琼东南盆地渐新世崖城组基准面旋回划分与转换机制

从钻井岩心、测井、地震、构造沉降和全球海平面变化方面研究了琼东南盆地渐新世崖城组的基准面旋回特征和转换机制．岩心主要用于识别短周期基准面旋回,用岩心标定测井曲线后,可用测井曲线叠加识别出中周期旋回,并据此建立起中短周期基准面旋回的测井模式,可以识别无心井段的基准面旋回．长周期和超长周期旋回则主要利用地震剖面中反映地层不协调关系的上超、下超、削蚀等反射终止类型来识别．在此过程中,岩心、测井与地震三者需要互相验证．文中用地层回剥法恢复了崖城组地层厚度并计算出各凹陷的构造沉降速率为312．5～750m／Ma．结果表明：崖城组可以划分为1个超长周期、3个长周期和至少12个中周期旋回层序,短周期旋回层序类型发育齐全但数目变化较快．研究区的构造沉降速率远大于全球海平面变化速率（0．2～40m／Ma）,说明基准面旋回的发育和转换受构造沉降的控制程度明显大于全球海平面变化．     

鄂尔多斯盆地环县地区延安组高分辨率层序地层学特征

运用高分辨率层序地层学理论及方法，研究了鄂尔多斯盆地环县地区三叠系延安组不同级次的基准面旋回层序的界面特征、结构类型、叠加样式及空间分布模式、A／S变化对储集砂体的控制作用．结果表明：鄂尔多斯盆地环县地区延安组由3个长期、8个中期、36个短期基准面旋回层序组成，且存在向上变“深”非对称性(A型)，向上变“浅”非对称型(B型)以及向上变“深”复变“浅”的对称旋回(C型)3种型式的中短期基准面旋回层序结构．沿三角洲生长轴向方向，旋回层序结构型式呈由A型-C型-B型变化．在旋回层序界面叠合部位及旋回下部为储层砂体发育有利部位．     

陕西商南地区上泥盆统旋回层序研究

将旋回地层学（ｃｙｃｌｏｓｔｒａｔｉｇｒａｐｈｙ）和层序地层学（ｓｅｑｕｅｎｃｅ ｓｔｒａｔｉｇｒａｐｈｙ）有机地结合起来并应用沉积学和地层学的基本理论研究了陕西省商南地区上泥盆统王冠沟组旋回层序级别的划分、层序边界特征、三级旋回层序内部组成特征以来及米级旋回的沉积特点。王冠沟组可以识别出１．５个三级旋回层序，４个四级旋回层序，共发育８６个米级旋回，归属８大类。三级旋回层序发育低水位体系域（ＬＳＴ     

米兰凯维奇事件与河南中、新生代盆地沉积

通过对河南中、新生代盆地地层进行旋回划分及统计，发现其旋回周期与米兰凯维奇事件的周期基本吻合，证实了这些盆地沉积过程中米兰凯维奇事件的存在；分析了这些盆地沉积过程中米兰凯维奇旋回的多样性；利用米兰凯维奇旋回进行了地层划分与对比．     

华北中部太原组火山事件层与煤岩层对比--火山事件层的旋回性与煤岩层对比(Ⅱ)

研究了华北中部太原组火山事件层,结果表明：火山事件期次对应事件层反映的喷发强度变化具有旋回性,一个火山事件旋回对应一次区域构造活动,火山事件旋回具有区域稳定性．籍此以火山事件层旋回划分对比为基础、结合火山事件层的期次分析对比,建立了火山事件等时面．应用火山事件等时面对研究区太原组主要煤岩层进行了对比,进而提出了新的对比方案     

吉林省岩浆铜镍硫化物矿床成矿规律

从多旋回大地构造演化观点出发,分析了吉林省区域多旋回构造运动,控制多旋回的基性、超基性岩浆活动及其相应的成矿作用．与含镍有关的基性超基性岩体,主要受“台槽边界”赤峰一开源深断裂控制,沿深断裂一侧或其两侧成带分布、分群集中．含铜镍岩体类型有超基性岩型、基性一超基性岩型和基性岩型．成岩成矿是“多旋回、多期次、多阶段的产物”;按成矿作用和成矿阶段可分为深熔贯入型、分层熔离型、残余熔浆型．     

