| Currently, identify exploration object is becoming more and more difficult, so the requirements of the quality of seismic data is higher. By improving the quality of seismic data, it can improve the cognition of field situation, effectively guide the well placement and improve recovery. So improve seismic data processing technology becomes increasingly important.Weizhou 11-1 n oilfield in the south China sea southwest of Bei Bu gulf waters, the oil field is located in Southwest Wei Zhou Depression central No. two fault。Wei southwest sag is a typical continental down faulted basin, the overall performance for the North fault and South super half graben. The oilfield reservoir type is relatively complex, both the reservoir structure, compound structure and lithology of the reservoir. Found in the oil production process, the existing seismic data of lower quality can not effectively identify the fault, the fine reservoir description could not be launched, strata imaging is not true, the interpretation of the sand body boundary exist multiple solutions. In the face of such problems, by studying the latest seismic data imaging method to improve the quality of seismic data, improve the seismic data of oilfield development. This article is in view of the complex structure of seismic data imaging problems.This paper is based on the seismic data imaging of complex structures problems. A migration imaging algorithm is the key of high resolution imaging, the accuracy of imaging velocity model is more accuracy and reliability restricts the structure migration results. Article on the basis of summarizing the predecessors’ research, the seismic reflection wave imaging in complex structure is studied. Involves the influence factors of reverse-time migration imaging, improve the signal-to-noise ratio of seismic data, improve the resolution, multiple attenuation, amplitude preserving processing, prestack depth migration velocity modeling. Through this research puts forward the suitable for Wei Zhou 11-1Ncomplex structure imaging processing. To improve the signal-to-noise ratio by appropriate resection, linear interference suppression of T-X, F-X and other methods to suppress noise. Using pre-stack and post-stack appropriately at the same time improve resolution, get the resolution of seismic data is higher, the interlayer information more rich, more clear breakpoint. Seismic data in the area for different duration of acquisition of seismic data, and to make relative image processing, to take the bin rules, NMO method, processing results and understandings consistent. Prestack depth migration velocity model is the key to the imaging accuracy, accurate velocity model of the need to deal with the fine in the conventional prestack data obtained by selecting target line for multiple iterations. To obtain more accurate imaging, in view of the flower fault development area and relatively low signal-to-noise ratio of area is to encrypt the range interval velocity control. Finally using the reverse-time migration prestack depth imaging, effectively improve the effect of the seismic data imaging. Compared to the original prestack time migration results, new processing seismic data in shallow, middle and deep data signal-to-noise ratio and resolution of all do a good balance, realize the effective protection of the seismic signal of each frequency band signal, phase continuous improvement, frequency spectrum component of the rich, the main frequency of increasing makes the reverse-time migration results data resolution was improved. The processing result is accordance with the dynamic reservoir knowledge. |
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