论文部分内容阅读
本文主要阐述了形成深部油气藏的三个因素:即Ⅰ型干酪根在高成熟阶段具有一定的生烃潜力;碳酸盐岩生油岩的成熟作用慢于泥岩生油岩,晶包有机质转化及释放烃类是在高成熟阶段,碳酸盐岩生油岩生油下限的R。值在1.5％以下,液态窗的深度比泥岩大500～1000m;较高的压力是形成深部油藏的另一个重要因素。生油岩的高压生烃模拟实验揭示了高压可以使生油期滞后及提高产油率。地温梯度较低的塔里木、准噶尔盆地腹部,由于压力较高,生油的下限可达7000m。在快速沉降的新生代盆地,由于泥岩快速生油而又难以排放,形成局部异常高压带。异常高压区生油的深度可以向下延伸1000多米,封隔层之下的高压区是深部形成大规模油气藏的广阔场所。
This paper mainly elaborates three factors of forming deep reservoirs: type I kerogen has some potential for hydrocarbon generation in high maturity stage; carbonate matured oil is slower than mudstone source rock, Hydrocarbon release is at a high maturity stage, with carbonate lower limit R. Below 1.5%, liquid depths are 500-1000 m greater than mudslides; higher pressures are another important factor in the formation of deep reservoirs. High-pressure hydrocarbon generation simulation of source rock revealed that high pressure can delay oil production and increase oil yield. Low temperature gradient Tarim, Junggar basin abdomen, due to the higher pressure, the lower limit of oil up to 7000m. In the rapidly subsided Cenozoic basins, the local anomalous high-pressure zone is formed due to the fast oil generation of mudstone and the difficulty of discharging. The depth of oil in the abnormal high pressure zone can extend downwards more than 1000 meters. The high pressure zone under the packer is a vast place for the deep formation of large-scale oil and gas reservoirs.