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1.
古巴三区块是2005年中国石化获得的风险勘探开发合同区块,位于墨西哥湾西南部,是古巴西部的前陆盆地之一。结合该盆地勘探现状,对相关的钻井、物探以及地球化学等资料进行石油地质综合分析,评价了该盆地的油气成藏条件及其勘探潜力,预测了有利区带。三区块主要发育上侏罗统一下白垩统的泥灰岩、泥质灰岩和中-下侏罗统泥页岩两套主要烃源岩,储层以泥晶灰岩、灰岩和砂砾岩为主,区内早期形成的圈闭在造山期基本遭到破坏,有效的圈闭主要形成于晚古近纪,圈闭类型有背斜、断鼻、断块和地层圈闭等,推测可能发育多套储盖组合。据区域对比和钻井资料分析,区内的前陆冲断带是本区最有利勘探区带,南盆地北缘发育较厚的第三系,推测是本区有利远景区。  相似文献   

2.
针对渤中探区Q构造新近系近十年探索没有取得突破性进展,借鉴周边成熟油田浅层岩性勘探的思路,以地质认识为指导,以精细构造解释和岩性圈闭刻画为核心,综合运用地层切片、地震属性分析、90度相移及低幅度构造变速成图等多项地球物理技术,对新近系明下段浅水三角洲岩性圈闭进行精细识别与刻画.结果表明:地层切片结合地震属性技术有效识别砂体平面展布特征,90度相移技术辅助完成砂体精细刻画,低幅度构造变速成图技术真实反映砂体构造特征.通过多项地球物理技术的应用,相继发现了Qa、Qb/c及Qd等一系列浅层岩性含油气构造,掀起了渤海海域浅层岩性勘探的热潮,同时也对相似地质背景探区具有借鉴意义.  相似文献   

3.
Sampaguita气田位于南沙礼乐滩南部,水深75~85m。该气田经过4口井钻探,初步获得气储量3~20TSCF,已成为勘探开发的新热点。该气田东距菲律宾巴拉望岛约200km,西距美济礁约200km。文章根据收集和近年采集的地球物理资料对Sampaguita气田及其附近岛礁区的油气地质条件分析,指出Sampaguita气田西南岛礁区具有有利的生油条件、圈闭构造形成和油气聚集条件,需加强勘探和开发。  相似文献   

4.
Sureste盆地位于墨西哥湾南部,为系统研究该区盐相关圈闭。基于第1手的地质、钻井、油田和地球物理资料,从盆地构造演化阶段、沉积充填特征、盐岩活动期次出发,系统分析了圈闭成因、发育特征、空间展布规律。结合盆地勘探程度指出,Comalcalco次盆东部侏罗—白垩系盐核背斜圈闭和Reforma褶皱带中北部牛津阶和基末利阶盐核背斜圈闭、伸展盐筏断块圈闭为最有潜力勘探目标,为该盆地盐上勘探目标的优选提供了科学依据。  相似文献   

5.
在南海北部利用地球化学方法作为油气勘探的一种辅助手段。在6个航次中采集了沉积物、底层海水及海面大气样品,测定了近50种化探指标,并采用稳健统计方法进行了数据处理和异常圈定。化探结果在油气藏上方发现了清晰的、具不同指标组合的综合化探异常,与邻近空构造形成鲜明的对照。圈闭顶部的块状异常和圈闭周绿的环状、半环状异常是下伏油气藏的良好指示,而剖面上呈锯齿状、平面上呈线状的异常则与断裂带有关。实践表明,建立已知油气藏上方的化探异常模式及解剖已知空构造上方的地球化学特征对于指导本区或邻区的化探异常评价是十分必要的。  相似文献   

6.
海域层序地层学环境恢复技术是针对我国区勘探初期的沉积盆地,充分利用已有的地质和地球物理资料,主要是二维地震资料,以层序地层学为指导,在层序分析、地震相和岩性预测的基础上,研究盆地发育的各沉积时期的沉积环境及沉积演化的地球物理资料地质解释技术,本文介绍了该技术的系统构成、技术特点和实现过程。  相似文献   

