鄂尔多斯盆地苏里格气田高精度全数字开发地震技术

Full-digital and High-precision Seismic Technology in Sulige Gasfield in Ordos Basin

鄂尔多斯盆地苏里格气田是中国最大的陆上天然气田，因其薄互层非均质性强，阻碍了钻井成功率的提高。目前已经找到利用地震预测来经济有效地开发苏里格气田的方法．这就是基于逐点激发一单点数字检波器接收的高密度采集技术。高密度采集参数是建立在储层的地质和地球物理特征分析基础上，在地震处理中加入CDP道集保幅处理流程。可为叠前反演和AVO分析打下良好的基础。与常规检波器相比，数字检波器能更有效地保持远炮检距的振幅。该岩性地震预测的有效性已得到苏里格气田已知井的验证。目前全数字地震采集已是苏里格气田发展的一项重要技术．使得苏里格气田的钻井成功率提高了50％。现在该技术已广泛应用于长庆油田的油气勘探与开发中。

Sulige Gasfield in Ordos Basin is the largest onshore gas field in China. Thin interbeds in this region have strong heterogeneity, which hinders drilling success rate. Now an economical and effective method to develop Stdige Gasfield by use of seismic prediction is developed. That is dense acquisition technology through point by point excitation-single point receiving by digital geophone dense acquisition. Dense acquisition parameters were based upon the analysis on geological and geophysical characteristics of the reservoir. Addition of CDP gathers amplitude-preserving processing in seismic data processing provides better basis for pre-stack inversion and AVO analysis. Digital geophones prove to be more effective in preserving amplitude of far offset than conventional geophones. The effectiveness of seismic lithology prediction is proved by existing wells in Sulige Gasfield. At present, full-digital seismic acquisition technology has been a key technology in the development of Sulige Gasfield, enabling drilling success rate in Sulige Gasfield to increase by 50%. Now this technology has been widely applied in Ordos Basin of Changqing Oilfield.