Gas detection in tight sand with direct hydrocarbon indicators

PreviousNext No AccessInternational Conference on Engineering Geophysics, Al Ain, United Arab Emirates, 9-12 October 2017Gas detection in tight sand with direct hydrocarbon indicatorsAuthors: Ren JiangYonglin OuyangQingcai ZengJiaqiang HuangPei HeXiujiao WangLianqun ZhangRen JiangResearch Institute of Petroleum Exploration and Development-LangFang, Lang Fang, P. R. China Research Institute of Petroleum Exploration and Development-LangFang, Lang Fang, ChinaSearch for more papers by this author, Yonglin OuyangResearch Institute of Petroleum Exploration and Development-LangFang, Lang Fang, P. R. China Research Institute of Petroleum Exploration and Development-LangFang, Lang Fang, ChinaSearch for more papers by this author, Qingcai ZengResearch Institute of Petroleum Exploration and Development-LangFang, Lang Fang, P. R. China Research Institute of Petroleum Exploration and Development-LangFang, Lang Fang, ChinaSearch for more papers by this author, Jiaqiang HuangResearch Institute of Petroleum Exploration and Development-LangFang, Lang Fang, P. R. China Research Institute of Petroleum Exploration and Development-LangFang, Lang Fang, ChinaSearch for more papers by this author, Pei HeResearch Institute of Petroleum Exploration and Development-LangFang, Lang Fang, P. R. China Research Institute of Petroleum Exploration and Development-LangFang, Lang Fang, ChinaSearch for more papers by this author, Xiujiao WangResearch Institute of Petroleum Exploration and Development-LangFang, Lang Fang, P. R. China Research Institute of Petroleum Exploration and Development-LangFang, Lang Fang, ChinaSearch for more papers by this author, and Lianqun ZhangResearch Institute of Petroleum Exploration and Development-LangFang, Lang Fang, P. R. China Research Institute of Petroleum Exploration and Development-LangFang, Lang Fang, ChinaSearch for more papers by this authorhttps://doi.org/10.1190/iceg2017-018 SectionsAboutPDF/ePub ToolsAdd to favoritesDownload CitationsTrack CitationsPermissions ShareFacebookTwitterLinked InRedditEmail Abstract As tight gas sands are widely distributed in many Chinese basins such as Ordos, Sichuan, Tarim, Qaidam, Songliao, Junggar, which have a good resource prospect for gas supply. But it is difficult to identify the gas reservoir with conventional AVO methods because the porosity is less than 12% which leads to the tiny differences on elastic parameters, and the thickness of the reservoir is thin. Compared with present fluid detection techniques, there is a direct way to detect hydrocarbon with Russell fluid factor which can help to identify gas and water from tiny different AVO response, and it is an effective way to predict the gas saturation qualitatively. From the synthetic data test, it shows that the AVO curve is very close between the AVO formula proposed by Russell and Zoeppritz equation in limited angles (<30°), which indicated the fluid factor can be well fitted from the small incident angle prestack gathers with Russell formula. With feasibility study of gas detection in the tight sand reservoir of Sulige gas field, in the extent of effective reservoirs, the Russell fluid factor can represents the relative values of gas saturation. Finally the application results revealed that it is an effect way to detect gas in tight sand, showing the reliable result consistent with drilling result, it can help to utilize the subtle AVO information to identify fluid and indicate the gas saturation. The synthetic and the real data tests show that it is a reliable and feasible way to detect the fluid in tight sand with Russell fluid factor, providing a new way to predict the gas distribution in the vertical and horizontal direction. Keywords: AVO, impedance Permalink: https://doi.org/10.1190/iceg2017-018FiguresReferencesRelatedDetails International Conference on Engineering Geophysics, Al Ain, United Arab Emirates, 9-12 October 2017ISSN (online):2159-6832Copyright: 2017 Pages: 382 publication data© 2017 Published in electronic format with permission by Society of Exploration Geophysicists (SEG)Publisher:Society of Exploration Geophysicists HistoryPublished Online: 12 Oct 2017 CITATION INFORMATION Ren Jiang, Yonglin Ouyang, Qingcai Zeng, Jiaqiang Huang, Pei He, Xiujiao Wang, and Lianqun Zhang, (2017), "Gas detection in tight sand with direct hydrocarbon indicators," SEG Global Meeting Abstracts : 110-113. https://doi.org/10.1190/iceg2017-018 Plain-Language Summary KeywordsAVOimpedance PDF DownloadLoading ...