Dwayne Purvis, SPE, is a reservoir consultant, writer, speaker, and trainer based in Texas. He assists operators and investors in making circumspect decisions, especially in hard-to-understand reservoirs and complex situations. With more than 25 years of practice in multiple leadership roles, Purvis has studied scores of fields and advised clients of all sizes. He graduated from Texas A&M University, is a member of AAPG, SEG, and SPEE, and is a 25-year member of SPE. He can be reached at dpurvis@dpurvisPE.com.