摘要
由于四川盆地地层构造复杂、储层横向变化大、非均质性较强,用常规测井资料进行水平井地质导向难度较大。研究了地震属性在四川盆地复杂地层地质导向中的应用。地震属性指的是由叠前或叠后地震数据,经过数学变换而导出的有关地震波的几何形态和运动学特征,能比较真实地反映岩石的物理特征,可用于描述储集体的几何形态、构造特征和储集轮廓。地震属性包含了丰富的地质信息,特别是近年来兴起的曲率体、蚂蚁体等属性提取技术,能很好地识别测井资料难以辨别的小断层和裂缝(孔洞),在预测储层发育带的同时为钻井风险的预判提供了依据。实际应用证实地震属性提取技术能够为现场地质导向决策提供技术支撑,在提高储层钻遇率和降低钻井工程风险方面发挥了积极作用。
Horizontal well logging while drilling is a multi-disciplinary integrated technology.In the Sichuan Basin,due to its complex stratigraphic structure,large lateral variation of reservoirs and strong heterogeneity,conventional logging data cannot provide support for the geo-steering.This paper studies the application of seismic properties in geo-steering in the complex stratigraphic of the Sichuan Basin.Seismic attributes refer to the geometrical and kinematic characteristics of seismic waves derived from pre-stack or post-stack seismic data and derived from mathematical transformations. Which can reflect the physical characteristics of rock more realistically,and can also be used to describe the geometry,structural features and reservoir outline of the reservoir.Seismic attributes contain a wealth of geological information,especially in recent years,popular attribute extraction techniques such as curvature bodies,ant bodies,etc.,can well identify small faults and fractures(holes)that are difficult to distinguish from logging data.These techniques not only predict the reservoir development zone,but also provide a basis for predicting drilling risks.The practical application proves that seismic attribute extraction technology can provide technical support for on-site geo-steering decision-making,meanwhile it plays an active role in improving drilling rate and reducing drilling risk,which is worthy of promotion.
引文
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