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山东五号桩油田桩74块剩余油分布规律及挖潜措施 总被引：5，自引：2，他引：3
低渗透油田开发在中国石油工业中具有特别重要的意义。应用岩心、测井等资料将山东五号桩油田桩74块远岸浊积扇划分为扇根、扇中、扇缘3个亚相,其中扇中亚相划分为辫状水道、水道间、水道侧缘、扇中前缘及叶状体5个微相类型;阐明了研究区特低渗透油藏内储层的层内、层间及平面非均质特征;系统总结了微构造的类型及组合模式。在沉积微相、储层非均质性及微构造研究的基础上,采用动态、静态结合的分析方法阐明了研究区特低渗透油藏的剩余油分布规律及控制因素,揭示了沉积微相、储层非均质、微构造及井网条件等因素对剩余油分布的控制作用。根据剩余油分布的研究结果,结合相关资料,指出了剩余油潜力区,有针对性地确定了剩余油的挖潜措施,为增加剩余可采储量和提高采收率提供了科学依据。 相似文献
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以涠西南凹陷W油田为例,为加深对储层非均质性的认识,开展了基于复合砂体构型的流动单元研究,总结了剩余油分布模式。基于油田稀井网资料,通过井震结合、动静结合,并参考类似储层地质知识库特点,开展了复合砂体构型解剖;利用筛选的孔隙度、渗透率和流动带指数（FZI）把研究区储层分为四类流动单元,并在复合砂体内部刻画了流动单元的分布,总结了其分布规律。研究认为:研究区三角洲前缘复合砂体内部结构复杂,复合砂体构型、流动单元、断层等地质因素对油田水淹特征及剩余油分布影响较大,并深入分析了调整井水淹层的水淹特征,总结出了受流动单元主控的“差异驱替控油模式”、受流动单元与隔夹层共控的“复合遮挡控油模式”和受流动单元与断层共控的“断储联合控油模式”3种主要剩余油分布模式。研究成果为油田挖潜提供了重要参考。 相似文献
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文昌C油田珠海组二段一油组纵向多期砂体相互叠置,内部结构复杂、非均质性强,目前已进入“双高”采出阶段,剩余油分布规律不明。厚储层平面上受断层分布及不同构型单元储层质量差异的影响,水驱规律呈现明显分区性;纵向上受砂体复杂内部结构及隔夹层分布控制,水驱顺层突进现象明显,水驱规律不明确制约油田下步调整挖潜。在精细构型研究基础上,结合毛管压力等微观孔喉参数,利用判别函数对渗流单元进行定量刻画,弥补了传统FZI划分流动单元不够精细的问题,更契合生产动态。明确了两种剩余油控制模式:一是渗流单元差异平面控油模式;二是渗流屏障遮挡垂向控油模式。结果表明:研究区平面划分5个井区,纵向划分15个单层,共划分60个含油单元,结合生产动态得到每个渗流单元的采出程度及剩余油分布规律,针对性地提出了7项措施,有效提高了本油田开发效果,同时也为类似复杂厚层砂岩油藏剩余油挖潜提供经验借鉴。 相似文献
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低弯度分流河道储层是杏北油田的重要储层类型,深入研究其储层构型特征对于油田调整挖潜意义重大。综合密井网岩心、测井和生产动态等资料,采用“层次分析和模式指导”的方法,分“复合河道和溢岸砂体、单期河道及其相互接触关系”两个主要层次开展储层构型精细解剖,构建了三维储层构型模型。基于密闭取心井、水淹层测井解释资料和生产动态数据分析了不同时期的水淹特征和剩余油分布,并通过基于三维构型模型的油藏数值模拟对剩余油分布模式进行验证,最终总结出不同储层构型控制下的剩余油富集模式。结果表明,在河道内,剩余油在顶部、边部、河道间夹层控制部位以下以及仅与低渗溢岸砂连通造成注采不完善的河道内部富集;在河道外,剩余油在河间物性较差的溢岸砂内、注采不完善的溢岸砂末端和孤立砂体内富集。 相似文献
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微观驱油试验表明,交联聚合物驱后剩余油进一步减少,主要以斑块状、小油滴状等形态分布于微孔隙中;数值模拟显示,下二门油田H2Ⅲ油组交联聚合物驱后80.8%的面积已为中强水淹,纵向上79.7%的剩余油分布于主力油层.受构造、储层物性及井网因素控制,未淹、弱水淹剩余油平面上主要分布在断层附近、断层破碎带、微构造高点和砂体上倾尖灭区等部位;纵向上主要分布于低渗透层段.针对剩余油分布特征,通过完善注采关系、优化注采结构,单元含水量的上升速度和产量递减幅度得到控制,采收率在交联聚合物驱的基础上进一步提高了2.01%. 相似文献
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冀东油田明化镇组NmⅢ12-1小层井网分布不均,但地震资料品质较好。为此,对该小层进行井震结合砂体构型表征,建立曲流河砂体构型边界的正演概念模型。利用地震沿层切片属性、反演等地震资料及测井砂体特征有效提高单一河道边界及点砂坝砂体识别精度。采用“模式拟合”对点砂坝及其内部构型进行表征,利用水平井及动态资料验证构型解剖的合理性。在此基础上,建立三维储层构型模型并进行数值模拟,预测剩余油,提出曲流河砂体控制剩余油分布。开发中后期的油藏,正向微构造、储层构型和井网是剩余油分布的主控因素。构型控制的剩余油多集中在点砂坝的中上部;废弃河道及点砂坝内侧积层对渗流产生一定的遮挡,在废弃河道附近及侧积层间的侧积体常富集剩余油。研究对油田开发方案的调整具有重要意义。 相似文献
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流花11-1油田礁灰岩油藏储层非均质性及剩余油分布规律 总被引：6，自引：0，他引：6
结合流花11-1油田的岩芯、测井、地震、开发动态等资料总结了礁灰岩油藏沉积、成岩及构造等因素造成的储层非均质特征,引入的储层非均质综合指数,可更快速、直观地揭示了剩余油的分布规律.分析了控制剩余油分布规律的地质因素和开发因素.根据储层非均质性的综合研究成果,指出了剩余油潜力区;在潜力区部署的侧钻井生产情况较好,研究成果得到了验证.该研究思路对类似油田储层非均质性的表征与剩余油分布的预测有较好的借鉴作用. 相似文献
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为研究鄂尔多斯盆地上三叠统延长组长81亚油层组沉积微相与储层物性的关系,通过岩心相、测井相及物性等资料,结合前人研究成果,对盆内合水地区长81亚油层组进行分析。认为:(1)长81亚油层组浅水三角洲前缘沉积发育水下分流河道、河口坝、前缘席状砂、分流间湾4种沉积微相。多期叠置的水下分流河道是控制砂体发育的主要微相类型,根据砂地比又可分为河道核部、河道中部及河道侧翼;(2)长812小层水下分流河道砂体发育频率较高、沉积期次较多、连通性较强,其次为长8812小层与长813小层;(3)由沉积微相决定的岩石结构成熟度控制了储层的初始孔隙度,进而在一定程度上影响了储层现今孔隙度。水下分流河道核部储层物性最好,是有利微相类型。研究区长812小层有利微相发育规模最大,为后期勘探开发首要目的层位。 相似文献
