Tancheng-Lujiang Fault System: Its Characters and Control on Oil-Gas Distribution in Eastern China

摘要

Tancheng-Lujiang fault system is one of the largest strike-slip fault systems in eastern Asia. It extends southward to Beibuwan Bay to the west of Hainan Island and northward through Lujiang of Anhui Province, Tancheng of Shandong Province and Luobei of Heilongjiang Province in China to the territory of Russia. Its formation is related to the subduction of Kula-Pacific plate to the Asian continent. It is oriented approximately parallel to the eastern edge of Asia. It is dominated by the sinistral translation from Jurassic to Eocene and then by dextrose strike-slip. It has the following characters: (1)clear linear character; (2)sharp dip angle, usually changing between normal and reverse faults; (3)showing braided structure on the plan and flower structure in section; (4)alternated by uplifts and sags along the fault be (5)many stages of the eruptions of alkaline to calc-alkaline basalt magma along the fault be and (6) frequent activities of earthquakes along the fault belt. Its control over the oil-gas distribution is shown by the following facts: (1) the formation of many oil-bearing fault depressions; (2) the increase of the basin area it has passed through, thus increasing the basin's subsiding quantity and the oil reservoirs; and (3)the formation of many kinds of oil-gas trap structures.