METHOD FOR CALCULATING THE ORGANIC CONTENT IN SEDIMENTS FROM RECORDED DATA, WHICH WERE PRODUCED BY DRILL HOLE MEASURING DEVICES.

摘要

The method determines the organic material content of sediments from data recorded in a borehole by at least two logging probes measuring different parameters. …??The two probes are so chosen that one responds to a variation in the water content and the organic material content of rocks in the same direction while the other responds in a very different way to a variation in one or the other of these two constituents. They are also both chosen so that the lines I of constant content of organic material in a diagram with three end-members lie roughly on top of each other when the third end-member is either the water end-member PE or the clay end-member PA. The position of the line I(0%) is determined experimentally and, from this, the content of organic material corresponding to each pair of values of the parameters measured in the borehole is deduced. In a diagram in which the parameters used depend, for example, on the transit time DELTA T of sound in the rock or on the electrical resistivity Rt of the formations, the lines of constant content form a family of parallel lines. …??Application to the study of sedimentary basins. …IMAGE…