This Third Edition of Elements of Petroleum Geology is completely updated and revised to reflect the vast changes in the field since publication of theSecond Edition. This book is a usefulprimer for geophysicists, geologists, and petroleum engineers in the oil industry who wish to expand their knowledge beyond their specialized area. It is also an excellent introductory text for a university course in petroleum geoscience.Elements of Petroleum Geology begins with an account of the physical and chemical properties of petroleum, reviewing methods of petroleum exploration and production. These methods include drilling, geophysical exploration techniques, wireline logging, and subsurface geological mapping. After describing the temperatures and pressures of the subsurface environment and the hydrodynamics of connate fluids, Selley examines the generation and migration of petroleum, reservoir rocks and trapping mechanisms, and the habit of petroleum in sedimentary basins. The book contains an account of the composition and formation of tar sands and oil shales, and concludes with a brief review of prospect risk analysis, reserve estimation, and other economic topics. Updates theSecond Edition completelyReviews the concepts and methodology of petroleum exploration and productionWritten by a preeminent petroleum geologist and sedimentologist with decades of petroleum exploration in remote corners of the worldContains information pertinent to geophysicists, geologists, and petroleum reservoir engineers New to this Edition: Updated statistics throughoutAdditional figures to illustrate key points and new developmentsNew information on drilling activity and production methods including crude oil, directional drilling, thermal techniques, and gas playsAdded coverage of 3D seismic interpretationNew section on pressure compartmentsNew section on hydrocarbon adsorption and absorption in source rocksCoverage of The Orinoco Heavy Oil Belt of VenezuelaUpdated chapter on unconventional petroleum'