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1.
四川类前陆盆地须家河组层序充填样式与油气分布规律 总被引：1，自引：0，他引：1
通过对四川类前陆盆地上三叠统须家河组地表剖面、钻井岩芯和测井资料的沉积相和层序分析,结合区域地质背景和油气地质特征,对须家河组沉积层序、充填样式和油气分布规律进行分析,将须家河组划分为两个超长期旋回层序(SLSC1和SLSC2),分别对应于"须下盆"和"须上盆"2个盆-山耦合次系统的成盆构造活动期,5个长期旋回层序(LSC1—LSC5),分别对应于5个区域性湖进—湖退沉积旋回。在此基础上,选择长期基准面上升和下降半旋回为等时地层单元编制全盆地地层等厚图和岩相古地理图,结果表明:须家河组二段和三段沉降-沉积中心位于川西坳陷,须四段开始向川东北方向迁移,须五段—须六段迁移至川东北坳陷;不同的沉积演化阶段和前缘坳陷具有不同的层序充填样式和油气分布规律;伴随"须下盆"和"须上盆"2个盆-山耦合次系统的沉降-沉积中心和优越的生、储、盖组合条件自川西坳陷向川东北坳陷迁移,油气藏分布也具有自南向北再折向北东方向迁移和围绕前陆隆起带发育的特点。 相似文献
2.
为了进一步认识四川盆地须家河组的层序格架和时空分布,基于高分辨率层序地层学及沉积学相关理论,通过露头剖面、钻井岩心的观察及测井、地震等资料的分析,开展了四川盆地须家河组层序地层研究,结果发现盆地内虽然具有构造复杂、物源多样、岩相不均、组名不统一的特点,但依然具有全盆地范围内可追溯的不整合面和湖泛面。通过层序界面追踪及沉积旋回分析,将四川盆地须家河组划分为3个超长期基准面旋回、6个长期基准面旋回及21个中期基准面旋回,并建立了盆地内各级旋回的对比关系。通过全盆地对比结果表明,须家河组在南北方向上各级旋回个数变化不大,沉积厚度相对稳定;东西方向上旋回变化复杂,西部缺失LSC6旋回和大部分LSC5旋回,东部则缺失大部分LSC1旋回,由于沉降与沉积中心位于龙门山前缘坳陷,盆地近西部沉积速率极高,整体的沉积体展布呈现西厚东薄的楔形体形态特征。在层序对比研究的基础上,尝试性地建立了年代地层格架,通过层序地层学与年代地层学、古生物地层学的综合对比,推测了各旋回的相对年龄值以及不整合面的沉积间断时间,为四川盆地须家河组下一步油气资源探勘开发提供了理论支持。 相似文献
3.
提要: 以野外剖面、钻井岩心、测井资料、薄片鉴定和古生物特征分析为基础, 结合区域地质特征和前人研究成果, 对川东垫江地区须家河组沉积?层序特征进行了较为深入的研究和层序界面及洪泛面的识别, 结果表明: 须一段属于有障壁海岸沉积体系, 须二—须六段地层发育湖泊?辫状河三角洲沉积体系; 可将研究区内须家河组划分为于全盆地范围内可追踪对比的、分别相当“须下盆”和“须上盆”的2个构造层序及对应于须一至须六段的6个长期旋回层序(LSC1~LSC6); 以长期旋回层序界面和洪泛面为等时地层对比标志, 建立了川中隆起—川东南坳陷等时地层格架; 选择各长期旋回层序为等时地层单元编制层序?岩相古地理图, 解析须家河组各时期岩相古地理特征及相带展布规律。研究成果对指导川东地区须家河组油气勘探有重要意义。 相似文献
4.
《中国地质》2015,(4)
以野外剖面、钻井岩心、测井资料、薄片鉴定和古生物特征分析为基础,结合区域地质特征和前人研究成果,对川东垫江地区须家河组沉积-层序特征进行了较为深入的研究和层序界面及洪泛面的识别,结果表明:须一段属于有障壁海岸沉积体系,须二一须六段地层发育湖泊-辫状河三角洲沉积体系;可将研究区内须家河组划分为于全盆地范围内可追踪对比的、分别相当"须下盆"和"须上盆"的2个构造层序及对应于须一至须六段的6个长期旋回层序(LSC1~LSC6);以长期旋回层序界面和洪泛面为等时地层对比标志,建立了川中隆起—川东南坳陷等时地层格架;选择各长期旋回层序为等时地层单元编制层序-岩相古地理图,解析须家河组各时期岩相古地理特征及相带展布规律。研究成果对指导川东地区须家河组油气勘探有重要意义。 相似文献
5.
