Duties and Reports of the Subsurface Geologist 851 



Figure 5. South stratigraphic cross section : Dinwoody, Embar, Tensleep, Ams- 

 den zones. 



Figure 6. Structure map of Oregon Basin, Wyoming; contours on Embar lime- 

 stone. 



Figure 7. West-east structural cross section; south dome Oregon Basin. 



MENE GRANDE OIL COMPANY 



Oil Fields of Greater Oficina Area, Central Anzoategui, Venezuela'^ 

 H. d. hedberg, gulf oil corporation, and l. c. sass and h. j. funkhouser. 

 Abstract 

 Introduction 

 Major features 



Acreage ownership and nomenclature of districts, fields, and wells 

 Discovery 



History of exploration and development 

 Surface features 

 Physiography 

 Geography 



Areal geology and vegetation 

 Surface indications of oil and gas 

 Stratigraphy 

 Regional 



Mesaverde formation 

 Sacacual group 

 Freites formation 

 Oficina formation 

 Temblador formation 

 Basement 

 Correlation 

 Structure 

 Geologic history 

 Oil and gas reservoirs 

 Reservoir pressures 

 Reservoir temperatures 

 Reservoir fluids 

 Oils 



Formation waters 

 Notes on origin, migration, and accumulation of oil 

 Drilling and completion practice 

 Production 



Production practices 

 Production data 

 Production processes 



Pressure maintenance and secondary recovery 

 Outlet 

 Summary of principal features of individual fields 



Regional Reports 



Cambrian and Ordovician Rocks in Michigan Basin and 

 Adjoining Areas " 



george v. cohee, united states geological survey 

 Abstract 

 Introduction 

 Pre-Cambrian rocks 

 Cambrian rocks 

 Lower Ordovician rocks 

 Middle Ordovician rocks 

 Upper Ordovician rocks 



"Am. Assoc. Petroleum Geologists Bull., vol. 31, no. 12, pp. 2089-2169, Dec. 1947. 

 ^' Am. Assoc. Petroleum Geologists Bull., vol. 32, no. 8, pp. 1417-1448, Aug. 1948. 



