Oil and gas sources from the Luliang Oil Field in the Junggar Basin, (Xinjiang)

The geological chromatographic effect, absorption of mineral in conveying beds and thermal evolution of oil and gas in reservoir rocks may cause the variability of biomarkers and uncertainty of conventional studies of oil and gas sources. There are depressions around the Luliang Oil Field, and all the depressions are expected to be the provenances of oil and gas in the oil field. The present study deals with the structural evolution, hydrocarbon-generating capacity, geochemical signatures and evolution of conveying beds in the surrounding depressions. The correlation of the biomarkers such as tritrepane C₂₀, C₂₁ and C₂₃, and sterane C₂₇, C₂₈ and C₂₉ has led us to conclude that the principal sources of the oil in the Luliang Oil Field are derived from the Permian source rocks in the western depression of the Basin-1 well, and those of the gas are derived chiefly from the Jurassic source rocks in the western depression of the Basin-1 well.