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首页> 外文期刊>Marine and Petroleum Geology >The biogenic gas potential of the submarine canyon systems of Plio-Peistocene foreland Basin, southwestern Taiwan
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The biogenic gas potential of the submarine canyon systems of Plio-Peistocene foreland Basin, southwestern Taiwan

机译：台湾西南部上新世前陆盆地海底峡谷系统的生物成气潜力

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摘要

Biogenic gas was accidentally discovered and produced from the Plio/Pleistocene formation of the Hsi-nying gas field in southwestern Taiwan in 1989. A stratigraphic trapping mechanism related to the evolution of submarine canyon systems in the Plio-Peistocene foreland basin has been proposed in a previous study which explained underestimated recoverable gas reserve before drilling. To verify this shallow gas exploration hypothesis and to systematically evaluate the biogenic gas generation and entrapment potential of the submarine canyon systems, seismic interpretation, high-resolution sequence stratigraphic interpretation, seismic attribute analysis and geochemical analysis were performed and integrated in this study. Twenty-nine submarine canyons mapped mainly trend in a NE direction, except the NW trending Eurchungchi submarine canyons located near the Chiali paleo-high. Bright seismic amplitudes were often observed at the incised valley heads of the canyon systems. The shales located near the incised valley heads and deposited during flooding stage possess the highest biogenic gas generation potential, as canyon fill reveals the second highest. Due to the high sediment accumulation rate in the foreland basin, organic matter in such a depositional environment tends to become diluted. A Class III AVO anomaly, inverted impedance lower than 4.7 e + 6 kg/M~3*M/S and A/B (the ratio between the target horizon amplitude and the RMS amplitude from the background strata) greater than 1.78 were identified as valid direct gas indicators as sand is buried shallower than 1000 m. Class IV AVO anomaly and A/B greater than 1.4 were concluded to be the indicators of gas sand in the case that sand is buried deeper than 1600 m. Based on the results of sequence stratigraphic interpretation and the consistency between spatial geometries of seismic attributes and those of the submarine canyons, a stratigraphic trap associated with the incised valley heads was concluded to be the original gas entrapment style of the Hsinying and the Kuantian gas fields. Biogenic gas migrated after being trapped startigraphically, hence contributing to the present-day gas field structure. Due to the prevalent erosional features of the submarine canyons on the time structural maps, different types of stratigraphic traps formed in combination with faults and submarine canyons can be recognized easily.
机译：1989年从台湾西南部西宁气田的上新世/上新世形成中偶然发现并产生了生物气。先前的研究解释了钻井之前可低估的可采储量。为了验证这一浅层天然气勘探假设并系统地评估海底峡谷系统的生物成因气和蕴藏潜力，本研究进行了地震解释，高分辨率层序地层解释，地震属性分析和地球化学分析，并进行了整合。除位于基阿里古高附近的西北偏东风的Eurchungchi海底峡谷外，二十九个海底峡谷的地图主要呈东北方向。通常在峡谷系统的切开的谷头处观察到明亮的地震振幅。位于峡谷谷头附近并在洪水期间沉积的页岩具有最高的生物成气潜力，因为峡谷填充显示出第二高的潜力。由于前陆盆地中沉积物的高沉积速率，在这种沉积环境中有机物趋于被稀释。识别出III类AVO异常，反向阻抗低于4.7 e + 6 kg / M〜3 * M / S和A / B（目标水平振幅与来自背景地层的RMS振幅之比）大于1.78。有效的直接气体指示器，因为沙子被埋在1000 m以下。在砂埋深超过1600 m的情况下，得出IV类AVO异常和A / B大于1.4的结论是气砂的指标。根据层序地层解释的结果，以及地震属性与海底峡谷的空间几何形状之间的一致性，推断与切开的谷头相关的地层圈闭是新营气田和关丹气田的原始气藏形式。生物气在被捕集到地层之后就迁移了，因此有助于当今的气田结构。由于海底峡谷在时间结构图上普遍存在侵蚀特征，因此可以容易地识别出与断层和海底峡谷结合形成的不同类型的地层圈闭。

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