Extension of the Louzidian Metamorphic Core Complex and Development of Supradetachment Basins in Southern Chifeng,Inner Mongolia,China

The Louzidian metamorphic core complex (LMCC) in southern Chifeng is located on the northern margin of the North China craton. Structural analyses of the LMCC and its extensional detachment system indicate that the LMCC experienced two-stage extension. The ductile regime experienced top-to-northeast shearing extension and the brittle detachment fault underwent top-down-outwards slipping. Between these two stages, a semi-ductile regime recorded the transition from ductile to brittle. The hanging wall of the detachment fault is similar to those classic supradetachment basins in western North America. Analyses of provenance and paleocurrent directions in the basins show that there were two filling stages. In the early stage, materials came from the southwest margin of the basin and the hanging wall of the detachment system and were transported from southwest to northeast; while in the late stage, deposits were derived from the footwall of the detachment fault and transported outwards to the two sides of the core complex. Since the filling period of the basins is from the late Jurassic to the late Cretaceous and it is coeval with the extension, the two filling stages reflect the two-stage history of the detachment fault. The large-scale late Jurassic underplating in the deep crust of the Chifeng area led to thickening and heating of the middle-upper crust and trigged the extension at depths and volcanism on the surface. In the early Cretaceous the upper plate of the detachment fault moved northeastwards and sediments were transported from southwest to northeast, while in the late Cretaceous the core complex was uplifted rapidly, the original basin was separated by the uplifted core, and lower-plate-derived debris was deposited in the adjacent upper-plate basins of the detachment fault. Evidentially, the development of the supradetachment basins were controlled by the extension and in turn the fillings in the basins recorded information of the extension, which has provided new evidence for kinematic interpretation of the Louzidian core complex.

Petrologic characteristics and genesis of dolostone from the Campanian of the SK-I Well Core in the Songliao Basin,China

The well SK-I in the Songliao Basin is the first scientific borehole targeting the continental Cretaceous strata in China. Oval concretions, thin laminae and beds of dolostone are found intercalated within mudstone and organic-rich black shale in the Nenjiang Formation of Campanian age. Low ordered ferruginous dolomite is composed of euhedral--subhedral rhombs with cloudy nucleus and light rims formed during the diagenesis, which are typical features of replacement. The heavy carbon isotopes （δ13CPDB -- 1.16-16.0） are results of both the fermentation of organic matter by microbes and degassing of carbon dioxide during the period of diagenesis, and the presence of light oxygen isotopes （δ18OPDB- 18.53--5.1） is a characteristic feature of fresh water influence which means the carbonate may have been altered by ground water or rainwater in the late diagenesis. Marine water incursions into the nor- mally lacustrine basin have been proved by both the salinity of Z value and the occurrence of foraminifera in the same strata where dolomite occurs. Pyrite framboids observed by SEM are usually enclosed in the dolomite crystals or in the mudstones, supporting the sulfate reducing bacteria （SRB）. The formation of both dolomite and pyrite are associated with marine water incursions, which not only supply magnesium ion for dolomite, but also result in limited carbonate precipitation in the basin. The presence of pyrite framboids indicates the development of an anoxic environment associated with salinity stratification in the lake. The dolomite in the Nenjiang Formation is the results of marine water incursions, diagenetic replacement of calcareous carbonate and sulfate reducing bacteria （SRB）.

Geochemical characteristics and their significances of rare-earth elements in deep-water well core at the Lingnan Low Uplift Area of the Qiongdongnan Basin

