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济阳拗陷有 10 0多口井在泥岩地层中见到良好的油气显示 ,其中河口地区 10多口井获商业油流或高产商业油流 ,一般地这些泥岩裂缝油气藏呈条带状分布在沙三段下部地层中 ,以自生自储为主 ,泥岩地层富含钙质或砂质。针对该地区的地质特点及多波勘探技术优势 ,在河口地区部署及实施了 8条二维测线的多波勘探 ,其中东西向测线 4条 ,南北向测线 4条。室内建立了各测线的 VP及 VS速度模型 ,获得了纵波及转换波的叠加剖面及有关参数剖面。目的层的含油裂缝泥岩体现了纵波层速度明显降低 ,而转换波层速度几乎不变化的基本特征。AVA反演和裂缝参数反演结果与目的层的地质结构基本吻合 ,特别是由快、慢横波分离求取的裂缝参数正确反映了泥岩裂缝等各向异性信息 ,预测出的泥岩裂缝发育主方向与钻井提供的裂缝方向及断层的走向基本一致 ,预测的裂缝发育程度与油井产量有很好的一致关系。泥岩裂缝发育区分布呈北东走向的特点 ,为今后确定井位提供了宏观指导的依据。
More than 10 wells in the Jiyang depression show good oil and gas shows in mudstone formations, of which more than 10 wells in the estuary are under commercial or high-productivity commercial oil flow. Generally, these mudstone fractured reservoirs have a banded distribution In the lower part of the third member of the Third Member of the Shahejie Formation, self-hosted and self-storage, mudstone is rich in calcareous or sandy. In view of the geological features of the area and the advantages of multi-wave exploration technology, eight multi-wave surveys of two-dimensional surveying lines have been deployed and implemented in the estuary. Thereinto, there are 4 east-west survey lines and 4 north-south survey lines. The VP and VS velocities of each line were established indoors, and the superimposed sections of the longitudinal and converted waves and the related parameters were obtained. The oil-bearing fractured mudstone of the target layer shows the basic characteristics that the velocity of P-wave layer obviously decreases while the velocity of converted-wave layer hardly changes. The results of AVA inversion and fracture parameter inversion basically coincide with the geological structure of the target layer. Especially, the fracture parameters calculated by fast and slow shear waves correctly reflect the anisotropy information of mudstone fractures, etc., and predict the main direction of fracture development of mudstone It is consistent with the direction of fracture and the trend of the fault provided by drilling. The prediction of degree of fracture development is in good agreement with the well production. The distribution of mudstone fractured development zone is characterized by the northeastward trend, which provides the basis for macro guidance for determining the well position in the future.