X, A, 4 



Pratt: Petroleum in the Province of Cebu 



283 



well over which the derrick stands is evidently the deeper of 

 the two. Three strings of casing, 12 inches (30 centimeters), 

 8 inches (20 centimeters), and 6 inches (15 centimeters) in 

 diameter, respectively, are visible at the collar. Petroleum 

 stands in the well at a level but little lower than that of the 

 ground surface. The petroleum is buoyed up by a column of 

 water below it, and probably fills only a short length of the 

 casing, but enough is present to permit the collection of a 

 dozen or more liters at any time. The other well, 50 meters 

 distant, is cased with 8-inch (20-centimeter) pipe and yields 

 oil in a similar manner and quantity. 



A sample of petroleum was collected from one of these wells 

 in 1913 and brought to Manila for testing. Mr, F. R. Ycasiano, 

 assistant engineer of the Bureau of Science, conducted 4-hour 

 test runs with a Diesel motor, using the Toledo, Cebu, and 

 Borneo crude oils in alternate tests. The Cebu oil proved to 

 be a highly desirable fuel and somewhat superior to the Borneo 

 oil. 



Table I shows the specific gravities and percentage yields 

 of the distillation products from Toledo, Cebu, crude petroleum. 



Table I. — Distillation products from Toledo, Cebu, crude petroleum^ 



Product. 



Specific 

 gravity 

 at 15° C. 



Volume. 



Distilla- 

 tion tem- 

 perature. 



Crude 



0.885 

 0.762 

 0.832 

 0.901 



Per cent. 



"C. 





6.2 

 42.32 

 38.3 

 13.17 



to 150 



150-300 



300-375 



375 



Kerosene- 



Heavy oils -. _ - __ _ _ 



Residue _ - - __-_.___ 







" Analysis by H. C. Brill, chemist. Bureau of Science. 



The foregoing analysis shows a much heavier oil than the 

 product obtained from the Bondoc Peninsula field in Tayabas 

 Province, which yields more than 40 per cent of gasoline. 



The geologic structure at the site of the Toledo wells is mono- 

 clinal as shown in fig. 1. The beds lie^ upon the flank of the 

 older igneous complex, which forms the core of the island. 

 The rocks which outcrop at the wells are sandy shales, fine- 

 grained elastics, and sandstones overlying sandy conglomerates, 

 with a general dip to the northwest at an angle of from 50° 

 to 60°. 



A volcanic tuff outcrops just north of the wells on Calaman- 

 pao River and lies stratigraphically above the position of the 



