塔里木盆地具有地温梯度低和油气藏埋藏深度大的特点，深埋引起的高压利于油藏保存，７０００ｍ的地层温度＜１６５℃，低于通常认为石油形成温度上限，油藏保存的深可以达到７０００ｍ。铁岭灰岩高温高压模拟实验表明，高压抑制油向气转化。塔里木盆地古生界海相碳酸盐岩晚期二次生烃使生油窗延伸至Ｒｏ１．５％ The Tarim Basin has the characteristics of low geothermal gradient and large buried depth of oil and gas reservoirs. The high pressure caused by deep burdens is favorable for reservoir preservation. The stratum temperature of 7000m <165 ℃ is lower than the upper limit of oil formation temperature generally considered, and the depth of reservoir preservation can reach 7000m . High temperature and high pressure simulation experiments in Tieling limestone show that high pressure suppresses the conversion of oil to gas. Later Paleozoic marine carbonate in the Tarim Basin secondary hydrocarbon generation extends the oil window to Ro1.5%