相控多因素综合分析的速度预测及其在乌石凹陷的应用  

Velocity prediction under the control of sedimentary microfacies and its application in Wushi sag

作　　者：胡林 

机构地区：[1]中海石油(中国)有限公司湛江分公司,广东湛江524057

出　　处：《油气藏评价与开发》2016年第5期1-4,共4页Petroleum Reservoir Evaluation and Development

基　　金：国家科技重大专项"南海西部海域已证实的富生烃凹陷再评价及新领域勘探方向"(2011ZX05023-001-007)

摘　　要：统计结果表明,乌石凹陷流沙港组二段由于特殊的沉积环境出现速度反转,流二段地层砂地比在本区主要目的层埋深区间内与地层速度基本呈线性相关关系,而乌石凹陷流二段断裂活动十分活跃,对沉积的控制作用强,在流二段沉积之后断裂活动又使其进一步复杂化,导致地层砂地比横向、纵向变化剧烈,使得本区主要成藏层系流二段及下伏流三段地层深度预测困难。首次提出了从沉积微相预测入手,与地球物理方法相结合,估算地层砂地比的技术思路,结合常规的变速剥层、井校正速度体等方法在本区进行地层速度预测,取得了良好的应用效果。The statistics show that, due to special sedimentary environment, the velocity of L-2 member in Wushi sag is reversal, and there is a linear correlation between ratio of sand body and stratum and formation velocity, however, the strong movement of faults of L-2 member controls the sedimentation, and after the sedimentation, the movement of faults complicates the sedimentation, which causes tremendous changes of ratio of sand body and stratum in horizontal and vertical direction, making it difficult to predict the depth of the L-2 member and underlying L-3 stratum. This paper firstly proposed sedimentary microfacies prediction method and geophysical method to estimate the ratio of sand body and stratum and conducted formation velocity prediction in this area through conventional variable stripping method and velocity volume by well correction method, and it achieved good effects.

关 键 词：乌石凹陷 速度预测 沉积微相 砂地比 

分 类 号：TE122[石油与天然气工程—油气勘探]