102 NOETLING: PETROLEUM IN BURMA. 



may have existed between B and B' while there was none between 

 B' and B", beds in B and B' may therefore exhibit a certain similarity, 

 while there is a vast difference between the physical nature of the 

 beds in B' and B". It is also very probable, that towards the 

 heads of the basins, where they were sufficiently separated, the 

 sequence of the series varied considerably in adjoining basins, while 

 further towards the end where the separating ridge (b) becomes 

 lower the beds join and assume a more uniform character. 



It will be seen that the above theory will allow for an enormous 

 variety of details in the deposit, which can be multiplied to any 

 degree if we take into account the contemporaneous erosion, which 

 has been repeatedly proved. 



Now I must confess, that when looked at from the points of view 

 of this theory the sections of the deep boring appeared in quite a 

 new light. Certain anomalies, as for instance in section V, the rapid 

 change of a bed of clay of 201 feet thickness in No. u, into a sandy 

 layer of 212 feet thickness in No. 10, were easily explained by the 

 above theory ; No. 11 is situated at one and No. 10 at the other side 

 of the central basin, hence the difference of the physical nature of 

 the sediments within so short a compass. 



We are, however, in a position to test the correctness of the above 

 theory by the comparison of the boring registers, but then we must 

 at once dispose with the orthodox method of simple sections across 

 the strike, and we will have to arrange the sections in such a way 

 as required by the above theory, that is to say, quite irrespective of 

 the present direction of dip and strike. 



It is one postulate of the above theory that the rich wells ought 

 to be situated along the direction of the central ridge and not on its 

 lateral off-shoots, occupying generally the highest points. We should 

 therefore observe a rise of the petroliferous beds, from the wells of 

 lower production towards those of the higher. 



Another postulate would be that within the area supposed to be 

 occupied by the basins we should observe a slope of the beds towards 

 the centre of such basins. 



( us ) 



