1 88 



NOETLING: PETROLEUM IN BURMA. 



Much more important is the relation between depth and produc- 

 tion, that is to say to investigate the aggregate daily production of the 

 wells belonging to the same class of depth. Such an examination 

 will convey a very good idea as to which of the oil bearing sands 

 chiefly contributes towards the supply of petroleum. 



The following table will show the aggregate daily production of 

 each of the five classes of wells as they were arranged on page 183 :— 



Class. 



Depth. 



1S88. 



1891. 



1893. 



189s. 



I 



Less than 150 feet , , . . 



984 



",384 



1.132 



2,795 



II 



From 151 to 200 feet .... 



2,511 



3,407 



3,093 



6,272 



III 



From zo 1 to 250 feet . . . . 



9,255 



10,497 



13,203 



11,825 



IV 



From 251 to 300 feet .... 



2,754 



2,557 



9,»io 



8,064 



V 



More than 300 feet .... 



365 



70 



... 



745 





Total 



15,869 



17,915 



26,538 



29,701 



Two features are the most striking in the above table the 

 preponderance of the production of the III class wells and the marked 

 increase in the production of the shallower wells in 1895, while 

 that of the deeper ones shows a slight, though noticeable, decrease. 

 As before it will be useful to consider the different classes by them- 

 selves. 



(a) land II class wells. — In 18S8 the aggregate production of 

 these wells amounted to 3,495 viss or 23% or the total, there was a 

 slight rise in 1891, and a distinct decrease in 1893, while in 1895 the 

 production rose to 9,067 viss equal to 35% °f the total production, 

 that is to say, within about ii years the production had more than 

 doubled, and almost trebled as compared with 1888. 



As explained this is chiefly due to the exploitation of the south- 

 western corner of the Twingon oilfield, which had hitherto been 

 scarcely worked, and where the 1st and 2nd sand still contained a good 

 quantity of oil. If it had not been for this the production would most 



( 234 ) 



