平湖油气田放鹤亭构造平湖组储层精细反演

Detailed inversion of reservoir in Pinghu formation of Fangheting structure in Pinghu field.

平湖油气田放鹤亭构造平湖组气藏已进入开发中期,油气水关系复杂,为提高采收率,需要了解平湖组气藏的砂体空间展布。为此,开展了储层精细反演。首先对古近系始新统平湖组、渐新统花港组的测井曲线进行了环境校正;在此基础上,采用精细小层对比约束下的岩石物理分析方法,得到平湖组储层波阻抗总体偏低的认识,认为可以采用波阻抗对储层进行描述。采用精细井震标定、子波提取、精细地质建模、低频分量选取、λ参数选取和叠后约束稀疏脉冲波阻抗反演等技术的储层精细反演方法,对平湖组储层进行了精细反演,绘制了平湖组各气藏波阻抗均方根平面图,对砂体的展布进行了描述,预测了新的含气砂体面积。

The gas pool of Pinghu formation is now at the middle devel- opment stage and the relationship between oil,gas,and water is complicated.In order to improve recovery ratio,the spatial distribu- tion of sand bodies in Pinghu formation should be identified.There- fore,detailed reservoir inversion was carried out.Firstly,logging environment was corrected on the logging data of Pinghu formation and Huagang formation.On the basis,the rock physical analysis method restricted by careful sub-layer contrast was used to obtain the conclusion that the wave impedance was totally low in Pinghu reservoirs and wave impedance could describe the reservoirs.Some methods were adopted to fine inverse the reservoirs of Pinghu for- mation,including fine seismic-well calibration,wavelet extraction, fine geologic modeling,low-frequency selecting,λselection and post-stack constrained sparse pulse wave impedance inversion.The root-mean-square ground map of wave impedance in all gas pools of Pinghu formation.The distribution of sand bodies was described, and the new gas-bearing area was predicted.