川西前陆盆地须家河期高分辨率层序格架与古地理演化 总被引：6，自引：1，他引：6
结合钻井岩心、测井、野外露头等地质资料以及前人的研究成果,对川西前陆盆地须家河期的沉积特征及古地理演化进行详细研究,依据高分辨率层序地层学理论,建立了层序地层格架,将川西前陆盆地须家河期划分为2个超长期(SLSC1—SLSC2)、3个长期(LSC1—LSC3)、5个中期(MSC1—MSC5)和数十个短期旋回层序。它们在高分辨率层序格架中的岩相古地理特征及演化为:LSC1期为川西前陆盆地形成初期,地层以海相—海陆过渡相沉积为主;LSC2期为湖泛期,同时随着龙门山岛链的逐渐闭合,主要发育湖相—三角洲相沉积;LSC3期为湖盆衰退期,此时龙门山岛链已完全闭合,以湖相和三角洲相沉积为主。 相似文献
6.
四川盆地上三叠统须家河组油气勘探开始于20世纪40年代,其中须二段、须四段、须六段是主要勘探目的层段,也是盆地周边地区寻找新气源最有利层位之一。根据钻井岩心观察、野外剖面实测和室内镜下岩石薄片鉴定分析,并结合岩石学、测井及地震等沉积相标志研究,确定大川中地区须家河组主要发育扇三角洲、辫状河三角洲和湖泊等沉积相带,进一步划分出若干亚相和微相。利用高分辨率层序地层学理论和技术,在须家河组识别出2个超长期和5个长期基准面旋回层序。以沉积学理论为指导,选择各长期旋回层序为等时地层单元编制四川盆地层序—岩相古地理图。编图结果表明,须家河组5个长期岩相古地理沉降中心、迁移方向和沉积相带的展布严格受龙门山和米仓山—大巴山两造山带非同步的构造格局控制。 相似文献
7.
川东北类前陆盆地须家河组盆 山耦合过程的沉积 层序特征 总被引：4，自引：0，他引：4
根据层序界面识别和沉积序列综合分析,将川东北地区须家河组划分为2个超长期和5个长期基准面旋回层序。此二个级别的层序结构和演化序列,较为清晰地反映了川东北前陆盆地晚三叠世须家河期盆山耦合过程,特点为：须二段—须三段“下成盆”期米仓山大巴山造山带以低幅隆升为主,对应的川东北坳陷沉降幅度小,物源供给与可容纳空间增长率稳定和基本持平,以发育辫状河三角洲湖泊沉积体系为主,其层序结构以上升与下降相域厚度近于相等的对称型为主,反映地层基准面相对稳定和均衡的盆山耦合过程;须四段—须六段“上成盆”期米仓山大巴山开始进入强烈逆冲推覆和构造隆升阶段,川东北前陆盆地坳陷幅度急剧加大,碎屑物供给量骤然和增多至远大于可容纳空间增长率,以发育冲积扇扇三角洲辫状河三角洲等粗碎屑岩为主的沉积体系为主,其层序结构以上升相域厚度大于下降相域的不完全对称型,在造山带前缘则以发育仅保留上升半旋回沉积记录的非对称型结构为主,反映地层基准面升、降变化大的非均衡盆山耦合过程。 相似文献
8.
川东北类前陆盆地须家河组盆-山耦合过程的沉积-层序特征 总被引：17，自引：2，他引：15
根据层序界面识别和沉积序列综合分析,将川东北地区须家河组划分为2个超长期和5个长期基准面旋回层序.此二个级别的层序结构和演化序列,较为清晰地反映了川东北前陆盆地晚三叠世须家河期盆-山耦合过程,特点为:须二段-须三段"下成盆"期米仓山-大巴山造山带以低幅隆升为主,对应的川东北坳陷沉降幅度小,物源供给与可容纳空问增长率稳定和基本持平,以发育辫状河三角洲-湖泊沉积体系为主,其层序结构以上升与下降相域厚度近于相等的对称型为主,反映地层基准面相对稳定和均衡的盆-山耦合过程;须四段-须六段"上成盆"期米仓山-大巴山开始进入强烈逆冲推覆和构造隆升阶段,川东北前陆盆地坳陷幅度急剧加大,碎屑物供给量骤然和增多至远大于可容纳空间增长率,以发育冲积扇-扇三角洲-辫状河三角洲等粗碎屑岩为主的沉积体系为主,其层序结构以上升相域厚度大于下降相域的不完全对称型,在造山带前缘则以发育仅保留上升半旋回沉积记录的非对称型结构为主,反映地层基准面升、降变化大的非均衡盆-山耦合过程. 相似文献
9.
