叠前深度偏移技术在江苏火成岩地区的应用

The application of prestack depth migration in igneous rocks area of the Jiangsu Oilfield.

中国石油化工股份有限公司江苏油田分公司物探技术研究院, 江苏南京210046

Geophysical Technology Institute of Jiangsu Oilfield,SINOPEC,Nanjing 210046,China

江苏油田苏北盆地地下构造复杂,火成岩分布广泛,速度横向变化大,用常规时间偏移资料很难得到准确的地质信息。针对江苏油田 ZH 地区的实际情况,建立了一套实用有效的叠前深度偏移流程。处理结果表明, 叠前深度偏移剖面较之叠后时间偏移剖面品质有较大的提高,偏移归位准确,地质体的成像整体上有明显改善, 火成岩下伏地层的反射能量有所提高,剖面的信噪比较高。利用叠前深度偏移资料解释的目的层层位,与实钻结果差异较小。

The Subei Basin in Jiangsu Oilfield has complex struc- ture.Igneous rocks are distributed widely and lead to later- al velocity variety.The general seismic data of time migra- tion are difficult to acquire the geological information exact- ly;3-D prestack depth migration is an ideal technique for solving the seismic imaging problem in complex subsurface condition structure and high lateral varying velocity.Using 3-D prestack depth migration processing software Views, the paper shows 3-D prestack depth migration parallel pro- cessing for seismic data in ZH area of Subei basin,a rea- sonable processing flow was presented.The migration re- sults with correct position and significant improvement on imaging structures complicated.The reflection energy of underlying formation in igneous rock areas,the S/N is highly in the section.The interpretation precision of target horizon by using prestack depth migration data is high com- pared to real drilling.