兖州煤田海平面升降变化与旋回的划分

通过对兖州煤田含煤地层旋回划分及结构特征分析，研究了海平面变化的特点及其对煤聚积的控制作用；论述了煤聚积过程中的主导控制作用；查明了含煤地层的旋回特征，表现为不对称性和不同级次的旋回相互叠加，海平面的变化具有高频率和突发性等特点，含煤地层旋回的特征主要受控于海平面的变化等．     

克拉通盆地旋回性沉积记录与成因岩石地层学

克拉通盆地旋回性沉积是不同周期海平面相对升降变化旋口的产物，其所形成的旋回层序是一个与成因相关的相序，其界面是相带突变面或相带不连续面。在大多数情况下不存在以“统一的岩性及岩相”为特征的地层记录，地层堆积作用是以异成因机制控制下的自旋回沉积过程为主要特征，岩石地层体的岩性及岩相总是要变化的，而这种变化规律就是不同级别旋回层序及其有序叠加形式．岩石地层单位具有相界面穿时及间断面穿时２种穿时性．根据地层的旋回性沉积记录──不同级别的旋回层序及其有序叠加形式，可以优化和厘订岩石地层单位，为岩石地层体的时空分布规律提供翔实的沉积学证据。     

碳酸盐异成因复合海平面变化施回层序──以北京西山张夏组为例

由于碳酸盐沉积作用与海平面变化存在有极其敏感的响应，不同级次的海平面变化旋回将形成不同级次的碳酸盐旋回层序，它们的相互叠加即形成异成因复合海平面变化旋回层序。张夏组灰岩大致构成１个三级旋回层序；３个四级旋回层序；６０余个米级旋回层序。三级旋回层序及四级旋回层序均由其规则的米级旋回层序的垂直叠加形式来加以识别。     

陆相地层的沉积旋回

<正> 从坡积到湖泊沉积,各类沉积物都有明显的旋回性。沉积旋回既是沉积岩的重要特征,也是地层划分与对比的重要依据。沉积旋回可分三类:海洋旋回、过渡旋回和大陆旋回。海洋旋回厚度大,分布广,层序稳定,在海相地层研究中受到了充分重视。过度旋回含重要煤层,相一旋回法是煤田地质研究的重要方法,研究也较透彻。陆相地层构成我国陆相含油盆地的主体,大陆旋回的一定部位常含重要生、储油层,是石油地质工作者的研究对象,这里仅对此作一初步探讨。     

Correlation and analysis of well-log sequence with Milankovitch cycles as rulers: A case study of coal-bearing strata of late Permian in western Guizhou

Based on the well-logging data of typical wells of Zhijin, Panxian and Weining areas in western Guizhou, the well-logging data GR of late Permian coal-bearing strata were processed and wavelet transform technique was used to carry out the sequence stratigraphy division and correlation. The study mainly focuses on the controlling effects which Milankovitch had on high frequency sequence, Milankovitch cycle can be used as a ruler of sequence stratigraphy division and correlation to ensure the scientificity and the unity of sequence stratigraphy division. According to well-logging signal of the ideal Milankovitch cycle, the corresponding relation between the wavelet scales and the cycles is determined by wavelet analysis. Through analyzing analog signals of subsequence sets to search the corresponding relation between various system tracts and the features of time-frequency, the internal features of wavelet transform scalogram could be made clearly. According to ideal model research, features of Milankovitch curves and wavelet spectrum can be seen clearly and each well can be classified into four third-order sequences and two system tracts. At the same time Milankovitch cycle can realize the division and correlation of stratigraphic sequence in a quick and convenient way.     

