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CX地区按二段储层为砂泥岩薄互层,埋深在2000～2700m之间,且砂岩速度大于泥岩速度。过去一直认为：砂岩含油气后,速度降低,含油性好的储层在地震剖面上就表现为弱振幅特征。然而,大量的实钻结果证实：“高产井（含油性好的储层）均对应剖面的强反射振幅。”为此,我们从正演模型出发,利用测井、岩芯测试数据,研究了该区的岩石物理特征和沉积相特征,以及产生特殊地震相特征的物理基础和地质基础,建立了正确的油气检测标志,从而使CX地区的钻井成功率从过去的47.6％提高到96％以上。
In the CX area, the second-stage reservoir is a sand-shale thin interbedded layer with a buried depth of 2000-2700m and the sandstone velocity is greater than that of the mudstone. In the past, it has been thought that the lower velocity and lower oil content of sandstone reservoirs show the characteristics of weak amplitude in the seismic section. However, a large number of real drilling results confirm that “the high-yielding wells (good oil-bearing reservoirs) correspond to the strong reflection amplitudes of the profiles.” For this reason, starting from the forward model, we used well logging and core testing data The petrophysical characteristics and sedimentary facies characteristics of the area, as well as the physical basis and geological basis for generating the special seismic facies characteristics, have established the correct oil and gas detection signs, thus increasing the drilling success rate in the CX region from 47.6% in the past to over 96% .