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《ACTA PETROLEI SINICA》 1994-02
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ORIGIN AND MIGRATION OF NATURAL GAS IN ORDOVICIAN RESERVOIR IN SHAN GAN NING BASIN CENTRAL GAS FIELD

Chen Anding(Research Institute of Exploration and Development,Changqing PetroleumExploration Bureau, Qingyang, Gansu)  
Application of carbon isotopes in natural gas by“taking the carbon isotopic ratio in ethane as a criteria to differentiate the properties of organic gas precursors and taking that in methane as a criteria to study the migration of gas in the lateral-diffusion mode”is proposed in this paper based on experimental and field data. Two kinds of natural gas originating sapropelic type of organic matter in the carbonate source-rocks in the Ordovician and from coal-bearing formation in the Carboniferous-permian respectively are differentiated mainly according to carbon isotopic ratio in ethane. The gas from the Ordovician has characteristics such as more negative carbon isotopic ratio in ethane, lower content of C2_+ hydrocarbons and higher concentration of hydrogen sulphide relative to the gas from the Carboniferous-permi-an. Qualitative identification and quantitative calculation show that the natural gas in the Or-dovician reservoirs of the Central gas field is a two-component gas mixture which comes mainly from the Ordovician source rock while those from the Carboniferous is in a small quantity only. The gas which comes from the Carboniferous in the Ordovician reservoirs is found in the eastern part of the field and is associated with the erosive gulleys on the top of the Ordovician. The natural gas in the Ordovician of the central-eastern part of the basin is divided into four migration fields by using the data of carbon isotopic ratio in methane. This paper also discusses the effect of the palaeo-geomorphology,palaeo-Karst and the present structural feature on the distribution of natural gas of different origin and its migration
【CateGory Index】: P618.130.1
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