珠江口盆地深水扇识别和油气成藏关键要素  

THE IDENTIFICATION OF THE BAIYUN DEEP-WATER FAN AND THE KEY FACTORS OF PETROLEUM ACCUMULATION IN PEARL RIVER MOUTH BASIN

作　　者：王存武[1] 陈红汉[1] 陈长民[2] 庞雄[2] 施和生[2] 

机构地区：[1]中国地质大学资源学院石油系,湖北武汉430074 [2]中国海洋石油有限公司深圳分公司,518067

出　　处：《西南石油大学学报（自然科学版）》2007年第3期12-16,共5页Journal of Southwest Petroleum University(Science & Technology Edition)

基　　金：国家自然科学基金重点项目(40238060);国家自然科学基金面上项目(40372068)。

摘　　要：近年来在层序地层学理论的指导下,在珠江口盆地白云凹陷的地震剖面上识别出各种层序界面,并进一步识别出大量深水扇沉积体,这些深水扇体由众多的盆底扇、斜坡扇、低位楔和下切水道构成。盆底扇和斜坡扇多期叠加,平面上成朵叶状,并与下切水道相连。综合分析白云深水扇的成藏条件,得出控制深水扇成藏的关键要素有两点(1)由断层、不整合面、横向连通的砂体以及流体底辟带组成的发达的输导格架,特别是能与深水扇相连的断层与流体底辟带,是深水扇油气成藏的关键所在;(2)油气运移的动力,盆地模拟结果表明,白云凹陷曾经历了三个地层压力演化旋回,超压的累积和释放对深部烃源岩的排烃并向深水扇体中运移起到了重要作用。The deep-water fan systems contain abundant petroleum and it becomes hot point field in petroleum explorations. Based on the sequence stratigraphy theory, a great variety of the sequence interfaces are identified, furthermore, great deals of deep-water fans are discovered. They are composed of basin floor fans, slope fans, lowstand wedges and downcut channels existing on the Baiyun Sag of the Pearl River Mouth Basin. The basin floor fans and the slope fans developed during several periods overlap each other in vertical, distribute lobately and horizontally, and connecte with downcut channels. On the basis of investigation, the main accumulation controlling factors of the Baiyun Deep-water Fan include: (1) The conducting frameworks, which are composed of faults, continue distribution sandstones, unconformable surface and diapiric zone, connecte the source rock and the deep-water fans and are the key factors of petroleum accumulation; (2) The drive power of oil and gas migration. Based on the basin modeling, there are three circles of strata pressure during the basin evolution. The accumulation and release of overpressure are important for the hydrocarbon expelling from source rock to deep water fans.

关 键 词：珠江口盆地 层序地层学 白云深水扇 成藏条件 主控因素 

分 类 号：P618.13[天文地球—矿床学]