平湖油气田储层层速度特征研究

速度研究是储层横向预测的基础。利用 VSP测井数据和声波测井数据对东海平湖油气田储层段的层速度变化规律进行了研究 ,其结果表明 :储层段不同岩性 (砂岩、泥岩、煤层和钙质夹层 )的速度范围和变化规律不同 ;花港组砂岩含油后速度变化不明显 ,平湖组砂岩含气后速度明显降低 ;不同油组、不同沉积相和不同深度砂、泥岩的速度变化规律不同 ;平湖组下段 (P1 1 砂组以下 )泥岩欠压实带明显存在速度异常 ;层速度与孔隙度呈负相关关系 ;在平面展布上 ,储层层速度与沉积相有一定的关系 (有待进一步研究和探讨 )。在储层研究和预测过程中 ,认识并掌握砂、泥岩层速度的纵向变化规律以及层速度与岩性、含油气性、孔隙度之间的关系 ,是储层横向预测的基础

A STUDY OF RESERVOIR INTERVAL VELOCITY IN PINGHU OIL AND GAS FIELD

Velocity study is the basis of lateral reservoir prediction.Using VSP and acoustic logging data,variations of interval velocity are studied in Pinghu oil and gas field,East China Sea,leading to the following results:(1)Different rocks(sand,shale,coal bed and calcrete)in reservoir have different range and variation in interval velocity;(2)The oil bearing sand of Huagang formation doesn't show obvious velocity variation,and the gas bearing sand of Pinghu formation decreases significantly in velocity;(3)There are different variations of velocity in various pay zones,sedimentary facies,sands and shales with different depth;(4)The uncompacted shale of Lower Pinghu formation shows a significant interval velocity anomaly;(5)The interval velocity has a negative correlation with porosity;(6)Laterally,reservoir interval velocity may be related to sedimentary facies,which however,needs a further study.Clearly,it can provide a foundation for lateral reservoir prediction to understand vertical variations of interval velocity for sand and shale and correlations of interval velocity with lithology,hydrocarbon content and porosity.