Geochemical effects of hydrocarbon migration and characteristics of accumulation in the south slope of the Weixinan depression
Weixinan depression is a rich hydrocarbon generation sub-sag;oil and gas reservoirs have be found in the Jiao-wei Formation,Weizhou Formation,Liushagang Formation,and Carboniferous strata.The relationship between the oil and the geochemical characteristics of crude oil is identified by comparing them.Based on similar maturity of crude oil in this re-gion,adopt the migration fractionation effect means for oil and gas migration direction specified Through the alkanes distribu-tion of whole hydrocarbon chromatogram to establish a suitable migration fractionation index,to use the characteristics of DST test oil physical property and composition to analysis of the migration path.By alkyl benzothiophene and nitrogen compounds migration differentiation phenomenon in the migration process to prove oil and gas lateral migration and vertical migration.Considering spatial superimposed relationship of transportation systems in this region,analysis of the characteristics of crude oil transported accumulation pattern in this area.Studies have shown that oil and gas generated from the central hydrocarbon source through faults unconformity surface transportation systems shipped to shallow and high formation reservoirs in the south slope belt.
the south slope of Weixinan depressionmigrationgeochemical characteristicsaccumulation characteristics
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