3D Seismic Data Acquisition Methods In Block Wudong Of Wuerxun Depression Of Hailaer Basin

The paper is mainly about3D seismic acquisition technology of block WUDONG ofWuerxun depression. Owing to the influence of depression faults, the depth of same formationis changeable a lot, S/N OF seismic data is more different, the faults are complicated and dipangle is big, so there are following obstacles, such as the requisition of high inline andcrossline resolution, acquisition geometry factors and shooting parameters optimizationdifficultly, the environmental noise (mainly wind) influence upon high frequency data. Inorder to acquire total geologic information underground exactly and meet the reservoirrequirement of high resolution survey, this paper analyzes some frequency band of the seismicdata of HAILAR basin shows weak in terms of both surface and deep seismic geologicconditions. First, from the old data, analyzes and summarizes the previous section, shot record,well data, provided a favorable basis for the acquisition system parameters demonstration. Itis demonstrated in detail from acquisition parameters optimization, shooting and receiverparameters, instrument preamplification and operation, and then the effective acquisitionmethods to improve data quality are presented. That is the appropriate charge shooting ongroup, some strings areal array receiving, oblique acquisition system, reasonable factors ofpreamplification and standardization of construction processes. The data S/N and resolutionare improved greatly by above technologies. The T2-2event is continuous well in bandwith60-120Hz seismic section processed on site, T3and T5events are fairly continued inbandwith45-90Hz seismic profile. The author summarized and presented a series of seismicacquisition techniques in grass area of Wudong depression of Hailaer basin, and obtained a setof geology section which folds are uniform, the details of interlayer are clear, energy of deepformation is strong, structures and features are more distinct. Then the article establishedsome procedures about standardized operation in grassland of HAILAER basin. All in all, theseismic acquisition technologies and standardized operation procedures can take guidedeffects in follow-up similar seismic acquisition blocks.