论文部分内容阅读
近年来,准噶尔盆地玛湖凹陷北斜坡区三叠系百口泉组油气勘探获得重要突破,储层为典型的低孔低渗砂砾岩储层,局部发育“甜点”储层,由于“甜点”与非“甜点”地球物理响应差异小,导致地震预测难度大。为此,在储层成因分析的基础上,采用“相带—河道—物性—裂缝”逐级控制的新思路,预测“甜点”储层的分布。首先,利用高分辨率地震层序地层解释技术得到等时的地质界面,恢复沉积期古地貌,精细刻画相带的边界;然后,采用基于模型正演的地震属性定量分析技术,预测主河道砂体的展布;其次,在叠前CRP道集优化处理的基础上,利用射线弹性阻抗反演技术,预测储层物性的分布;最后,采用高分辨率相干加强技术预测裂缝的分布。经勘探实践证实,这种逐级控制的新思路和新方法,降低了“甜点”储层预测的多解性,值得在类似的地区推广应用。
In recent years, the Triassic Baikouquan Formation in the northern slope of the Mahu Sag of the Junggar Basin has made an important breakthrough. The reservoir is a typical low-porosity and low-permeability grit conglomerate reservoir and the locally developed “sweet spot” reservoir. The difference between the “sweet” and non “sweet ” geophysical responses is small, making the prediction of earthquakes difficult. Therefore, on the basis of reservoir genetic analysis, a new idea of stepwise control of “facies belt - channel - physical property - fracture” is adopted to predict the distribution of “sweet spot” reservoir. First of all, the isochronous geologic interface is obtained by using the high-resolution seismic sequence stratigraphic interpretation technique to restore the paleogeomorphology of the sedimentary period and finely depict the boundary of the facies belt. Secondly, based on the qualitative analysis of the seismic attributes of the model, the prediction of the main channel sand Secondly, based on the optimization of prestack CRP gathers, the distribution of reservoir physical properties is predicted by using the ray elastic impedance inversion technique. Finally, the distribution of fractures is predicted by high resolution coherence enhancement technique. After exploration practice, this new idea and new method of step-by-step control have reduced the multi-solution of “sweet ” reservoir prediction, which is worth popularizing and applying in similar areas.