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下刚果盆地是西非被动大陆边缘系列盆地之一,为一大陆裂谷与被动陆缘盆地形成的叠合盆地.盆地储层为渐新统和中新统的浊积砂体.由于早白垩世末期盆地发育大规模蒸发岩层序,上覆沉积负载与非洲板块西倾使得盐岩塑性流动,造成盐上圈闭形成都与盐活动相关.S区块处于盐岩过渡构造带,由于储层分布受沉积相与盐构造的双重控制,难以准确地预测储层,针对上述难点,此文提出了如下的技术思路及流程,即首先利用地震解释得到目的层构造形态,其次综合利用地震属性和地震分频技术得到砂体分布图及沉积相图,并分析构造和砂体的配置关系,寻找有利圈闭,最后利用avo直接烃检测技术对含油气性进行预测.结果显示预测的有利区与已知油田有着很好的对应,且识别的3个未钻圈闭勘探前景良好.应用效果验证了本技术方法对盐相关圈闭具有很好的适用性,可在同类型圈闭中进一步应用.
The Lower Congo Basin is one of the passive continental margin basins in West Africa and is a superimposed basin formed by a continental rift and a passive margin basin.The reservoir is a turbidite sand body of Oligocene and Miocene.As a result of the Early Cretaceous Large-scale evaporite sequences are developed in the late stage of basin, and the overlying sedimentary load and western tilt of Africa plate cause the plastic flow of salt rock, resulting in the formation of salt traps related to salt activity, and the block S is in salt rock transitional zone. Due to reservoir distribution Due to the dual control of sedimentary facies and salt structure, it is difficult to accurately predict the reservoir. In view of the above difficulties, this paper proposes the following technical ideas and processes: firstly, the structural formation of the target layer is obtained by means of seismic interpretation; second, the comprehensive utilization of seismic attributes and earthquakes Frequency distribution technique to get the distribution of sand body and sedimentary facies chart, and analyze the configuration relationship between structure and sand body to find favorable traps, and finally use the direct hydrocarbon detection technique of avo to predict the hydrocarbon-bearing property.The results show that the predicted favorable area is The well-known oilfield has a good correspondence, and the identified 3 un-drilled traps have a good prospect of prospecting.The application results show that this method has good applicability for salt-related traps, Type traps further applications.