74 NOETLING : PETROLEUM IN BURMA. 



75 feet 



grey water sand . 



. 



(3) 



>75 „ 



dark sand . 



• 



(4) 



50 „ 



oil sand with slight show of oil . 



. II. 





15 „ 



blue clay. 







20 „ 



grey water sand .... 



. 



(5) 



40 „ 



blue clay. 







25 ,, 



oil sand with slight show of oil . 



. III. 





25 ». 



blue clay. 







20 „ 



grey water sand . . 



. 



(6) 



30 „ 



tough blue clay. 







30 „ 



white sand , . . • 



. 



(7) 



20 „ 



blue clay. 







10 „ 



black sand * 



. 



(S) 



If we assume that the black sand differs f ina ;he grey sand, and 

 there is no reason for any other conclusion, we u„^ice eight 

 different sands, four of which are water bearing, four apparently dry ; 

 while distributed between these, there are three petroliferous sands. 

 With the exception already mentioned, they are, however, all 

 separated from each other by beds of clay. 



Another feature must be mentioned; there is no doubt that one 

 and the same arenaceous bed has been found to be water bearing in 

 one well, while it was dry in another. It even seems, if I rightly 

 interpret the boring registers, that the first and second oil sands are 

 unproductive at Kodoung, while they certainly contain oil at Twin- 

 gon and Berne. We may even go a step further and say that some 

 of the wells like Nos. 64 and 68 seem to indicate that the same bed, 

 which yields oil elsewhere, contains only water in these wells- 

 The first observation is not easily explained, unless it be by the 

 rise and fall of the ground water. We may suppose that its level 

 rises and sinks, and when it is high, water is found, in one and the 

 same bed, at a higher level than in a well close by, where the same 

 bed is said to contain no water, because the boring was made when 

 ground water stood low. Unfortunately it is not easy to ascertain 

 from the boring registers how far this supposition is borne out 

 by facts, and as eventually the bore must be tubed to shut off 

 the water found, perhaps at a greater depth, it is impossible to say 



( 120 ) 



