Petroleum migration history in middle-upper Proterozoic system in Liaoxi-Jibei depression

摘要

Using organic fluid inclusion analyzing method, the maturity and the migration history of oil and gas distributed in Wumishan, Tieling and Xiamaling formation in middle-upper proterozoic system in Liaoxi-Jibei depression are especially discussed. According to the tectonic evolution history, the charge times of oil and gas are established preliminary. There are many cracks and pores in middle-upper proterozoic reservoirs rocks, most of them are filled by calcite or bitumen. Observation by microscope, all kinds of organic inclusions can be seen in different diagenesis mineral. According to the occurrence and the optical character, these organic inclusions are assured formed in different geological times and which also shows the reservoir experienced multistage oil and gas charging.