桂中拗陷下泥盆统郁江阶—下石炭统生油运移期与构造配置关系初探

桂中拗陷是在加里东褶皱基底上发育起来的沉积拗陷。上古生界至中三叠统,海相沉积厚逾万米。其中下泥盆统郁江阶至下石炭统,最大沉积厚度可达5500多米。地表油气显示类型多、分布广,为本区找油(气)主要目的层。然而,后期改造强烈,对油气的生成、运移、聚集和破坏有很大的影响。 

ON RELATIONSHIP BETWEEN THE PERIOD OF OIL GENERATION—MIGRATION AND THE STRUCTURAL SETTINGS FROM THE YUJIANG STAGE OF LOWER DEVONIAN TO LOWER CARBONIFEROUS IN THE CENTRAL GUANGXI DEPRESSION

According to the informations of subsurface geothermal data,the burial history of source rocks and the main characteristics of the tectonic stages,this paper discusses the relationship between the main period of oil generation-migration and structural settings from the Yujiang Stage of Lower Devonian to Lower Carboniferous in the Central Guangxi Depression.It is believed that the main period of oil generation-migration of the Devonian System came to an end at an earlier time.It is advisable to search for gas rather than oil in structures and other types of traps formed during Dongwu and Indo-China movements.For searching of oil,it is necessary to study structures and other types of traps of pre-Dongwu movement.However,the main period of oil generation-migration of the Lower Carboniferous completed at a later time,oil and gas formed in these source rocks could be trapped in structures and other types of traps of the Indo-China or pre-Indo-China movements,which should be regarded as the principal target for exploration.