A three-time-node identification method for vertical fault sealing in mudstone caprock and its application: Case study of the Huhenuoren Fault in the Beier Sag of Hailar Basin
Received date: 2025-05-16
Revised date: 2025-08-13
Online published: 2025-09-22
Supported by
The National Natural Science Foundation of China(42072157)
In order to investigate the hydrocarbon distribution characteristics at the Huhenuoren Fault in the Beier Sag of Hailar Basin, a three-time-node-active period, cessation of faulting, and the present time-is established to characterize the vertical sealing behavior of faults in mudstone caps. Specifically: during the active period, the longitudinal sealing capability of the fault within the mudstone caprock was determined by the paleo-mudstone content of the fault infill material and the maximum required thickness for vertical connection within the mudstone caprock; during the cessation of activity, the longitudinal sealing capability of the fault within the mudstone caprock was determined by the paleo-mudstone content of the fault infill material and the minimum required mudstone content for longitudinal sealing; and after the current cessation of activity, the longitudinal sealing capability of the fault within the mudstone caprock was determined by the mudstone content of the fault rock and the minimum required mudstone content for longitudinal sealing. The longitudinal sealing capacity of the Lower Cretaceous about the lower first member of Damoguaihe Formation (Lower First Member) within the Huhenuoren fault zone was evaluated at three distinct time points, the results show that at study sites 1-3, 5, 7-8, and 12-15, the Huhenuoren Fault exhibits vertical sealing within the Lower Member I mudstone caprock at all three time intervals. Conversely, at sites 4, 6, and 9-11, the fault does not provide vertical sealing at any of the time intervals;Thus, sites 1-3, 5, 7-8, and 12-15 are favorable locations for hydrocarbon accumulation and preservation in the Nantun Formation second section (southern second section) of the fault. This is the fundamental reason why hydrocarbons have been observed at sites 7-8 and 12-15 in the southern second section of the Huhenuoren Fault, whereas sites 1-3 and 5, though vertically sealed, have not accumulated hydrocarbons due to their position in structural lows with insufficient hydrocarbon supply.
Guang FU , Haoxuan XU . A three-time-node identification method for vertical fault sealing in mudstone caprock and its application: Case study of the Huhenuoren Fault in the Beier Sag of Hailar Basin[J]. Natural Gas Geoscience, 2025 , 36(12) : 2217 -2226 . DOI: 10.11764/j.issn.1672-1926.2025.07.007
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