http://www.scribd.com/doc/11376482/Basic-Petroleum-Geology-BOOK-by-HALLIBURTON
http://books.google.co.uk/books?id=D4I-G0DcTcUC&printsec=frontcover#v=onepage&q&f=false
http://www.metu.edu.tr/~kok/pete424/PETE424_CHAPTER8.pdf
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http://www.scribd.com/doc/11376482/Basic-Petroleum-Geology-BOOK-by-HALLIBURTON
http://books.google.co.uk/books?id=D4I-G0DcTcUC&printsec=frontcover#v=onepage&q&f=false
http://www.metu.edu.tr/~kok/pete424/PETE424_CHAPTER8.pdf