珠江口盆地番禺低隆起—白云凹陷北坡断层与油气成藏关系

Relationship between faults and hydrocarbon accumulation in Panyu low massif and north slope of Baiyun Sag,Pearl River Mouth Basin

综合运用断层分类、断层活动史分析、油藏充注史分析等方法,对珠江口盆地番禺低隆起—白云凹陷北坡地区断层与油气成藏关系进行了研究。该区发育两种类型断层:长期活动断层及晚期断层,这两种断层活动期与油气充注期匹配关系均较好,推断二者在油气充注史中起了相似的作用。勘探实践和各种证据表明,该区断层是油气垂向输导的主要通道,现今的静态的断层封闭作用控制了新近系目的层的油气成藏,而岩性对接情况是该区断层静态封闭性的主要控制因素。根据分析结果,建议该区勘探应加强目的层顶面演化特征研究、落实圈闭和断层封闭性,位于油气运移路径上且断层封闭性有效的圈闭,勘探获得成功的可能性较大。

The relation between faults and hydrocarbon accumulation is researched by the analysis of fault classification, activity history, and petroleum charge history in the Panyu low massif and the north slope of Baiyun sag. Two kinds of faults including long active fault and late active fault exist in the area. The active periods of these two kinds of faults matched the periods of hydrocarbon charge, so they should have acted similarly in hydrocarbon charging. Exploration results and ample evidence show that faults are the main passage for oil and gas migrating vertically and the hydrocarbon accumulation is controlled in Neogene by current static fault sealing in which the main control factor is lithologic juxtaposition. The research about the evolvement of target layers, traps and fault-seal should be strengthened and the traps which are in the path of petroleum migration and have static fault sealing are easier to be explored successfully.