共查询到18条相似文献，搜索用时 109 毫秒
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埕北低断阶区沙二段是大港油田近年来重点勘探层系之一,研究目标层段原油特点及油源对比分析对油气勘探具有重要的意义.研究表明,原油物理性质总体表现出高成熟原油特征,具有四低一高的特点,即低密度,低黏度,低胶质＋沥青含量、低含硫量及高含蜡量.原油地球化学性质和原油生物标志特征整体反映出生油母质形成于湖相沉积弱还原环境,具有丰富的藻类贡献,也表现出高成熟油特征.通过原油的物理四性分析和层系间油岩生物标志特征对比研究,分析认为其油气来源为两个方面：主要方面来自歧口凹陷和歧南次凹两大生油凹陷的双向供油,另一方面油气来自沙二段烃源岩的自生自储和沙三段的高成熟烃源岩. 相似文献
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珠五井位于珠江口盆地北部斜坡,1979年在下第三系中发现了许多层油砂,并试出了高产轻质工业油流.为探讨珠五井中地层的有机地球化学特征及其油源问题,我们曾先后进行了有机碳、还原硫、高低铁、沥青“A”、沥青“B”及其族组份等分析项目,并作了饱和烃的气相色谱、芳香烃、沥青质的红外光谱、沥青“A”的C、H元素、沥青“A”中碳的稳定同位素以及原油全烃气相色谱分析和原油的物性分析等项目.现将各指标的分析结果,予以整理归纳成文于后. 相似文献
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X构造的原油按照物性的差异主要分为两类:第一类为凝析油,具有密度低、含蜡量低的特点;第二类为蜡质油,具有密度中等、含蜡量高的特点。为了明确原油物性差异的原因,对原油的地球化学特征进行了深入分析,发现这两类原油的饱和烃色谱存在明显的差异,但甾烷特征、萜烷特征以及碳同位素特征又比较相似,表现出同源的特点,推测次生作用是原油物性差异的主要原因。对这两类原油的轻烃色谱以及指纹参数进行了精细对比,发现:①凝析油和蜡质油的全烃色谱存在镜像关系;②凝析油的庚烷/甲基环己烷(石蜡度)偏高,甲苯/正庚烷(芳香度)偏低,蜡质油则相反;③凝析油和蜡质油的正构烷烃nC_(m+1)/nC_m存在协变关系,且凝析油的数值更大。认为X构造原油遭受了气侵,凝析油是蒸发分馏的产物,而蜡质油则是蒸发分馏的残留油。 相似文献
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为研究环渤中凹陷挥发性原油特征、成藏主控因素和有利区带,利用原油族组分、原油物性、PVT高压物性实验分析等技术手段,对渤中凹陷及围区多个油田和含油气构造的原油组分和物性特征进行了统计分析,明确了渤中凹陷挥发性原油“五高三低”的特征以及各特征的数值范围。基于多组分相态变化的机理分析认为,渤中凹陷易于发育挥发性原油油藏的主控条件有3个：(1)优质烃源岩经过较高的热演化能够为挥发性原油提供轻质烃类组分;(2)渤中凹陷埋深较大,高温高压能够满足挥发性原油赋存的条件;(3)渤中凹陷快速沉降形成的区域泥岩盖层是挥发性原油能够保存的有利条件。基于渤中凹陷的温压梯度,推测渤中凹陷及围区埋深在2.5～4.3 km且有区域泥岩封盖的地层中易于发现挥发性油藏。 相似文献
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《中国海洋大学学报(自然科学版)》2021,(Z1)
应用化学分散剂是溢油处置常用的方法之一,其中分散剂对原油分散效果是人们重要的关注点。本文以6个渤海原油为研究对象,探讨了化学分散剂作用下不同原油分散效果的影响因素,针对不同粘度的原油表现出的"不同寻常"分散效果进行了探究。沥青质与胶质含量是影响原油分散效果和粘度的重要因素之一。当实验温度低于原油析蜡点时,随着析蜡量增多,原油分散效果变差。对于粘度高、密度大的原油,分散后产生油滴粒径大,短时间内不易上浮,所以短时间内检测的(30 s、10 min)乳化率高。实验结果有助于指导溢油处置中分散剂的正确使用和了解溢油在水环境中的行为及影响。 相似文献
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运用族组分、色谱、色谱-质谱等地化测试手段,总结了文昌13—1／2油田原油物性、母质类型及成熟度等地化特征,并分析了原油的来源。认为文昌13一1／2油田原油为典型的低硫、中高蜡陆相油源特征的正常成熟原油,推断原油主要来自文昌B凹陷文昌组滨浅湖相烃源岩。 相似文献
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黄河口凹陷是渤海湾盆地的富烃凹陷之一,近几年勘探发现原油超过2×108m3,天然气超过100×108m3,成果显著。但成功的背后,仍存在众多疑问：地质条件良好的构造上竟然钻了干井,同一个油源的相似构造,钻井结果有的以油层为主,而有的井含气层位多;同一深度段的油层,在不同井中原油密度却存在较大差异。为解决这些疑问,笔者运用差异聚集原理,首先对黄河口凹陷渤中28-2E空圈闭的形成原因进行了分析,建立了本区油气运移的模式。在此模式的指导下对渤中29-4构造开展了评价,准确预测了该构造含油气区域的分布范围,结果证明黄河口凹陷的油气运聚符合差异聚集原理。该原理能够很好的指导本区下一步的勘探,可以取得很好的经济效益。 相似文献
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渤海海域辽西凸起锦州A构造原油地球化学特征及油源分析 总被引：1，自引：0，他引：1
通过对辽西凸起锦州A构造沙河街组二段原油的地球化学分析,研究了原油的物性、成熟度和生物标志化合物特征。通过对比辽西凹陷和辽中凹陷已发现典型油气田的原油地球化学特征,结合区域地质背景分析了锦州A构造的油源。研究结果表明,锦州A构造西盘为低蜡、低硫凝析原油,而东盘为高蜡、低硫轻质原油。原油饱和烃色谱完整,显示未遭受明显生物降解。油源母质为混合型,沙河街组二段原油陆源有机质输入较少。原油形成于弱还原—还原条件下的微咸水或咸水沉积环境。根据锦州A构造原油的生物标志物特征,利用聚类分析方法划分为2类原油:Ⅰ类原油表现为高伽马蜡烷指数、低—中等四甲基甾烷指数、低藿烷/甾烷、高C_(27)/C_(29)甾烷和高C_(28)/C_(29)甾烷比值,主要来源于辽西凹陷沙一段烃源岩;Ⅱ类原油表现为低—中等伽马蜡烷指数、中等—高四甲基甾烷指数、高藿烷/甾烷、中等C_(27)/C_(29)甾烷和低C_(28)/C_(29)甾烷比值,主要来源于辽中凹陷沙三段烃源岩。 相似文献
