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Prediction method and application of caprock faulted-contact thickness lower limit for oil-gas sealing in fault zone
FU Guang, WANG Haoran, HU Xinlei
(College of Earth Sciences, Northeast Petroleum University, Daqing 163318, China)
Abstract:
Under the condition that caprock was not completely disconnected by fault in oil-gas bearing basins, a prediction method of caprock faulted-contact thickness lower limit for oil-gas sealing was established by comparing the sealing ability of fault rock and underlying reservoir rock.The method was applied to the No.1 structure of Nanpu sag, where a prediction on the lower limit of the Ng3 volcanic caprock faulted-contact thickness for sealing the oil-gas in underlying Ed1 was made. The results indicate that the caprock faulted-contact thickness required by oil-gas sealing at fault f1, f2, f3 and f4 are all less than the actual faulted-contact thickness of Ng3 volcanic caprock, thus oil-gas are all sealed in the underlying Ed1reservoir, which is consistent with the current oil-gas distribution in the Ed1. This method is thus applicable to study the caprock faulted-contact thickness lower limit required by oil-gas sealing.
Key words:  caprock  faulted-contact thickness  prediction method  No.1 structure of Nanpu  Ng3  volcanic caprock