Petroleum geology is that the study of origin, occurrence, movement, accumulation, and exploration of hydrocarbon fuels. It refers to the precise set of geological disciplines that are applied to the look for hydrocarbons (oil exploration) A oil geologist is an earth scientist who works within the field of economic geology, which involves all aspects of oil discovery and production. Petroleum geologists are usually linked to the particular discovery of oil and therefore the identification of possible oil deposits or leads.A fuel , petroleum is made when large quantities of dead organisms, mostly zooplankton and algae, are buried underneath rock and subjected to both intense heat and pressure. Petroleum has mostly been recovered by oil drilling (natural petroleum springs are rare).Geology, Shale Gas] A depression within the crust of the world , caused by plate tectonic activity and subsidence, during which sediments accumulate. A career in geology often involves travel. Petroleum geologists may conduct explorations to locate gas and oil deposits, securing samples as they are going . Engineering geologists may have to go to proposed sites for dams or highways to work out the project's geological feasibility. Crude oil may be a mixture of hydrocarbons that exists as a liquid in underground geologic formations and remains a liquid when delivered to the surface. ... Petroleum may be a broad category that has both petroleum and petroleum products. The terms oil and petroleum are sometimes used interchangeably. Coal, gas , and petroleum are all fossil fuels that formed under similar conditions. Today, petroleum is found in vast underground reservoirs where ancient seas were located. Petroleum reservoirs are often found beneath land or the ocean bottom . Their petroleum is extracted with giant drilling machinesPetroleum may be a present complex mixture made up predominantly of carbon and hydrogen compounds, but also frequently containing significant amounts of nitrogen, sulfur, and oxygen along side smaller amounts of nickel, vanadium, and other elements.