Introdução à Geologia de Reservatórios/ Introduction to Reservoir Geology Exercise 2

Subject: Diagenesis, Catagenesis, and Metagenesis of Organic Matter. Geochemistry of source rocks.

Answers in English or Portuguese language

A. Zonation of thermal maturation

1. Make a short description on the organic zonation of thermal maturation according the Figure 10.1 (Horsfiled & RullKotter, 1994), considering the different features.

2. Chose only ONE of the following subjects:

a. What is a thermal maturity biological marker? Indicate examples of application.

b. What is a thermal maturity molecular parameter? Indicate examples of application.

Introdução à Geologia de Reservatórios/ Introduction to Reservoir Geology Exercise 2

B. Applied source organic geochemistry

Applied organic geochemistry provides the information needed to make maps of the richness, type, and thermal maturity of a source rock. These maps are a necessary step toward determining the stratigraphic and geographic extent of a pod of active source rock in a petroleum system, and they are based on geochemical analyses of rock samples from outcrops and wells that are displayed on logs.

These geochemical well logs are based on Rock-Eval pyrolysis, total organic carbon, vitrinite reflectance, and other rapid, inexpensive "screening" methods. The logs define:

(1) potential, effective, and spent petroleum source rock; (2) thermal maturation gradient, including immature, mature, and postmature zones;(3) in situ and migrated petroleum shows.

Useful geochemical logs require proper sample selection, preparation, analysis, and interpretation. Detailed studies, including oil-source rock correlations by biomarker and supporting techniques, are undertaken on selected samples only after the screening methods are completed.

in Applied Source Rock Geochemistry (Peters & Cassa, 1994)

1. Apply the petroleum geochemistry parameters studied in the class room and the highlighted concepts (Peters & Cassa, 1994) to the study of the San Joaquin Basin Province, California.

a. What kinds of maps are selected in the study?b. What kinds of parameters are related to these maps?c. Make a short comment on to a geochemical map?d. Make the interpretation of the geochemical data in one selected well (Data tables 11.5. 11.6.

11.7)) were a potential source rock has reached the maturity level.

See the document: http://pubs.usgs.gov/pp/pp1713/

Chapter 11 - Source-Rock Geochemistry of the San Joaquin Basin Province, California (Kenneth E. Peters, Leslie B. Magoon, Zenon C. Valin, and Paul G. Lillis)