苏北盆地印支面地震属性方法研究

Study of seismic attributes of Indosinian unconformity in Subei Basin

苏北盆地中、上古生界具有很好的烃源岩条件。由于受到多期构造运动的改造和地震资料的限制,致使中、上古生界地层的构造特征、分布和保存的多少历来存有争议。为了进一步了解印支面下伏中、上古生界地层在全区的分布状况,应用正反演方法进行尝试。应用一维正演模型和SeisClass模块沿印支面进行地震属性的提取、相关性分析和聚类反演,从有井控制区反演出无井控制区的印支面上下地层接触关系。通过对HQ地区地震属性的剖析,在该区选取均方根振幅和能量半衰时进行聚类反演得到印支面上下地层接触关系平面分布。此方法对于推测全区的印支面下伏残存中、上古生界地层具有很好的指导意义。

In Subei Basin, the hydrocarbon source rocks of Mesozoic and Upper Paleozoic strata are qualified. However, their structure, distribution and preservation have been controversial for years because the strata suffered from multi - period tectonic movement and the seismic data is limited. In this paper, the forward inversion technology is applied to study the distribution of Mesozoic and Upper Paleozoic strata under Indosinian unconformity. The seismic attributes of Indosinian unconformity were extracted, and the relevant analysis and cluster inversion were carried out by one - dimensional forward model and SeisClass module to obtain the stratigraphic contact relationship of the upper and lower Indosinian unconformity. Analysis based on seismic attributes of HQ area, RMS amplitude and energy half decay time were selected to obtain the horizontal distribution of stratigraphic contact relationship of the upper and lower Indosinian unconformity by the cluster inversion. This method is significant to the prediction of the remaining Mesozoic and Upper Paleozoic under Indosinian unconformity in the whole area.