薄互层反演技术在水平井设计中的应用

介绍了一种在薄互层条件下，以地震解释的层位为控制，以测井曲线为出发点进行外推内插，形成初始波阻抗模型，通过对初始模型的不断更新，使得模型的合成记录最佳逼近实际地震记录。该方法把地震和测井有机地联合起来，突破了传统意义上的地震资料分辨率的限制，大大提高了薄层的识别能力。反演结果能明显反映出主力油层葡12、葡13层的横向变化，为成功完钻大庆第一口阶梯状水平井提供了有利技术保证。该技术用于肇州油田州603区块州62-平61水平井设计和轨迹调整中。最终州62-平61井钻遇水平段614m，葡12层水平钻进280m，向下调整钻遇葡13层，水平钻进334m，该水平井砂岩钻遇率74．4％，初期平均日产油30t以上，取得了显著经济效益。

The thin layer inversion technique applied in the design of horizontal wells

This paper introduces a method which is applied in the conditions of thin layer, this method extrapolates and interpolates the interpreted seismic layer, constrained by the logging curves, generating an initial wave impedance model. We keep modifying the initial modei until the synthetic seismic trace approaches the re-al seismic trace . This method combines the seismic data and logging data. It breaks the limit of the traditional seismic resolution and improves the capacity to recognize thin laver greatly. The in-version result can reflect the transverse variation of the main layer of PI2, PI3, it provides the technique guarantee for drilling the first ladder horizontal well successfully. This technique was used in de-signing the horizontal well Zhou602-ping61 in the Zhou603 area of the Zhaozhou oilfield and adjusting the drilling track . At last, 614 meters of well Zhou62-ping61 were drilled in the horizontal seg-ment. Horizontal segment of PI2 layer is 280 meters, then it is ad-justed down to drill PI3 layer, the horizontal segment of which is 334 meters. The drilled sandstone rate of this horizontal well is 74. 4% , in the early time this well produced 30 tons oil per day averagely. The obvious economic benefit has been achieved. It is very important to speed up the development of horizontal wells in the reservoirs with extra-low permeability.