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In the study by Cardenes et al ., RILD developed in three of the 11 (27.2%) patients with CTP class B. Another prospective study reported that five of the 20 (25%) patients with CTP class B experienced ≥ Grade 3 liver enzyme elevation with ascites (nonclassic RILD) after SABR. Culleton et al .
The RILD and RILM curves are characterized by sharp-high amplitude at the top and bottom of the thick layer sand bodies (Figure 4).
Based on the statistics of RILD of sharp-high, middle, and low amplitude of thick layer sand bodies from ten oil tests and production wells, the average RILD of sharp-high amplitude ranges within 7.4 [OMEGA] x m~26.4 [OMEGA] x m with maximum distributed within 9.1 [OMEGA] x m~30.3 [OMEGA] x m.
Because the sharp-high, middle, and low amplitude curve types are all based on the comparison of the RILD to that of the adjacent sandstone section, two new parameters, JRT and JAC, were constructed to characterize the relative variability.
JRT is relative resistivity, dimensionless; [RILD.sub.max] is maximum RILD of sandstone section in the adjacent sharp-high amplitude, [OMEGA] x m; [RILD.sub.ave] is average RILD of sandstone section in the sharp-high, middle, and low amplitude, [OMEGA] x m; JAC is relative acoustic, dimensionless; [AC.sub.min] is minimum AC of sandstone section in the adjacent sharp-high amplitude, [micro]s/m; [AC.sub.ave] is average AC of sandstone section in the sharp-high, middle, and low amplitude, [micro]s/m; JRT and JAC were calculated according to (1) for sharp-high, middle, and low amplitude of sandstone section (Table 1).
Based on the statistics of the RILD of middle and low amplitude of thick sandstone in ten oil test and production well, the average RILD in the middle amplitude sandstone section is between 7.5 Q-m and 14.1 Q-m, while in the low amplitude sandstone section it is between 4.4 [OMEGA] x m and 10 [OMEGA] x m (Table 1), leading to a significant overlap for the RILD of middle and low amplitude sandstone in the range of 7.5 [OMEGA] x m ~10 [OMEGA] x m; this makes it hard to identify the oil and water layer with only RILD.
The data from eleven test and production wells in the study area show that the average RILM is greater than the average RILD in water layer sandstone (Table 2), such as in H15 (Figure 4(a)) and H24 (Figure 4(c)).
A new parameter [DELTA]RT is constructed based on the characteristics of RILD and RILM, which is the average RILD minus the average RILM.
Based on the statistical results of resistivity of the test and the production data (Table 2), the RILD and RILM cross plot is regarded as a standard resistivity identification method to distinguish oil-water layer from water layer, whereas the average value of RILM is difficult to distinguish the oil-water layer from water layer (Figure 10).
Based on the deduction of the sharp-high amplitude calcareous interlayers, the fluid identification standard of thick layer sand bodies is as follows: (1) if the sandstone is low amplitude type and [DELTA]RT (RILD-RILM) < 0, it is water layer; (2) if the sandstone is middle amplitude type, the average RILD < 10.4 Q-m, and [DELTA]RT (RILD-RILM) < 0, it is water layer; (3) if the sandstone is middle amplitude type, the average RILD > 10.4 Q-m, and [DELTA]RT (RILD-RILM) > 0, it is oil-water layer.
For middle amplitude sandstone, if the average RILD < 10.4 [OMEGA] x m and ART (RILD-RILM) < 0, it is water layer; while if the average RILD > 10.4 [OMEGA] x m and ART (RILD-RILM) > 0, it should be oil-water layer.
GR means natural gamma ray logging, RILD means deep induction logging resistivity, RILM means medium induction logging resistivity, and AC means acoustic logging.
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