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Submarine fans developed in the middle Miocene Meishan Formation possess significant potential for natural gas exploration. Most of scholars believed that these Miocene submarine fans were formed primarily by turbidity currents. However, drilling cores revealed the presence of pebbles with a particle size of up to 5 cm in the sandy conglomerates. These sandy conglomerates exhibited good roundness and poor sorting, indicating that the traditional turbidity formation mechanism cannot fully explain the origin of this type of sandy conglomerates. Furthermore, the classic submarine fan model has limitations in predicting the distribution of sand bodies. Through a comprehensive study involving core, thin section observation, and grain size analysis, we have conducted a systematic investigation of the petrological characteristics and sedimentary structures of submarine fan in the study area. Our findings suggest that submarine fans in the study area resulted from the interaction of turbidity and hyperpycnal flow deposits. We have identified distinct sequences of turbidites and hyperpycnalites within the submarine fan. Based on the paleogeomorphlogy of the study area, we have established a genetic evolution model for the submarine fan in Meishan Formation. This model reveals that the hyperpycnites dominated by feldspathic litharenite, exhibit low compositional maturity. Poor sorting and subangular-circular of the rocks indicate middle-to-high structural maturity. Typical features of hyperpycnal flow include orientated gravel within block sandy conglomerates, reverse-to-normal grain order bedding, parallel bedding, carbonaceous debris, and biological fossil fragments. Multi stage superimposed turbidite sequence and hyperpycnites sequence developed in submarine fan in the study area. The early Meishan period is primarily composed of turbidite submarine fan lobes, while the middle Meishan period is dominated by hyperpycnites submarine fan channels. The late Meishan period, on the other hand, is mainly composed of turbidite submarine fan channels. We predict that more favorable submarine fan sand bodies could be found in the southern part of the study area. The results can serve as a basis for predicting the distribution of favorable submarine fan reservoirs of the Qiongdongnan Basin, and they hold significance for selecting exploration and development targets for hydrocarbon exploration.
, correspAuthors=null, authorNote=null, correspAuthorsNote=null, copyrightStatement=Haiyang Xuebao, copyrightOwner=null, extLink=null, articleAbsUrl=null, sourceXml=null, magXml=null, pdfUrl=null, pdf=null, pdfFileSize=null, pdfExtLink=null, richHtmlUrl=null, mobilePdfUrl=null, reviewReport=null, pdfFirstPage=null, abstractGraph=null, abstractGraphContent=null, abstractVideo=null, citation=null, cebUrl=null, magXmlContent=null, mapNumber=null, authorCompany=null, fund=null, authors=null, authorsList=Lianqiao Xiong, Xiaojun Xie, Wu Tang, Haiqiang Bai, Ziyu Liu, Jinxin Yu, Ying Chen), CN=ArticleExt(id=1200732567252095806, articleId=1200732563590468307, tenantId=1146029695717560320, journalId=1149651085930835976, language=CN, title=琼东南盆地乐东凹陷梅山组海底扇发育异重流:来自岩心的证据, columnId=1149698756456657529, journalTitle=海洋学报, columnName=论文, runingTitle=null, highlight=null, articleAbstract=
