36 The Philippine Journal of Science 1922 
and their areal distribution it appears probable that Malitabug 
River is located along a fault line. In fig. 3 is shown a gener- 
alized cross-section suggesting the geological relationships in 
this region. 
ECONOMIC 
Description of seep—The only indication of petroleum in this 
field is a single seep, and a very small one at that, which is located 
in a ravine on the headwaters of Kirusoy Creek, a tributary of 
Malitabug River. This is well up the side of a partially wooded 
range of igneous rock, and on the south side of what appears 
to be an east—west dike running from the main mass. 
The amount of oil and gas issuing at this point is very small; 
compared with other seeps in the Philippines and elsewhere, 
it is not very encouraging. It is said that a 5-gallon can of 
this oil can be collected in a day from this seep. The writer 
doubts this. In Table 2 is presented the analysis of this oil 
made by chemists of the Bureau of Science and, in Table 3, an- 
River 
_---- Fault @) 
g 
------ Banisilan 
eae 
Freshwater shales _—— 
= and sandstones —— 
= 0 
Loot Malitabu, 
age a a 
x\ “SYigo shalés 7 7 
* *, and sandstones < 
cs) 
x x QOS s 
yo ate a 
5 core fERE es 
Per aa + natty ZZ eis 
+ hae +x 
x 
xs 
Fic. 8. Generalized cross-section east and west through Pidatan oil seep. 
other analysis, by Mr. Winkler, chemist for the United States 
Army Quartermaster, Manila. Accompanying the analysis by 
Mr. Winkler, is a memorandum relative to the possible uses for 
this oil. It will be noticed that this oil has neither “head” nor 
“tail;” that is to say, the light fractions such as gasoline, benzene, 
and kerosene are absent, and it has only from 1 to 2 per cent of 
wax, or paraffin, residuum. This indicates that the oil is ab- 
normal and has lost some of its constituents in migration. 
Therefore, it is presumed that either the oil has come from a 
considerable distance through the formations or it has suffered 
distillation locally, due either to the heat of cooling igneous rocks 
or to heat generated during metamorphism. In the parlance 
of the practical oil man this is a “wild” oil. 
