珠江口盆地阳江东凹始新统的源汇过程:碎屑锆石定年及物源示踪

杜晓东, 彭光荣, 吴静, 蔡国富, 汪晓萌, 索艳慧, 周洁

杜晓东, 彭光荣, 吴静, 蔡国富, 汪晓萌, 索艳慧, 周洁. 珠江口盆地阳江东凹始新统的源汇过程:碎屑锆石定年及物源示踪[J]. 海洋地质与第四纪地质, 2021, 41(6): 124-137. DOI: 10.16562/j.cnki.0256-1492.2021071301
引用本文: 杜晓东, 彭光荣, 吴静, 蔡国富, 汪晓萌, 索艳慧, 周洁. 珠江口盆地阳江东凹始新统的源汇过程:碎屑锆石定年及物源示踪[J]. 海洋地质与第四纪地质, 2021, 41(6): 124-137. DOI: 10.16562/j.cnki.0256-1492.2021071301
DU Xiaodong, PENG Guangrong, WU Jing, CAI Guofu, WANG Xiaomeng, SUO Yanhui, ZHOU Jie. Tracing source-to-sink process of the Eocene in the Eastern Yangjiang Sag, Pearl River Mouth Basin: Evidence from detrital zircon spectrum[J]. Marine Geology & Quaternary Geology, 2021, 41(6): 124-137. DOI: 10.16562/j.cnki.0256-1492.2021071301
Citation: DU Xiaodong, PENG Guangrong, WU Jing, CAI Guofu, WANG Xiaomeng, SUO Yanhui, ZHOU Jie. Tracing source-to-sink process of the Eocene in the Eastern Yangjiang Sag, Pearl River Mouth Basin: Evidence from detrital zircon spectrum[J]. Marine Geology & Quaternary Geology, 2021, 41(6): 124-137. DOI: 10.16562/j.cnki.0256-1492.2021071301

珠江口盆地阳江东凹始新统的源汇过程:碎屑锆石定年及物源示踪

基金项目: 中海石油(中国)有限公司重大生产科研项目“珠江口盆地(东部)浅水区古近系油气成藏条件及勘探突破方向”(SCKY-2020-SZ-21)
详细信息
    作者简介:

    杜晓东(1986—),男,硕士,工程师,主要从事珠江口盆地石油地质研究工作,E-mail:duxd5@cnooc.com.cn

  • 中图分类号: P736.21

Tracing source-to-sink process of the Eocene in the Eastern Yangjiang Sag, Pearl River Mouth Basin: Evidence from detrital zircon spectrum

  • 摘要: 阳江东凹为近年来珠江口盆地取得重要勘探突破的凹陷。为阐明阳江东凹始新统文昌组-恩平组物源区、物源转换等源汇过程,以锆石U-Pb定年为主要技术手段,对研究区文昌组和恩平组7件砂岩的碎屑锆石形态和年龄进行了分析。结果表明,(1)在文昌组时期,阳江东凹以周缘凸起的中生代岩浆岩为物源区,为珠江口盆地内部(简称“盆内”)近物源输入,且物源输入量小,利于半-深湖相烃源岩的发育。文昌组的优质烃源岩为本地区油气勘探提供了物质基础。(2)在恩平组下段沉积期,凹陷主体的物源来自阳江-一统暗沙断裂带西侧较远区域出露的加里东晚期岩浆岩或其再循环沉积物,局部仍由周缘凸起供源,洼陷由盆内近物源转变为盆内远物源为主;恩平组上段沉积期,洼陷兼具盆内物源和珠江口盆地外部(简称“盆外”)物源的贡献,其中盆外物源来自华南板块,并且从该时期开始,华南板块物源供给增强,并逐渐控制了整个凹陷的沉积充填。整个恩平组时期,物源供给持续增强及控洼断裂活动性减弱造成洼陷被浅水辫状三角洲所主导。
    Abstract: Important breakthroughs have been achieved in hydrocarbon exploration recently in the Eastern Yangjiang Sag of the Pearl River Mouth Basin. In order to clarify the provenance of sediments and the process of provenance transition of the Eocene Wenchang-Enping Formation in the Eastern Yangjiang Sag, the detrital zircon morphology and ages of 7 sandstones from the Wenchang Formation and the Enping Formation are analyzed, with zircon U-Pb dating method. The results show that: (1) the sediments of the Wenchang Formation are sourced from some peripheral uplifts consisting of Mesozoic magmatic rocks. They are called in-basin provenances in this paper, which, with limited input, is beneficial to the formation of semi-deep lacustrine source rocks. The sediment source as such founded the material basis for petroleum generation in this area. (2) During the time of Early Enping Period, the provenance of the sag is dominated by Caledonian magmatic rocks or their recycled sediments exposed in the area far to the west of the Yangjiang-Yitong Fault Zone. Even the sediments for some small areas are still supplied by the peripheral uplifts, the basin provenances had changed from near-source to far-source ones. While the upper member of the Enping Formation was deposited, the sag is filled by the materials from both South China plate and peripheral uplifts with the gradually increase of material supply from the South China Plate. Both the enhancement of material supply and the weakening of sag-controlling faults lead to the sag dominated by shallow braided delta during the whole Period of Enping Formation.
  • 多年以来,前人针对西湖凹陷平湖组沉积环境开展了大量的研究,形成了多种认识,如彭伟欣[1]认为平湖组下段平中地区为海湾环境、平北地区为淡化海湾沉积环境,平湖组中段在平中、平北地区均为潮坪—沼泽环境,平湖组上段在平中、平北地区均已演化为河控三角洲环境;刘成鑫[2]利用古生物化石资料研究,认为平湖组上部为陆相沉积,中下部为海相沉积;杨彩虹[3]认为平湖斜坡带平湖组沉积接近浅水环境下辫状河三角洲的沉积特征等。总结前人的观点,多数学者认为西湖凹陷平湖组沉积处于半封闭海湾环境,海陆过渡相三角洲是最主要的沉积体系类型,差别在于海洋潮汐作用和海岸带河流作用哪个更强,或起主导作用。另外,对于研究区沉积体系及潮汐作用的研究仍停留在定性阶段,缺乏量化分析开展精细研究。

