| GAO Gang,ZHANG Gongcheng,CHEN Guo,GANG Wenzhe,SHEN Huailei,ZHAO Ke. 2018. Geochemistry of borehole cutting shale and natural gas accumulation in the deepwater area of the Zhujiang River Mouth-Qiongdongnan Basin in the northern South China Sea. Acta Oceanologica Sinica, 37(2):44－53 |
| Geochemistry of borehole cutting shale and natural gas accumulation in the deepwater area of the Zhujiang River Mouth-Qiongdongnan Basin in the northern South China Sea |
| 中国南海北部珠江口-琼东南盆地钻井岩屑地球化学特征及深水区天然气聚集特征 |
| Received:October 04, 2016 Revised:May 25, 2011 |
| DOI：10.1007/s13131-018-1151-2 |
| Key words:cutting shale organic geochemistry gas accumulation deepwater area Qiongdongnan Basin Zhujiang River Mouth Basin |
| 中文关键词: 岩屑 有机地球化学 天然气聚集 深水区 琼东南盆地 珠江口盆地 |
| 基金项目:The National Key Science and Technology Special Project (13th Five Year Plan) of the Key Technology of Gas and Oil Exploration in Offshore Deep Water Area (Phase 3) under contract No. 2016Zx05026. |
| Author Name | Affiliation | E-mail | | GAO Gang | State Key Laboratory of Petroleum Resource and Prospecting, China University of Petroleum (Beijing), Beijing 102249, China | gaogang2819@sina.com | | ZHANG Gongcheng | Research Institute, CNOOC, Beijing 100020, China | | | CHEN Guo | State Key Laboratory of Petroleum Resource and Prospecting, China University of Petroleum (Beijing), Beijing 102249, China | | | GANG Wenzhe | State Key Laboratory of Petroleum Resource and Prospecting, China University of Petroleum (Beijing), Beijing 102249, China | | | SHEN Huailei | Research Institute, CNOOC, Beijing 100020, China | | | ZHAO Ke | Geophysical Exploration Research Institute of Huabei Oilfield Company, Renqiu 062552, China | |
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| Abstract: |
| The Qiongdongnan Basin and Zhujiang River (Pearl River) Mouth Basin, important petroliferous basins in the northern South China Sea, contain abundant oil and gas resource. In this study, on basis of discussing impact of oil-base mud on TOC content and Rock-Eval parameters of cutting shale samples, the authors did comprehensive analysis of source rock quality, thermal evolution and control effect of source rock in gas accumulation of the Qiongdongnan and the Zhujiang River Mouth Basins. The contrast analysis of TOC contents and Rock-Eval parameters before and after extraction for cutting shale samples indicates that except for a weaker impact on Rock-Eval parameter S2, oil-base mud has certain impact on Rock-Eval S1, Tmax and TOC contents. When concerning oil-base mud influence on source rock geochemistry parameters, the shales in the Yacheng/Enping, Lingshui/Zhuhai and Sanya/Zhuhai Formations have mainly Type II and III organic matter with better gas potential and oil potential. The thermal evolution analysis suggests that the depth interval of the oil window is between 3 000 m and 5 000 m. Source rocks in the deepwater area have generated abundant gas mainly due to the late stage of the oil window and the high-supper mature stage. Gas reservoir formation condition analysis made clear that the source rock is the primary factor and fault is a necessary condition for gas accumulation. Spatial coupling of source, fault and reservoir is essential for gas accumulation and the inside of hydrocarbon-generating sag is future potential gas exploration area. |
| 中文摘要: |
| 琼东南盆地-珠江口盆地作为中国南海北部重要的含油气盆地，蕴含了丰富的油气资源。在本文中，根据油基泥浆对岩屑样品TOC含量以及热解参数影响的讨论，作者对烃源岩质量、热成熟度以及烃源岩对琼东南盆地和珠江口盆地油气聚集的控制作用进行了综合分析。岩屑样品TOC和热解参数在抽提前后差异分析表明，除了对S2有微弱影响外，油基泥浆对热解S1、Tmax以及TOC含量有明显的影响。当考虑油基泥浆对烃源岩地化特征的影响时，崖城组/恩平组、陵水组/珠海组与三亚组/珠海组主要以倾气型的II型或III型有机质为主。热成熟度分析表明，生油窗的深度范围大致在3000到5000米之间。深水区烃源岩在生油窗晚期的高成熟阶段已经生成了大量的天然气。天然气储层条件分析清晰地表明，针对天然气的聚集来说，烃源岩是主要因素，断层是必要条件。源-断-储耦合是天然气聚集的核心，并且生烃凹陷内部是未来潜在天然气勘探区。 |
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