塔里木盆地顺西区块地震反演及储层预测

Seismic inversion and reservoir prediction of Shunxi block in Tarim Basin

塔里木盆地顺托果勒西区块中下奥陶统碳酸盐岩储层埋藏深度大,非均质性强,岩体孔缝洞发育,但规模总体较小,井-震响应关系复杂,"串珠"状反射不明显,储层预测难度大。在地震反射特征和岩石物理分析的基础上,综合利用地质、地震和测井等资料,进行研究区奥陶系储层地震波阻抗反演,在有利区寻找低阻抗对应的缝洞发育线索,识别以蜂窝状密集分布但不足以形成"串珠"反射的小尺度、非规则溶蚀孔缝洞,结合敏感地震属性的综合分析,预测顺西区块奥陶系有利储集体的分布规律,为优选勘探目标提供依据。

The reservoir of low-middle Ordovician in Shunxi block of Tarim Basin is buried deeply,and has strong heterogeneity because of developed cave and fractures.But the scale of cave and fracture is small,and the response of well and seismic is complex.There is no apparent string reflection,so the reservoir prediction is difficult.Impedance inversion in Ordovician reservoir is comprehensive utilization of geology,seismic and log data based on seismic reflection features and petrophysics analysis.It can help to find the low impedance in favorable area which may develop cave and fracture.By this method,we can recognize the honeycomb small cave and fracture which do not enough to form string reflection.Then combined with seismic amplitude attribute and synthetic seismogram analysis,we could predict the distribution range and thickness of favorable reservoir in Shunxi block,and provide the basis for selection of exploration target.