A geochemical analysis of rare-earth elements （REEs） in 97 samples collected from the core of deep-water Well LS-A located at the Lingnan Low Uplift Area of the Qiongdongnan Basin is conducted, with the pur-pose of revealing the changes of sedimentary source and environment in the study region since Oligocene and evaluating the response of geochemical characteristics of REEs to the tectonic evolution. In the core samples, both∑REE and∑LREE （LREE is short for light-group REEs） fluctuate in a relatively wide range, while∑HREE （HREE is short for heavy-group REEs） maintains a relatively stable level. With the stratigraphic chronology becoming newer, both∑REE and∑LREE show a gradually rising trend overall. The∑REE of the core is relatively high from the bottom of Yacheng Formation （at a well depth of 4 207 m） to the top of Ledong Formation, and the REEs show partitioning characteristics of the enrichment of LREE, the stable content of HREE, and the negative anomaly of Eu to varying degrees. Overall the geochemical characteristics of REEs are relatively approximate to those of China＇s neritic sediments and loess, with significant ＂continental ori-entation＂. The∑REE of the core is relatively low in the lower part of Yacheng Formation （at a well depth of 4 207-4 330 m）, as shown by the REEs partitioning characteristics of the depletion of LREE, the relative enrich-ment of HREE, and the positive anomaly of Eu; the geochemical characteristics of REEs are approximate to those of oceanic crust and basalt overall, indicating that the provenance is primarily composed of volcanic eruption matters. As shown by the analyses based on sequence stratigraphy and mineralogy, the provenance in study region in the early Oligocene mainly resulted from the volcanic materials of the peripheral uplift ar-eas; the continental margin materials from the north contributed only insignificantly; the provenance devel-oped to a certain extent in the late Oligocene. Since the Miocene, the provenance has ceaselessly expanded from proximal to distal realm, embodying a characteristic of multi-source sedimentation. In the core strata with 31.5, 28.4, 25.5, 23, and 16 Ma from today, the geochemical parameters of REEs and Th/Sc ratio have significant saltation, embodying the tectonic movement events in the evolution of the Qiongdongnan Basin. In the tectonic evolution history of the South China Sea, the South China Sea Movement （34-25 Ma BP, early expansion of the South China Sea）, Baiyun Movement （23 Ma BP）, late expansion movement （23.5-16.5 Ma BP）, expansion-settlement transition, and other important events are all clearly recorded by the geochemi-cal characteristics of REEs in the core.

河道型水库沉积物有机碳空间分布特征及其埋藏效应

【目的】河流筑坝对有机碳具有重要的拦截作用,影响内陆水体碳循环。目前,河道型水库沉积物有机碳空间分布特征和自生有机碳埋藏通量仍不明确。【方法】采用沉积物柱芯法、沉积物物理化学参数和碳同位素二元混合模型,对河道型水库(银盘水库)沉积物有机碳埋藏开展了调研。【结果】结果显示:银盘水库沉积物有机碳含量变化范围为0.99%~1.32%,库中和坝前沉积柱有机碳含量均值分别为1.12%和1.16%;内源有机碳与总磷呈现显著正相关;有机碳埋藏速率变化范围为98.7~348.9 g C·m^(-2)·a^(-1),平均值为223.8 g C·m^(-2)·a^(-1),有机碳埋藏通量和内源有机碳埋藏通量分别为2.5×10^(9)g C·a^(-1)和1.8×10^(9)g C·a^(-1);内源有机碳对沉积物总有机碳的贡献比例为69.0%~75.2%,平均值为71.5%。【结论】结果表明:河道型水库沉积柱有机碳含量从库中到坝前没有明显变化;水库内源有机质的生成与营养盐输入和水体滞留时间密切相关;银盘水库有机碳埋藏通量相当于全球水库有机碳埋藏通量的0.04‰,河道型水库是个重要的潜在碳汇。研究结果能够为河道型水库碳埋藏研究和水电清洁型评估提供参考依据。

基于岩心和电成像测井的遗迹组构识别及其地质意义

目的为了查明琼东南盆地松涛隆起三亚组遗迹组构的发育特征,探讨其油气地质意义,方法以琼东南盆地松涛隆起三亚组代表性取心井为研究对象,根据岩心上遗迹化石与围岩发育特征,识别遗迹组构,通过校正岩心和电成像测井的深度,分析各类典型遗迹组构对应电成像测井的响应特征,建立琼东南盆地北部三亚组五类遗迹组构电成像测井识别的参考图版,用于连续电成像测井动态图像上遗迹组构的识别。结果结果表明:(1)研究区岩心和电成像测井图像上识别出5种遗迹组构,即Ophiomorpha-Thalassionides遗迹组构,Palaeophycus遗迹组构,Planolites-Thalassionides遗迹组构,Phycosiphon-Planolites遗迹组构和Phycosiphon-Chondrites遗迹组构;(2)对比南海北部相似沉积环境9口钻井112个层位岩心和电成像图像上识别出的遗迹组构,二者有104个层位完全吻合,识别准确度可达92.9%(8个层位因电成像质量较差,识别结果不一致),说明基于岩心和电成像测井识别琼东南盆地松涛隆起三亚组遗迹组构结果可靠、效果良好。结论该项研究对分析研究区储层的(古)沉积环境、预测其分布规律,揭示(古)生物对油气储层的改造机制具有重要意义。

