四川新场三分量地震勘探试验研究

四川新场地区以超致密砂岩裂缝孔隙性气藏为主，新851井在深层获得了良好的天然气显示。但以往的资料不能很好地描述裂缝的发育情况，为此，开展了二维三分量地震勘探试验研究。首先，基于地球物理模型对转换波的采集参数进行了论证，分析讨论了道间距和炮检距对资料所产生的影响；然后，通过潜水面和低、降速带调查、激发和接收方式试验以及降低环境噪声等手段，探讨了提高资料信噪比和分辨率的有效方法；最后，确定了野外资料采集施工方案。该方案在新场地区的实施，使得三分量地震资料的品质较之老三维地震资料有了很大的提高。与老三维地震资料的对比表明，新资料能更好地反映地下地质特征。

Experiment of 3-component seismic survey in Xinchang area

Sichuan Xinchang area is one of the main gas-bearing fields in Sichuan province,and mainly is super-compactness sand fractured gas reservoir. The Xin 851 well shows the fairly good exploration prospect. In order to estimate azimuth, orientation and density, lithology identification of fracture with P-S wave, drilled into the reservoir formation pattern of super-compactness sand fractured gas reservoir. Meantime provide technology support and foundation data for 3-D 3-component seismic survey. 3-component seismic data of high quality are got at the first time. Demonstrating the acquisition parameter of field layout is problem for converted wave based on geophysics model and on increasing seismic data S/N ratio and resolution. The new seismic data is better reflecting the geologic feature than old seismic data.