纵横波联合解释技术在气云区的应用

柴达木盆地三湖地区是青海油田天然气主产区，但由于该区第四系生物气气藏具有地层沉积时代新，成岩作用差，岩石结构疏松等地质特征，导致气云区地震构造成像差、低丰度气藏预测精度低等诸多难题。基于"低频+横波"多波二维联合激发的油气勘探攻关试验获得的高品质纵波及纯横波资料，采取了纵横波联合标定、联合解释、联合属性分析等技术攻关，结果表明：三湖地区浅层存在微小断裂，发现了多个低幅度构造圈闭及地震异常圈闭，初步形成了一套适用于三湖地区浅层生物气的纵横波联合解释配套技术，该技术充分展现了纵横波联合地震勘探技术的良好应用前景。

Application of PP-wave and SS-wave joint interpretation technology in gas cloud area

Sanhu area in Qaidam Basin is the main natural gas producing area of Qinghai Oilfield. However, Quaternary biogas reservoirs in this area have many geologic characteristics,such as new stratigraphic sedimentary age,poor diagenesis and loose rock structure,which lead to poor seismic structural imaging and low prediction accuracy of low abundance gas reservoirs in gas cloud area. Based on the high-quality P-wave and pure SSwave data acquired from the 2-D joint excitation test of"low frequency+S-wave"for oil and gas exploration,the joint calibration,joint interpretation and joint attribute analysis of PP-wave and SS-wave were adopted. The results show that there are micro-faults,and many low-amplitude structural traps and seismic anomaly traps have been found in the shallow layer of sanhu area. A set of PP-wave and SS-wave joint interpretation supporting technologies applicable for the shallow biogas in Sanhu area was formed,which fully shows the good application prospects of the PP-wave and SS-wave joint seismic exploration technology.