琼东南盆地乐东凹陷梅山组海底扇天然气勘探潜力大。大多数学者认为梅山组海底扇为浊流成因,但钻井岩心揭示,砂砾岩中发育粒径高达5 cm的砾石,砂砾岩段磨圆度好,分选性差,海底扇的浊流成因无法解释此类砂砾岩成因,同时,经典的海底扇模式对砂体分布预测存在局限。基于岩心、薄片观察和粒度分析,对研究区海底扇岩石学特征和沉积构造开展系统研究,提出研究区海底扇为浊流和异重流交互沉积成因,区分了浊积岩与异重岩垂向叠置序列;结合古地貌特征,建立起梅山组海底扇成因演化模式。结果表明,研究区梅山组异重岩成分成熟度低,以长石质岩屑砂岩为主,岩石分选极差、磨圆次棱角−圆状,为中−高结构成熟度;块状砂质砾岩中,砾石定向排列、逆正粒序层理、平行层理、炭屑与生物化石碎片等构造是异重流沉积的典型特征;研究区海底扇发育多期浊积岩与异重岩叠置序列,梅山组早期以浊流沉积朵叶为主,中期以异重流沉积水道为主,晚期以浊流沉积水道为主,预测研究区南部发育更有利的海底扇储集砂体。成果可以为琼东南盆地海底扇有利砂体分布预测提供依据,对油气田勘探开发目标选取具有指导意义。
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熊连桥,谢晓军,唐武,等. 琼东南盆地乐东凹陷梅山组海底扇发育异重流:来自岩心的证据[J]. 海洋学报,2024,46(12):53–65Xiong Lianqiao,Xie Xiaojun,Tang Wu, et al. Hyperpycnal flow found in submarine fan of the Meishan Formation in Ledong Sag in Qiongdongnan Basin: evidence from the drilling cores[J]. Haiyang Xuebao,2024, 46(12):53–65
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熊连桥(1986—),男,四川省金阳县人,博士,高级工程师,主要从事沉积与储层地质研究。E-mail: xionglq2@cnooc.com.cn
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熊连桥(1986—),男,四川省金阳县人,博士,高级工程师,主要从事沉积与储层地质研究。E-mail: xionglq2@cnooc.com.cn
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Marine Geology & Quaternary Geology, 2022, 42(6): 173−184., articleTitle=null, refAbstract=null)], funds=[Fund(id=1200812298412609561, tenantId=1146029695717560320, journalId=1149651085930835976, articleId=1200732563590468307, awardId=U24B2016, language=CN, fundingSource=国家自然科学基金(U24B2016), fundOrder=null, country=null), Fund(id=1200812298492301340, tenantId=1146029695717560320, journalId=1149651085930835976, articleId=1200732563590468307, awardId=null, language=CN, fundingSource=南海北部深水区深层温压场差异性演化对优质储层的控制机理, fundOrder=null, country=null), Fund(id=1200812298597158942, tenantId=1146029695717560320, journalId=1149651085930835976, articleId=1200732563590468307, awardId=KJGG2021-0100, language=CN, fundingSource=中国海洋石油集团有限公司“十四五”重大科技项目(KJGG2021-0100), fundOrder=null, country=null)], companyList=[AuthorCompany(id=1200812292372812589, tenantId=1146029695717560320, journalId=1149651085930835976, articleId=1200732563590468307, xref=null, ext=[AuthorCompanyExt(id=1200812292377006894, tenantId=1146029695717560320, journalId=1149651085930835976, articleId=1200732563590468307, companyId=1200812292372812589, language=EN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=1. 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Location of the study area and the strata of Qiongdongnan Basin (modified from reference [24]), figureFileSmall=2X760Qf1aBjwntPSBbuA8A==, figureFileBig=YKnfob/LhPucdyFXb9T9cg==, tableContent=null), ArticleFig(id=1200812296344818644, tenantId=1146029695717560320, journalId=1149651085930835976, articleId=1200732563590468307, language=CN, label=图1, caption=
研究区地理位置及地层柱状图(据文献[24]修改), figureFileSmall=2X760Qf1aBjwntPSBbuA8A==, figureFileBig=YKnfob/LhPucdyFXb9T9cg==, tableContent=null), ArticleFig(id=1200812296458064857, tenantId=1146029695717560320, journalId=1149651085930835976, articleId=1200732563590468307, language=EN, label=Fig. 2, caption=
Lithology and triangular diagram of rock types of the Meishan Formation in the Ledong Sag in Qiongdongnan Basin, figureFileSmall=aBQUfUM/cYRwVLtAeOO8bw==, figureFileBig=/LVneybhGo+0nSD7U2JLbw==, tableContent=null), ArticleFig(id=1200812296575505372, tenantId=1146029695717560320, journalId=1149651085930835976, articleId=1200732563590468307, language=CN, label=图2, caption=
