Genesis of Abnormal Evolution of Clay Minerals at Different Diagenetic Stages in Taibei Depression of Tuha Basin
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摘要: 台北凹陷粘土矿物的成岩演化在纵向上虽然存在伊/蒙混层中蒙脱石层的基本正常成岩变化规律, 但是, 在各成岩阶段其他粘土矿物组分的变化中却出现了多种异常现象.主要以鄯善构造为例, 经分析研究后提出了该区粘土矿物在各成岩阶段出现异常变化的多种原因, 如: 存在原沉积母岩、沉积水介质、煤系地层成岩产生的酸性流体、暗色泥岩热演化生成的有机酸及油层中有机酸等因素的影响, 这些因素不同程度的作用造成了该区各成岩阶段粘土矿物的异常发育特征Abstract: In Taibei depression, the diagenetic evolution of the clay minerals indicates that the smectite in smectite/illite mixed layer is associated with the basic normal genetic variation with depth. However, the other clay minerals are associated with various anomalous phenomena at different diagenetic stages. The detailed investigation of diagenesis in Shanshan structure indicates that several factors, such as sedimentary provenance, aqueous medium, acidic fluid generated by diagenesis of coal measure strata, organic acid generated in the course of thermal evolution and organic acid existing in oil layer, are responsible for the anomalous variation of the clay minerals at different diagenetic stages. These factors have resulted, to different extents, in anomalous development of the clay minerals at different diagenetic stages in this region.
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Key words:
- Taibei depression /
- clay mineral /
- anomalous evolution /
- genesis /
- provenance /
- coal measure strata /
- aqueous medium
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图 1 鄯科1井与台参1井在台北凹陷中的位置
Fig. 1. Sketch map showing position of Shanke-1 well and Taican-1 well in Taibei depression
图 2 鄯善构造钻遇地层泥岩粘土矿物转化特征分析
S/I.伊蒙混层; K.高岭石; I.伊利石; C.绿泥石
Fig. 2. Characteristic of clay minerals evolution in mudstone of drilling-meet in the Shanshan structure
图 3 鄯善深层晚成岩作用A2时期的砂岩的薄片鉴定与电镜扫描
a.含凝灰质岩屑砂岩(50倍正交), 5 130.43 m; b.方解石交代喷出岩岩屑(50倍正交), 5 049.80 m; c.石英加大Ⅲ级, 表面蚀变成I/S混层(1 790倍扫描电镜), 4 712.52 m; d.绿泥石交代石英(5 000倍扫描电镜), 5 279.30 m
Fig. 3. Thin-section analysis and electron scanning micrograph of sandstone in the middle time of late diagenetic stage at the Shanshan structure
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