## 1 Introduction  
As an efficient oil recovery technology, heavy oil air injection in in situ combustion technology has successfully been commercialized. The United States, Romania, India, and other countries have had very successful heavy oil in situ combustion industrialization projects [1, 2, 3]. China's heavy oil in situ combustion technology is mainly used in heavy oil reservoirs after steam injection. This technology has successfully been applied in heavy oil reservoirs such as the Hongqian 1 block in the Xinjiang Oilfield and the Du 66 block in the Liaohe Oilfield [4]. Air injection in light oil reservoirs is generally used in deep, low-permeability reservoirs. The air injection pressure is higher, the matching process requirements are more stringent, and the mechanism of enhanced oil recovery (EOR) is more complicated. The Buffalo oilfield in the United States has carried out high-pressure air injection (HPAI) field tests in low-permeability, light oil reservoirs for many years. The coring data after air injection show that core oil displacement efficiency is more than 90%, which is much higher than that of conventional flue gas flooding, proving the great potential of light oil air injection development [2]. Domestic and foreign scholars have performed much research on types of air injection oxidation reactions, low-temperature oxidation characteristics, and flue gas displacement in light oil reservoirs [5; 6; 7; 8; 9; 10; 11; 12; 13; 14; 15; 16]. International scholars have studied the oxygen consumption rate, displacement efficiency, oxidation heat release, and spontaneous combustion possibility of air injection in light oil. In most experiments, the oxygen consumption rate can essentially reach 100%, and 9% carbon dioxide and 1% carbon monoxide are produced. At the same time, air injection can significantly improve oil recovery [13]. The crude oil involved in this reaction is divided into three parts: C\({}_{5}\)-C\({}_{20}\), C\({}_{21}\)-C\({}_{30}\), and coke. The mutual restriction and mutual transformation of the oxidation reaction of these three parts determine the exothermic oxidation characteristics of air injection, the change in crude oil properties, and the possibility of spontaneous combustion [14; 15]. Based on high-temperature and high-pressure experiments in a laboratory, the authors' team studied the EOR mechanism and production dynamics of air injection in low-permeability, light oil reservoirs. The high-temperature and high-pressure air injection experiments in the laboratory confirmed that light oil could consume oxygen efficiently. During the air injection process, a stable thermal oxidation front of 220-450 \({}^{\circ}\)C is formed, which continuously transfers heat and drives energy forward, greatly improving oil displacement efficiency under the action of high-temperature distillation phase transition. Oil displacement efficiency was more than 90%, which could aid in the efficient development of light oil reservoirs. On this basis, the concept of 'thermal-assisted miscible' was proposed [6]. In another study, the thermal miscible mechanism and law of flue gas and light oil under thermal-assisted conditions were clarified through a high-temperature and high-pressure, slender-tube miscible experiment, and it was confirmed that the thermal effect was the main mechanism behind the efficient development of air injection in light oil reservoirs [7]. The authors' team carried out pilot tests of air injection in light oil reservoirs in Jilin, Changqing, and other oilfields, and they achieved preliminary effects. At present, the pilot test of Jilin Moliqing's ultra-low-permeability, light oil reservoir has been running stably for 2 years, and the injection-production relationship is stable. It achieved stable production, increased oil production, and verified the mechanism of light oil, thermal-assisted, miscible-enhanced oil recovery [17]. A light oil reservoir is generally buried deep, and its pressure is high.