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To reduce or avoid some of the ambiguities in a heterogeneous reservoir, a fine three-dimensional model would be inevitably established with the application of geostatistical techniques. BD oilfield is a low-permeability fractured reservoir with many fracture types, which composes a multi-azimuthal fracture system, causing strong anisotropy and heterogeneity. Moreover, fracture provides not only accumulation space for oil and gas but also channels for migration of hydrocarbons and water dashing and thus plays a leading role in controlling BD reservoir production. With the continuous exploitation of oil in reservoir for more than 30 years, BD oilfield has currently stepped into high water cut stage, exposing many problems such as low oil recovery, poor exploitation stability, rapid oil production decline, and one-way water intrusion. Therefore, a detailed reservoir characterization, constructed to describe reservoir behavior under strong water drive in a well-developed fractured reservoir, is urgently needed. In this study, combined with three-dimensional geostatistical techniques, an accurate and efficient reservoir parameter model that occurs in a strong heterogeneous fractured reservoir has been constructed through stratigraphic correlation and sedimentary facies analysis. Hence, all the study presented above will be available for well location, remaining oil potential-tapping and oil recovery improvement during the later study work. 相似文献
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Simon C George Christopher J Boreham Sandra A Minifie Stan C Teerman 《Organic Geochemistry》2002,33(12)
A suite of 18 oils from the Barrow Island oilfield, Australia, and a non-biodegraded reference oil have been analysed compositionally in order to detail the effect of minor to moderate biodegradation on C5 to C9 hydrocarbons. Carbon isotopic data for individual low molecular weight hydrocarbons were also obtained for six of the oils. The Barrow Island oils came from different production wells, reservoir horizons, and compartments, but have a common source (the Upper Jurassic Dingo Claystone Formation), with some organo-facies differences. Hydrocarbon ratios based on hopanes, steranes, alkylnaphthalenes and alkylphenanthrenes indicate thermal maturities of about 0.8% Rc for most of the oils. The co-occurrence in all the oils of relatively high amounts of 25-norhopanes with C5 to C9 hydrocarbons, aromatic hydrocarbons and cyclic alkanes implies that the oils are the result of multiple charging, with a heavily biodegraded charge being overprinted by fresher and more pristine oil. The later oil charge was itself variably biodegraded, leading to significant compositional variations across the oilfield, which help delineate compartmentalisation. Biodegradation resulted in strong depletion of n-alkanes (>95%) from most of the oils. Benzene and toluene were partially or completely removed from the Barrow Island oils by water washing. However, hydrocarbons with lower water solubility were either not affected by water washing, or water washing had only a minor effect. There are three main controls on the susceptibility to biodegradation of cyclic, branched and aromatic low molecular weight hydrocarbons: carbon skeleton, degree of alkylation, and position of alkylation. Firstly, ring preference ratios at C6 and C7 show that isoalkanes are retained preferentially relative to alkylcyclohexanes, and to some extent alkylcyclopentanes. Dimethylpentanes are substantially more resistant to biodegradation than most dimethylcyclopentanes, but methylhexanes are depleted faster than methylpentanes and dimethylcyclopentanes. For C8 and C9 hydrocarbons, alkylcyclohexanes are more resistant to biodegradation than linear alkanes. Secondly, there is a trend of lower susceptibility to biodegradation with greater alkyl substitution for isoalkanes, alkylcyclohexanes, alkylcyclopentanes and alkylbenzenes. Thirdly, the position of alkylation has a strong control, with adjacent methyl groups reducing the susceptibility of an isomer to biodegradation. 