Study on Geochemical Characteristics and Genesis of Upper Paleozoic Natural Gas in the Perimeter of Shawan Sag, Junggar Basin

doi:10.3969/j.issn.1006-6535.2022.01.003

Abstract

Abstract: To address the problem of poor understanding of the genesis and source of the Upper Paleozoic natural gas in the perimeter of Shawan Sag, Junggar Basin, the simulation and experiment of source rock pyrolysis gas were conducted to work out the genesis and sources of the Upper Paleozoic natural gas in the perimeter of Shawan Sag based on the carbon isotope distribution of pyrolysis gas, as well as the natural gas components, carbon isotopes, light hydrocarbon composition and geochemical characteristics of associated crude oil. The results showed that there were six types of gas genesis in the study area. Type Ⅰ natural gas was derived from the source rocks of Jiamuhe Formation with a δ¹³C₂ value greater than -26.0‰; Type Ⅱ natural gas was biogas with negative δ¹³C₁ value and extremely high aridity coefficient; Type Ⅲ natural gas was derived from the source rocks of Jiamuhe Formation and the source rocks of Lower Wuerhe Formation, with an aridity coefficient of greater than 0.95, and δ¹³C₂ value of about -26.0‰; Type Ⅳ natural gas was derived from the source rocks of Lower Wuerhe Formation, with δ¹³C₂ value ranging from -27.5‰ to -26.9‰; Type Ⅴ natural gas mainly originated from the source rocks of Lower Wuerhe Formation and Fengcheng Formation, among which, the natural gas with a δ¹³C₂ value of not less than -29.0‰ was from Lower Wuerhe Formation and the natural gas with a δ¹³C₂ value of less than -29.0‰ was mainly from Fengcheng Formation; Type Ⅵ natural gas originated from the source rocks of Fengcheng Formation with a δ¹³C₂ value of less than -31.0‰. There are three types of effective gas source rocks in the study area, including humic source rocks of Permian Jiamuhe Formation, humic source rocks of Lower Wuerhe Formation and sapropelic source rocks of Fengcheng Formation. The study results give a answer to the gas source problem of the Upper Paleozoic in the perimeter of Shawan Sag, and provide a basis for the study on natural gas exploration and reservoir accumulation in the study area.

Key words: natural gas, thermal simulation, Upper Paleozoic, Shawan Sag, Junggar Basin

CLC Number:

TE122

Li Erting, Jin Jun, Liao Jiande, Zhou Bo, Ma Wanyun, Wang Haijing. Study on Geochemical Characteristics and Genesis of Upper Paleozoic Natural Gas in the Perimeter of Shawan Sag, Junggar Basin[J]. Special Oil & Gas Reservoirs, 2022, 29(1): 15-22.

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