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塔里木盆地的喀什凹陷及叶城凹陷,是以新生界为主、包括中生界及古生界的两个沉积凹陷。面积约8万平方公里,沉积岩累计厚度超过15000米。其中有石炭—二叠系、上白垩—下第三系两套海相生油层;以及侏罗系陆相生油层。这3套生油层一般埋藏深度是5000～8000米。由于本区地温梯度较低(1.7～2.1℃/100米),生油层埋深在4000～5000米才开始生油,多处于高成熟阶段。事实证明,盆地西南部不但在4000米以
The Kashgar depression and the Yecheng depression in the Tarim Basin are dominated by the Cenozoic and include two depositional depressions of Mesozoic and Paleozoic. An area of about 80,000 square kilometers, sedimentary rock total thickness of more than 15,000 meters. Among these are the Carboniferous-Permian, upper Cretaceous-Lower Tertiary two marine-derived reservoirs, and the Jurassic terrestrial oil-bearing reservoirs. These 3 sets of oil reservoirs are generally buried depth of 5000 to 8000 meters. Due to the low geothermal gradient in this area (1.7-2.1 ℃ / 100m), the oil generation depth is between 4,000 and 5,000 meters before it begins to generate oil, mostly in the high mature stage. Facts have proved that not only in the basin southwest of 4000 meters