    本文在前人研究基础上,综合利用沉积构造、岩性组合、测井、地震等资料对A气田平湖组沉积环境和沉积体系类型展开系统研究,识别了河控三角洲、潮汐影响三角洲及潮控三角洲三种沉积体系类型;借助小波分析、频谱检测等手段及相对海平面变化曲线对研究区周期性海平面升降展开定量探讨,进而指导区域等时地层格架的建立,在沉积模式的指导下结合地震属性,预测有利砂体发育位置,对下一步勘探开发具有一定的指导意义。

    西湖凹陷总体构造格架具有东西分带、南北分块的特征,主要可划分为三个一级构造单元,及东部边缘断裂带、中央反转构造带、西部斜坡带,A气田位于西湖凹陷西部斜坡带(图1)。经历了古新世—始新世断陷(裂谷期)、渐新世—中新世拗陷(准前陆期)及上新世至今区域沉降(陆架广盆)三个主要地质历史阶段。因其所处的构造位置特殊,又经历了瓯江运动、玉泉运动和龙井运动等构造运动,从而形成了一套具海陆交互相的沉积格局,其中平湖组处于断–拗转换期,是西湖凹陷重要含油气目的层[4-6]

    图  1  A气田工区位置及井位综合柱状图
    Figure  1.  Tectonic map and integrated column of Gas field A

    纵向上,A气田自下而上钻遇7套新生界地层(图1):始新统平湖组(T40—T30),渐新统花港组(T30—T20),中新统龙井组、玉泉组、柳浪组(T20—T10),上新统三潭组(T10—T0)和第四系东海群[7]。根据上海分公司研究成果表明,平湖组沉积时期为32~40.4 Ma,结合本气田各井钻遇的区域性标志层、沉积旋回、地层厚度、电性等地质特征,对A气田进行三级层序划分:平上段(SQ3)对应P1—P4砂层组,平中段(SQ2)对应P5—P8砂层组,气田内部平下段(SQ1)地层未钻遇。

    通过对A气田及周边平湖组岩心观察分析(表1),可以揭示平湖组沉积环境纵向变化规律:P11—P5受潮汐影响显著,为典型潮间带沉积环境;P4—P1以潮上带河道沉积为主。

    P11—P5层沉积构造极为丰富,除了发育典型波状层理、透镜状层理、脉状层理,还可见大量的黏土层,黏土层组合形成潮汐韵律层理。局部夹杂褐色泥岩段,泥岩段厚度一般为1~2 cm,指示潮间带间歇性暴露的特征。

