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针对渤海湾盆地黄河口凹陷渤中263油田明化镇组下段浅水三角洲水下分流河道多期次砂体表现出的强烈非均质性,综合应用井-震数据、采用多种方法进行储层平面非均质性定量描述,并体现到地质建模和井位部署中,以降低储量风险、落实潜力、优化开发井位、指导ODP方案(整体开发方案)的编制和决策。岩石物理分析发现,该油田以密度反演为主的拟阻抗可以很好地反映砂、泥岩的变化。通过阻抗体上提取的振幅和相干信息,可以识别平面岩相变化、废弃河道、点坝以及小断层分布。这些信息可以在属性模拟时约束平面渗透率变化。对于强不连续位置,还可以设置虚拟断层以表征砂体内部的不连通性。利用短时窗傅氏变换频谱分解技术以及差异频谱所反映的吸收衰减现象,在频率域通过调谐振幅的成像特征研究了储层横向变化规律,定量求取了砂体厚度,并成功检测了含油气砂体。
Aiming at the strong heterogeneity of sub-sand bodies in the submarine distributary channel of the shallow water delta in the lower part of Minghua Town Formation of Bozhong 263 Oilfield in the Huanghekou depression, Bohai Bay Basin, comprehensively using well-seismic data, a variety of methods for reservoir Plane heterogeneity Quantitative description, and reflected in the geological modeling and well site deployment, in order to reduce the reserves risk, implementation potential, optimize development wells, and guide the ODP program (overall development program) preparation and decision-making. Petrophysical analysis shows that the quasi-impedance based on density inversion can well reflect the changes of sand and mudstone. The amplitude and coherence information extracted from the impedance body can identify the variations of the lithofacies, the abandoned river channels, the point dams and the distribution of small faults. This information can constrain the plane permeability changes as the property is modeled. For strongly discontinuous locations, it is also possible to set up virtual faults to characterize the inter-connectivity within the sand body. Using the short-time Fourier transform spectral decomposition technique and the absorption attenuation phenomenon reflected by the difference spectrum, the lateral variation of reservoirs was studied in the frequency domain by the tuning amplitude imaging features, the thickness of the sand body was quantitatively determined, and the oil content Gas sand body.