YB东地区珍珠冲下亚段河道精细刻画研究
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摘要
珍珠冲下亚段扇三角洲河道沉积储层是YB地区陆相层系重要的勘探目标之一,由于河道变迁频繁,河道砂体叠置,给河道的精细刻画带来困难。在单井地质特征分析及连井精细对比的基础上,进行二维地质模型正演,明确河道沉积的地震响应特征。在确定河道响应特征的基础上,应用谱分解技术及多属性分析技术,对河道边界进行识别并进行手工追踪,精细刻画了研究区河道砂体的展布,对储层的有利发育区进行预测。通过与已钻井的对比,储层发育区与钻井资料吻合度高,证实了该方法的有效性,同时为YB东部珍珠冲段河道沉积储层的进一步勘探提供了参考。
Fan delta sedimentary reservoir in the lower sub-member of Zhenzhuchong section is one of the most important exploration targets in the continental strata of YB area. Because of the frequent changes of fluvial channels, that channel sands stacked brings the detailed description many difficulties. Based on the geological characteristics analysis of single well and the comparison of sequence stratigraphy of the connected wells profile, 2D geology model forward technology was used to identify the seismic response characteristics of channel deposits. Than spectral decomposition technology and multi-attribute analysis techniques were used to identify the river boundary and manually track the river boundary. Finally, the distribution of channel sand bodies and the beneficial area of reservoirs in the study area were predicted in derail. Through results contrast between logging and drilling, it is found that the predication area and the known drilling data were highly consistent. The results confirmed the effectiveness of this method and provided a reference for similar problems.
引文
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