地震技术在车排子地区岩性油藏勘探中的应用

Application of seismic techniques in exploration for lithological reservoirs of Shawan Formation in Chepaizi area

针对车排子地区岩性油藏砂体厚度较薄,横向变化快、规模小的难题,探讨了岩性油藏预测的研究思路和配套技术。以地震、地质资料为基础,通过对储层岩石物理特征的分析,利用模型正演分析技术,验证了油砂体的"类亮点"地震反射特征。在单井相分析的基础上,利用地层切片技术划分有利相带,地震属性分析技术和分频检测技术清晰地勾画出砂体边界,结合振幅-厚度半定量来识别油砂体,在此基础上提出了针对性的储层预测方法,应用取得了较好的效果。

The sand bodies of lithologic reservoir are thin,small,and changing laterally quickly in Chepaizi region.Aiming at theses problems,this paper discussed the methods suitable for lithologic reservoir prediction.Based on seismic and geological data,by means of rock physical analysis and forward modeling,we proved that oil sand bodies have a seismic reflection character similar to bright spot.On the base of single well facies analysis,oil sand bodies were identified semi-quantitatively by using seismic sedimentology,and the boundaries of sand bodies were delineated using seismic attribute analysis and frequency decomposition technique.The proposed method has yielded satisfactory results.