新场地区三维三分量地震勘探实践

3C3D seismic exploration in Xinchang area

(1.中国石油化工股份有限公司油田勘探开发事业部,北京100728;2.大庆石油学院地球科学学院,黑龙江大庆163318;3.同济大学海洋与地球科学学院,上海200092)

SINOPEC Exploration and Development Department,Beijing 100728,China

新场地区须家河组气藏深层致密储层孔隙度和渗透率低,含气层与围岩之间的地震响应差异小,如何利用有效的地球物理信息进行储层含气性检测及流体判别是该区深层勘探的关键。进行了须家河组地层的转换波各向异性测试，结果表明该地层具有明显的各向异性特征,适宜进行三维三分量地震勘探。建立了多波微测井方法,制作了重锤横波震源,进行近地表探测试验,纵波和横波的近地表结构厚度不同,速度亦有明显差异。发展了多波地震资料处理的关键技术,确立了多波地震资料的处理流程。进行了储层识别和裂缝特征预测,建立了高渗区地震响应模式。分析纵波与横波单一属性参数及组合参数裂缝检测效果,形成了有效的综合含气检测指数,其高值区与多口高产井区吻合。

The deep tight reservoir of Xujiahe Gasfield in Xinchang area has low porosity and low permeability,the seismic response of gas-bearing layers and bedrock has small difference.How to apply effective geophysical information to detect gas-bearing area and distinguish fluid is the key for the exploration of the area.Converted-wave anisotropy test shows that the target layer in Xujiahe Formation has obvious anisotropy,which is suitable for 3C3D exploration.Multi-wave uphole survey method was proposed and shear wave source was made to test near surface.The result shows that the thickness of near-surface structure from P-wave and S-wave are different,the velocity is also obviously different.The key technology for multi-wave data processing was developed and its workflow was identified to carry out reservoir recognition and fracture characteristics prediction,and establish seismic response pattern of high-permeability area.By analyzing the detection result of fracture by single parameter or combination parameters of P-wave and S-wave,effective integrated gas-bearing detection indexes were formed,and their high value area coincides with several high-production well areas.