Exxon Mobil has signaled a significant decline in its third-quarter oil and gas earnings due to falling oil prices and refining margins. The energy major indicated in a regulatory filing that changes in oil prices would reduce its upstream earnings by $600 million to $1 billion. Additionally, Exxon stated that lower oil prices and refining margins have reduced its third-quarter earnings by $1.6 billion compared to the previous period. This decline in earnings comes amid a broader trend of falling energy prices, which is also putting pressure on big oil payouts.