深水等深流沉积中记录的米兰科维奇特性——以陕西富平地区上奥陶统赵老峪组为例

陕西富平地区上奥陶统赵老峪组为深水盆地边缘至深水斜坡沉积环境,发育深水原地沉积、等深流沉积及重力流沉积。以野外实测剖面、岩相特征等资料为基础,结合米兰科维奇理论、天文地层学、古海洋学以及古气候学,系统研究该地区等深流强度与古气候、海平面、古盐度的关系。结果表明:Fischer图解可以客观、准确地反映深水沉积地层相对海平面变化;深水沉积及等深流沉积中不同级次旋回垂向组合关系记录了米兰科维奇特性,即小级别旋回在垂向上有序地按照1:4或者1:5的形式叠加构成较大级别旋回;等深流强度受米兰科维奇旋回影响,呈多周期弱→强→弱递变;等深流强化周期约为0.1 Ma。     

四川盆地东北地区长兴组米兰科维奇周期分析

为了研究川东北地区上二叠统长兴组中的米兰科维奇周期,采用Matlab提供的快速傅立叶变换数学函数,对该区测井曲线的频谱进行了分析.结果表明：长兴组中广泛地保存着123,44.89,35.11,21.16和17.72 ka的米兰科维奇沉积周期;地层中的沉积旋回主要受古气候变化的控制,偏心率、地轴倾角和岁差周期引起的地层旋回厚度变化范围分别为：10.64-13.74 m;2.89-5.35 m;1.57-2.40 m,其中受偏心率周期的影响最大.不同测井曲线虽然对地层中物理参数的敏感程度不同,但是反映的地质信息是一致的,都能很好地反映由气候变化引起的地层旋回.Matlab中的数学函数,简化了数学运算的过程,为地质工作者定量研究地质问题提供了一条简明有效的途径.     

米兰柯维奇旋回与高频波动周期的识别

运用频谱分析方法在塔里木盆地塔中地区志留系识别出米兰柯维奇旋回 .对米氏旋回进行波动分析表明 ,高频率的 5Ma周期波波动特征能够有效地解释生、储、盖演化 .周期波表现为峰峰叠加 ,为储层发育期 ;周期波表现为谷谷叠加时 ,为盖层发育期 .高频波由波峰→波谷过渡的特征 ,刚好对应层序地层学的海进体系域→高位体系域的变化 .     

东营凹陷南斜坡沙四段高频沉积 旋回对滩坝砂体的沉积控制作用

在东营凹陷南斜坡的沙四段地层中,常发育典型的湖相滩坝砂体沉积。详细观察表明,这些滩坝砂体在 垂向上常发育较为对称的高频基准面上升半旋回和下降半旋回,且对滩坝砂体的沉积过程有明显的控制作用。 通过测井曲线的频谱分析,高频基准面的变化与米兰柯维奇轨道气候周期有着密切的关系,而单砂体规模的滩 坝砂体在平面展布上又有着明显的对称性。这些都表明滩坝砂体主要沉积在湖平面升降转换的相对稳定期,同 生断层活动产生的陡坎或隆起会有助于滩坝砂体的富集。可根据滩坝砂体的垂向沉积序列和组合方式来判断 滩坝主体的分布位置。     

The net primary productivity of Mid-Jurassic peatland and its control factors: Evidenced by the Ordos Basin

Using the large-scale thick 4# coal seam from the Mid-Jurassic in the southern Ordos Basin as an example, this paper studied the net primary productivity(NPP) level of the Mid-Jurassic peatland, and discussed its control factors. Geophysical logging signals were used for a spectrum analysis to obtain the Milankovitch cycle parameters in coal seam. These were then used to calculate the accumulation rate of the residual carbon in 4# coal seam. The carbon loss can be calculated according to the density and residual carbon content of 4# coal seam. Then, the total carbon accumulation rate of the peatland was further derived, and the NPP of peatland was determined. The results show that the NPP of MidJurassic peatland is higher than that of Holocene at the same latitude. Comprehensive analysis indicates that the temperature, carbon dioxide and oxygen levels in atmosphere are the main control factors of the NPP of Mid-Jurassic peatland.     

