南华北地区石炭—二叠系砂岩和泥岩中粘土矿物的形成与转化

Forming and transforming of clay minerals of sandstone and mudstone in Carboniferous-Permain system,south North China area

摘要: 区内砂岩中的粘土矿物主要是自生的高岭石、绿泥石和伊蒙混层,而泥岩中的粘土矿物是伊蒙混层和高岭石,少量绿泥石,未见蒙脱石.砂岩和泥岩中粘土矿物的转化具有相似的水介质和地温条件,都反映出在中—晚成岩期形成,而且与烃类的排出和运移密切相关.泥岩中粘土矿物转化和脱水作用为砂岩输送流体和释放溶解物质,而且泥岩中有机质的脱羟基向砂输送酸性水,促进砂岩中骨架颗粒溶解、次生孔隙的产生.
- 砂岩 /
- 泥岩 /
- 粘土矿物
Abstract: The dominant of clay minerals in sandstone within the area were anthigenic kaolinite,chlorite and illite-smectite,but illite-smectite,kaolinite,less chlorite in mudstone.Transformation of clay minerals in sandstone and mudstone had similar condition of water-bearing medium and earth's temperature,and closely related to hydrocarbon generation and migration.It is indicated that the authigenic clay minerals in sandstone and mudstone were both formed in middle-late diagenesis age.The transformation and dehydration of clay minerals in mudst one provided fluid and dissolution matter for sandst one.The decarboxy lation of organic matter in mudst one provided fluid and acid-water for sandst one,so facilitated the dissolution of detrital grains in sandstone and the generat ion of second porosity.
- sandstone /
- mudstone /
- clay minerals