柴西咸水泉地区下油砂山组湖相沉积特征——以咸东1井取心段为例

【目的】勘探实践表明,柴达木盆地剩余油主要集中于西部地区,但受复杂地表及低渗储层的影响,勘探程度相对较低。为提高柴西咸水泉地区地质认识,可进一步加快油气勘探。【方法】基于岩心沉积构造,结合岩石薄片、X衍射全岩分析化验和地震反射等资料,对咸东1井上新统下油砂山组取心段的沉积相进行综合研究。【结果与结论】(1)深灰—灰黑色灰质泥页岩中夹有灰色薄—中层块状层理细杂砂岩,砂体顶、底部与泥岩突变接触,底界面为明显凸凹不平的侵蚀面,侵蚀面之下的泥页岩中变形层理发育,砂体为沉积物再搬运的砂质碎屑流沉积;(2)深灰—灰黑色灰质泥页岩中夹有含介壳—陆源碎屑的砾屑灰岩和具明显变形层理的粉砂岩及粉砂质团块,其变形纹层清晰且具明显的变形方向,为滑塌碎屑沉积;(3)深灰—灰黑色灰质泥页岩主要夹有薄层灰色含云灰黏土质粉砂岩,泥页岩中发育水平层理及韵律层理等,粉砂岩中发育较多泥质纹层的小型单斜层理、上攀波痕纹理及厚互层层理,为半深—深湖沉积夹由沉积物重力流末期演变的较弱底流沉积。此外,盆地发育的不同时期在阿尔金山前较深水区可能具备发育类似咸东1井滑塌—沉积物重力流沉积储层的条件,尚需进一步研究。

泥河湾盆地马圈沟遗址鱼咀沟1号地点2017-2018年发掘出土的石制品

马圈沟遗址鱼咀沟1号地点位于泥河湾盆地东缘,大田洼台地的北坡,为该遗址最北的一处地点,2017-2018年发掘80 m2,发现7个文化层、4个化石层,发现207件石质标本和一部分动物化石。石制品152件,类型包括石锤、石核、石片、石器、残废品以及备料等,其中石器包括刮削器、凹缺器、尖状器、钻器、砍砸器等,具有中国北方小石器工业的典型特征。原料主要为燧石(39.6%),其次是白云岩(27.5%)与硅质灰岩(19.3%),最后是玄武岩等其他岩类(13.6%)。遗址埋藏于早更新统泥河湾组的地层内,第4、第7文化层分别与马圈沟遗址第I、第III文化层对应,年代分别为距今155万年、166万年,整体年代处于距今166-150万年之间。该地点地层序列清晰,年代古老明确,文化层序众多,文化遗物丰富,进一步丰富了马圈沟遗址早更新世古人类的文化序列,为探索东亚地区早期人类的出现与演化提供了丰富的资料。

Typical Soft–Sediment Deformation Structures Induced by Freeze/Thaw Cycles: A Case Study of Quaternary Alluvial Deposits in the Northern Qiangtang Basin, Tibetan Plateau

With the objective of establishing a distinction between deformation structures caused by freeze/thaw cycles and those resulting from seismic activity, we studied three well–exposed alluvial deposits in a section at Dogai Coring, northern Qiangtang Basin, Tibetan Plateau. Deformation is present in the form of plastic structures(diapirs, folds and clastic dykes), brittle structures(micro–faults) and cryogenic wedges. These soft–sediment deformation features(except the micro–faults) are mainly characterized by meter–scale, non–interlayered, low–speed and low–pressure displacements within soft sediments, most commonly in the form of plastic deformation. Taking into account the geographic setting, lithology and deformation features, we interpret these soft–sediment deformation features as the products of freeze/thaw cycles, rather than of earthquake–induced shock waves, thus reflecting regional temperature changes and fluctuations of hydrothermal conditions in the uppermost sediments. The micro–faults(close to linear hot springs) are ascribed to regional fault activity;however, we were unable to identify the nature of the micro–faults, perhaps due to disturbance by subsequent freeze/thaw cycles. This study may serve as a guide to recognizing the differences between deformation structures attributed to freeze/thaw cycles and seismic processes.

