A drilling data-constrained seismic mapping method for intermediate-mafic volcanic facies

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• 作者：Yuhui FENG^a ; Weihua BIAN^a ; ^{WeihuaBian@jlu.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Guozhong GU^b ; Yulong HUANG^a ; Jintao QIU^b ; Ang SUN^a ; Pujun WANG^a
• 关键词：intermediate-mafic volcanic rock ; volcanic facies ; seismic facies ; volcanic stratigraphy ; volcanic stage ; Liaohe Depression
• 刊名：Petroleum Exploration and Development
• 出版年：2016
• 出版时间：April 2016
• 年：2016
• 卷：43
• 期：2
• 页码：251-260
• 全文大小：6367 K

文摘

Based on 112.5 km² of 3-D seismic data and data of 8 prospecting wells drilled volcanic rocks in the 3^rd member of the Paleogene Shahejie Formation in Hongxing area of the Eastern Sag of the Liaohe Depression, Bohai Bay Basin, three levels of volcanic interfaces (stage→edifice→lithofacies) of the intermediate-mafic volcanic formation are identified to reveal favorable prospecting facies through comprehensive studies on geology, well logging and seismic data in single well and multiple wells following the seismic volcano stratigraphy principle. According to stage interfaces, three volcanic stages were identified in the 3^rd member of Shahejie Formation. One or more volcanic edifice-seismic facies were identified in each volcanic stage and volcanic facies-seismic facies were identified in each volcanic edifice-seismic facies. Based on single well points, we described volcanic edifices on well-tie seismic sections; identified volcanic bodies by extracting coherent seismic attribute (superimposed volcanic edifices) taking the volcanic stages as the units; then identified volcanic edifices and volcanic lithofacies by extracting waveform classification properties. Volcanic facies mapping were completed by constituting the relationship between the volcanic facies and the seismic facies in drilling wells, seismic cross sections and mappings. There are two types of plane volcanic facies sequences in the intermediate-mafic volcanic facies of this study area: volcanic conduit facies→extrusive facies (→explosive facies)→effusive facies→volcanic sedimentary facies, volcanic conduit facies (→explosive facies)→effusive facies→volcanic sedimentary facies. Among them, the near crater assemblage (volcanic conduit, extrusive and explosive facies) has better hydrocarbon shows and is the most favorable target of hydrocarbon exploration.