A junior oil and gas producer will headline a new well with its initial production rate — the IP, often quoted as a 24-hour or 30-day flow in barrels of oil equivalent per day. It is the most exciting number and the least durable. Unconventional wells in particular decline steeply after the first months, so a big IP rate says more about the completion than about how much the well will ultimately produce.
The figure that matters is the decline curve: how quickly production falls from that initial rate toward a long, low tail. Two wells with identical IP rates can have very different economics if one holds its rate and the other halves within a year. A company that shows you type curves and cumulative production is being more honest than one that only trumpets day-one flow.
On the reserves side, apply the same discipline as in mining. Reserve reports rest on price assumptions and recovery factors, and proved-plus-probable bookings carry more uncertainty than proved alone. An IP rate sells the story; the decline curve and the reserve assumptions tell you whether there is one.