Recognition of Milankovitch cycles in the stratigraphic record: application of the CWT and the FFT to well-log data

The authors applied a the combination of Continuous Wavelet Transform (CWT) and Fast Fourier Transform (FFF)methods to gamma ray well-log data from the Q3, G1 and D2 wells. This high-resolution stratigraphic study was based on Milankovitch's orbital cycle theory. It was found that the CWT scale factors, 'a,' of 12, 24 and 60 match the ratios of the periodicities of precession, obliquity and eccentricity very well. Nine intervals of the Permo-carboniferous strata were recognized to have Milankovitch cycles in them. For example, section A of well Q3 has 29 precession cycles, 15 obliquity cycles and 7 short eccentricity cycles. The wavelengths are 2.7, 4.4 and 7.8 m for precession, obliquity and eccentricity, respectively. Important geological parameters such as the stratigraphic completeness and the accumulation rate were also estimated. These results provide basic information for further cyclostratigraphic correlation studies in the area. They are of great significance for the study of ancient and future climate change.     

Astronomical forcing of sedimentary cycles of Late Eocene Liushagang Formation in the Bailian Sag,Fushan Depression,Beibuwan Basin,South China Sea

Sediments in the Liushagang Formation of Late Eocene form a group of key hydrocarbon play fairways in the Beibuwan Basin,South China Sea.As an important reservoir-forming combination,the Liushagang Formation consists of deltaic siliciclastic and show clear sedimentary cyclicity.According to paleontology research and stratigraphic correlation,the boundary between Liushagang Formation(Els)and Weizhou Formation(Ewz)is regarded as the Eocene-Oligocene boundary.The oxygen isotope dating for well cores from the top of the first Member of Liushagang Formation(Els1)and the bottom of the third Member of Weizhou Formation(Ewz3)give an isochron age of 35.2 Ma.Here,we use GR logging data as a paleoenvironmental proxy to conduct a detailed cyclostratigraphic study of the Els1 in the Bailian Sag,Fushan Depression.Power spectra,evolutionary fast Fourier transformation and wavelet analysis all reveal significant sedimentary cycles in Els1.The ratios of cycle wavelengths in these stratigraphic units are 21?5?2.8?1.2?1,and are interpreted as Milankovitch cycles of 400 ka and 96 ka eccentricity,52 ka obliquity,22ka and 19 ka precession cycles,respectively.An astronomical time scale is established by tuning filtered 96 ka eccentricity cycles to a target curve of Well L2 in the Bailian Sag.Based on regional stratigraphic framework,combined with seismic,cores and logging data,the HST of the first member of the Liushagang Formation(Els1)delta in Well L2 was divided into six parasequence sets named Ps1-Ps6.According to the spectrum analysis by Simple Lomb periodogram from PAST program packages,the sediment accumulation rate of each parasequence sets first increased and then decreased as time went by.The sediment accumulation rate of Ps4 reached the maximum(0.127 m/ka)during the most prosperous period of delta prograding.Finally,the duration of each period of parasequence sets and more accurate geological age were calculated on the basis of sediment accumulation rate.The ages of each depth are precisely estimated and provide new constraints on the Late Eocene.     

干气密封摩擦副启停阶段摩擦特性的仿真研究

针对干气密封非稳态下摩擦特性对密封性能的影响进行研究,考虑动、静环材料属性,微凸体之间的相互作用以及摩擦热流耦合,建立了三维粗糙实体与理想光滑刚体滑动摩擦热力耦合模型。运用ANSYS软件数值模拟了摩擦热以及应力变化规律。研究发现,粗糙表面最高接触温度随滑动时间增加呈逐步上升趋势,并且温升呈 现了一定的波动性;粗糙表面的VonMises等效应力分布极其不均匀呈非线性变化;同时,还发现最大x 方向应力分量σxx 并未出现在最高接触微凸体上;在沿三维粗糙实体厚度方向存在一拉应力区,随着滑动时间的持续,拉应力区有一定程度扩大。从而说明两端面间的温升和波动性以热传导为主要影响因素,应力的变化是由于微凸体发生了弹塑性变形。研究成果为今后干气密封启停阶段特性研究以及参数优化奠定了基础。