琼东南盆地乐东凹陷梅山组岩性与岩石类型三角图, figureFileSmall=aBQUfUM/cYRwVLtAeOO8bw==, figureFileBig=/LVneybhGo+0nSD7U2JLbw==, tableContent=null), ArticleFig(id=1200812296663585761, tenantId=1146029695717560320, journalId=1149651085930835976, articleId=1200732563590468307, language=EN, label=Fig. 3, caption=
Grain size probability plot of sand stones in the Meishan Formation in the Ledong Sag in Qiongdongnan Basin, figureFileSmall=nCSGofuAP5Cu/LjO7U2w0w==, figureFileBig=sInlFUkwfoJM5DYNaiPsSg==, tableContent=null), ArticleFig(id=1200812296730694630, tenantId=1146029695717560320, journalId=1149651085930835976, articleId=1200732563590468307, language=CN, label=图3, caption=
琼东南盆地乐东凹陷梅山组砂岩粒度概率累计曲线, figureFileSmall=nCSGofuAP5Cu/LjO7U2w0w==, figureFileBig=sInlFUkwfoJM5DYNaiPsSg==, tableContent=null), ArticleFig(id=1200812296806192104, tenantId=1146029695717560320, journalId=1149651085930835976, articleId=1200732563590468307, language=EN, label=Fig. 4, caption=
Sedimentary characteristics of the Meishan Formation in A1 well in the Ledong Sag in Qiongdongnan Basin, figureFileSmall=Vqpnb3ZJJloTrNEAyWFEVw==, figureFileBig=1xG+zsuc0gOjdy16AxpQEg==, tableContent=null), ArticleFig(id=1200812296932021228, tenantId=1146029695717560320, journalId=1149651085930835976, articleId=1200732563590468307, language=CN, label=图4, caption=
琼东南盆地乐东凹陷A1井梅山组典型沉积构造特征, figureFileSmall=Vqpnb3ZJJloTrNEAyWFEVw==, figureFileBig=1xG+zsuc0gOjdy16AxpQEg==, tableContent=null), ArticleFig(id=1200812297028490225, tenantId=1146029695717560320, journalId=1149651085930835976, articleId=1200732563590468307, language=EN, label=Fig. 5, caption=
Lithology characteristics and vertical depositional sequence of turbidite in A1 well in the Ledong Sag in Qiongdongnan Basin, figureFileSmall=tgm3fbBJS5NwBHLZykWs5g==, figureFileBig=Dph2JJ1X0rn06RoPWn8H2w==, tableContent=null), ArticleFig(id=1200812297112376309, tenantId=1146029695717560320, journalId=1149651085930835976, articleId=1200732563590468307, language=CN, label=图5, caption=
琼东南盆地乐东凹陷A1井浊积岩岩心特征及叠置序列, figureFileSmall=tgm3fbBJS5NwBHLZykWs5g==, figureFileBig=Dph2JJ1X0rn06RoPWn8H2w==, tableContent=null), ArticleFig(id=1200812297238205433, tenantId=1146029695717560320, journalId=1149651085930835976, articleId=1200732563590468307, language=EN, label=Fig. 6, caption=
Lithology characteristics and vertical depositional sequence of hyperpycniate in A1 well in the Ledong Sag in Qiongdongnan Basin, figureFileSmall=39UFOEkhm4cCF1ekBH7+jw==, figureFileBig=DIy3b+FMUskrLDrw4e6q4Q==, tableContent=null), ArticleFig(id=1200812297347257341, tenantId=1146029695717560320, journalId=1149651085930835976, articleId=1200732563590468307, language=CN, label=图6, caption=
琼东南盆地乐东凹陷A1井异重岩岩心及叠置序列, figureFileSmall=39UFOEkhm4cCF1ekBH7+jw==, figureFileBig=DIy3b+FMUskrLDrw4e6q4Q==, tableContent=null), ArticleFig(id=1200812297443726335, tenantId=1146029695717560320, journalId=1149651085930835976, articleId=1200732563590468307, language=EN, label=Fig. 7, caption=
Sedimentary evolutionary sequence with sea level change of the Meishan Formation in A1 well in the Ledong Sag in Qiongdongnan Basin (sea level curve modified from reference [36]), figureFileSmall=H8l4ggdqS/melAAMf4iwnQ==, figureFileBig=s/E+WerOc97NT5bGtvgj+g==, tableContent=null), ArticleFig(id=1200812297548582913, tenantId=1146029695717560320, journalId=1149651085930835976, articleId=1200732563590468307, language=CN, label=图7, caption=
