Through the fracture analysis and tectonic evolution, and combined with hydrocarbon geochemical indicators, comprehensive research conclude that the integral migration characteristics of Hudson oil and gas is “multi-stage migration and late stage accumulation”, involving vertical and horizontal. During terminal Hercynian and Himalayan period, the successional growth of main faults derived revival faults and sub faults cutting through the bottom of Carboniferous system. Underneath the Carboniferous gypsum stratum, there are basement-involved faults cutting through the Cambrian-Ordovician oil source. Late Caledonian and Late Hercynian period, the oil and gas coming from the Cambrian-Ordovician migrated vertically along Yangwu 2 well field. Then Hudson Carboniferous inclined southward wholly, without effective traps developed, two stages of oil and gas did not accumulate effectively. Owing to the orogenic movement of the late Himalayan period, the Carboniferous strata emerged southward to northward tectonic reverse, forming effective traps. In addition, thanks to the revival of the Paleozoic deep oil source faults, the oil and gas gathered in the Ordovician reservoir migrated vertically to the Carboniferous Donghe sandstone along the revival faults. Under the northward slope background, the oil and gas laterally migrated from north to south with a short distance and accumulated in Carboniferous traps, forming the nowadays Hudson reservoir.
Zhang Wen Wang Yueran Wu Shaojun Zhou Peng Zhang Wei Xu Qiuyun Zhang Xueqi Wang Tengyu. Characteristics of hydrocarbon migration of Donghe sandstone reservoir in Hadexun oilfield[J]. Chinese Journal of Geology, 2018, 53(1): 105-114.