川东北前陆盆地须家河组层序-岩相古地理特征 总被引：27，自引：3，他引：24
根据控制高分辨率层序的构造和天文因素将川东北前陆盆地晚三叠世须家河期划分为2个超长期、5个长期、18个中期及数十个短期旋回层序,并分析了须家河组超长期层序的岩相古地理特征与演化.在SLSC1超长期旋回时期,米仓山-大巴山构造山系尚处于低幅稳定隆升状态,而龙门山构造山系的逆冲推覆作用较为活跃,川东北前陆盆地属于受龙门山逆冲推覆作用远端效应影响的前陆斜坡,沿米仓山-大巴山前缘地带主要发育辫状河三角洲沉积,而盆地西南部主要发育浅湖沉积.在SLSC2超长期旋回时期,龙门山逆冲推覆进一步增强,同时,米仓山-大巴山开始进入逆冲推覆前的强烈构造隆升阶段,川东北前陆盆地有较大幅度的持续拗陷沉降,在继承SLSC1古地理演化的基础上,形成了以沿龙门山和米仓山-大巴山两逆冲推覆带前缘广泛发育的、以巨厚块状砾岩为特征的大型冲积扇沉积体系. 相似文献
10.
中国中西部前陆盆地大多具有陆内俯冲造山形成的特点,层序地层学在这类前陆盆地中的应用是一个值得研究的新领域。对川北前陆盆地上三叠统须家河组5条露头剖面和1条测井剖面进行详细沉积相分析和层序地层划分,同时阐述了沉积相迁移规律、层序界面类型、层序发育特征及基准面变化;将川北前陆盆地上三叠统须家河组划分为4个三级层序(TS1,TS2,TS3和TS4)。大竹、开江一带须家河组沉积厚度为400～600m,4个层序发育完整;向北东至万源一带地层变薄至100余m,保存残留不全的须家河组只能归为1个三级层序(TS4)。在露头剖面和测井剖面层序地层划分的基础上建立的层序地层格架表明:TS1—TS2以曲流河及曲流河三角洲沉积体系为主,盆地处于稳定坳陷和慢速充填的欠补偿状态,TS3—TS4以冲积扇、辫状河及辫状河三角洲沉积体系为主,盆地处于强烈坳陷和快速充填的过补偿状态。沉积相的时空叠置样式受北部秦岭造山带构造活动的制约作用较为明显。 相似文献
11.
四川盆地上三叠统构造层序划分及盆地演化 总被引：3，自引：0，他引：3
晚三叠世是四川盆地演化的重要时期。根据野外露头、钻井和地震资料,运用构造层序地层学的思路和方法,对四川盆地上三叠统层序界面、层序划分和层序特征进行深入研究,并建立层序地层格架。研究表明,四川盆地上三叠统可识别出4个层序界面:1)上三叠统与中、下三叠统之间的区域性构造不整合面;2)须二段与小塘子组的分界面;3)须三段与须四段之间的次级构造不整合面;4)三叠系与侏罗系之间的区域性构造不整合面。根据层序界面的发育情况,将研究区划分为3个构造层序,每个层序以最大湖泛面为界,划分为盆地扩张体系域(BE)和盆地收缩体系域(BW)2个体系域。晚三叠世四川盆地的演化主要是川西前陆盆地的演化,其中TS1为边缘前陆盆地演化阶段;TS2为川西前陆盆地形成阶段,龙门山逆冲推覆体开始逆冲推覆;TS3为川西前陆盆地发展阶段,受安县运动的影响,龙门山逆冲褶皱成山,使得整个四川盆地进入了陆相沉积环境。构造运动是控制晚三叠世四川盆地演化的重要因素。 相似文献
12.
