鄂尔多斯盆地盒8段气藏烃类检测技术研究

HYDROCARBON DETECTING TECHNIQUE OF Psh^8 GAS RESERVOIRS IN E’ERDU OSI BASIN

鄂尔多斯盆地上古生界盒8段气藏属典型的低孔低渗的砂岩岩性气藏,受沉积环境的影响,盒8 段储层在盆地中较为发育,但储层段物性及含气性在横向上存在着严重的非均质性〔1〕。因此,在鄂尔多斯盆地利用地震烃类检测技术进行含气性预测,就成为寻找优质储层的关键技术。文章从SLG气田盒8段气藏入手,通过Aki-Richards公式AVO 建模、结合多波二维〔2〕地震资料,深入研究了SLG盒8段气藏的烃类检测方法。研究认为,在地震资料进行高保真振幅处理的基础上,采用AVO 技术对鄂尔多斯盆地盒8段砂岩气藏进行烃类检测是可行的。

The Psh8 (eighth member of Shihezi Formation, Permian) gas reservoirs in E'erduosi Basin belong in the typical sandstone lithologic ones with low porosity and low permeability. Owing to the influence of sedimentary environment, the Psh8 reservoir is relatively developed in the basin, there exist, however, serious heterogeneities laterally in both petrophysical property and gas potential. Therefore it is very important for surveying the excellent reservoir to. predict gas potential by applying seismic bydrocarbon detecting technique in the basin. Proceeding from the Psh8 gas reservoir in SLG field and through AVO modeling and calculating by Aki-Richards equation, the authors investigated thoroughly the hydrocarbon detecting method for the Psh8 gas reservoir in the field in combination with the multiwave 2-D seismic data. Through investigation, it was considered that, on the basis of the high-fidelity amplitude processing of seismic data, it is feasible for the hydrocarbon detection of Psh8 sandstone gas reservoirs in E'erduosi Basin to adopt the AVO technique.