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埕海油田二区构造复杂,断层发育,其东营组以上地层属于正常压力系统,而沙河街组压力系数大于1.20为异常高压层。本文从等效深度法的基本原理出发,讨论了基于测井资料的砂泥岩地层正常压实趋势线的构建问题,并利用声波时差值建立了工区地层正常压实趋势线及方程,由此预测了沙河街组的地层孔隙压力,其预测值与实测值误差较小,与实钻显示情况吻合。结果表明,只要建立合理的正常压实趋势线方程,采用等效深度法可以较好地解决沙河街组异常地层孔隙压力的预测问题。
The second zone of Qionghai Oilfield is complex in structure with fault development. The strata above Dongying Formation belong to normal pressure system, while the pressure coefficient of Shahejie Formation is greater than 1.20 for abnormal high pressure layer. Based on the basic principle of equivalent depth method, this paper discussed the construction of normal compaction trend line of sandstone and mudstone based on well logging data, and established the normal compaction trend line and equation of strata in the work area by using acoustic time difference. The formation pore pressure of Shahejie Formation is forecasted, and the error between predicted value and measured value is small, which is in good agreement with actual drilling. The results show that as long as the reasonable normal compaction trendline equation is established, the equivalent depth method can well solve the prediction of pore pressure in abnormal formation in Shahejie Formation.