Fluid inclusions are commonly observed in various stages during the diagenetic evolution and the generation, migration and arcumulation of hydrocarbons in LowerPermian carbonate rocks in the Xichang Basin, providing d...Fluid inclusions are commonly observed in various stages during the diagenetic evolution and the generation, migration and arcumulation of hydrocarbons in LowerPermian carbonate rocks in the Xichang Basin, providing direct physico-chemical evidencefor the process. Altogether seven stages can be recognized, i.e., the penecontemporaneous, early and mid-late diagenetic stages, the epidiagenetic stage and the eary, middleand late reburying stages. Karst and dissolution pores and structural fissures developedduring the epidiagenetic and reburying stages constitute the major reservoirs for hydrocarbon accumulation. Oil generation and migration began in the early reburying stagein Late Permian time and decloped to its climax in the middle reburying stage in theTriassic period, followed by extensive generation and migration of natural gases duringthe late stage of reburying in tbe Jurassic and later periods. The generation, migrationand accumulation of hydrocarbons are closely related to Hercynian basalt eruption andIndosinian and Yenshanian tecto-magmatism.展开更多
文摘Fluid inclusions are commonly observed in various stages during the diagenetic evolution and the generation, migration and arcumulation of hydrocarbons in LowerPermian carbonate rocks in the Xichang Basin, providing direct physico-chemical evidencefor the process. Altogether seven stages can be recognized, i.e., the penecontemporaneous, early and mid-late diagenetic stages, the epidiagenetic stage and the eary, middleand late reburying stages. Karst and dissolution pores and structural fissures developedduring the epidiagenetic and reburying stages constitute the major reservoirs for hydrocarbon accumulation. Oil generation and migration began in the early reburying stagein Late Permian time and decloped to its climax in the middle reburying stage in theTriassic period, followed by extensive generation and migration of natural gases duringthe late stage of reburying in tbe Jurassic and later periods. The generation, migrationand accumulation of hydrocarbons are closely related to Hercynian basalt eruption andIndosinian and Yenshanian tecto-magmatism.
