Abstract
The main targets of seismic exploration research in Leijia carbonatite tight sandstone oil area of Liaohe depression are thin reservoirs prediction and minor faults identification, which is one of the important representatives of complex exploration objects in Liaohe depression. High precision 3D seismic exploration has significantly improved the ability of thin reservoirs prediction and minor faults identification of this area. Reducing the cost of high precision 3D seismic exploration through optimizing the acquisition parameters is very important for the next step exploration and development of Liaohe depression and similar areas. Based on high precision 3D seismic acquisition data in Leijia tight sandstone oil area, multiple sub-geometries are obtained with different bin sizes, different folds, different aspect ratio, different line intervals by extracting receiver points and shot points, and PSTM processing is performed respectively, obtained PSTM datasets of the sub-geometries, extract time slices, amplitude slices along the layer, coherent slices and so on. We evaluate the data results of the sub-geometries from the aspects of signal-to-noise ratio, thin reservoirs resolution, acquisition footprint and so on. Considering the exploration cost and data effect of each sub-geometry, the optimal direction of the main parameters of high precision seismic exploration in Liaohe depression is put forward, and the acquisition effect of adjacent area by the optimized parameters is given.
Highlights
“Two Wide and One High” (Wide azimuth, wide band and high density) seismic exploration technology is a high precision seismic exploration push out for solving complicated area exploration technology in recent years, which has carried out trial in the Caspian Sea region abroad [1], and in Junggar basin, Tarim basin, Liaohe depression of China [2] [3] [4] [5], and achieved good results
Based on high precision 3D seismic acquisition data in Leijia tight sandstone oil area, multiple sub-geometries are obtained with different bin sizes, different folds, different aspect ratio, different line intervals by extracting receiver points and shot points, and PSTM processing is performed respectively, obtained PSTM datasets of the sub-geometries, extract time slices, amplitude slices along the layer, coherent slices and so on
We evaluate the data results of the sub-geometries from the aspects of signalto-noise ratio, thin reservoirs resolution, acquisition footprint and so on
Summary
“Two Wide and One High” (Wide azimuth, wide band and high density) seismic exploration technology is a high precision seismic exploration push out for solving complicated area exploration technology in recent years, which has carried out trial in the Caspian Sea region abroad [1], and in Junggar basin, Tarim basin, Liaohe depression of China [2] [3] [4] [5], and achieved good results. Wei Zhang [10] carried out degradation processing about bin size, the number of shot points and array length from a high resolution acquisition data from Junggar basin of western China, to evaluate the impact of these parameters on the final stack profile. Based on the high precision 3D data of Leijia area in Liaohe depression of Bohai Bay Basin, this paper carried out degradation processing such as bin size, fold, aspect ratio, line interval, etc, systematically compared the difference of signal to noise ratio, thin layer imaging, fault imaging, data continuity caused by the geometry parameter variations from prestack time migration profile, time slice, amplitude slices along the layer, coherence slices, etc., put forward the optimization direction of high precision seismic exploration key acquisition parameters in Liaohe depression, provides the guidance for the optimization of high precision seismic acquisition in Bohai Bay Basin similar regions
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