| 时频分析技术在乐东区水道评价中的应用 |
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| 引用本文： | 邓勇,刘仕友,李洋森,李芳,周凡,付琛.时频分析技术在乐东区水道评价中的应用[J].地球科学,2019,44(8):2619-2626. |
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| 作者姓名： | 邓勇 刘仕友 李洋森 李芳 周凡 付琛 |
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| 作者单位： | 中海石油(中国)有限公司湛江分公司, 广东湛江 524057 |
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| 基金项目： | 十三五重大专项”莺琼盆地高温高压天然气富集规律与勘探开发关键技术”2016ZX05024-005 |
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| 摘 要： | 随着勘探进程的不断推进，在弱振幅反射特征的地层中寻找有利富含油气部位已成为新趋势.从乐东区已钻井岩石物理特征出发，通过对含气砂岩进行变孔隙度模拟发现，随着含气砂岩孔隙度不断增加，砂岩顶面叠后地震反射能量逐渐减弱，证实乐东区弱振幅也有可能为有利储层的表征；结合沉积韵律建立不同地层组合模型并提取其时频谱发现，时频特征方向性与地层组合有关，并且乐东区水道弱振幅与正旋回地层时频特征类似，水道内弱振幅为大套砂岩概率较大，钻井证实推测，说明该技术方法可靠，为乐东区深层油气勘探及钻探目标优选提供了重要指导.
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| 关 键 词： | 乐东区 高阻抗 弱振幅 时频分析 叠前反演 地球物理 |
| 收稿时间： | 2019-01-30 |
Application of Time-Frequency Analysis Technology in Evaluation of Channel in Ledong Area |
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| Abstract: | With the continuous progress of exploration,it has become a new development trend to find favorable oil and gas reservoir with weak amplitude reflection. In order to confirm the geological significance of weak amplitude reflection,the simulation of variable porosity has been carried out in Ledong (LD) area in this study,revealing the energy of seismic reflection decreases gradually with the increasing of sandstone porosity. It is confirmed in LD area that the weak amplitude may also be a sign of favorable reservoir. Combined with sedimentary rhythm,different models are established and the time-frequency spectrum is extracted. It is found that directionality of time-frequency characteristics is related to sedimentary association of strata,and the weak amplitude of the channel in LD area is similar to the time-frequency characteristics of the positive cyclic strata. There is a high probability that the weak amplitude in the channel is thick sandstone,which is confirmed by the drilling,showing that the technique is reliable. This study provides important guidance for deep oil and gas exploration and drilling target optimization in LD area. |
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