乐山—龙女寺隆起区下古生界油气勘探的有利地区和条件

FAVOURABLE REGION AND CONDITIONS FOR PETROLEUM EXPLORATION OF LOWER PALAEOZOIC IN LESHAN-LONGNUSI PALAEO-UPLIFT AREA

地质、物探、钻井资料的综合研究表明,乐山—龙女寺隆起是受加里东期历次构造运动影响和边界断裂控制的侵蚀型古隆起.该区下古生界具良好的生油气条件,尤其隆起东南缘,由于频繁的海水进退、多次沉积间断及断裂活动,可能找到较好的储集岩类和各种岩性圈闭、微不整合圈闭及其它隐蔽圈闭.它们是下古生界油气勘探的有利地区。

With synthetic studies of informations of geology, geophysics and dri-lling, the author thought that Leshan-Longnusi uplift was influenced by several tectonic movements during Caledonian period and was controlled by border faults. It experienced erosion at the end of Guangxi movement, thus became fixed in the form of sedimentary-erosional palaeo-uplift. There are favourable conditions for oil and gas generation in lower palaeozoic of the area, and due to frequent transgressions and regressions, numerical sedimenting gaps and faulting activities, good reservoir rocks and various lithological traps, slight unconformitive traps and burial traps would be found on the southeast of the uplift, which confirmed the area is promissing for petroleum exploration.