OUTLINE FOR REPORT ON PETROLIFEROUS PROVINCE 



I. Introduction 



1. Importance today and in earlier history. 



2. Location and boundaries. Illustrate with map showing location of productive 

 areas and names of more important fields. Give states involved and relative 

 importance of each. 



3. Subprovinces if any. 



4. Date of discovery and history of development. Most active areas at present. 



5. Unusual characteristics in the geology and in the occurrence of oil and gas. 



6. Surface indications of oil and gas. 



II. Geomorphology and general geology 



General statement regarding physiography, range in age of rocks, thickness of 

 strata, regional and local structure and their influence on topography, igneous 

 activity, extent of exposures, explanation of techniques best adapted to area. 



III. Stratigraphy 



1. Thickness, character, age, and distribution of the rocks. 



2. Stratigraphic table or, preferably, columnar section or sections. 



3. Description of surface and subsurface formations by systems. Correlation chart. 



4. Lateral variations in thickness and character (facies changes) , sources of 

 sediments, shifting of axis of geosyncline of deposition, old shore lines. 



5. Unconformities, wedge areas, overlap and offlap relations, buried topographic 

 features, etc. 



6. Key horizons. 



7. Methods of subsurface correlation. 



8. Producing horizons, continuity, lithologic character. 



IV. Structure 



1. Description of surface and subsurface regional structure and relation to other 

 major tectonic features, rate of dip, age and origin, etc. (use structure contour 

 map or maps and cross sections). 



2. Influence on distribution of formations. 



3. Modifying structural features (including faults and buried hills and ridges) ; 

 nature, size, and amount of closure (if any) ; and trends. 



4. Changes in structure with depth, times of subsidiary folding and faulting, and 

 modification of earlier structures by later deformation. Isopach maps. 



5. Brief statement regarding relation of production to regional and local structures. 



V. Paleogeology 



1. Geologic history of area. Influence on sedimentation. Evolution of present 

 structure. Subsurface areal and structure maps below unconformities con- 

 trasted with surface-geology maps. 



2. Times of igneous activity. Types and distribution of intrusion and extrusion. 



3. Degree of metamorphism of various horizons. 



VI. Occurrence of oil and gas (if several subprovinces, consider each separately) 



1. Types of traps. Describe each and illustrate by producing fields. Relative 

 importance of each. Relations to structure. 



2. Methods of prospecting. 



3. Barren structures and possible reasons therefor. 



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