Differences of polygonal faults related to upper Miocene channels:a case study from the Beijiao sag of Qiongdongnan basin,South China Sea

作     者：Yufeng LI Renhai PU Xueqin ZHAO Gongcheng ZHANG Xiaowei FAN Jingjing BAO Jiong WANG Yufeng LI;Renhai PU;Xueqin ZHAO;Gongcheng ZHANG;Xiaowei FAN;Jingjing BAO;Jiong WANG

作者机构：School of Environment and ResourceSouthwest University of Science and TechnologyMianyang 621010China State Key Laboratory of Continental DynamicsDepartment of GeologyNorthwest UniversityXi’an 710069China Key Laboratory of Marine Mineral ResourcesMinistry of Natural ResourcesGuangzhou 510075China CNOOC Research InstituteBeijing 100028China Research Institute of Yangchang Petroleum(Group)Co.Ltd.Xi’an 710075China Laboratory of Ocean and Coast GeologyThird Institute of OceanographyMinistry of Natural ResourcesXiamen 361005China Central Sichuan Oil-Gas DistrictPetro-China Southwest Oil and Gas Field CompanySuining 629000China 

出 版 物：《Journal of Oceanology and Limnology》 (海洋湖沼学报（英文）)

年 卷 期：2023年第41卷第1期

页      面：84-99页

核心收录：

学科分类：08[工学] 0824[工学-船舶与海洋工程] 

基　　金：Supported by the Key Laboratory of Marine Mineral Resources Ministry of Land and Resources of China(No.KLMMR-2018-B-07) the National Basic Research Program of China(No.2011ZX05025-006-02) the National Natural Science Foundation of China(No.41672206) 

主　　题：polygonal faults coarse-grained channels fine-grained channels gravitational spreading overpressure hydrofracture 

摘      要：Deep-water coarse-grained channels are embedded within a polygonal fault tier,and the polygonal faults(PFs)present non-polygonal geometries rather than classic polygonal geometry in plan ***,PFs present differences when they encounter deep-water(coarse-grained ***-grained)channels with different lithology,which has not been further studied to ***-dimensional(3D)seismic data and a drilling well from Beijiao sag of Qiongdongnanbasin,South China Sea were utilized to document the plan view and cross-sectional properties of the PFs and their differences and genetic mechanism were *** show that,first,PFs can be divided morphologically into channel-segmenting PFs and channel-bounding PFs in plan *** former virtually cuts or segments the axes of channels in highand low-amplitudes,and the latter nearly parallels the boundaries of the *** are approximately perpendicular to each ***,channel-bounding PFs that related to low-amplitude channels are much longer than those of high-amplitude ones;channel-segmenting PFs related to low-amplitude channels are slightly longer than the counterparts related to high-amplitude ***,the magnitudes(e.g.,heights)of the PFs are proportional to the scales(e.g.,widths and heights)of low-amplitude channels,whereas the magnitudes of the PFs are inversely proportional to the scales of high amplitude ***-grained(high amplitude)channels act as a mechanical barrier to the propagation of PFs,whereas fine-grained(low-amplitude)channels are beneficial to the propagation and nucleation of ***,the genetic mechanism of PFs is discussed and reckoned as combined geneses of gravitational spreading and overpressure *** differences of the PFs can be used to reasonably differentiate coarse-grained channels from fine-grained *** study provides new insights into understanding the different geometries of the PFs related to coarse-grained and fine