应用三维地震解释方法识别裂缝

Identifying fractures using 3D seismic interpretation technique

裂缝的存在会引起地震反射特征的改变,应用三维地震解释技术可以依据这些反射特征的差异识别、预测裂缝。在观察和统计大量岩心裂缝发育特征的基础上,深入研究了新肇油田葡萄花油层区域、局部构造裂缝的基本特征、发育规律和分布范围。利用新肇油田的三维地震资料,首次在大庆外围低渗透油田尝试利用地震解释技术对裂缝进行识别和预测,同时指出:研究区内葡萄花油层的构造裂缝主要发育于粉砂和过渡岩性中;在裂缝形成过程中,主要受到构造部位的控制和断层的影响;利用地震解释技术得到的裂缝预测结果在区域上与地质分析成果有很好的一致性。

The existing of fractures can result in the change of seismic reflection characters, so it is feasible to identify and forecast. fractures depending on the differences between these reflection characters with 3 D seismic interpretation technique. On the basis of observation and statistics of growing characters of rock-cores, we researched deeply the basie characters, growing rules and distribu-ling areas of Putaohua layer of Xinzhao oilfield. Using 3 D seismic data of Xinzhao oilfield, it is the first time to attempt to identify and forecast fractures with seismic interpretation technique, and indicates that there are siltstones and transition lithologies inside the Putaohua layer. Fractures are controlled mainly by the position of structures and influenced by faults. There are good consistencies between the forecasting result of fractures with seismic interpretation technique and result of geologic analysis.