Original scientific paper

https://doi.org/10.17559/TV-20240610001764

Distribution Position Prediction Method of Fault-Caprock Oil and Gas Migration and Accumulation Configuration Pattern

Xu Han ; School of Earth Sciences, Northeast Petroleum University, Daqing City, Heilongjiang Province, 163318, China
Guang Fu ; School of Earth Sciences, Northeast Petroleum University, Daqing City, Heilongjiang Province, 163318, China *

* Corresponding author.

Abstract

This study aims to investigate the patterns of oil and gas dispersal within the fault-caprock configurations in an oil-gas-rich basin. Using the results of the mechanism and spatial distribution research of fault-caprock oil and gas migration and accumulation configuration patterns, a predictive method has been developed for determining the distribution of fault-caprock fluid migration and accumulation configuration patterns. This method involves superpositing source rock faults, mudstone and fault rock seals within fault-caprock configurations. The application of this method is demonstrated through the prediction of the distribution of fault-caprock fluid migration and accumulation configuration patterns within the lower sub-member of the 1st member of the Shahejie Formation (E3s1L) in the Qikou Sag, Bohai Bay Basin. The Dazhangtuo fault and regional mudstone caprocks within the middle sub-member of the 1st member of the Shahejie Formation (E3s1M) are involved. The results of this study demonstrate that the fault-caprock sealing of petroleum and natural gas by mudstone and fault-related lithological seals in the configuration pattern of the Dazhangtuo Fault and regional mudstone caprocks in E3s1M is primarily distributed in the western part of the basin, with localized occurrences in the eastern areas. This configuration pattern is optimal for the accumulation of petroleum and natural gas reservoirs in the E3s1L. The fault-caprock configuration pattern that seals oil and gas by mudstone is primarily located in the western portion, making it relatively favorable for the accumulation of oil and gas reservoirs in the E3s1L. However, the fault-caprock configuration pattern of sealing oil and gas by fault-related lithological is constrained to two specific localized areas in the eastern portion, which is not conducive to the occurrence of oil-gas convergence in the E3s1L. The location of detected oil and gas within the E3s1L at the present Dazhangtuo fault is consistent with the predicted pattern of oil and gas accumulation and their distribution locations using this method. This demonstrates the viability of forecasting using this approach to predict the location of fault-caprock migration and the accumulation oil and gas configuration pattern.

Keywords

caprocks; configuration pattern; distribution location; fault; oil-gas migration; prediction method

Hrčak ID:

321950

URI

https://hrcak.srce.hr/321950

Publication date:

31.10.2024.

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