Dive into the fundamentals of petrophysics with this comprehensive lecture, the first in a four-part series. Explore the essential concepts and principles that form the foundation of petrophysical analysis in the oil and gas industry. Learn about rock properties, fluid behavior in porous media, and the techniques used to evaluate reservoir characteristics. Gain valuable insights into the role of petrophysics in hydrocarbon exploration and production, and understand how this discipline integrates with other geoscience and engineering fields. Enhance your knowledge of the tools and methods employed in petrophysical evaluation, including well logging techniques and core analysis. Ideal for students, early-career professionals, and anyone seeking a solid introduction to this crucial aspect of petroleum geology and engineering.