Yitong Basin Moliqing fault depression Yi 11 well burial hill oil source research and its significance

摘要

Aimed at the first bite of Yitong basin buried hill industrial oil flow well Yi 11 well oil source is unknown. Of Yitong basin Moliqing fault depression of the source rocks of the abundance, type, maturity evaluation. The results showed that only the dark mudstone of E_2s developed as mature source rocks in Yitong Basin Moliqing Fault Depression. Among them, E_2S_1 was more advantageous to hydrocarbon generation both in organic matter types and maturity. And analysis of saturated hydrocarbon and aromatic hydrocarbon by gchromatography mass spectrometry. Data show that the Yi 11 well crude oil was mature, what showed that the oil should be from E_2s. Light hydrocarbon and monomer hydrocarbon isotope data confirmed this conjecture. The parameters of the further comparison between pristane and phytane it is concluded that the Yi 11 well's oil was from E_2S_1. The reservoir space of Yi 11 well's buried hill structure was formed by weathering and some other effects. The buried hill are contacted with the source bed in Shuangyang Formation by faulting, and accept for lateral hydrocarbon. The oil in Yi 11 well was from E_2S_1, which had the largest hydrocarbon generation ability. It meant the buried hill of Moliqing Fault Depression should have great exploration potential, and also indicated that the widely distributed buried hill in Yitong Basin are worth exploring.