INFLUENCE OF SHALE COMPONENTS ON THE PORE DEVELOPMENT DIFFERENCES BETWEEN WUFENG-LONGMAXI FORMATION AND NIUTITANG FORMATION: A Case Study of JY-1 Well in Southeast Chongqing and CY-1 Well in Northwest Hunan
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摘要:
根据页岩样品不同孔径范围的累计孔体积与累计比表面积，结合焦页1井五峰-龙马溪组与慈页1井牛蹄塘组页岩样品的地球化学参数与岩样各矿物组分百分含量，分析页岩组分对两套地层孔隙发育差异的影响.结果显示，TOC与微孔呈正相关关系，表明有机质微孔对页岩孔隙发育提供了一定的贡献，五峰-龙马溪组页岩较牛蹄塘组更为发育有机质微孔.石英、黄铁矿含量与微孔的正相关关系表明，矿物支撑的原生孔与发育的边缘孔为页岩孔隙发育提供了有利贡献.石英与中孔、大孔的不同相关性表明石英根据其生物成因贡献的石英含量对中孔、大孔的保护程度不一.黄铁矿含量与大孔的正相关关系表明黄铁矿可以根据其含量的多寡为大孔提供一定程度的保护，长石与孔隙的负相关关系表明其对孔隙的支撑作用受到了压实作用、复杂构造的影响而不明显.碳酸盐矿物与孔隙的相关性不明显表示基于其较弱刚性、不稳的化学性质与较低含量未对孔隙发育产生明显影响.五峰-龙马溪组页岩较高的刚性矿物含量对储层矿物粒间孔、边缘孔等微孔与中孔、大孔的发育起到了较牛蹄塘组更为有利的影响.黏土矿物与微孔、中孔的负相关关系表明在较强压实作用下黏土矿物间孔隙易收缩，对储层孔隙发育产生不利影响，表明牛蹄塘组经历的更深历史埋藏对牛蹄塘组黏土矿物间孔隙发育起到了更加不利的影响.
Abstract:Based on the accumulative pore volume and specific surface area by pore diameter of shale samples from JY-1 well of Wufeng-Longmaxi Formation and CY-1 well of Niutitang Formation, combined with the geochemical parameters and percentage of mineral components in samples, the paper analyzes the influence of shale components on the pore development differences between the two formations. The results show that TOC is positively correlated with micropores, indicating the organic micropores contribute to the development of shale pores, and organic micropores are more developed in the shale of Wufeng-Longmaxi Formation than that in Niutitang Formation. The positive correlation between quartz-pyrite contents and micropores indicates the primary pores and developed marginal pores contribute to the development of shale pores. The different correlations between quartz and meso-and macropores reveal the different protection degrees of quartz to the two by biogenic quartz content. The positive correlation between pyrite content and macropores reflects that pyrite can protect macropores to a certain extent in terms of pyrite content. The negative correlation between feldspar and pores shows the less obvious support of feldspar on pores due to the influence of compaction and complex structure. The unobvious correlation between carbonate minerals and pores shows the weak rigidity and instability of chemical properties and low content have no significant influence on pore development. Compared with Niutitang Formation, the high content of rigid minerals in the shale of Wufeng-Longmaxi Formation has a more favorable influence on the development of micropores (such as intergranular and marginal pores), mesopores and macropores. The negative correlations between clay minerals and micro- and mesopores indicate the intermineral pores easy to shrink under strong compaction have a negative effect on the pore development of reservoir, reflecting that the deep burial of Niutitang Formation has an unfavorable effect on the development of intermineral pores.
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Key words:
- Wufeng-Longmaxi Formation /
- Niutitang Formation /
- TOC /
- shale /
- pore /
- middle-lower Yangtze Valley area
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