综合地震属性分析在JZS油气田太古界变质岩潜山储层预测中的应用

裂缝性变质岩储层的研究理论、方法与孔隙型砂岩储层有明显不同,主要在于变质岩大部分原生孔隙为次生的构造裂缝所代替,此类裂缝不仅是储集空间,也是油气的渗流通道。由于潜山变质岩储层埋藏深、构造复杂,地震资料品质差,给储层解释和预测带来较大的难度。本文在已有技术的基础上,总结出一套有效的裂缝性变质岩潜山储层预测技术,主要包括:精细沿层方差体切片技术、基于叠前地震数据体的频谱成像分析技术、构造应力场分析技术和吸收衰减属性分析技术等,其中以方差体切片使用效果最明显。利用此套技术对JZS油气田太古界潜山储层中裂缝性储集层发育情况和含油气性进行了预测。预测结果与钻井结果吻合很好,表明该套技术具有较好的应用前景。

Application of comprehensive seismic attributes analysis in prediction of Archaean metamorphic rock buried-hill reservoir in JZS oil/gas field

There is significant difference in studying theory and methods between the fractural metamorphic rock reservoir and porous sandstone reservoir.Mainly is that a majority of primary pores in metamorphic rock are replaced by secondary structural fractures that are not only the accumulation space, but also the channel of oil/gas seepage flow~ 1,2] . Because of deep buried depth of metamorphic rock buried hill reservoir, complex structure and poor seismic data quality, it will bring a larger difficulty to reservoir interpretation and prediction. On the basis of available techniques, the paper summarized a set of effective prediction techniques of fractural metamorphic rock buried hill reservoir, mainly included: fine layer-along variance volume slice, prestack seismic data volume-based spectrum imaging analysis, tectonic stress field analysis and attenuation by absorption attribute analysis etc., among which the effect of variance volume slice is more distinctive. Using this set of techniques to predict the development and oil/gas-bearing character of fractural reservoir of Archaean buried hill reservoir in JZS oil/gas field. The predicted results well coincided with the drilling results, which showed that the techniques have good application prospect.