The development zone of Ansai Oilfield,Changqing,was typically characterized for its low-permeability,low-porosity and low-yield conditions and complicated surface and underground conditions.To solve the problem related to prediction of remaining oil from the old field,BGP Inc.adopted the research mindset of borehole-surface seismic integration and developed and tested the DAS joint VSP and 3D surface seismic technology to predict the remaining oil of the development zone for the first time in China.The DAS joint VSP and 3D surface seismic exploration led to reciprocation of the advantages between surface seismic survey and in-the-well seismic survey,thus achieving good results.(1)Based on synchronous well drive processing,the fidelity and resolution of 3D seismic data were apparently improved,widening the effective frequency bands by more than 8 percent.(2)Based on the study of remaining oil prediction by means of well-seismic and borehole-surface seismic integrated description of static reservoir,the possibilities of the surface single seismic interpretations was reduced and the smaller geological units was able to be identified,providing the reliable data for fine development of the oilfield.(3)The DAS joint VSP and 3D surface seismic technology helped Ansai Oilfield increase its geological reserve and effectively raised the production by adjusting the measures for tapping the potential of the low-yield and low-efficiency well patterns.The study indicates that the DAS joint VSP and 3D surface seismic technology is an effective technological method to improve characterization of micro structure and the accuracy of reservoir and fluid prediction in the oilfield development process.This technology can help geophysical technology extend into oilfield development and develop towards borehole-surface seismic stereoscopic exploration,providing support for old oilfields to increase production and efficiency and accelerate high-efficiency development.
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