Research method and application of source-fault-cap coupling oil and gas migration to overlying reservoir distribution
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Based on the study of the migration mechanism and form distribution of the source-fault-cap coupling oil and gas to the overlying reservoir, the source-fault coupling oil and gas migration parts of different types of sources are determined by using the oil and gas supply parts of different types of sources and the fracture migration parts;Using the relative thickness of ancient fault of mudstone caprock, the distribution position of fault-cap coupling oil and gas migration form is determined. The superposition of the two has established a set of research methods for the distribution of source-fault-cap coupling oil and gas migration to the overlying reservoir. It is used to study the distribution of oil and gas migration from the source rock of the third member of the Shahejie Formation (Es 3 ), the Nandagang fault and the mudstone caprock of the middle sub-member of the first member of Shahejie Formation(E s1 z ) to the third member of the Dongying Formation(Ed 2 ) in the Qikou Sag of the Bohai Bay Basin. The results show that there are four types of oil and gas migration from the source rock of Es 3 , the Nandagang fault and the mudstone caprock of E s1 z to Ed 2 . The slow migration form of oil and gas, both inside and outside the source, to Ed 2 , is distributed exclusively at observation points 14–17. By contrast, the rapid migration form of oil and gas, outside the source, to Ed 2 , is primarily distributed at observation points 4–6, 7–8 and 9–11. The slow migration form of oil and gas outside the source to Ed 2 is primarily distributed at observation points 2 and 4. The slow migration form of oil and gas inside the source to the Ed 2 is predominantly distributed at observation point 17. The observation points 2, 4–6, 7–8, 9–11 and 14–17 appear to be particularly conducive to the accumulation of oil and gas, both inside and outside the source of the underlying Es 3 in Ed 2 . This observation is consistent with the distribution of oil and gas in Ed 2 , which is primarily concentrated at observation points 2–3, 8, 11–12, and 17–18, and is constrained by the Nandagang fault. It shows that this method is feasible to study the distribution of source-fault-cap coupling oil and gas migration to overlying reservoirs.
