珠江口盆地珠一坳陷浅层油气勘探实践及潜力探讨——以番禺4洼为例

PRACTICE OF SHALLOW OIL AND GAS EXPLORATION IN ZHUⅠDEPRESSION OF THE PEARL RIVER MOUTH BASIN:A CASE FROM PANYU4 SAG

珠江口盆地珠一坳陷传统上以珠江组、珠海组为主要勘探目的层,并已获重大储量发现。近年来,番禺4洼率先在浅层(韩江组、粤海组)发现有规模性的油藏,累计发现石油地质储量约2 051万m3。浅层以边水油藏为主,且具有油藏数量多、储量规模大、充满度高和储层物性好等优点。浅层成藏受烃源岩供烃能力、古珠江三角洲前缘沉积体系、源—盖倾向、晚期断裂和断层侧向封堵能力等联合控制。研究认为,番禺4洼、惠州凹陷中西部及恩平凹陷均有浅层成藏条件和勘探潜力。

The Zhujiang and Zhuhai Formations are usually regarded as the main traditional exploration targets in the Zhu I Depression, Pearl River Mouth Basin. Recently, under the guidance of the idea of ＂compound reservoir＂ and ＂stereoscopic exploration＂, more studies have been devoted to the new areas and formations. A large amount of commercial reservoirs have been discovered in the shallow strata （Hanjiang and Yuehai Formations） in the Panyu 4 Sag. The total reserves are about 2051 104m3. Reservoir quantities, reserves, saturation and reservoir physical properties of the shallow strata are better than those of the underlying strata. The shallow reservoirs are controlled by petroleum sources, sedimentary systems, dip direction of source rocks and regional cap rocks, later-stage faults and sealing capabilities. According to the studies of reservoir features as well as oil accumulation in shallow strata, it is believed that the Panyu 4 Sag, the middle and western Huizhou Depression and Enping Depression have great potential for oil exploration.