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ֻ42 ज ֻ4 ௹ imentary rocks We summarize
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the occurrence composition genesis of natural analcime and discuss its impact on reservoirs based on previous
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researches The results show that analcime a kind of silicate mineral containing crystalline water and of framework
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structure is characterized by a silica oxygen tetrahedron on map view to form a closed ring and a cage structure in D
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visualization space the pore pathways in which are conducive to dissolution There are five typical types of natural
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analcime in terrestrial lacustrine basins among which the analcime with intergranular cements and fracture fillings is
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euhedral and the exhalative analcime comes in two kinds of occurrence namely porhyritic texture and discontinuous
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coarse grained laminae The compositional differences of analcime concentrate on the content of Na and K ions the K ion
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content tends to be higher and the Si Al ratio in analcime mainly ranges from to when it comes to alkaline
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volcanic rock as the host rock Among the four categories of natural analcime in terms of genesis that in terrestrial
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lacustrine basins is mainly derived from diagenesis and hydrothermal exhalation In all sedimentary facies is key in the
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formation and disso