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根据岩石薄片、扫描电镜、物性和测井等资料,分析了渤中凹陷A2—1构造东营组砂岩储层品质控制因素,探讨了测试段产能差异的原因。通过分析认为：渤中凹陷古近系东营组储层物性主要受压实作用、沉积条件、碳酸盐胶结、溶蚀作用和黏土转化阶段控制。在负胶结物投点图上,犬部分砂岩都落在压实作用区间,显示了压实作用是减少孔隙的主要因素;沉积条件对储层物性的影响突出体现在粒度和泥质含量方面的影响,随着粒度变细、泥质含量增加,渗透率明显降低。储层中普遍含碳酸盐胶结物且含量较高,是DST2测试段渗透率低、产能差的重要原因之一。两测试段储层中溶蚀作用普遍存在,主要体现在对长石的溶蚀,DST2测试段是强超压的半封闭系统,溶出物不能有效带出系统而沉淀在孔隙和喉道中,对储层物性破坏较大。黏土转化阶段与渗透率的快速降低段有较好的对应关系,渗透率变差段主要出现在伊蒙混层有序混层带以下。 相似文献
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《中国海洋大学学报(自然科学版)》2016,(6)
本文采取与海洋环境相似的条件(海水介质、UV-A光照),设计长实验周期30d,对单纯光降解和TiO_2催化降解原油的行为进行了比较研究,着重考察研究了TiO_2催化剂用量、硬脂酸包裹与否等条件对原油降解率的影响,通过紫外光谱、总有机碳分析仪、柱层析、气相色谱质谱(GC-MS)法,分析了原油水溶性成分(Water Soluble Fractions:WSF)、溶解有机碳(DOC)、原油组成的改变。结果表明原油光催化降解率高于光降解,TiO_2催化剂用量对原油降解率及WSF的组成和浓度有显著影响,催化剂是否包裹则影响不大。TiO_2质量分数为12.5%时原油降解率为39.14%,水体中DOC含量最高达到89.60mg/L,多环芳烃的降解率高达82.97%。估算的胶质降解率与芳香烃组分的降解率呈现正相关,光催化使得正构烷烃组分含量升高。 相似文献
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The Erlian Basin is located in the Central Asia-Mongolian fold belt between the Siberian and Sino-Korean Cratons. It is a Mesozoic continental rift basin composed of 52 individual fault-depressions. The main phase of rifting took place during the Early Cretaceous when a series of fluvial-lacustrine sediments were deposited. Each depression forms an independent sedimentary system and behaves as an independent petroleum system. Hydrocarbon source rocks are found in the upper Arshan and lower Tengger Formations. These are mainly type II source rocks and are mainly located in oil generation window at the present day. A series of oilfields and commercial oil flows have been found in the basin, highlighting its good petroleum potential. Many of these oils are heavy.Six oil samples from the Anan and ten from the Jirgalangtu Depressions have been subjected to routine geochemical analytical techniques in order to evaluate the origins. The methods used include gas chromatography of the saturated and aromatic hydrocarbon fractions, gas-chromatography-mass-spectrometry of the saturated hydrocarbon fraction and stable carbon isotope analyses. The trace metal elements of the biodegraded oils from the Jirgalangtu Depression were also analysed by atomic absorption spectroscopy.Two types of heavy oils : primary and biodegraded were identified on the basis of these data. The former includes both immature and mature heavy oils. A filtering-and-spill process was proposed to explain the origin of primary mature heavy oils (or tar-mat) in the Anan Depression. The biodegraded oils from the Jirgalangtu