Fluid Analysis and Multi-component Geochemical Features in the Depth of Drill Hole WFSD-4

Both in-site real-time fluid analysis and off-site drilling mud analysis were used to detect the multi-components in the depth of drill hole WFSD and the profiles of multi-components in the drilling mud and other media during drilling. Through the comparison of fluid profile in the depth of the drill hole, the underground fluid geochemistry was discussed in the paper. The fluid from deep underground would be kept in the cycling mud during the drilling process. The further study of drilling mud gas, liquid and solid samples would be helpful to the determination of invasion of underground fluids in various ways. At the same time, the real-time fluid analysis during drilling would record the distinct signal change of components in the cycling mud. The lithologic variation of drilling core would easily cause the change of drilling mud gas, especially the change of multi-components in drilling mud gas. The lithologic section of relatively abundant fissures in the drill hole is the interval of greater drilling mud gas change. The indistinct correlation between multi-components of drilling mud gas and lithology of drilling core was comparatively studied, and the result could indicate the exact region and period in which the correlation of drilling fluid and aftershock was stronger, and this could be helpful to achieving the real degree of correlation between drilling fluid and aftershock.