7.
近海湾口潮汐沉积特征通常以地质资料进行描述,而很少以地球物理资料进行描述。或仅利用某种地球物理资料进行分析。本文通过利用多波束、侧扫声呐、单道地震、多道高分辨率地震和磁法等多种地球物理勘探方法和技术,针对胶州湾近海湾口潮汐沉积的地球物理特征进行了初步研究,获得了近海湾口潮汐沉积典型的地球物理特征。  相似文献   

8.
《海洋地质译丛》2014,(3):100-100
宽频地震勘探技术是实现高精度地震勘探的重要方法之一,能够获得薄层和小型沉积圈闭的高分辨率图像,并实现深部目标体的清晰成像,提供更多的地层结构及细节信息,提高地震资料的解释水平,同时提供更加稳定的反演结果。西方地球物理公司、CGG等多家公司相继推出宽频地震采集与处理技术,并已在全球很多地区进行应用。  相似文献   

9.
珠江三角洲1:10万海洋地质环境调查研究综述   总被引:1,自引:0,他引:1  
1998-2005年,广州海洋地质调查局开展了1:10万《珠江三角洲近岸海洋地质环境与地质灾害调查》,项目采用了遥感分析、综合地球物理勘探、海水和地质样品分析、海洋环境多参量测量、海流观测、锥探、钻探及实验分析等方法,对珠江三角洲近岸海域的海底地形、地貌、沉积物类型、浅地层结构与各土层的物理力学性质、海水化学特征(水污染)、潜在地质灾害类型和分布等进行了较深入的调查研究。项目综合评价了珠江三角洲海洋地质环境质量,提出了减灾防灾建议。为珠江三角洲沿海地区的发展规划、海洋管理、环境保护以及可持续发展提供系统的基础地质资料和科学依据。  相似文献   

10.
胜顺油田位于渤海海域渤东凹陷东部斜坡带,近10年勘探处于停滞不前状态,勘探潜力及勘探方向不明,如何打开勘探局面成为当前面临的关键问题。研究区主要发育元古界、沙四段—孔店组、东营组及馆下段4套良好的储盖组合。利用地震、钻井等资料,对研究区断裂、圈闭、成藏条件进行了综合分析,落实了不同层系的勘探潜力。其中,元古界构造圈闭面积大,但储层非均质性强,内部构造复杂,可作为兼探层系;沙四段—孔店组具典型残留地层特征,岩性以火成岩为主,储层物性较差,勘探难度大;东营组和馆下段是本区主力勘探层系,受走滑断裂发育程度和规模的影响,构造圈闭表现为面积小、含油高度低的特点,地层超覆圈闭和断裂岩性圈闭具有较大勘探潜力。东营组底部不整合对油气大范围横向运移有重要作用;不同走向断层控制了油气富集差异。NNE向主油源断层+东营组底部不整合+NWW向次级油源断层构成了本区油气自西向东阶梯式运移的立体输导网络。依据油气运聚规律认识,近期突破应优先考虑近源勘探。  相似文献   

11.
Large to middle-scale thrust structures are important reservoir plays for coal-derived hydrocarbons in the foreland basins of NW China, with both gas and some accompanying oil. In the Dabei Gas Field of the Kuqa Thrust, however, the oil and gas pools are vertically distributed in a quite unique way: (1) liquid oil and some dissolved gas are present in the Dawanqi Anticline with the reservoir at 300-700 m depth, forming the only oil field in the Kuqa Thrust; (2) gas and minor accompanying oil are found in the deep reservoir of the Dabei-1 and Dabei-2 thrust traps around 5000-6000 m depth; (3) an extremely dry gas pool is found in the Dabei-3 thrust trap where the depth of the reservoir is over 7000 m. Geochemical data suggest that the hydrocarbons in the Dawanqi Anticline and the Dabei thrust traps originated from a similar source, i.e. the underlying Jurassic coal measures, with some contribution from Jurassic lacustrine shales. The Jurassic source rocks did not start to generate oil until the Miocene (around the Kangcun Stage), and extended into the Pliocene (the Kuche Stage) with the main gas generation period in the Pliocene (the Kuche Stage) and the Quaternary. Because the traps formed relatively early, the Dabei-1 and Dabei-2 thrusts could trap some of the early generated oils, but most of the early charged oil was redistributed to the shallower Dawanqi Anticline during the Kuche Stage. The Dabei-3 thrust trap formed concurrently with major gas generation and thus could not trap liquid hydrocarbons. The difference in the vertical distribution of the hydrocarbon accumulations in the Dabei Gas Field resulted from a complex interplay of source variability, structural evolution of the basin and thermal maturation.  相似文献   

