响页岩储集能力的重要因素,有机质的富集有利于页岩气的生成与吸附,脆性矿物的存在提高了储层的脆性,有利于储层的增产改造;埋藏深度影响储集空间的保存条件优劣。
英文摘要:
      Western Hubei is the key area for shale gas exploration and development in the middle and lower reaches of the Yangtze River. Shale gas flow is obtained in Sinian and Cambrian strata. Therefore, it is of great significance to study the micro-pore structure and its influencing factors of the reservoir. Through FE-SEM observation, TOC content determination, X-ray diffraction analysis of whole rock and clay and analysis of rock physical properties of shale samples in the study area, pore-permeability characteristics and reservoir space types, organic matter abundance and maturity, mineral composition of the reservoir in the study area are defined. The results show that the total nuclear magnetic porosity and permeability of Niutitang Formation shale are higher than those of Doushantuo Formation shale, Doushantuo Formation shale has more dolomite intergranular pore, calcite cone and dissolution pit in some sections, TOC content and thermal evolution degree of organic matter are negatively correlated with organic matter pore, quartz and feldspar content in mineral components are positively correlated with total nuclear magnetic porosity. The relationship between dolomite content and total porosity is negative, and the correlation between clay minerals and total porosity is not obvious. In addition, total porosity and depth are negatively correlated, which shows that with the deepening of depth, the overall nuclear magnetic porosity fluctuates and decreases. The analysis shows that mineral composition, organic matter abundance, thermal evolution degree and burial depth are important factors affecting shale reservoir capacity, organic matter enrichment is conducive to shale gas generation and adsorption, brittle minerals improve the brittleness of the reservoir, is conducive to reservoir stimulation and transformation, and burial depth affects the preservation conditions of the reservoir space.
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