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首页> 外文期刊>Interpretation >Porosity evolution mechanisms of marine shales at over-maturity stage: Insight from comparable analysis between Lower Cambrian and Lower Silurian inside and at the margin of the Sichuan Basin, South China
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Porosity evolution mechanisms of marine shales at over-maturity stage: Insight from comparable analysis between Lower Cambrian and Lower Silurian inside and at the margin of the Sichuan Basin, South China

机译：船舶超级阶段的孔隙率进化机制：下寒册和下艾尔建筑内部和下部南部南部南部的比较分析的洞察力

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摘要

To figure out porosity evolution mechanisms of marine shales inside and at the margin of the Sichuan Basin, South China, we measured samples selected from Lower Cambrian Qiongzhusi shales and Lower Silurian Longmaxi shales by a combination of X-ray diffraction, geochemistry measurement, focused ion beam milling and scanning electron microscopy imaging, and N-2/CO2 adsorption. It was suggested that shales of the upper Qiongzhusi Formation (a marine shallow continental-shelf setting) and the Longmaxi Formation (a marine abyssal continental-shelf setting) possessed larger pore volumes and larger pore surface areas than those of the lower Qiongzhusi Formation (a marine abyssal continental-shelf setting). Pores, in terms of pores of mineral frameworks, pores associated with clay minerals, dissolved pores, and organic matter (OM)-hosted pores, were all observed in the upper Qiongzhusi Formation and Longmaxi Formation, whereas none of the four types of pores developed well in the bottom of the Qiongzhusi Formation. Moreover, migrated OM is superior to depositional OM in the contribution of the pore space, in terms of pore productivity and pore protection. Good sealing abilities of the upper Qiongzhusi Formation and Longmaxi Formation allow more migrated OM and gaseous hydrocarbon retention than the lower Qiongzhusi Formation with an unconformity beneath acting as a channel of liquid and gaseous hydrocarbon migration, which bring about better pore properties. Finally, through the above analysis, the pore evolution mode has been established to gain insights for mechanisms of destruction, formation, and preservation of pores ranging from original sedimentary to metamorphic stage (0%R-o-3.5%R-o). Mechanisms of pore destruction contain mechanical compaction, chemical cementation, and OM carbonation. Mechanisms of pore generation comprise thermal pyrolysis of OM, transformation of clay minerals, and dissolution of soluble minerals. Mechanisms of pore preservation include mechanical stability of rigid grains, chemical stability of hydrophobic OM, and gas supporting through overpressure.
机译：为了弄清楚南方四川盆地边缘和在南方河口边缘的孔隙度演变机制，我们通过X射线衍射，地球化学测量，聚焦离子的组合测量从下寒武纪Qiongzhusi Hales和下硅兰龙丸子的样品。光束铣削和扫描电子显微镜成像和N-2 / CO 2吸附。有人建议，上琼卓山脉的神话（海洋浅欧式货架设置）和龙玉米形成（海洋深度欧式货架设置）具有比下Qiongzhusi形成的更大的孔体积和较大的孔表面区域（a海洋深海大陆货架设置）。在矿物框架的毛孔方面，与粘土矿物质，溶解的孔和有机物质（OM）相关的孔，在上Qiongzhusi形成和Longmaxi形成中观察到毛孔，溶解孔和有机物质（OM），而没有出现四种类型的孔隙良好在琼楚斯的底部形成。此外，迁移的OM在孔隙空间的贡献中优于沉积OM，就孔隙生产率和孔隙保护而言。上Qiongzhusi形成和Longmaxi形成的良好密封能力允许比Qiongzhusi形成更迁移的OM和气态碳氢化合物保持，其具有作为液体和气态烃迁移的通道的不整合性，这引起了更好的孔隙性质。最后，通过上述分析，已经建立了孔隙演化模式，以获得从原始沉积到变质阶段的孔隙，形成和保存机制的洞察力（0％R-3.5％R-O）。孔破坏机制含有机械压实，化学胶结和OM碳酸化。孔产生机制包括OM的热解水，粘土矿物的转化，以及可溶性矿物的溶解。孔保存机制包括刚性晶粒的机械稳定性，疏水OM的化学稳定性，以及通过过压的气体支撑。

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  • 来源
    《Interpretation》 |2018年第3期|共19页
  • 作者

    Li Xin; Jiang Zhenxue; Song Yan; Zhai Gangyi; Bao Shujing; Li Zhuo; Tang Xianglu; Wang Pengfei; Li Tingwei; Wang Guozhen; Zhou Wen; Qiu Hengyuan; Miao Yanan;

  • 作者单位

    China Univ Petr State Key Lab Petr Resources &

    Prospecting Beijing 102249 Peoples R China;

    China Univ Petr State Key Lab Petr Resources &

    Prospecting Beijing 102249 Peoples R China;

    China Univ Petr State Key Lab Petr Resources &

    Prospecting Beijing 102249 Peoples R China;

    China Geol Survey Geosci Documentat Ctr Beijing 100083 Peoples R China;

    China Geol Survey Geosci Documentat Ctr Beijing 100083 Peoples R China;

    China Univ Petr State Key Lab Petr Resources &

    Prospecting Beijing 102249 Peoples R China;

    China Univ Petr State Key Lab Petr Resources &

    Prospecting Beijing 102249 Peoples R China;

    China Geol Survey Geosci Documentat Ctr Beijing 100083 Peoples R China;

    China Univ Petr State Key Lab Petr Resources &

    Prospecting Beijing 102249 Peoples R China;

    China Univ Petr State Key Lab Petr Resources &

    Prospecting Beijing 102249 Peoples R China;

    China Univ Petr State Key Lab Petr Resources &

    Prospecting Beijing 102249 Peoples R China;

    China Univ Petr State Key Lab Petr Resources &

    Prospecting Beijing 102249 Peoples R China;

    China Natl Oil &

    Gas Explorat &

    Dev Corp Beijing 100034 Peoples R China;

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  • 正文语种 eng
  • 中图分类 地球物理学;
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