    P4—P1砂层组以分流河道砂体为主,发育块状层理、平行层理、斜层理、爬升层理,同时局部可见小型羽状交错层理,生物扰动等沉积构造,表明潮汐作用弱,水体较浅。

    在受潮汐作用的影响或潮控沉积体系之中,水体环境频繁变化,GR测井曲线上表现出高齿化程度;在河流作用的沉积体系之中,水体环境相对稳定,变换频次低,GR测井曲线上表现出低齿化程度。齿化程度与相邻GR值的差异有关。因此,本文将△GR值(测井曲线齿化程度)作为在河潮交互区域定量化表征河控与潮控沉积体系的参数值。△GR为相邻两个GR的差值,各深度的△GR等于该深度的GR减去上覆(下伏)地层相邻地层的GR值。

    通过对X3井平湖组地层△GR计算分析(图2),X3井△GR值呈现明显的三段式:2890.72~3092.72 m(P1—P4),△GR齿化程度较低(△GR<10),河控作用占主导;3092.72~3294.72 m(P5—P7),△GR齿化程度略微增大(10<△GR<15),沉积体系以受潮汐影响三角洲沉积体系为主;3294.72~3698.72 m(P8—P11),△GR齿化程度较大(15<△GR<20),表明该层段受潮汐影响显著,水体环境波动频繁。

    图  2  X3井平湖组地层不同沉积体系△GR响应特征
    Figure  2.  △GR responses to different depositional systems of Pinghu Formation, well X3

    采用同样方法,对区域上X3-X2-X1三口井展开沉积体系表征(图3),分析表明,纵向上自平湖组底至顶部△GR齿化程度降低,△GR值变小,表明潮汐作用减弱,沉积体系由潮控三角洲沉积体系渐变为潮–河联控三角洲沉积体系再转变为河控三角洲沉积体系;平面上自高带至低带,△GR齿化程度逐渐增大,潮汐作用逐渐增强。

    图  3  X3-X2-X1井平湖组沉积体系表征
    Figure  3.  Depositional system characterization of Pinghu Formation, wells X3, X2 and X1

    通过对研究区岩心、测井资料证实平湖组中下段地层受潮汐影响程度显著,而潮汐的作用与天体之间的相互作用密切相关,其表现形式为海平面周期性升降,文章基于米兰科维奇旋回理论,对海平面变化的周期性进行探讨。

    稳定沉积地层的岩心、露头以及与气候变化相关联的替代性指标均可用于米兰科维奇旋回的研究[8-10],本文采用连续采样的测井数据GR作为高频旋回研究对象,采样间隔0.125 m。对研究区深度域的GR数据进行频谱分析,根据频谱峰值对应的频率(旋回厚度倒数)比值与理论轨道周期比值进行比对(误差≤5%),以确定相应天文周期。

    目前,气田内部共4口钻井(X4、X5、X1、X6井),其中X1井完钻深度最深,且地层保留较完整,未受剥蚀。所以,以X1井为例,对该井平湖组GR曲线进行归一化、去噪预处理之后进行频谱检测[11]。频谱检测采用Boris Priehs教授基于Matlab开发的Redfit图形用户界面(最新版本见https://www.marum.de/Prof.-Dr.-michael-schulz/Michael-Schulz-Software.html),分析结果显示处于90%可信度之上的主要旋回厚度为80.1、22、8、4.1 m(图4),比例关系约为20:5:2:1,与米兰科维奇理论周期比(405 ka:95 ka:40 ka:19 ka)21:5:2:1非常接近[12-13]。因此,认为X1井平湖组沉积受天文周期所驱动。

    图  4  X1井频谱分析
    x轴表示频率,其倒数代表旋回厚度,y轴表示振幅,代表频率的显著程度。
    Figure  4.  Spectrum analysis of Well X1
    x axis represents frequency, the count backwards represents the cycle thickness, y axis represents the spectral amplitude which represents the significant degree of frequency.

    地层中的米氏沉积旋回与四、五、六级高频层序的持续时间相当,一般认为四级层序(中期旋回)受偏心率长周期控制,五级层序(短期旋回)受控于偏心率短周期,六级层序(超短周期)受控于斜率以及岁差[14]。通过小波变换[15-17],分别以从原始测井GR曲线中滤出405 ka偏心率滤波曲线作为四级层序划分的依据,从而确定X1井高频层序划分方案,同时以405 ka滤波曲线为调谐曲线,以理论偏心率周期405 ka周期曲线为目标曲线,建立平湖组高分辨天文年代标尺(图5)。共在X1井中识别11.5个由405 ka长偏心率周期所控制的四级沉积旋回,持续时间大约为4655 ka,以平湖组顶部年龄32 Ma(±0.5)为控制年龄,可推算X1井所钻遇地层底部年龄为36.655 Ma。对比36.655~32 Ma全球海平面变化[18],X1井所钻遇地层沉积时期,海平面整体表现为先上升后下降的过程,其中以P7沉积时期海平面上升速率最大,P5之后海平面呈缓慢下降趋势。

