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准噶尔盆地车排子地区排2井在新近系沙湾组获得高产工业油流,排2井油藏在地震剖面上具有油亮点特征。利用正演检测确定了油亮点的地震反射特征,并通过分析影响油层及其围岩波阻抗变化的因素,明确了油亮点的形成机理。利用地震振幅属性描述技术、分频检测技术和叠前AVO属性技术对油亮点进行识别,并结合勘探实践总结了3种常见的假亮点。
Pai-2 well in Chepaizi area of Junggar Basin obtained high-yield industrial oil flow in Neogene Shawan Formation, and Pao-2 well has oil bright spot in seismic section. The seismic reflection characteristics of the bright spots of oil are determined by forward inspection, and the formation mechanism of oil bright spots is clarified by analyzing the factors that affect the variation of the impedance of the oil layer and its surrounding rock. This paper uses seismic amplitude attribute description technique, crossover detection technique and prestack AVO attribute technique to identify oil bright spots, and summarizes three kinds of common false bright spots in combination with exploration practice.