东沙隆起台地生物礁、滩油藏成藏条件及勘探思路探讨

东沙隆起碳酸盐岩台地生物礁、滩油藏的勘探,是珠江口盆地(东部)重要的勘探领域之一。勘探实践证实,惠州凹陷烃源岩、断至凹陷深部的断裂、珠海组优质砂岩、明确的构造脊、良好的生物礁礁滩储层和上覆的厚层海相泥岩,共同构成了东沙隆起地区油气长距离运移成藏的特殊地质条件。随着近年来高精度3D地震资料的进一步覆盖和地质认识的逐步深入,综合利用各种地质、地球物理新方法和新技术,确定生物礁、滩油藏勘探的有利区带,建立碳酸盐岩台地及生物礁沉积、演化模式,确定有利的生物礁、滩圈闭,是该地区生物礁、滩油藏勘探的重要方向。

Forming conditions and exploration direction of reef oil-gas pool in carbonate platform of Dongsha Massif

The reef oil-gas pool in the carbonate platform of Dongsha Massif is one of the most important exploration directions.Exploration practice indicates that this area has very good forming conditions,including the source rock of Huizhou sag,the fault system to the deep layer of sag,the transporting layer of Zhuhai formation sand,clear structure ridge,better reef reservoir,and ideal regional cap rock of the thick overlying marine shale.With new coverage of high accuracy 3D seismic data and new geological interpretations of the recent years,we propose to exploit updated geological and geophysical techniques to confirm the favorable area of reef oil pool,to found a correct sedimentation evaluation mode of the reef and carbonate platform,and to find more hidden reef and bank carbonate traps over Dongsha Massif area.