Depression were ranked and classified in terms of the degree of biodegradation, using a series of geochemical parameters based on the gas chromatographic concentrations and biomarker fingerprints of gas-chromatography-mass-spectrometry of the saturated hydrocarbon fraction. The relationship between oil saturation and porosity indicates that the heavy oils in the Jirgalangtu Depression were biodegraded after they accumulated. 相似文献
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多环芳烃油指纹应用于船舶溢油鉴别研究 总被引：2，自引：0，他引：2
溢油种类主要包括船舶燃料油和原油,二者性质的差异决定了鉴别方法也相应不同,寻求适合于船舶溢油的鉴别方法具有重要意义。在使用柱色谱层析方法对样品进行分离前处理的基础上,以气相色谱/质谱方法(GC-MS)为主要分析手段,对溢油样品和可疑船舶溢油源样品的多环芳烃油指纹特征进行对比,并在多环芳烃油指纹参数的基础上进一步进行多环芳烃内组成三角图分布特征与聚类分析研究,成功为珠江口水域某船舶溢油事故追踪到肇事溢油源。结果表明:取自丁船的油样和现场溢油样芳烃油指纹特征最为相近,是此次溢油事故的溢油源。受风化作用后的船舶燃料油中饱和烃类化合物数量稀少,且含量极低,不适合用于溢油鉴别,而多环芳烃类化合物较饱和烃类化合物而言具有含量高、种类丰富的特点,是该类溢油鉴别的主要油指纹依据。使用油指纹参数进行可疑溢油源识别时,充分考虑油品中有机分子所受风化影响程度的不同是风化条件下溢油鉴定的关键。因此,多环芳烃油指纹可以有效应用于船舶燃料油溢油的鉴别。 相似文献
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在已了解的松辽盆地登娄库—永安地区构造和沉积演化特点的基础上,利用现有钻井的岩心资料、测井资料和地震资料,对该地区的成藏模式特征从运移方式和生储盖空间组合两个方面上进行了研究和分类,分析了各自形成的主控因素.研究表明,该区域地层具有断坳双层结构,按油气运移类型划分,在断陷期主要发育两种油气成藏模式,分别为原生油气成藏模式和次生油气成藏模式;在坳陷期主要发育次生油气成藏模式和混生油气藏.从储层与烃源岩的空间组合上来看,区域内主要发育有上生下储、下生上储和自生自储这三种油气成藏模式.形成这些不同成藏模式的主要因素是该区深至基底的大型断裂构造和继承性断裂、反转构造以及固有沉积环境等. 相似文献
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Sixty crude oils from the Termit Basin (Eastern Niger) were analysed using biomarker distributions and bulk stable carbon isotopic compositions. Comprehensive oil-to-oil correlation indicates that there are two distinct families in the Termit Basin. The majority of the oils are geochemically similar and characterized by low Pr/Ph (pristane to phytane ratios) and high gammacerane/C30 hopane ratios, small amounts of C24 tetracyclic terpanes but abundant C23 tricyclic terpane, and lower δ13C values for saturated and aromatic hydrocarbon fractions. All of these geochemical characteristics indicate possible marine sources with saline and reducing depositional environments. In contrast, oils from well DD-1 have different geochemical features. They are characterized by relatively higher Pr/Ph and lower gammacerane/C30 hopane ratios, higher amounts of C24 tetracyclic terpane but a low content of C23 tricyclic terpane, and relatively higher δ13C values for saturated and aromatic hydrocarbon fractions. These geochemical signatures indicate possible lacustrine sources deposited under freshwater, suboxic-oxic conditions. This oil family also has a unique biomarker signature in that there are large amounts of C30 4α-methylsteranes indicating a freshwater lacustrine depositional environment.The maturity of the Termit oils is assessed using a number of maturity indicators based on biomarkers, alkyl naphthalenes, alkyl phenanthrenes and alkyl dibenzothiophenes. All parameters indicate that all of the oils are generated by source rocks within the main phase of the oil generation stage with equivalent vitrinite reflectance of 0.58%–0.87%. 相似文献