12.
西湖凹陷油气成藏史分析   总被引:1,自引:0,他引:1  
在西湖凹陷区域研究新认识的基础上,通过构造发展史、排烃史、成藏期痕检资料、岩相组合等资料,重新认识西湖凹陷新生代盆地发展过程中圈闭(地层、构造)形成时间、烃源岩排烃时间、已发现油气藏成藏时间、多种疏导方式及形成时间以及对油气藏的破坏事件发生时间,推演西湖凹陷成藏史发展过程。结合新的油气成藏认识,提出今后工作方向的几点思考意见。  相似文献   

13.
墨西哥湾深水勘探区带是近年深水勘探活动最活跃的地区之一,通过对其石油地质条件以及勘探特点的综合分析,认为其具有优越的石油地质条件,其勘探研究具有4个特点:1地震技术革新极大推进了该区的勘探研究;2盐岩活动控制圈闭和油气藏的形成;3墨西哥湾深水区圈闭勘探呈明显的分带性;4圈闭落实和储层发育程度是主要勘探难点。并指出盐下圈闭落实和储层预测是制约该盆地勘探成功率的两大关键问题,而盐下地震成像、古盐构造恢复和古沉积水道的预测是解决这两大关键问题的主要手段。  相似文献   

14.
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   

15.
The fate of saturated and aromatic hydrocarbons discharged into the coastal Baltic Sea environment from the TSESIS oil spill has been studied in the acute and postacute (one year) phases of the spill. Periodic samples of Mytilus edulis (mussels) from eight littoral zone stations and Macoma balthica from nine soft bottom stations were obtained as well as sediment trap samples and surface sediment samples. Glass capillary gas chromatography and gas chromatographic mass spectrometry were used as the analytical tools to determine saturated and aromatic hydrocarbon composition and concentrations in these samples.Sediment trap samples indicated that sizable quantities of chemically and microbially weathered oil were sedimented, and available for benthic uptake shortly after the spill. After initial uptake of sedimented oil (500 to 1000 μ/g dry weight), Macoma populations appear to have begun slow depuration through the first winter after the spill, but TSESIS oil was again introduced to the benthic stations studied during the following summer. Mytilus populations in the region were severely impacted by the oil. Initial depuration of spilled oil during the first month was rapid and nearly complete at all but the most heavily impacted stations one year after the spill. The post-spill depuration of assimilated hydrocarbons was characterised by a relative retention of alkylated dibenzothiophenes and alkylated phenanthrenes compared to their unsubstituted parent compounds and compared with the entire homologous naphthalene series.These data suggest that petroleum hydrocarbons from the TSESIS spill have become a chronic source of degraded saturated and aromatic hydrocarbons to the soft bottom benthic communities. Petroleum hydrocarbons in the benthic environment from this spill appear to reside in the difficulty sampled and mobile flucculent layer at the sediment/water interface and may affect epifaunal communities for an extended period of time.  相似文献   

16.
胜利油田经过近40多年的勘探,按照国内外勘探程度划分的标准,其主力探区济阳坳陷目前已处于成熟勘探程度,全面进入隐蔽油气藏勘探阶段,勘探难度越来越大。尽管济阳坳陷探井成功率保持较高的水平,但仍有50%左右的探井落空或低效。根据“失利”探井定义,从生、储、盖、图、运、保等6种油气成藏控制因素出发,参考济阳坳陷石油地质特点和近几年的勘探经验,主要从圈闭是否有效、储层是否存在、输导体系是否发育、油气充满程度等4个方面进行失利探井地质原因分析,建立起成熟探区探井失利地质原因分析方法。总结了济阳坳陷“十五”以来主要增储目标,即:砂砾岩体、浊积砂体、滩坝砂体、河道砂体等储层类型的失利地质原因。在明确上述目标类型最主要勘探风险的基础上,提出了勘探攻关重点及风险规避建议。  相似文献   

