Geochemical characteristics and genesis of Paleozoic natural gas in the southern Ordos Basin
Received date: 2023-10-10
Revised date: 2023-11-01
Online published: 2023-11-24
Supported by
The Joint Fund of National Natural Science Foundation(U224420046)
the SINOPEC Technology Department Project(P22071)
The geochemical characteristics of Paleozoic natural gas in the southern part of the Ordos Basin are significantly different from those in the northern part. In addition to the increase in dryness coefficient caused by the increase in organic matter maturity of the source rocks and the heavier carbon isotope composition of methane, the CO2 gas content in the natural gas in the upper Paleozoic in the southern part of the basin is higher, and there is a common phenomenon of methane and ethane carbon isotope composition inversion. This article takes gas geochemistry as the main research method, and based on a systematic comparison of the north-south differences of natural gas in the Paleozoic Basin, discusses the origin and source of natural gas. The natural gas of the Upper Paleozoic in the southern part of the basin is mainly composed of high over mature coal type gas, and some sample gas geochemical indicators in some areas reflect the characteristics of lower paleomarine hydrocarbon sources. The overall inversion of methane and ethane carbon isotope composition in the Upper Paleozoic natural gas in the southern part of the basin is related to the mixing of different types of natural gas. The varying degrees of mixing of Lower Paleozoic oil type gas with relatively high ethane content and lighter ethane carbon isotope composition are the main reasons for the inversion of carbon isotope composition of Upper Paleozoic natural gas in the southern part of the basin. The geochemical indicators of natural gas in the Lower Paleozoic in the southern part of the basin reflect typical marine hydrocarbon source characteristics, and the possibility of a small amount of Upper Paleozoic coal type gas mixing cannot be ruled out.
Tao ZHANG , Xiaofeng WANG , Xiaohui JIN , Qingqiang MENG , Yiran WANG , Xiaoyan CHEN , Wen ZHANG , Juan ZHANG . Geochemical characteristics and genesis of Paleozoic natural gas in the southern Ordos Basin[J]. Natural Gas Geoscience, 2024 , 35(9) : 1616 -1625 . DOI: 10.11764/j.issn.1672-1926.2023.11.005
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