Oil and natural gas geochemistry in offshore China: Advances and challenges

IF 4.2 3区 工程技术 Q2 ENERGY & FUELS
Dujie Hou , Xiong Cheng , Lin Wei , Yajun Li , Kaikai Li , Ziming Zhang , Haiyue Zhang , Jiejing Bian , Yan Li , Wei Si , Zhenjie Jia , Jiahao He , Qian Huang
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Abstract

For many years, oil and natural gas geochemistry has been key to hydrocarbon exploration and exploitation in offshore China. Onshore oil fields have been thoroughly explored and exploited and have now entered the later stages of development. However, the oil and gas resources in the offshore basin of China are still abundant, and they have been relatively little explored, so they will be the main growth target for oil and gas production in the future. China has made many breakthroughs in offshore oil exploration in recent years. A large condensate field—Bozhong 19-6—has been discovered in the Bozhong Depression. Its main source rock is associated with algal blooming in the third member of the Shahejie Formation. The Baodao 21-1 gas field in the Qiongdongnan Basin shows clear signs of receiving terrestrial organic matter from the Yacheng and Lingshui formations. The first ultra-deep water and ultra-shallow gas, found in the Lingshui 36-1 gas field in the Qiongdongnan Basin, has thermogenetic and biogenetic origins. Well WY-1 in the Weixinan Depression marked the initiation of offshore shale oil exploration. Its sweet interval consists of two stable oil shale beds developed at the base and the top of the second member of the Liushagang Formation. However, samples from offshore exploration are often severely contaminated, and the corresponding data can be seriously distorted, which yields fewer core and more cutting samples. Therefore, it is necessary to thoroughly screen test data and to apply decontamination treatment and data correction to contaminated samples. The success rate of offshore exploration usually relies on the accurate prediction of source kitchens. Reservoir geochemistry thus has great significance for the future, as source input geochemical information can be used to trace materials backwards, and source kitchens can be predicted, when geochemistry is combined with enrichment and development models of source rocks and geophysical data.
多年来,油气地球化学一直是中国近海油气勘探开发的关键。陆上油田的勘探开发已经深入,目前已进入后期开发阶段。然而,中国近海盆地油气资源仍然丰富,勘探相对较少,因此将是未来油气产量增长的主要目标。近年来,中国在海上石油勘探方面取得了许多突破。在渤中坳陷发现了渤中19-6大型凝析油田。其主要烃源岩与沙河街组三段藻华有关。琼东南盆地宝岛21-1气田接收崖城组和陵水组陆相有机质的迹象明显。琼东南盆地陵水36-1气田首次发现超深水超浅层气,具有热成因和生物成因。涠西南坳陷WY-1井标志着海上页岩油勘探的开始。其甜蜜段由两个稳定的油页岩层组成,分别发育于六沙岗组二段底部和顶部。然而,海上勘探样品往往受到严重污染,数据失真严重,导致岩心少、岩屑多。因此,有必要彻底筛选试验数据,并对污染样品进行去污处理和数据校正。海上油气勘探的成功率通常依赖于对源灶的准确预测。因此,将地球化学与烃源岩富集发育模式和地球物理资料相结合,可以利用源输入地球化学信息回溯溯源,预测烃源灶,对未来具有重要意义。
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来源期刊
Natural Gas Industry B
Natural Gas Industry B Earth and Planetary Sciences-Geology
CiteScore
5.80
自引率
6.10%
发文量
46
审稿时长
79 days
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