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RECOGNITION OF SAND-GRAVEL BODY AND FORECASTING ITS PETROLEUM-BEARING FEATURE IN NORTHERN STEEP SLOPE OF CHEZHEN SAG
Author(s): WANG Jin-duo, XU Shu-mei, Ji Jian-qing, Yu Jian-guo, Su Chao-guang
Pages: 93-
98
Year: 2008
Issue:
2
Journal: MARINE GEOLOGY & QUATERNARY GEOLOGY
Keyword: 相干分析; 欠压实超压带; 地震能量衰减; 沙三下亚段; 车镇凹陷;
Abstract: 车镇凹陷陡坡带沙三段砂砾岩扇体发育,但目前对砂砾岩体横向展布范围及砂砾岩体边界的划分尚不清楚,储层物性难以预测.首先,利用相干分析技术开展砂砾岩扇体沉积相的划分,明确了扇体的展布规律、分布范围、划清了砂砾岩扇体的边界.然后,利用声波、速度谱等资料探讨了沙三下亚段(Es3x)地层压力情况,认为Es3x存在欠压实超压带,车镇凹陷欠压实超压带的发现为寻找沙三段砂砾岩扇体储层物性良好发育区指明了方向.最后,利用地震高频能量衰减检测技术对储层物性进行了预测.通过地震高频能量衰减梯度法预测的储层物性良好发育区,位于研究区欠压实超压区带内,用地震能量高频波段的衰减特征不但可预测不同井位的储层物性,还可根据连井衰减梯度剖面的变化规律预测地震高频波段高衰减区的延伸范围.高频能量衰减梯度法预测的储层物性良好发育区带与实钻结果吻合度好.
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