琼东南盆地乐东凹陷A1井梅山组沉积演化序列与海平面变化(海平面变化曲线据文献[36]), figureFileSmall=H8l4ggdqS/melAAMf4iwnQ==, figureFileBig=s/E+WerOc97NT5bGtvgj+g==, tableContent=null), ArticleFig(id=1200812297632468997, tenantId=1146029695717560320, journalId=1149651085930835976, articleId=1200732563590468307, language=EN, label=Fig. 8, caption=
Characteristics of paleogeomorphology and seismic attribute of the Meishan Formation in Qiongdongnan Basin, figureFileSmall=iwXiwNgJNnV1MqxaZdWaSw==, figureFileBig=a1Xs8LVpT8JiZLpveATnQw==, tableContent=null), ArticleFig(id=1200812297733132296, tenantId=1146029695717560320, journalId=1149651085930835976, articleId=1200732563590468307, language=CN, label=图8, caption=
琼东南盆地梅山组古地貌与地震属性特征, figureFileSmall=iwXiwNgJNnV1MqxaZdWaSw==, figureFileBig=a1Xs8LVpT8JiZLpveATnQw==, tableContent=null), ArticleFig(id=1200812297858961417, tenantId=1146029695717560320, journalId=1149651085930835976, articleId=1200732563590468307, language=EN, label=Fig. 9, caption=
Evolution model of the genetic mechanism of submarine fan in the Ledong Sag in Qiongdongnan Basin, figureFileSmall=H5E7jjXtNK/S9aWs7YEZJQ==, figureFileBig=6hJPWpOVsLxaifq5ev2Ebw==, tableContent=null), ArticleFig(id=1200812297955430413, tenantId=1146029695717560320, journalId=1149651085930835976, articleId=1200732563590468307, language=CN, label=图9, caption=
琼东南盆地乐东凹陷海底扇成因演化模式, figureFileSmall=H5E7jjXtNK/S9aWs7YEZJQ==, figureFileBig=6hJPWpOVsLxaifq5ev2Ebw==, tableContent=null), ArticleFig(id=1200812298056093713, tenantId=1146029695717560320, journalId=1149651085930835976, articleId=1200732563590468307, language=EN, label=Table 1, caption=
Sedimentary structure and compositional maturity of A1 well clastic rock in Meishan Formation in the Ledong Sag in Qiongdongnan Basin
, figureFileSmall=null, figureFileBig=null, tableContent=
| 岩性 | 样品数 | 分选性 | 单晶石英(Q)百分含量/% (低~高/平均) | 长石(F)百分含量/% (低~高/平均) | 岩屑(R)百分含量/% (低~高/平均) | 泥质杂基百分含量/% (低~高/平均) | 结构与成分 成熟度评判 |
| 砾岩 | 27 | 差 | 3~52/21.1 | 0~20.5/9.4 | 24~81.5/54.7 | 0~7/1.6 | 低结构成熟 极低成分成熟 |
| 含砂砾岩 | 19 | 差 | 31~55.5/40.5 | 7~19/12.7 | 15.5~42/28 | 0~10/1.9 | 中−低结构成熟 低成分成熟 |
| 粗砂岩 | 9 | 差 | 20~32.5/25.4 | 11~19/14.7 | 32~52/43.3 | 0~2/0.7 | 中结构成熟 极低成分成熟 |
| 细−中砂岩 | 10 | 中 | 36~63/53.3 | 7~13/10.1 | 10.5~40/17.7 | 0~5/0.8 | 高结构成熟 中成分成熟 |
| 粉砂岩 | 5 | 中 | 51.5~56/53.8 | 8~12/10 | 14.5~15.5/15 | 0~0/0 | 高结构成熟 中成分成熟 |
), ArticleFig(id=1200812298207088660, tenantId=1146029695717560320, journalId=1149651085930835976, articleId=1200732563590468307, language=CN, label=表1, caption=
琼东南盆地乐东凹陷A1井梅山组碎屑岩沉积结构与成分成熟度
, figureFileSmall=null, figureFileBig=null, tableContent=
| 岩性 | 样品数 | 分选性 | 单晶石英(Q)百分含量/% (低~高/平均) | 长石(F)百分含量/% (低~高/平均) | 岩屑(R)百分含量/% (低~高/平均) | 泥质杂基百分含量/% (低~高/平均) | 结构与成分 成熟度评判 |
| 砾岩 | 27 | 差 | 3~52/21.1 | 0~20.5/9.4 | 24~81.5/54.7 | 0~7/1.6 | 低结构成熟 极低成分成熟 |
| 含砂砾岩 | 19 | 差 | 31~55.5/40.5 | 7~19/12.7 | 15.5~42/28 | 0~10/1.9 | 中−低结构成熟 低成分成熟 |
| 粗砂岩 | 9 | 差 | 20~32.5/25.4 | 11~19/14.7 | 32~52/43.3 | 0~2/0.7 | 中结构成熟 极低成分成熟 |
| 细−中砂岩 | 10 | 中 | 36~63/53.3 | 7~13/10.1 | 10.5~40/17.7 | 0~5/0.8 | 高结构成熟 中成分成熟 |
| 粉砂岩 | 5 | 中 | 51.5~56/53.8 | 8~12/10 | 14.5~15.5/15 | 0~0/0 | 高结构成熟 中成分成熟 |
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