1,2,3-Trimethylbenzene is the most resistant of the C3 alkylbenzene isomers during moderate biodegradation. 2-Methylalkanes are the most susceptible branched alkanes to biodegradation, 3-methylalkanes are the most resistant and 4-methylalkanes have intermediate resistance. Therefore, terminal methyl groups are more prone to bacterial attack compared to mid-chain isomers, and C3 carbon chains are more readily utilised than C2 carbon chains. 1,1-Dimethylcyclopentane and 1,1-dimethylcyclohexane are the most resistant of the alkylcyclohexanes and alkylcyclopentanes to biodegradation. The straight-chained and branched C5–C9 alkanes are isotopically light (depleted in 13C) relative to cycloalkanes and aromatic hydrocarbons. The effects of biodegradation consistently lead to enrichment in 13C for each remaining hydrocarbon, due to preferential removal of 12C. Differences in the rates of biodegradation of low molecular weight hydrocarbons shown by compositional data are also reflected in the level of enrichment in 13C. The carbon isotopic effects of biodegradation show a decreasing level of isotopic enrichments in 13C with increasing molecular weight. This suggests that the kinetic isotope effect associated with biodegradation is site-specific and often related to a terminal carbon, where its impact on the isotopic composition becomes progressively ‘diluted’ with increasing carbon number. 相似文献
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砂岩油田开发过程中注采结构优化调整是一项非常复杂的工程,采液速度和采油速度是其中两个重要的指标,依照其变化可以把油田不同开采阶段划分为3种模式:提液稳产模式、稳液降产模式和降液控水模式。注采结构直接关系到油田的开发效果,在油气田不同的开发阶段,注采结构中存在的问题也是不同的。为了达到注采结构优化调整目的,针对沉积微相、沉积构造和剩余油分布进行精细的研究,根据构造特点调整注采结构,根据微构造、沉积微相特征进行注采井网的适应性调整,从而提高注水结构面横纵向调整和注水井整体调整以及油田分区、油井分类及单井结构调整等注采结构优化调整的切实效果。 相似文献
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Yunfeng Yang Xianqing Li Songbao Feng Kangdong Wang Longxi Kong Peng Dong Feng Xu Dehua Peng Yan Chen 《中国地球化学学报》2010,29(4):422-430
Based on the results of fluid inclusion study (microscopic characteristics, homogenization temperatures and grains with oil
inclusions), the pool-forming time of the Nanbaxian and Mabei 1 oilfields in northern Qaidam Basin was discussed in this paper.
Fluid inclusions in northern Qaidam Basin are relatively abundant, including aqueous inclusions and hydrocarbon inclusions.
These inclusions are small (5–10 μm), and mainly distributed in quartz fissures, overgrowths and cementations. The abundances
of grains with oil inclusions (GOI) are commonly low. The GOI values of most samples are between 2.0%–10.5%, and those of
about 40 percent of total samples exceed 5%. The homogenization temperatures of fluid inclusions in different samples are
markedly dissimilar, indicating that these inclusions were formed in different periods. According to the measured homogenization
temperatures of fluid inclusions and in combination with burial history and thermal evolution history, the Nanbaxian and Mabei
1 oilfields are deduced, which have experienced two hydrocarbon charging periods, with the former of N1-N2
1 and N2
2–N2
3, and the latter of N1 and N1 end −N2, respectively. 相似文献
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莫里青油田从2008年开始一直坚持勘探与开发一体化,在油藏增产增效方面取得了重大突破。储集层呈典型的岩性油藏特征,多期多物源沉积物的叠加,导致该油田岩性变化快,储层非均质性强,在2011年之前随着生产井数量的增加,产量不断上升,但是之后随着压力亏空,能力补充不及时,目前产油呈下降趋势,加之岩性油藏的隐蔽性和复杂性,使开发遇到了瓶颈。从油田开发效果来看,为了有效改善和提高莫里青油田开采效率,必须加强地质认识,在此基础上进行高效的生产。在区域沉积背景下,通过大量岩心观察与描述,从沉积物形成条件、物源方向以及分选性对莫里青油田的沉积模式进行识别,提出了斜坡裙沉积模式。在沉积模式指导下,基于单井砂体统计基础,识别出3种沉积亚相,并进一步细分出5种微相类型。 相似文献
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