塔中顺9区块柯坪塔格组下段储集层预测

塔里木盆地塔中地区志留系柯坪塔格组为滨岸相沉积,目的层段砂体低孔低渗,横向变化大,泥岩夹层和单砂体厚度较薄,储集层埋深在5 500~6 000 m,由于吸收衰减,地震资料分辨率较低,储集层预测难度很大,采用拓频处理、振幅属性分析、瞬时相位和波阻抗反演等技术,根据柯坪塔格组储盖组合中泥岩盖层密度和波阻抗值普遍高于其下砂岩储集层的特点,进行储集层预测,取得了较好的效果。

Reservoir Prediction of Lower Member of Silurian Kepingtag Formation in Shun-9 Wellblock of Tazhong Area in Tarim Basin

The Silurian Kepingtag formation in Tazhong area in Tarim basin belongs to littoral facies sediment,and its target intervals are characterized by low-porosity and low-permeability,great lateral changes and thin mudstone interlayer and sand body.The burial depth of reservoir ranges from 5 500 m to 6 000 m.Because of absorption and attenuation,the resolution of seismic data is relatively low,resulting in difficult reservoir prediction.This paper adopts such techniques as frequency extension processing,amplitude attribute analysis,instantaneous phase and wave impedance inversion,based on the mudstone cap-rock thickness and wave impedance that normally higher than underlying sandstone reservoir,gets good results for reservoir prediction.