17.
北黄海盆地地质构造特征及其在油气勘探中的意义   总被引:6,自引:0,他引:6  
通过对近年来在北黄海盆地的油气勘探认识的总结,结合区域地质研究成果,从盆地的基底结构、地质结构和主要构造类型等方面对北黄海盆地的地质构造特征进行了分析。提出北黄海盆地是在前中生代结晶基底之上发展起来的,盆地经历了走滑拉分(J3-K1)、断陷(E2-E3)、拗陷(N—Q)3次主要的沉降作用过程,形成了下、中、上3个构造层,在盆地内发育了断裂、褶皱和潜山3种基本构造类型。盆地的这种构造特征为盆地内油气的生成运聚提供了物质基础和边界条件,特别是晚侏罗世—早白垩世由于走滑拉分形成的下构造层具有较好的生烃物质基础,同时还有良好的圈闭发育条件,后期的构造改造也有利于油气的生成聚集,应是北黄海盆地的主要勘探对象。  相似文献   

18.
南海北部陆缘盆地与坎坡斯盆地   总被引:3,自引:1,他引:2  
我国南海是西太平洋最大的边缘海,其北部陆缘盆地深水区位于琼东南与珠江口盆地南侧.通过对该地区烃源条件、储层条件、圈闭条件及成藏模式等的初步研究,认为其具有良好的石油地质条件,有效勘探面积和勘探潜力巨大,具有良好的勘探前景.坎坡斯盆地位于巴西大西洋大陆边缘,是一个中生代到古新近纪含油气盆地,其内部的Garoupa, Carapeba, Namorado, Roncador, Marlim等深水油田的地质储量十分丰富,随着各个油田开发的深入,对该地区的深水含油气系统有了更加清晰的了解.本文通过两个地区在构造演化,烃源条件,储层条件,圈闭条件以及成藏模式的对比研究,对南海北部陆缘盆地深水区有了进一步的认识.  相似文献   

19.
The physical mechanisms responsible for hydrocarbon migration in carrier beds are well understood. However, secondary migration is one of poorly understood facets in petroleum system. The Carboniferous Donghe sandstone reservoir in the Tarim Basin's Hudson oilfield is an example of a secondary (or unsteady) reservoir; that is, oil in this reservoir is in the process of remigration, making it a suitable geologic system for studying hydrocarbon remigration in carrier beds. Experimental methods including grains containing oil inclusions (GOI), quantitative grain fluorescence (QGF) and quantitative grain fluorescence on extract (QGF-E) -- together with the results from drilling, logging and testing data -- were used to characterize the nature of oil remigration in the Donghe sandstone. The results show that (1) significant differences exist between paleo- and current-oil reservoirs in the Donghe sandstone, which implies that oil has remigrated a significant distance following primary accumulation; (2) due to tectonic inversion, oil remigration is slowly driven by buoyancy force, but the oil has not entered into the trap entirely because of the weak driving force. Oil scarcely enters into the interlayers, where the resistance is relatively large; (3) the oil-remigration pathway, located in the upper part of the Donghe sandstone, is planar in nature and oil moving along this pathway is primarily distributed in those areas of the sandstone having suitable properties. Residual oil is also present in the paleo-oil reservoirs, which results in their abnormal QGF-E. A better understanding of the characteristics of oil remigration in the Donghe sandstone in the Hudson oilfield can contribute to more effective oil exploration and development in the study area.  相似文献   

20.
A Natural active oil seepage occurs at the intersection of the NW-oriented rift coastal fault and a NE-oriented cross fault which bound the southwest dipping Little Zeit tilted fault block at the southwestern side of the Gulf of Suez, Egypt. Detailed surface geological mapping followed by subsurface mapping using aeromagnetic, seismic and borehole data of Ras El Ush oilfield (the nearest oil field to the seepage) provide a reliable hydrocarbon migration pathway model of the area.The proposed model suggests that hydrocarbons migrated upward at the intersection of a NE-oriented and the NW-oriented rift coastal faults where they found their way to the surface. The Nubia Sandstone occurs south of Ras El Ush oilfield in a trap door structure and probably entrapped some of the migrating hydrocarbons while a probable oil-water-contact at −1000 m which resulted into the migration of hydrocarbon through the damage zone of the northeast fault.The original oil in place of the predicted reservoir is estimated to be more than 47.5 MMBO which encourages the design makers for more investigation of this reservoir to increase its certainty and putting it in the plan of the future investments.  相似文献   

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