大庆长垣油田开发地震沉积学研究

Seismic sedimentology for development of Daqing Changyuan Oilfield

随着地震沉积学研究和应用的不断深入,大庆长垣油田密井网开发区陆相砂泥薄互层储层预测出现地层切片优选效率低、井震信息匹配分析难度大、地层切片与储层厚度缺乏量化的对应关系等问题。为此,在波阻抗特征分析、基于地质目标的保幅地震数据处理基础上,研究了地层切片自动优选、地震属性平面可信度分析、井—震结合厚度定量预测等方法,构成了大庆长垣油田开发地震沉积学技术基本框架,并研发了井震结合储层预测软件,提高了长垣油田开发地震沉积学储层预测精度和效率。实际应用表明,在密井网开发区仍然存在很多井数据无法确定的砂体变化,在井间可能发育宽度小于半个井间距的窄河道,开发地震沉积学对这些地质现象的预测与分析对于油田开发具有重要意义。

As the research and application of seismic sedimentology continue,a number of problems are encountered during the prediction of thinly interbedded continental sand-mud reservoirs in the development area with a dense well pattern in Daqing Changyuan Oilfield.Such problems include low efficiency of stratal slice optimization,difficult matching analysis of logging and seismic data information,and lack of quantified correlation of stratal slices with reservoir thickness.Therefore,methods such as automatic stratal slice optimization,plane reliability analysis of seismic attributes,and quantitative thickness prediction integrating logging and seismic data are studied after the analysis of wave impedance characteristics and amplitude-preserved seismic data processing based on geological targets.As a result,the basic framework of seismic sedimentology-based technology for Daqing Changyuan Oilfield is established,and reservoir prediction software integrating logging and seismic data is developed to improve the accuracy and efficiency of seismic sedimentology-based reservoir prediction for the development of the Changyuan Oilfield.Practical applications show that the development area with a dense well pattern is still subject to sand body changes that cannot be controlled with logging data and that narrow channels with a width less than half the well spacing are likely to develop between wells.The prediction and analysis of such geological phenomena with seismic sedimentology are of great significance for oilfield development.