Granularity of Terrigenous Clastic Rock Using Sieving Method and Laser Particle Size
YOU Fan1,GENG Xiang2
1. Beijing Geoscience and Resource School of China University of Geosciences, Beijing 100083, China
2. Yumen Oilfield Exploration and Development Reaearch Institute, Jiuquan, Gansu 735019, China
Abstract：The particle size of the terrigenous clastic rocks is determined by the combination of the sieving method and the laser particle size method, in order to ensure the concerted synergy between the sieve method and the laser particle size method, the analytical data of the laser particle size method is corrected, comparing the probability cumulative frequency curve of sediment rocks before correction and after correction in different geological ages, it is found that the corrected curve can make better characterize the particle size distribution of terrigenous clastic rock. The L9 (34) orthogonal optimization scheme is carried out for the three factorsof the sampler stirring speed (A), pump speed (B) and ultrasonic intensity (C) which influenced the background measurement of the Malvern MS 2000 laser particle size analyzer, The optimal measurement conditions are: A is 600r/min, B is 2000r/min, which makes the background measurement stable, and concluding that the influence degree on the background measurement can be expressed by B>A>error>C. The particle size standard curve is calibrated with 9 reference materials, the residual error between the standard curve of the particle size and the standard curve of instrument was small, ranging from 0.795% to 2.934%, the relative standard deviation is between 0.24% and 0.33%. This method is suitable for the particle size analysis of terrestrial clastic rocks in various geological ages.
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2021, Vol. 42 
