Genesis of Oil and Gas in Sikeshu Sag in the Southern Margin of Junggar Basin

doi:10.7657/XJPG20200104

Abstract

Abstract:

The oil found in the Sikeshu sag in the southern margin of Junggar basin is the light oil with associated wet gas, but the properties of the oil and gas in different regions are different and there are some disputes about the hydrocarbon sources. The samples of the Middle-Lower Jurassic and Middle-Upper Triassic source rocks obtained from the oucrops in the southern margin are selected. Based on the analysis of rock pyrolysis, choloroform asphalt A, gas chromatography and organic petrology and combined with geochemical analysis of the source rocks, the paper analyzes the geochemical properties of the source rocks of Triassic, Jurassic and Paleogene in the Sikeshu sag, determines the organic phases of the source rocks and discusses the genesis and origin of the oil and gas. The study results show that the light oil and gas in the Sikeshu sag mainly come from the source rocks of the Lower Jurassic Badaowan formation, probably from the Middle-Upper Triassic source rocks; the oil in Dushanzi oilfield and the Neogene Xihu anticline mainly comes from Jurassic or Triassic source rocks, partial oil from the source rocks of the Paleogene Anjihaihe formation.

Key words: Junggar basin, Sikeshu sag, light oil, source rock, organic phase, hydrocarbon genesis

CLC Number:

TE112.111

REN Jiangling, WANG Feiyu, ZHAO Zengyi, ZHANG Yunpei, MI Julei, LIU Cuimin. Genesis of Oil and Gas in Sikeshu Sag in the Southern Margin of Junggar Basin[J]. Xinjiang Petroleum Geology, 2020, 41(1): 25-30.

Figures/Tables 7

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