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Understanding the oil distribution characteristics in unconventional tight reservoirs is crucial for hydrocarbon evaluation and oil/gas extraction from such reservoirs. Previous studies on tight oil distribution characteristics are mostly concerned with the basin scale. Based on Lucaogou core samples, geochemical approaches including Soxhlet extraction, total organic carbon (TOC), and Rock-Eval are combined with reservoir physical approaches including mercury injection capillary pressure (MICP) and porosity-permeability analysis, to quantitatively evaluate oil distribution of tight reservoirs on micro scale. The emphasis is to identify the key geological control factors of micro oil distribution in such tight reservoirs. Dolomicrites and non-detrital mudstones have excellent hydrocarbon generation capacity while detritus-containing dolomites, siltstones, and silty mudstones have higher porosity and oil content, and coarser pore throat radius. Oil content is mainly controlled by porosity, pore throat radius, and hydrocarbon generation capacity. Porosity is positively correlated with oil content in almost all samples including various lithologies, indicating that it is a primary constraint for providing storage space. Pore throat radius is also an important factor, as oil migration is inhibited by the capillary pressure which must be overcome. If the reservoir rock with suitable porosity has no hydrocarbon generation capacity, pore throat radius will be decisive. As tight reservoirs are generally characterized by widely distributed nanoscale pore throats and high capillary pressure, hydrocarbon generation capacity plays an important role in reservoir rocks with suitable porosity and fine pore throats. Because such reservoir rocks cannot be charged completely. The positive correlation between hydrocarbon generation capacity and oil content in three types of high porosity lithologies (detritus-containing dolomites, siltstones, and silty mudstones) supports this assertion. 相似文献
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油田水动力系统与油气藏的形成 总被引：6，自引：0，他引：6
油田水中存在“沉积承压水”和“地表渗入水”两个相对独立而又相互作用的水动力系统,前者由上覆地层重量所引起的地静压力以及地静压力等引起的异常孔隙流体压力所形成,具有内循环承压式水交替特征,后者为大气降水和地表水向储集层的渗入而形成,以外循环渗入或水交替为特征。这两大系统（尤其是前者）的作用在很大程度上控制了含油气盆地中油气的运移、聚集和保存,油气聚集区主要位于水文地质带中的交管阻滞一停滞带内,沉积交替强度的低值区是油气富集区,沉积水的离心流使凹陷中的油气围绕凹陷中心呈带状分布。 相似文献