渤海南部A油田古近系物源约束地震储层预测

渤海南部海域A油田沙河街组沙三中I油组上段井震标定仅为一个波峰，储层厚度横向变化快且井震匹配性差，提高储层预测精度存在难度。重矿物数据分析表明，油田中-西块沙三中I油组上段物源主要来自西南垦东凸起；东块受东北莱北低凸起物源控制，多物源沉积是井震匹配性差的关键因素。综合前人井震分析结果，优选地震振幅属性，分析油田沙三中I油组上段38口已钻井振幅属性与砂岩含量，物源体系约束下两者满足线性关系；同物源沉积体振幅属性越小，砂岩含量越高，反之亦然。物源体系约束下的地震储层预测，量化了振幅属性与砂岩含量的关系，提高了油田古近系沙三中I油组上段储层预测精度。

Paleogene Source-constrained Seismic Reservoir Predictions in A Oilfield of the Southern Bohai Sea

Seismic reflections from the upper Oil Layer I (within the Middle of the Sha 3 Member in Shahejie Formation) in A Oilfield in the Southern Bohai Sea only returned a single peak, while the reservoir's thickness changed rapidly in the horizontal direction, and the accuracy of well-seismic ties were also very poor in this region. These issues posed difficulties for further improvements in the accuracy of reservoir predictions. The analysis of heavy mineral data indicated that the main source of the upper Oil Layer I in middle-western plates of the oilfield is the southwestern Kendong Uplift. The eastern plate on the other hand, is controlled by sources in the northeastern Laibei Uplift, and multi-source sedimentation is the key factor underlying the low accuracy of well-seismic ties. Based on previous well-seismic data analyses, optimal seismic amplitude attributes were selected for the analysis of amplitude attributes and sandstone content in 38 drilled wells in the upper Oil Layer I, and it was found that these quantities were linearly correlated when source-constrained. The smaller the amplitude attributes of sediments from the same source, the higher is the sandstone content, and vice versa. Source-constrained seismic reservoir predictions quantified the relationship between amplitude attributes and sandstone content, improving the accuracy of reservoir predictions in the upper Oil Layer I of the Middle of the Sha 3 Member in Shahejie Formation.