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首页> 外文期刊>Australian Journal of Earth Sciences >Gas generation and expulsion characteristics of Middle-Upper Triassic source rocks, eastern Kuqa Depression, Tarim Basin, China: implications for shale gas resource potential
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Gas generation and expulsion characteristics of Middle-Upper Triassic source rocks, eastern Kuqa Depression, Tarim Basin, China: implications for shale gas resource potential

机译：塔里木盆地库车eastern陷东部中上三叠统烃源岩产气与排采特征：对页岩气资源潜力的启示

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摘要

Frontier exploration in the Kuqa Depression, western China, has identified the continuous tight-sand gas accumulation in the Lower Cretaceous and Lower Jurassic as a major unconventional gas pool. However, assessment of the shale gas resource in the Kuqa Depression is new. The shale succession in the Middle-Upper Triassic comprises the Taliqike Formation (T_3t), the Huangshanjie Formation (T3_h) and the middle-upper Karamay Formation (T_(2-3)k), with an average accumulated thickness of 260 m. The high-quality shale is dominated by type III kerogen with high maturity and an average original total organic carbon (TOC) of about 2.68 wt%. An improved hydrocarbon generation and expulsion model was applied to this self-contained source-reservoir system to reveal the gas generation and expulsion (intensity, efficiency and volume) characteristics of Middle-Upper Triassic source rocks. The maximum volume of shale gas in the source rocks was obtained by determining the difference between generation and expulsion volumes. The results indicate that source rocks reached the hydrocarbon expulsion threshold of 1.1% VR and the hydrocarbon generation and expulsion reached their peak at 1.0% VR and 1.28% VR, with the maximum rate of 56 mg HC/0.1% TOC and 62.8 mg HC/0.1% TOC, respectively. The volumes of gas generation and expulsion from Middle-Upper Triassic source rocks were 12.02 × 10~(12) m~3 and 5.98 × 10~(12) m~3, respectively, with the residual volume of 6.04 × 10~(12) m~3, giving an average gas expulsion efficiency of 44.38% and retention efficiency of 55.62%. Based on the gas generation and expulsion characteristics, the predicted shale gas potential volume is 6.04 × 10~(12) m~3, indicating a significant shale gas resource in the Middle-Upper Triassic in the eastern Kuqa Depression.
机译：在中国西部的库车pression陷进行的前沿勘探已经将下白垩统和下侏罗统中的连续致密砂岩气聚集作为一个主要的非常规气藏。但是，对库车De陷页岩气资源的评估是新的。中上三叠统的页岩层序由塔里奇科组（T_3t），黄山街组（T3_h）和中上克拉玛依组（T_（2-3）k）组成，平均堆积厚度为260 m。优质页岩以成熟度较高的III型干酪根和平均原始总有机碳（TOC）约为2.68 wt％为主导。将一个改进的碳氢化合物生排模型应用到这个独立的油藏系统中，以揭示中上三叠统烃源岩的生气和排烃特征（强度，效率和体积）。通过确定生排量与排出量之间的差，获得源岩中页岩气的最大体积。结果表明，烃源岩的排烃门限达到1.1％VR，出烃和排烃达到峰值，分别为1.0％VR和1.28％VR，最大比率为56 mg HC / 0.1％TOC和62.8 mg HC /。 TOC分别为0.1％。中上三叠统烃源岩生，排气量分别为12.02×10〜（12）m〜3和5.98×10〜（12）m〜3，剩余量为6.04×10〜（12 ）m〜3，平均气体排出效率为44.38％，保留效率为55.62％。根据天然气的产生和排泄特征，预测的页岩气潜在体积为6.04×10〜（12）m〜3，表明库车De陷东部中上三叠统的页岩气资源丰富。

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