    图  5  X1井平湖组天文年代标尺
    Figure  5.  Astronomical timescale of the Pinghu Formation, well X1

    已证实平湖组沉积受米氏旋回周期所驱动,其中以405 ka长偏心率周期最为显著。通过小波变换,提取GR曲线中主要旋回周期(长偏心率周期)所对应的小波系数,分别与定量化表征河控与潮控沉积体系的参数ΔGR以及反映相对水体变化的INPEFA曲线进行对比分析[19-20],分析表明P4及以下地层ΔGR变化峰值、小波系数及代表相对水体变化的INPEFA曲线峰值三者之间具有非常高的匹配性(图6),P4之上地层由于河控体系占主导,不受全球海平面变化的控制。因此可以推断,在X1井平湖组P4—P7地层中,海平面呈规律性升降,每次海平面升降间隔时间约405 ka。

    图  6  X1井平湖组INPEFA曲线、小波系数、△GR对应关系图
    ①—⑦代表7次海侵。
    Figure  6.  INPEFA curve, wavelet coefficient, △ GR corresponding graph of Pinghu Formation, well X1
    ①—⑦ represent the seven transgressions.

    通过上述定量分析,西湖凹陷A气田平湖组受潮汐作用影响显著,期间共发生7次规模较大的区域性海平面升降,以煤层作为辅助标志层对气田内平湖组开展高频层序划分与对比(图7)。

    图  7  西湖凹陷A气田高频层序划分
    Figure  7.  High frequency sequence division of Gas field A in Xihu Depression

    P4之上地层由于以陆相沉积为主,不受海平面升降影响,因此无法依据相对海平面的升降对该段地层展开高频旋回划分。在西湖凹陷A气田平湖组P4—P7地层中共识别7个高频旋回,每个高频层序内部包括上升半旋回和下降半旋回,即一个完整的海平面上升及下降周期,每一个高频旋回周期时间跨度约为405 ka。

    在高频等时地层格架建立的基础上,重点对P7、P6两层砂体对比与平面展布特征展开分析,以揭示砂体发育规律。

    P7沉积时期(35.491~35.116 Ma),处于全球海平面快速上升阶段,整体砂地比较低,以泥岩沉积为主,局部发育较薄河道砂及潮汐沙坝等沉积微相,砂体以指型、漏斗型为主,局部存在微齿箱型(图8)。平均渗透率9.3 mD,平均孔隙度12.8%。平面上,三角洲发育规模较小,受潮汐作用、波浪改造影响,砂体沿断层展布(图9)。

    图  8  西湖凹陷A气田P7层砂体对比图
    Figure  8.  Comparison of P7 sand bodies in Gas field A of Xihu Depression
    图  9  西湖凹陷A气田P7层常规地震振幅属性图和P7层沉积微相图
    Figure  9.  Conventional seismic amplitude attribute of layer P7in gas field A of Xihu Sag, Sedimentary microfacies of P7layer in gas field A of Xihu Sag.

    P6沉积时期(35.116~34.576 Ma),全球海平面缓慢上升,可容纳空间持续增大,砂体主要由两期潮汐沙坝叠置而成,厚度14~19 m,局部发育小型水下分流河道砂,测井曲线以漏斗型为主(图10),平均渗透率4.95 mD,孔隙度11.5%。平面上,受潮汐影响,三角洲前缘朵体被切割改造,常规地震切片可见明显潮沟,最大宽度可达700 m(图11)。

    图  10  西湖凹陷A气田P6层砂体对比图
    Figure  10.  Comparison of P6 sand bodies in gas field A of Xihu Depression
    图  11  西湖凹陷A气田P6层常规地震振幅属性图和P6砂层组沉积微相图
    Figure  11.  Conventional seismic amplitude attribute of layer P6in gas field A of Xihu Sag, Sedimentary microfacies of layer P6 in gas field A of Xihu Sag.