四川类前陆盆地须家河组震积岩的发现及其研究意义 总被引：3，自引：0，他引：3
四川盆地是扬子地块上的一个多旋回类前陆盆地,盆地边缘长期剧烈的构造活动控制着上三叠统须家河组的沉积作用.通过地表剖面和岩芯观察,首次在该盆地上三叠统须家河组地层中识别出微裂缝、微褶皱层、微断层、液化砂岩构造、球一枕构造和角砾岩等典型的软沉积变形构造的地质记录,这些变形构造可能与印支构造运动期的地震活动有关.越靠近断裂带附近,软变形构造呈明显增加的趋势,表明震积岩的分布与龙门山和米仓山一大巴山构造活动有关.因此,研究该盆地须家河组震积岩,对了解控制盆地边界的龙门山和米仓山一大巴山造山带的活动史具有重要意义. 相似文献
13.
Intracontinental subduction of the South China Block below the North China Block in the Late Triassic resulted in formation of the transpressional Sichuan foreland basin on the South China Block. The Upper Triassic Xujiahe Formation was deposited in this basin and consists of an eastward-tapering wedge of predominantly continental siliciclastic sedimentary rocks that are up to 3.5 km thick in the western foredeep depocenter and thin onto the forebulge and into backbulge depocenters.Five facies associations (A–E) make up the Xujiahe Formation and these are interpreted, respectively, as alluvial fan, transverse and longitudinal braided river, meandering river, overbank or shallow lacustrine, and deltaic deposits. This study establishes a sequence stratigraphic framework for the Xujiahe Formation which is subdivided into four sequences (SQ1, 2, 3 and 4). Sequence boundaries are recognized on the basis of facies-tract dislocations and associated fluvial rejuvenation and incision, and systems tracts are identified based on their constituent facies associations and changes in architectural style and sediment body geometries. Typical sequences consist of early to late transgressive systems tract deposits related to a progressive increase in accommodation and represented by Facies Associations A, B and C that grade upwards into Facies Association D. Regionally extensive and vertically stacked coal seams define maximum accommodation and are overlain by early highstand systems tract deposits represented by Facies Associations D, E and C. Late highstand systems tract deposits are rare because of erosion below sequence boundaries. Sequence development in the Xujiahe Formation is attributed to active and quiescent phases of thrust-loading events and is closely related to the tectonic evolution of the basin. The Sichuan Basin experienced three periods of thrust loading and lithospheric flexure (SQ1, lower SQ2 and SQ3), two periods of stress relaxation and basin widening (upper SQ 2 and SQ3) and one phase of isostatic rebound (SQ4). Paleogeographic reconstruction of the Sichuan Basin in the Late Triassic indicates that the Longmen Mountains to the west, consisting of metamorphic, sedimentary and pre-Neoproterozoic basement granitoid rocks, was the major source of sediment to the foredeep depocenter. Subordinate sediment sources were the Xuefeng Mountains to the east to backbulge depocenters, and the Micang Mountains to the northwest during the late history of the basin. This study has demonstrated the viability of sequence stratigraphic analysis in continental successions in a foreland basin, and the influence of thrust loading on sequence development. 相似文献
14.
The early stage of Sichuan Basin formation was controlled by the convergence of three major Chinese continental blocks during the Indosinian orogeny that include South China,North China,and Qiangtang blocks.Although the Late Triassic Xujiahe Formation is assumed to represent the commencement of continental deposition in the Sichuan Basin,little research is available on the details of this particular stratum.Sequence stratigraphic analysis reveals that the Xujiahe Formation comprises four third-order depositional sequences.Moreover,two tectono-sedimentary evolution stages,deposition and denudation,have been identified.Typical wedge-shaped geometry revealed in a cross section of the southern Sichuan Basin normal to the Longmen Shan fold-thrust belt is displayed for the entire Xujiahe Formation.The depositional extent did not cover the Luzhou paleohigh during the LST1 to LST2 （LST,TST and HST mean Iowstand,transgressive and highstand systems tracts,1,2,3 and 4 represent depositional sequence 1,2,3 and 4）,deltaic and fluvial systems fed sediments from the Longmen Shan belt,Luzhou paleohigh,Hannan dome,and Daba Shan paleohigh into a foreland basin with a centrally located lake.The forebulge of the western Sichuan foreland basin was located southeast of the Luzhou paleohigh after LST2.According to the principle of nonmarine sequence stratigraphy and the lithology of the Xujiahe Formation,four thrusting events in the Longmen Shan fold-thrust belt were distinguished,corresponding to the basal boundaries of sequences 1,2,3,and 4.The northern Sichuan Basin was tilted after the deposition of sequence 3,inducing intensive erosion of sequences 3 and 4,and formation of wedge-shaped deposition geometry in sequence 4 from south to north.The tilting probably resulted from small-scale subduction and exhumation of the western South China block during the South and North China block collision. 相似文献
15.