花页7井取心工具优选分析

针对苏北盆地阜二段破碎地层取心中存在的单趟取心进尺少、岩心收获率低和取心机械钻速低等技术难点,以花页7井阜二段44次取心为例,分别从取心钻头、取心筒和取心内筒3个方面对花页7井所用取心工具开展效果评价。为保证取心收获率,优选出切削能力、稳定性相对较强的六刀翼8 mm齿径的取心钻头;保证内筒居中,适应不同井斜的苏Ⅲ型取心筒;不易变形、强度高的钢制内筒。最终得出适用于硬、脆、碎性泥页岩地层,取心稳定性强、利于岩心成形的取心工具组合(戴比特/川克六刀翼8 mm齿径取心钻头+苏Ⅲ型+钢制内筒),以提高取心效率,为苏北盆地阜二段地层取心提供参考和技术支持。

致密油田注水吞吐采出程度影响因素实验研究

为探索致密油藏注水吞吐提高采收率影响因素,以鄂尔多斯盆地长8致密油储层为研究对象,开展了长岩心室内吞吐实验,研究了渗透率、闷井时间、注入水量、注水速度、吞吐周期、注入压力对长8致密油储层采出程度的影响因素。结果表明:对于致密油长8储层,基质渗透率影响注水吞吐效果,渗透率越大,注水吞吐采出程度越高;原油与基质中的流体交换效率受油焖井时间影响,焖井时间越长,流体交换越充分,最终采出程度越高,但焖井时间存在临界值;注水量、注水速度是地层能量的有效补充,影响吞吐的最终采出程度,注水速度越低,越容易发挥毛细管力的渗吸作用,吞吐效果越好,注水量存在临界值,超过临界值后容易形成优势通道,影响采出效果;注入压力影响岩心内部渗吸作用发生的范围,从而影响最终采出程度,注入压力越高,注入水进入的孔隙越多,渗吸发生的范围越大,吞吐效果越好。研究成果对致密油高效补充能量开发提供借鉴。

PALEOCLIMATIC CHANGES DURING THE LAST 2.5Ma RECORDED IN THE KATHMANDU BASIN, CENTRAL NEPAL HIMALAYAS

The Kathmandu valley is an intermountain basin located at about 1300 and surounded by mountains around 2400m.Thick fluvio\|lacustrine sediments from late Pliocene to Quaternary are accumulated there under monsoon climate.We undertook palynological and sedimentological studies on 284\|m\|long drilled core that reaches the basement of the kathmandu basin,in order to clarify the paleoclimatic changes and their tectonic link with uplifting of the Himalayas..The core is lithologically divided into three members:sand predominant lower member (51m),slit and clay dominant middle member (182m) and organic silty clay predominant upper member (45m).We analyzed fossil pollens contained in muddy samples which were taken from the middle and upper member in every one meter interval.The pollen assemblage is characterized by predominance of \%Quercus,\%30%～80% of the all arboreal pollen.We inferred paleoclimatic changes on the basis of comparison between present vegetation and climate of Kathmandu valley and surrounded mountains and pollen diagram which we obtained.For the purpose of inference of paleoclimate,we used the following genera as climatic index:\%Pinus\% for cold climate, \%Quercus\% and \%Cyclobalanopsis\% for warm climate, Alnus for wet climate and Gramineae for dry climate.As the reference.we also examined amount of another eight genera,two family and all spores.The pollen diagram shows two pattern of paleoclimatic changes:oscillation pattern with seven times fluctuation of warm and cold climate in younger period (ca.115m in depth),and older less fluctuated pattern of warm climate.During the older period (209～215m in depth),one cold stage was recognized,and is characterized by predominance of Pinus and occurrence of Tsuga .

三河与中国早期王都

司马迁在《史记·货殖列传》中所称“三河”,是指今天流经山西、河南境内的黄河中下游地区。河东位于今山西南部,襄汾陶寺遗址早期约早出夏代一二百年,或当传说中尧、舜、禹时期,陶寺中晚期已在夏代纪年范围之内,此时正是早期国家形成阶段;河内即今太行山东南麓为古黄河所环绕的地区,历史上为商人的主要活动区域;河南指晋、豫两省黄河以南,周公在此营洛邑,即成周与王城,是周人活动的主要区域。河东、河南、河内三个区域既成相对独立区域,又以黄河相连接,为当时“天下之中”“王者所更居”之地。夏、商、周三代王朝的更替与发展壮大都没有离开过古老的黄河流域,从这个角度看,夏、商、周三代中国早期国家的诞生不仅是黄河与黄河文化的馈赠,同时也把中国历史与中华民族的发展推进到了新的阶段。黄河中下游流域龙山时代形成的文化成果为夏、商、周三代早期国家的诞生奠定了坚实的文化基础,成为夏、商、周三代文明的始原。龙山时代之后不久,在黄河中下游地区诞生了中国历史上最早的国家形态和中华民族的雏形——华夏族。