    对比P7、P6两层砂体发育特征,P7—P6储层物性与埋深呈负相关,结合沉积背景,P7、P6砂层组处于海平面快速上升至缓慢上升阶段,砂体受潮汐作用的淘洗、改造,储层物性改善明显,所以潮汐作用对深层优势储层的发育有不可忽视的作用。目前已钻井集中在气田中高部位,低部位受潮汐影响更强,因此推测潮下带潮汐改造砂体可以作为A气田深层优质储集体,是未来有利勘探开发方向。

    (1)综合利用岩心、测井(△GR)等资料对西湖凹陷A气田沉积环境进行定量表征,纵向上可划分潮控三角洲沉积体系、潮河联控沉积体系及河控沉积体系,其中潮控三角洲沉积体系10<△GR<20,岩心上可见典型潮汐韵律层理;潮-河联控沉积体系10<△GR <15,岩心上生物扰动现象逐渐增多,局部可见透镜状、脉状层理;河控沉积体系中△GR<10,岩心上生物扰动现象丰富,砂岩以块状层理为主,局部夹杂褐色泥砾。

    (2)基于米兰科维奇理论,通过小波、频谱分析等手段并结合全球海平面变化曲线对西湖凹陷A气田平湖组地层周期性海平面升降进行探讨分析,证实A气田平湖组地层沉积受米兰科维奇旋回所驱动,期间共发生7次较大规模海平面升降事件,每次事件间隔大约为一个长偏心率周期(405 ka),并依此指导A气田平湖组等时层序格架的建立。

    (3)在层序格架建立基础上,重点对靶区内P7、P6两层砂体发育特征进行解剖,分析表明潮汐作用对靶区内砂体改造作用较强,有利于优势储层发育。结合平面属性、沉积展布规律,认为低部位潮汐改造砂体是未来有利勘探开发方向。

  • 图  1   阳江东凹构造单元划分

    Figure  1.   Tectonic map of the Eastern Yangjiang Sag

    图  2   珠江口盆地阳江东凹综合地层柱状图

    Figure  2.   Stratigraphic column of the Eastern Yangjiang Sag,the Pearl River Mouth Basin

    图  3   4口钻井始新统地层划分与GR测井曲线剖面对比

    Figure  3.   Correlation of Eocene lithological units and their GR logging data from 4 wells

    图  4   阳江东凹砂岩碎屑锆石Th/U值

    Figure  4.   Th/U ratio of detrital zircons of sandstones in the Eastern Yangjiang Sag

    图  5   阳江东凹砂岩碎屑锆石阴极发光图像

    数字为年龄(Ma)。

    Figure  5.   CL images of detrital zircons of sandstones in the Eastern Yangjiang Sag

    图  6   阳江东凹砂岩碎屑锆石U-Pb年龄分布

    Figure  6.   U-Pb age distribution of detrital zircons from sandstones in the Eastern Yangjiang Sag

    图  7   阳江东凹砂岩碎屑锆石U-Pb年龄谱(峰值年龄/Ma)

    Figure  7.   U-Pb age spectra of detrital zircons from sandstones in the Eastern Yangjiang Sag

    图  8   潜在物源区(a)及相应的碎屑锆石年龄谱图(b)

    b图中,I据本项目未发表数据,II-VI据参考文献[22]。

    Figure  8.   Potential provenances (a) and their corresponding detrital zircon age spectra (b)

    图  9   阳江东凹文昌组二段盆内近物源体系源汇模式图

    Figure  9.   Near in-basin provenances and source-sink pattern of the Wenchang-2 Member in the Eastern Yangjiang Sag

    图  10   阳江东凹恩平组上段盆内-盆外双物源体系源汇模式

    Figure  10.   In -basin and out-basin provenances and source-sink pattern of the Upper Enping Member in the Eastern Yangjiang Sag

    表  1   阳江东凹碎屑锆石U-Pb定年测试样品信息

    Table  1   Parameters of detrital zircon U-Pb dating samples of the Eastern Yangjiang Sag

    位置井号层段样品类型取样中深
    /m
    岩性个数
    (谐和度>90%)
    恩平20洼Y20-4恩平组上段岩屑3558细砂岩95
    Y20-5恩平组上段岩屑3378细砂岩98
    恩平21洼Y20-7恩平组上段岩屑3692细砂岩105
    恩平组下段岩屑3979细砂岩110
    Y21-3恩平组下段岩屑3382砂砾岩92
    文昌组二段岩屑3588砂砾岩114
    文昌组三段岩屑3660中砂岩93
    下载: 导出CSV
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出版历程
  • 收稿日期:  2021-07-12
  • 修回日期:  2021-08-24
  • 网络出版日期:  2021-09-16
  • 刊出日期:  2021-12-27

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