| 基于相控的振幅补偿法在渤海B油田储层预测中的应用 |
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| 引用本文： | 韦红,宋俊亭,田涛,张鹏志.基于相控的振幅补偿法在渤海B油田储层预测中的应用[J].CT理论与应用研究,2021,30(6):681-690. |
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| 作者姓名： | 韦红 宋俊亭 田涛 张鹏志 |
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| 作者单位： | 中海石油(中国)有限公司天津分公司渤海石油研究院, 天津 300459 |
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| 基金项目： | 中海油总公司重大攻关项目（渤海油田特殊地质条件下地震振幅影响机理及对策研究（YXKY-2019-TJ-02））。 |
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| 摘 要： | 渤海B油田主要目的层为东营组，与上覆馆陶组底部相距50~80 m。馆陶组底部发育1套或多套高速高密砾岩，局限分布，致能量损失，使下伏储层的地震响应变弱，严重影响着储层真实范围的识别。为此，本文首先从地震波传播理论出发，分析砾岩致能量的反射与透射损失效应。其次基于正演模拟，分析砾岩致能量损失程度，相同的累积厚度，砾岩的层数越多，损失越大；据正演模拟结果及井震结合，描述3种地震相即单套砾岩、多套砾岩、无砾岩的平面展布形态，再结合地震属性定量分析储层能量损失程度的平面分布范围。然后提取不同地震相的能量补偿因子，提出基于相控的能量补偿法进行相应的振幅补偿，即单套砾岩造成的能量损失主要进行反射系数补偿，对多套砾岩造成的能量损失主要进行多次透射系数的补偿。最后定量消除上覆馆陶组砾岩对下伏东营组储层的能量屏蔽影响，刻画出储层的真实平面范围，并获得钻井成功，充分证明了本次研究的有效性，并实现精确预测潜力区域。
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| 关 键 词： | 砾岩 能量补偿 屏蔽 反射 透射 |
| 收稿时间： | 2021-06-21 |
Application of Amplitude Compensation Method Based on Phase Control in Reservoir Prediction of Bohai B Oilfield |
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| Institution: | China National Offshore Oil Corporation Limited Tianjin Branch, Tianjin 300459, China |
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| Abstract: | The main target layer of Bohai B Oilfield is the Dongying Formation, which is 50-80 meters away from the bottom of the overlying Guantao Formation. There are one or more sets of high-speed, high-density and limited-distributed conglomerates developing at the bottom of the Guantao Formation, they cause energy loss, weaken the seismic response of the underlying reservoir and seriously affect the identification of the true range of the reservoir. For this reason, in this paper, starting with the theory of seismic wave propagation, firstly, we analyze the reflection and transmission loss effects of conglomerate-induced energy. Secondly, based on the forward simulation, the degree of energy loss caused by the conglomerate is analyzed, which is the same cumulative thickness. With more layers of conglomerate come greater losses. Based on the forward simulation results and the well-earthquake combination, we describe the plane distribution range of the three seismic phases, which are single set of conglomerates, multiple sets of conglomerate and non-conglomerate rock. Furthermore, combined with seismic attributes, we perform quantitative analysis on the plane distribution range of the energy loss of the reservoir. Then we extract the energy compensation factors of different seismic phases, and propose the phase-controlled energy compensation method for corresponding amplitude compensation. That is, the energy loss caused by single set of conglomerate is mainly compensated by reflection coefficients while the energy loss caused by multiple sets of conglomerate is mainly compensated by transmission coefficients repeatedly. Finally, we quantitatively eliminate the energy shielding influence of the overlying Guantao formation conglomerate on the underlying Dongying formation reservoir, portray the true plane range of the reservoir, and obtain drilling success, which fully proves the validity of this research and realizes accurate prediction of potential area. |
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