Controlling factors of natural gas carbon isotope distribution and its charging models in the HY area in the central and southern Xihu Sag, East China Sea Basin
Received date: 2024-01-04
Revised date: 2024-03-21
Online published: 2024-04-07
Supported by
The Major National Science and Technology Projects of the 13th Five Year Plan(2016ZX05027-001)
the National Oil and Gas Resource Evolution of the 14th Five Year Plan(QGYQZYPJ2022-3)
the Major Science and Technology Project of CNOOC(KJZX-2023-0101)
HY area is an important natural gas exploration area in the central and southern Xihu Sag of East China Sea Basin, with a relatively low level of exploration. Insufficient understanding of the natural gas reservoir formation mechanism has constrained further exploration expansion. Integrated utilization of laboratory data of natural gas, source rocks, and reservoirs were used to clarify the process of natural gas accumulation. Taking natural gas carbon isotopes as the research object, the controlling factors of its distribution were analyzed and the natural gas charging model was established in the HY area, and the favorable exploration directions were pointed out. The following research results are obtained. First, the natural gas of HY area is coal-type gas, derived from humic-type kerogen. Second, the carbon isotope composition and thermal evolution degree of kerogen in source rocks are the main factors controlling the planar distribution of natural gas carbon isotopes in the HY area. The lateral migration characteristics of natural gas are not significant, showing downward generation and upward storage, vertical migration, and near source charging characteristics. Third, the relationship between the early and late stages of gas charging and the time of reservoir densification is an important reason for the vertical distribution of carbon isotope. The first stage reservoir has not been densified, and the carbon isotope is “light in the upper and heavy in the lower” distribution. In the second stage of deep reservoir densification, the carbon isotope is “upper heavy and lower light” distribution. Fourth, there are two kinds of natural gas charging modes, early and late, in HY area. In conclusion, the intensity of natural gas injection and the effectiveness of traps determine the scale of gas reservoirs in the early charging mode dominated area. Natural gas charging intensity, trap effectiveness and reservoir physical properties determine the scale of gas reservoirs in the late charging mode dominated area.
Key words: Xihu Sag; HY area; Natural gas; Carbon isotope; Charging model
Fei DING , Wei ZOU , Jinshui LIU , Hui DIAO , Wu ZHANG , Hong ZHAO , Zhongkun YU . Controlling factors of natural gas carbon isotope distribution and its charging models in the HY area in the central and southern Xihu Sag, East China Sea Basin[J]. Natural Gas Geoscience, 2024 , 35(11) : 2029 -2039 . DOI: 10.11764/j.issn.1672-1926.2024.03.012
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