四川盆地是扬子地块上的一个多旋回类前陆盆地,盆地边缘长期剧烈的构造活动控制着上三叠统须家河组的沉积作用。通过地表剖面和岩芯观察,首次在该盆地上三叠统须家河组地层中识别出微裂缝、微褶皱层、[JP2]微断层、液化砂岩构造、球—枕构造和角砾岩等典型的软沉积变形构造的地质记录,这些变形构造可能与印支构造运动期的地震活动有关。越靠近断裂带附近,软变形构造呈明显增加的趋势,表明震积岩的分布与龙门山和米仓山—大巴山构造活动有关。因此,研究该盆地须家河组震积岩,对了解控制盆地边界的龙门山和米仓山—大巴山造山带的活动史具有重要意义。 相似文献
16.
Liang Luo Jia-Fu Qi Ming-Zheng Zhang Kai Wang Yu-Zhen Han 《International Journal of Earth Sciences》2014,103(6):1553-1568
Upper Triassic to Upper Jurassic strata in the western and northern Sichuan Basin were deposited in a synorogenic foreland basin. Ion–microprobe U–Pb analysis of 364 detrital zircon grains from five Late Triassic to Late Jurassic sandstone samples in the northern Sichuan Basin and several published Middle Triassic to Middle Jurassic samples in the eastern Songpan–Ganzi Complex and western and inner Sichuan Basin provide an initial framework for understanding the Late Triassic to Late Jurassic provenance of western and northern Sichuan Basin. For further understanding, the paleogeographic setting of these areas and neighboring hinterlands was constructed. Combined with analysis of depocenter migration, thermochronology and detrital zircon provenance, the western and northern Sichuan Basin is displayed as a transferred foreland basin from Late Triassic to Late Jurassic. The Upper Triassic Xujiahe depocenter was located at the front of the Longmen Shan belt, and sediments in the western Sichuan Basin shared the same provenances with the Middle–Upper Triassic in the Songpan–Ganzi Complex, whereas the South Qinling fed the northern Sichuan Basin. The synorogenic depocenter transferred to the front of Micang Shan during the early Middle Jurassic and at the front of the Daba Shan during the middle–late Middle Jurassic. Zircons of the Middle Jurassic were sourced from the North Qinling, South Qinling and northern Yangtze Craton. The depocenter returned to the front of the Micang Shan again during the Late Jurassic, and the South Qinling and northern Yangtze Craton was the main provenance. The detrital zircon U–Pb ages imply that the South and North China collision was probably not finished at the Late Jurassic. 相似文献
17.
Jinxing Dai Yunyan Ni Caineng Zou Shizhen Tao Guoyi Hu Anping Hu Chun Yang Xiaowan Tao 《Organic Geochemistry》2009,40(5):638-646
The Upper Triassic Xujiahe Formation in the Sichuan Basin, SW China consists of a series of coal measures. The first, third and fifth members of this formation are dominated by gas prone dark mudstones and coals. The mudstones contain Type II and III kerogens with average organic carbon contents around 1.96%. These source rocks are mature in the central Sichuan and highly mature in the western Sichuan Basin, characterized by gas generation with subordinate amounts of light oil or condensate oils. The source rocks are intercalated with the sandstone dominated second, fourth and sixth members of the Xujiahe Formation, thus leading to three separate self contained petroleum systems in the region. The proven gas reserves in the Xujiahe Formation are only less than that of the Triassic Feixianguan Formation and the Xujiahe Formation has the second largest gas field (Guang’an gas field) in the basin. Gases derived from the Xujiahe Formation coals generally show a normal stable carbon isotopic trend for C1–C4 n-alkanes, with the highest δ13C2 values among the nine gas pay zones in the basin (?20.7‰ to ?28.3‰), and δ13C1 values as low as ?43.0‰ in the central Sichuan. Gas accumulations with an oil leg have also been found in the eastern and southern Sichuan where the thickness of the Xujiahe Formation is significantly reduced. Gases in these accumulations tend to show low δ13C2 values (?30.0‰ to ?36.3‰), characteristic of oil prone source rocks. 相似文献