塔里木盆地英吉苏凹陷中生界油气勘探潜力

塔里木盆地英吉苏凹陷中生界发育有煤系生油岩，其丰度指标与邻区已出油的库车坳陷、吐哈，焉耆盆地有良好可比性，碳质泥岩和煤层中有丰富－较丰富的基质镜质体，树脂体等富氢生烃组分发育。推测侏罗系还有一定范围的开阔水体有机相存在，具备良好的生烃基础。凹陷热演化与吐哈盆地台参１井十分相似，预计在４０００ｍ以下烃源岩已大量成熟，钻井揭示凹陷内中生界有过大规模的油气运移过程，碳同位素分析表明这些油气来自于中生界三

Potential of hydrocarbon Exploration of Mesozoic in Yingjisu Sag Tarim Basin.

The development of coal-series oil source rock is found in Mesozoic of Yingjisu sag, Tarim basin, its abundance can also be well correlated with that of neighbouring producing areas, including Kuche depression, Turpan-Hami basin and Yingjisu basin. There exist abundant or more abundant matrix vitrinites and resinites found in the car-bonaceous mudstone and coal deposit. By inference, there might be a certain organic facies in the open waters in Juras-sic, providing good hydrocarbon source materials. Because of very similar thermal evolution comparing the sag with Well Taican 1, Turpan-Hami basin, it is predicted that a vast body of hydrocarbon source rocks has come Of age. Drilling re-veals that Mesozoic in this sag have ever brought about large-scale processes of petroleum migration. Carbon isotope analysis shows that the oil and gas came from Triassic and Jurassic coal measure strata. In addition, its structural frame-work is similar to that of Turpan and Kuche depression, with multiple sets Of source-reservoir-seal assemblages and good matched relations among the reservoir-forming elements, in time and space sense, and favorable structural highs sur-rounding eastern Yingjisu deep-trough for further petroleum exploration. However, a certain risk should be paid atten-tion to due to a small depth of the Mesozoic for this exploration.