边际含油构造潜力评价技术应用与探讨

Application and discussion on marginal oil-bearing structure potential evaluation technique

在南海东部的边际含油构造潜力评价中,主要遇到三个研究难点:地震速度横向变化问题、深部地震资料品质问题以及储层砂体横向分布问题。本文针对这三个研究难点,以不同的油田为例,采取不同的研究对策和技术,开展针对性的研究与应用。对于地震速度横向变化问题,采用多种速度方法进行构造敏感性研究,了解影响速度变化的各种因素,掌握速度空间变化的趋势和规律,建立能够反映实际地质情况的时—深转换关系;对于深部地震资料品质问题,采取多种地球物理方法进行综合技术研究,运用叠后、叠前地震资料构造研究与油气烃类检测相结合并相互验证;对于储层砂体横向分布问题,采用地震沉积学分析方法,将层序地层学的概念引入到地震资料解释中,以地质模式为指导,采用地震反演、地层切片和地震属性提取等手段对油田进行解剖性研究,预测储层和砂体展布特征。

In the potential evaluation for the marginal oil-bearing structure in the South China Sea,3 difficulties in research were encouraged,they are the lateral change of the seismic velocity,the seismic data quality for the deep target and the lateral distribution for the sandbody reservoir.Regarding the 3 difficulties the different strategies and techniques were used,the corresponding research and application were conducted for different oilfields.For the lateral change of the seismic velocity,several velocity methods were used to conduct structure sensitivity research,every factor which affects velocity change was studied,the changing trend and law for the velocity space were understood,the depth-time relation which reflects the real geological conditions was established,for the poor seismic data quality of the deep target,several geophysical methods were used to conduct integrated technological research,post-stack and pre-stack seismic data structure research and oil&gas hydrocarbon detection were combined and validated with each other,for the lateral distribution of the sandbody reservoir seismic sedimentology analysis method was used and the concept of the sequence stratigraphy was brought into seismic data interpretation,guided by geological mode,the seismic inversion,stratigraphic slicing and seismic attribute extraction were utilized to conduct detailed studies and to predict reservoir and the characteristics of the sandbody distribution in the oilfield.