Organization
College of Geosciences, Yangtze University, Wuhan 430100, China
Wuxi Research Institute of Petroleum Geology, Petroleum Exploration and Production Research Institute, SINOPEC, Wuxi 214126, China
Tianjin Branch of CNOOC Ltd., Tianjin 300459, China
Abstract
The tectonics is complex and the fault is developed in Laizhou Bay Sag. The fault sealing plays an important role in controlling the migration and accumulation of oil and gas resources. Firstly, this paper evaluates fault sealing qualitatively based on the fault type, the relationship with stratum dip, fault dip, fault displacement and depth of faults. Then, the fault sealing is evaluated quantitatively with conventional methods according to the two side lithology configuration, clay smearing and stress. Finally, the fault sealing is evaluated by fuzzy comprehensive judgment. The results show that the fault sealing with smaller dip is superior to the fault with bigger dip, the fault sealing in salt anticline is superior to other faults, and the coaxial fault sealing is common or poor, while the reverse fault sealing is good. The result of quantitative analysis with conventional methods is consistent with fuzzy comprehensive judgment in the evaluation of fault sealing, which matches the existing drilling results well.
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