不同移栽期对昭通金沙江流域雪茄烟茄芯烟叶产质量影响

以茄芯品种云雪39号为试验材料,设置2022年4月中旬、4月下旬及5月上旬3个不同移栽期的对比试验,研究了不同移栽期对云雪39号的生育期、植物学性状、农艺性状、抗病性、烟叶外观质量、化学成分及产质量的影响。结果表明:云雪39号于4月下旬移栽的田间农艺性状最优,田间自然发病率最低,鲜烟叶产值和晾制后产量最高,分别为127581.20元/hm2和2046.70 kg/hm2,晾制后烟叶化学成分含量与国内外优质茄芯烟叶含量接近,且冷杉醇的含量最高,达到0.12 mg/g。因此,昭通市金沙江流域雪茄烟茄芯品种云雪39号的最佳移栽期为4月下旬较为适宜。

筇竹寺组高角度裂缝储层取心复杂处理技术

川南地区页岩气井下寒武统筇竹寺组是长宁—威远国家级页岩气示范区勘探开发与产能建设重要的接替地层。Z201井在筇竹寺地层开展取心作业,面临高角度楔形裂缝发育、分布点多、井段长的地质复杂情况,取心起钻完采用常规敲击方式时出现了地面出心困难的技术难题,严重影响取心作业的质量与效率。针对上述问题,围绕敲击效果提升与敲击力控制方法,自主设计研发了快速出心工具,并形成了配套处理技术:①改变敲击位置,缩短敲击点与堵点岩心距离,增加震动效果;②优化工具结构,扩大敲击接触面,减少震动应力,控制对取心筒的伤害;③优化作业工艺,精准控制敲击力,强化使用后的检验、维护、保养,减少对取心筒的损伤。现场应用中,Z201井筇竹寺地层完成14趟取心作业,取心进尺171.50 m,心长170.50 m,取心收获率高达99.42%,岩心完整率100%,取心筒完好率100%。

利用古地磁学方法恢复钻孔岩心原始方位可靠性的探讨:以塔里木盆地钻井为例

针对非定向钻孔岩心原始方位难以确定的科学问题,利用塔里木盆地5口钻井(TKQ101井、SHUN9井、TAT19井、TZ18井和TS108井)志留纪无定向砂岩样品,对典型样品进行了岩石磁学、扫描电镜(SEM)和能谱分析(EDS)等实验,明确了样品的主要载磁矿物,之后对43块样品进行了退磁处理,并分析了校正后的磁化率各向异性(AMS)最大轴(K_(max)轴)指示的古水流方向,探讨了利用剩磁恢复岩心原始方位的可靠性。AMS结果揭示的沉积组构支持整个钻孔回次地层近似水平;岩石磁学、SEM和EDS实验结果表明TKQ101井样品主要载磁矿物为磁铁矿、含有少量针铁矿和赤铁矿,其他钻井样品主要载磁矿物为磁黄铁矿和磁铁矿。43块样品的系统退磁实验结果显示,TKQ101井岩心样品可分离出可靠的现代场黏滞剩磁方向(VRM)和志留纪地层原生剩磁方向(ChRM),经VRM和ChRM各自计算获得岩心原始方位旋转量(R,R′,其中R,R′分别为利用VRM和ChRM磁偏角获得的岩心原始方位旋转量)一致,校正后的K_(max)指示的古水流方向也与地质证据相吻合,支持TKQ101井岩心原始标志线方位需逆时针旋转258.0°~262.0°;其他4口钻井岩心退磁结果呈现单分量特征,综合分析明确其经历了由喜山期油气运移、聚集等流体活动导致的化学重磁化,携带的剩磁为现代地磁场的黏滞剩磁和喜山期重磁化成分叠加结果。通过校正后K_(max)轴指示的古水流方向和地质证据验证后,揭示利用VRM获得的恢复岩心原始方位旋转量R较为可靠。综上,钻井岩心原始方位恢复需要旋转的角度如下:TKQ101井岩心在逆时针旋转258.0°~262.0°后即可获得可靠的原始标志线方位;SHUN9井第4,5,6回次岩心标志线的方位需分别逆时针旋转148.1°,221.2°和318.2°;TAT19钻井第3,5回次岩心标志线的方位需分别逆时针旋转269.8°,155.9°;TS108井和TZ18井岩心标志线的方位需分别逆时针旋转239.3°,256.6°。

