1. Basic Characteristics of Oil, Natural Gas, and Oilfield Water

This chapter delves into the fundamental characteristics of oil, natural gas, and oilfield water, focusing on the chemical composition and physical properties of oil. It explores the elemental composition of oil, highlighting the dominance of carbon and hydrogen, and the presence of sulfur, nitrogen, and oxygen. The text also examines the compound composition of oil, including hydrocarbons such as alkanes, cycloalkanes, and aromatic hydrocarbons, as well as non-hydrocarbon compounds like sulphocompounds, nitrogenous compounds, and oxy-compounds. The chapter discusses the fractional and group composition of oil, and the geochemical classification of oil based on its composition. Furthermore, it explores the physical properties of oil, including color, density, viscosity, solubility, fluorescence, optical activity, pour point, wax content, and heating value. The text also provides an overview of heavy oil and bitumen, their chemical composition, and their significance in the global energy landscape. By understanding these characteristics, professionals can gain insights into the generation, migration, accumulation, and distribution patterns of oil, which are crucial for formulating development and processing plans, and evaluating the quality of oil products.