Reserch On Seismic Identifying Method Of Complex Reservoir In Hailar Basin

Hailar basin had experienced multiple and strong tectonic reworkings, more over, the multiple provenances, quick facies changes, complicated and variation types of reservoirs, and they are now in the relatively complicated tectonic area, so they are characterized by relatively strong concealment. Presently the major thorny problems encountered in seismic exploration includes the seismic resolution and fidelity can not meet the requirements of lithologic exploration; the precisions of identifying and predicting the channel sand bodies and other sandstone reservoirs in Hailar basin are relatively low; the geological and geophysical response characteristics of fractured reservoirs are still deficient in systematic study. The relatively effective seismic identification methods are now necessary to be studied.According to the actual necessary of exploration in Hailar basin, this paper is targeted to the characteristics of complicated reservoirs which are difficult to predict in Hailar basin, and determining the following research ideas, i.e. to start with the basic and regional geologic analyses, fully apply the new principles, new methods and new technologies in reservoir prediction and seismic inversion, and take the seismic identification method of complicated reservoirs as the motif. The complicated reservoir characteristics are firstly analyzed, and then make a research on the high frequency and fidelity processing technologies, maximumly improving the resolution and fidelity of seismic data and laying the base for seismic identification of sandstone reservoirs; secondly make a research on the azimuthally processing technology, preparing the data for seismic pre-stack inversion; thirdly applying the seismic attribute analysis and seismic inversion methods to identify the channel sand bodies; according to the ideas from macroscopic to microscopic, from qualitative to quantitative, applying the post-stack fracture-detection and tectonic stress field analysis methods to make the quantitative prediction of the oriented fracture development belt, and summing up the method of identifying fractured reservoirs from seismic data; and finally applying the summarized seismic method of identifying the complicated reservoirs to identify and predict the channel sand bodies and fractured reservoirs in East Urig, South Tamuzag and other 3-D work areas, i.e. preparing the target areas for a further exploration deployment and favorably guiding the production . The major new ideas and achievements are as follows:1. Put forward the pre-stack transmission and absorbing Q compensation method and fidelity-high frequency processing method, effectively expanding the frequency band, so that the major frequency can be raised to 20Hz, and improving the capability of distinguishing channel sandstones.2. Set forth the stochastic simulation seismic inversion method based on the reconstruction of logging sensitive attributes, effectively improving both the vertical and horizontal resolutions of reservoir inversion and the resolution capability of reservoirs in the study area.3. Put forward the comprehensive method of identifying channel sandstones. Applying seismic attribute, frequency division, inversion and waveform cluster analyses to identify the channel sandstones. The boundaries of sandstones distribution areas are clear, and the distribution morphology of channel sands meet the geologic regularity.4. Stress field numerical modeling has firstly been made for qualitatively predicting the developmental belts of tectoclases. The results are similar to those reflected by the structural curvature, maximum principal strain and maximum principle stress, and coincide with the geologic regularity.5. The comprehensive prediction method and processing flow have been formed, and a breakthrough has been made in predicting the fractured reservoirs in East Urig–fracture-developed belts have been identified, and the coincidence rate between the results of fracture prediction and the known wells are relatively high. The research results mentioned above have not only the novelty and creativity, but have also the practicality. This would be the theoretical basis of the further seismic identification of complicated reservoirs in Hailar basin, and would concurrently be of great and realistic significance to increasing both the reserves and production in the area.