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ID: 803116 • Letter: T
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3 3.1 In the log example of Fig. 3.12, indicate the shale baseline and zone the log into three major units; label the shale and the two reservoir units Assuming that the lower reservoir is water-filled, answer the following questions 3.1.1 Is the mud filtrate more or less saline than the formation water? 3.1.2 On the basis of the resistivity curves alone, the upper oir may be split n the basis of the resistivity curves alone, the upper reservoir may be split into two portions. Do they both contain hydrocarbons? Why? 3.1.3 Which of the two zones do you expect to be more permeable?Explanation / Answer
3.1. can be classified into three formations:
first resevoir unit: 9320m- 9390m
Shale unit: 9390m- 9410m
Second reservoir unit: 9410m- 9490m
3.1.1. In SP log it should be well understood that if the difference between the salinities of mud filtrate and the formation fluid is nearly zero, then the deviation reflected in log is also zero. A positive deviation is obtained at zone of 9390m- 9410m with the symmetry gamma ray log. Thus, the reservoir formation or formation fluid is more saline than the mud filtrate.
3.1.2. At interface of 9360m we can infer that it may be divided into to sub sections. The probability of finding the hydrocarbon is less because the resistivity alue is quite low and doesnot meet the resistivity of HC. Lower subsection has higher possiblity then the above one.
3.1.3. zone between 9370-9380m and at the top of the log are the zones where the connecting porosity is maximum. It is referred in the porosity logs . SP log can also help in to estimate the extent of permeability in these zones.
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