近海四分量地震构造勘探效果分析

近海四分量地震是一项新的地震勘探、开发技术。由于纵波和横波的质点振动方式、传播机理是不一样的,对地层的含流体性的敏感性也是不一样的。地层流体对纵波的传播速度的影响、能量的吸收和屏蔽均比横波严重。由于浅层气和热流体的共同影响,导致纵波剖面上出现大量的、严重的地震反射模糊区（气云）,使得构造落实十分困难,气藏面积和储量难以准确确定。在转换横波剖面上,基本不存在气云,对构造高点和构造形态的落实很有帮助。近海四分量地震的构造勘探效果是很好的。

Analysis on prospecting effects of offshore 4-C seismic structure.

Offshore 4 C seismology is a new seismic exploration and development technology. Because of different particle vibration mode and transmission mechanism of shear wave and P wave, the sensibility to existence of the fluid in formation is different. The fluid in formation has more serious impact on transmission velocity, absorption of energy and shield for P wave than for shear wave, so that there exists a large amount of seriously blurred seismic reflection zone ("gas chimney") which is very difficult to determine the structure, accurately calculate the area and the reserve of gas reservoir. There basically no exists the gas chimney on P SV converted wave section, which is a great help to determine the structural high and feature. The structural exploration results of offshore 4 C seismology are excellent.