惩罚函数法井约束地层压力预测

Log-constrained formation pressure estimation via SUMT method

1. 中国地质大学，湖北武汉430074;2. 河南石油勘探局，河南南阳473132

1. China University of Geosciences, Wuhan 430074, China;2. Henan Petroleum Exploration Bureau, Nanyang 473132, China

讨论了利用测井声波时差和地震层速度预测地层压力的方法及其应用。在单井压力预测的基础上,以测井资料作为约束条件,用地震层速度预测地层压力。采用惩罚函数法将约束最优化问题转化为无约束最优化问题,再用阻尼最小二乘法求解。离井近的地方约束程度大,离井远的地方约束程度小,使反演结果在保持总体趋势不变的情况下,与测井资料一致。运用上述方法处理了东营凹陷的实际资料,取得了较好的地质效果。

Logging sonic differential time and seismic interval velocity are used to estimate formation pressure in this paper. With the estimation of pressure in single wells, we take logging data as constraints to estimate formation pressure from seismic interval velocity data, SUMT method was adopted in the conversion of constrained optimization problem to unconstrained optimization problem. The latter was solved by the damped least square method. The closer a place to a well is, the stronger the constraints are. Therefore, the inversion results are in accordance with logging data while the pressure trend still keep.s unchanged. Satisfactory geological results have been obtained by applying the method to the real data from Dongying sag.