地层视垂直厚度分析在油田小层对比中的应用

Application of stratum visual thickness analysis to subzone correlation

李振鹏 马存飞 刘春艳 刘洪洲 刘建国1

中海石油（中国）有限公司天津分公司渤海石油研究院，天津 300459 中国石油大学（华东）地球科学与技术学院，山东 青岛 266580

Bohai Oilfield Research Institute, Tianjin Branch of CNOOC Ltd., Tianjin 300459, China School of Geosciences, China University of Petroleum, Qingdao 266580, China

随着油田综合调整措施的不断实施，油田井型逐渐多样，油层段内开发井井斜角差异较大。受地层倾角及井斜角影响，小层对比过程中,不同井型之间地层视垂直厚度存在的差异不仅影响了小层划分及对比结果的准确性，同时也制约了后续注采调控及随钻预测的实施效果。文中结合渤海海域典型油田的钻井、测井及地震资料，建立了7种地层视垂直厚度差模型，并对视垂直厚度差进行了量化。结果表明：当地层产状水平或所钻井均为直井时，钻井揭示的地层视垂直厚度基本一致；当地层产状倾斜且所钻井中包含斜井时，钻井的地层视垂直厚度存在差别，地层视垂直厚度差与地层真厚度、地层倾角及井斜角有关。利用地层视垂直厚度校正方法，对油田小层对比结果进行校正，并取得了较好的开发效果。

With the continuous implementation of comprehensive adjustment in the oilfields, the well types and the well deviation angles vary greatly. Affected by the formation dip angles and the well deviation angles, the visual stratigraphic thickness is different in the process of subzone correlation, which not only brings difficulties to the subzone classification and correlation, but also influences injection-production adjustment effects. Combined with the drilling and tectonic information in the typical oilfields of Bohai Sea, seven types of stratigraphic thickness differentiation model are established and the visual thickness difference is quantified in this article. The result shows that the visual stratigraphic thickness is basically the same when the formation occurrence is horizontal or the drilling wells are all vertical, however, it will be different when the formation occurrence is inclined and the deviated wells are included. The visual stratigraphic thickness difference is related to the true stratum thickness, the formation dip angle and the well deviation. Using method of visual stratigraphic thickness correction, the subzone correlation results are re-corrected, and the oilfield development effects are improved.

10.6056/dkyqt201805017