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Real-time drilling mud gas monitoring for qualitative evaluation of hydrocarbon gas composition during deep sea drilling in the Nankai Trough Kumano Basin

机译:实时钻井泥浆气监测定性评价南海槽熊野盆地深海钻井过程中的烃气成分

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摘要

BackgroundIntegrated Ocean Drilling Program Expedition 338 was the second scientific expedition with D/V Chikyu during which riser drilling was conducted as part of the Nankai Trough Seismogenic Zone Experiment. Riser drilling enabled sampling and real-time monitoring of drilling mud gas with an onboard scientific drilling mud gas monitoring system (“SciGas”). A second, independent system was provided by Geoservices, a commercial mud logging service. Both systems allowed the determination of (non-) hydrocarbon gas, while the SciGas system also monitored the methane carbon isotope ratio (δ13CCH4). The hydrocarbon gas composition was predominated by methane (> 1%), while ethane and propane were up to two orders of magnitude lower. δ13CCH4 values suggested an onset of thermogenic gas not earlier than 1600 meter below seafloor. This study aims on evaluating the onboard data and subsequent geological interpretations by conducting shorebased analyses of drilling mud gas samples.
机译:背景技术集成海洋钻探计划探险队338是D / V Chikyu进行的第二次科学考察,在此期间,作为南开海槽地震发生带实验的一部分,进行了立管钻探。竖井钻探通过车载科学钻探泥浆气监测系统(“ SciGas”)实现了对钻探泥浆气的采样和实时监测。第二套独立的系统由商业录井服务Geoservices提供。两种系统都可以测定(非)烃类气体,而SciGas系统还可以监测甲烷碳同位素比(δ 13 CCH4)。碳氢化合物气体成分主要由甲烷(> 1%)组成,而乙烷和丙烷则降低了两个数量级。 δ 13 CCH4值表明在不超过海床以下1600米处发生了产热气体。这项研究旨在通过对钻井泥浆气体样品进行岸基分析来评估机载数据和后续的地质解释。

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