四川盆地中二叠统中-粗晶白云岩成因

doi:10.11743/ogg20140409

Abstract

Abstract:

Observation of the Middle Permian outcrops and thin sections of cores from typical wells in Sichuan Basin and its periphery reveals that the Middle Permian consists mainly of micro-dolomite,medium-macro-crystalline dolomite and calcitic dolomite.And the petrophysical properties analysis shows that reservoir quality of the medium-macro-crystalline dolomite is the best,so it can act as effective reservoir.,Various geochemical analyses in combination with the geological background indicate the medium-macro-crystalline was formed by the deep thermal fluids.There are five major evidences concerning their genesis.The medium-macro-crystalline shows the characteristics of saddle-dolomites and is associated with some low temperature hydrothermal minerals;Gas-liquid hydrocarbon fluid inclusions with homogenization temperature higher than the surrounding rocks occur in the medium-macro-crystalline,,and the salinity of two phase fluid inclusions tested based on the freezing point temperature is three to five times of normal sea water,indicating high salinity digenetic fluids;The stable isotope values are extremely biased,and they all are less than -9‰ and mostly are up to -13‰;Their Sr isotopes have the characteristics of mantle-derived medium-macro-crystalline dolomite,indicating the existence of deep thermal fluids;The lateral and vertical distributions of dolomite vary dramatically,and dolomites are found to distribute along the deep-large faults and in areas with volcanic rocks.Most of the intergranular dissolved pores of medium-macro-crystalline dolomite are filled by asphalt.Comprehensive analysis based on the bury history of typical wells,homogenization temperature of fluid inclusions and hydrocarbon generation history of source rock reveals that the medium-macro-crystalline dolomites were formed early,at least prior to the Middle-Late Triassic,when large amount of hydrocarbons were charged.Based on the above mentioned analysis,a hydrothermal genetic model was established for the medium-macro-crystalline dolomite was established by using the typical wells and seismic profiles.

Key words: hydrothermal fluid, genetic model, dolomite, Middle Permian, Sichuan Basin

CLC Number:

TE121.1

Jiang Qingchun, Hu Suyun, Wang Zecheng, Wang Tongshan, Li Qiufen, Zhai Xiufen. Genesis of medium-macro-crystalline dolomite in the Middle Permian of Sichuan Basin[J]. Oil & Gas Geology, 2014, 35(4): 503-510.

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Genesis of medium-macro-crystalline dolomite in the Middle Permian of Sichuan Basin

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