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OALib Journal期刊
ISSN: 2333-9721
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渤南洼陷钻前地层压力地震预测
Keywords: 渤南洼陷,叠前偏移地震速度谱,压力预测,三维超压体
Abstract:
？沾化凹陷渤南洼陷沙三段和沙四段普遍存在着异常高压。为全面了解该区纵、横向压力分布特征，采用叠前时间偏移速度谱资料，利用vsp速度，应用fillippone公式压力预测模型，成功地预测了渤南洼陷的孔隙压力体。采用vsp测井优化校正地震层速度，可以使速度误差小于8%，从源头上降低地层孔隙压力的不确定性。在确定研究区相对应的模型参数前提下，依照每个速度谱点分别求取最大、最小压实速度，为压力预测模型提供了良好的速度处理方法。利用经校正的速度资料和预测模型，获得了流体压力的三维数据体，可以从任意方向切片观察凹陷内压力的空间展布。由于地震垂向分辨率影响着地震速度精度，再加上多种地质因素影响地震速度，从而导致地震预测压力值与实测值存在误差。经速度校正系数和实测值的校正，82%的统计数据误差在±10%的允许范围内，基本能满足勘探、开发的需要。
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