珠江口盆地开平凹陷油气地质新认识与勘探突破

珠江口盆地开平凹陷历经40年勘探,长期未能实现勘探突破。针对成盆机制及洼陷结构、烃源发育层段和分布范围、成藏规律这3方面,通过精细地震解释、烃源岩评价、成藏综合分析等研究,取得了新认识。研究认为:(1)开平凹陷具有“拆离-核杂岩”型成盆机制及“早断陷—中拆离—晚断坳转换”演化特征;(2)文三段和文四段是主力烃源岩发育层段,优质烃源岩主要分布在开平主洼、开平西洼以及开平东洼;(3)开平主洼缓坡带具有“源-断-储”三元耦合成藏模式,是油气勘探有利区带。认识指导勘探,2022年获得了开平11-4油田重要发现,实现了开平南部斜坡带勘探突破。

稀油油藏密闭取心流体饱和度校正方法

针对吐哈盆地稀油油藏地层条件下的流体饱和度,以温米油田和鄯善油田丰富的密闭取心资料为基础,通过物理模拟对照实验,模拟取心过程中降压、脱气、蒸发损失等对岩心流体饱和度的影响,建立了适用于吐哈盆地稀油油藏的密闭取心流体饱和度校正模型。明确了降压脱气损失界限,即初始含水饱和度大于88%或小于33%时,降压脱气损失微弱,可忽略不计。新模型还考虑了孔隙体积变化、饱和度实验抽提损失以及不同水淹条件下的蒸发损失对饱和度测量的影响,有效提高了校正精度,与测井解释含油饱和度比较,误差为0.17%。

四川盆地五百梯地区长兴组生物礁发育特征及测井响应模式

为进一步厘定四川盆地五百梯地区长兴组生物礁发育的特征以及响应模式,通过运用岩心、薄片和测井曲线等资料,对川东五百梯长兴组生物礁发育模式进行了系统的探究和总结,明确了研究区生物礁具有“纵向叠置,横向迁移”的规律,生物礁期次由西向东逐渐递减;在此基础上建立了地质-测井一体化的生物礁响应模式。基于分析认为在川东五百梯生物礁亚相中,礁基对应的测井相为漏斗型、礁核对应的测井相为箱型、礁盖对应的测井相为钟型,其中“礁核+礁盖”对应的C型为储层最为发育的测井相响应模式。

广花盆地岩溶强发育地区工程桩基钻芯法检测异常原因分析及改进措施

以广花盆地某岩溶区工程为例,分析了场地岩溶发育的基本规律,指出当场地大溶洞和多层溶洞十分发育时,勘察仅依靠简单的钻探手段很难给设计提供准确的岩溶分布信息,从而导致后续钻芯法检测结果出现异常。因此,建议面对类似岩溶强发育场地时,勘察应多结合使用物探手段以扩大探测范围;设计人员应将补充勘察的重点探测范围扩大到不小于10 m;检测前应先结合勘察数据进行分析,然后再优先选取风险较高的桩基进行检测,且宜适当提高钻芯法检测比例。

福州盆地MIS 3以来海侵层分布特征及指示盆地内部构造活动

福州盆地晚第四纪海侵-海退研究在近几十年内获得了较多的成果积累,已证实淤泥层可作为海侵活动的标识层。海侵层除了能够指示海平面上升,其在盆地内部的分布特征能够反演其沉积后期经历的构造活动。本研究在前人的基础上,收集了盆地内不同位置913根钻孔岩芯资料,分别提取全新世与MIS 3两次海侵层层顶、层底埋深、厚度以及现代地表高程等参数,对其进行相关性分析,并将两期次海侵层的厚度和层底埋深利用ArcGIS进行反距离权重插值分析,结合盆地内已探明的断裂构造,探讨盆地沉积中心的演变。结果表明,不同期次的海侵层在盆地内分布特征存在显著差异:1)全新世海侵层的层顶与层底埋深具有显著的正相关关系,层底埋深与海侵层厚度之间存在显著的负相关关系,而与现代地表高程也存在一定的正相关关系,表明全新世海侵层沉积以来盆地内部未发生明显的差异性构造沉降;2)MIS 3海侵层的层顶、层底埋深同样具有显著的正相关关系,而层底埋深与海侵层厚度之间有一定的负相关关系,但是相较全新世弱得多,层底埋深与现代地表高程不存在相关关系,表明MIS 3海侵层沉积以来盆地内部可能发生过差异性的构造沉降;3)ArcGIS反距离权重插值结果显示,盆地内部以闽江为界,闽江以北多为沉积中心,相对下沉,闽江以南则相对抬升,沉积中心随时间有向西转移的趋势,从鼓山山前断裂带转移到八一水库—尚干断裂带。