Research on high precision 3D observation system for clastic rocks based on inversion technology
Tabei area of Tarim Basin is rich in oil and gas resources of clastic rocks,which is one of the essential exploration fields.With the deepening of oil and gas development in clastic rocks,low-density 3D seismic data can no longer meet the high-precision characterization requirements of reservoirs such as thin sandstone in clastic rocks in the past.It is urgent to carry out research on high-precision 3D seismic acquisition methods that meet the needs of clastic rock development.Based on the 3D seismic acquisition data of Yudong Block in Tabei,the constrained sparse pulse inversion method was optimized.Based on wave impedance inversion data,the observation system parameters were researched to improve the accuracy of sand body characterization.The results indicated that the weak reflection of sandstone,which is not significantly contrasted on the seismic profile,has significant differences in wave impedance inversion data,enriching the evaluation and optimization methods for seismic acquisition of clastic rocks.It has been preliminarily clarified that the priority order for selecting observation system parameters is channel density,bin,receiving line distance,observation width,and coverage frequency.According to current high-density acquisition experience in terms of explosive source,it is recommended to reach a trace density of about 1.7 million,with a smaller bin of 15 m× 15 m,with a receiving line distance of about 210 m,and an aspect ratio of 0.7 or more for azimuth observation,The research results provide an effective technical reference for the research and parameter design of high precision three-dimensional seismic acquisition and observation system of clastic rock.
万方数据
维普
