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1.
东海陆架盆地是在元古界、古生界复杂基底上发展形成的中—新生代叠合含油气盆地,蕴藏丰富的油气资源,对中国的能源战略意义重大,东海陆架盆地中生界将是未来中国东部油气勘探新区及重要领域。台北坳陷位于东海陆架盆地西部坳陷带南部,中生界陆相河湖沉积体系发育福州组泥岩、石门潭组泥岩两套主力烃源岩。根据台北坳陷烃源岩、储盖组合、输导体系等油气藏形成的静态要素为基础,结合油气来源和成藏期次分析,研究其成藏过程,明确了台北坳陷以福州组、石门潭组为主力烃源,福州组、石门潭组及始新世瓯江组砂体为主要储层,油气沿着凹陷边缘的砂体、活动的断层运移,砂体尖灭和断层封闭时期,油气早期成藏;始新世末-渐新世的全盆性挤压反转,油气重新调整聚集成藏。从而建立起台北坳陷中生界早期成藏,后期调整的成藏模式。 相似文献
2.
川中地区龙王庙组的天然气勘探已经取得重大发现,然而大巴山前缘地区龙王庙组尚未取得勘探突破,原因可能是缺少油气成藏条件研究。从烃源岩、沉积相、储层、构造条件等多方面入手,探讨了该区龙王庙组的油气成藏条件,结果表明:(1)该区寒武系发育筇竹寺组优质烃源岩,烃源条件较好;(2)该区龙王庙组储层主要储集空间为粒间溶孔、晶间溶孔,储层呈现低孔、低渗特征,大巴山前缘地区龙王庙组的储层主要发育在台缘带颗粒滩叠合岩溶发育区城口—奉节—兴山—利川一带;(3)该区寒武系油气成藏条件好,"筇竹寺组烃源岩+龙王庙组储层+高台组厚层膏盐岩盖层"这套优越生储盖组合为油气藏的形成奠定了基础。圈闭形成时间与油气运移匹配,有利于油气聚集。在成藏条件分析的基础上,认为城口—巫山地区为大巴山前缘地区龙王庙组的有利勘探区带。 相似文献
3.
在对南黄海盆地海相中、古生界烃源条件和后期保存条件研究的基础上,运用盆地模拟手段并结合前人研究成果,对海相地层烃源岩的排烃史进行了模拟,计算了海相地层油气资源量,从而进行了海相油气资源潜力的分析;同时通过对海相上构造层和下构造层两套含油气系统成藏条件的研究,预测了盆地内海相油气资源的有利运聚区,进而指出南黄海盆地海相油气勘探的有利区,为下一步南黄海盆地的勘探部署提供了依据。研究表明,南黄海盆地海相下构造层和海相上构造层栖霞组、龙潭组—大隆组烃源岩推测为好的烃源岩,海相上构造层青龙组烃源岩推测为中等—好的烃源岩;盆地海相地层具有一定的油气资源潜力,油气资源总量为35.37×10^8t,且在纵向上,油气资源主要来自海相下构造层烃源岩系,在平面上主要分布于南部坳陷;盆地海相地层存在两类油气资源勘探有利区,其中,最有利区位于中部隆起区南部、南部坳陷区和勿南沙隆起区北部。 相似文献
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5.
珠二坳陷是已证实的生烃坳陷,坳陷内有两套主要烃源岩即始新统文昌组和渐新统恩平组地层,它们在白云凹陷和开平凹陷正分别处于生成干气和生油的高峰,珠二坳陷因斯 断裂活动的差异性而导致了成藏类型的多样性,形成了下生上储,自生自储以及二者的复合型油气藏,圈闭类型在该区也比较丰富,除了有常见的大中型背斜构造外,还有大型的地层圈闭,是进行勘探,寻找油气的有利地区。 相似文献
6.
《海洋地质与第四纪地质》2014,(5)
通过对南鄱阳坳陷所发现原油的储层孔渗特征、烃源岩地球化学特征、"源—储"接触关系、原油物理性质及原油显示特征进行分析,初步证明了所发现原油为致密油,确认了南鄱阳坳陷致密油的存在。结合南鄱阳坳陷致密油成藏地质要素、油源对比及流体包裹体成藏年代学研究,揭示了南鄱阳坳陷致密油的主要烃源岩为乐平组老山段含煤泥页岩,致密油为喜马拉雅早期成藏,总结了官山段致密油的成藏过程。在南鄱阳坳陷油气显示特征研究的基础上,初步总结出沉积相、烃源岩及断层为南鄱阳坳陷致密油的成藏主控因素。结合南鄱阳坳陷致密油的成藏条件及主控因素分析,总结了官山段致密油的富集规律,阐述了南鄱阳坳陷具备广阔的致密油勘探前景。 相似文献
7.
在对济阳坳陷古生界潜山分布和油藏类型分析的基础上，通过对几个地区典型油气藏的解剖，研究了潜山油藏的成藏机理和成藏模式。综合分析认为潜山的成藏条件与所处的区域应力场环境、油气源条件、油气运移通道、反向断层的封堵及储集空间密切相关。依据潜山位置与烃源岩系接触关系及运移通道特征，把济阳坳陷潜山油藏成藏模式可归纳为它源（自源）-断块式潜山成藏模式、它源（自源）-褶皱式潜山成藏模式和它源-残丘式潜山成藏模式3种基本类型，分别论述了其基本特征、油气藏类型及典型实例，这对类似地区潜山的勘探具有理论和实际指导意义。 相似文献
8.
饶阳凹陷潜山油气分布特征及富集规律 总被引：2，自引：0，他引：2
饶阳凹陷是冀中坳陷潜山油气勘探的重点地区之一。综合应用现代油气成藏、地球物理、地球化学等理论和方法,对饶阳凹陷潜山油气成藏的地质条件进行了分析。结果表明,该区带油源丰富,储集条件好,发育多套有效的储盖组合,各成藏要素时空配置良好,具有形成大规模油气田的有利条件。根据已发现油气藏构造特征、成藏条件及油藏类型得出,研究区油气藏集中分布于潜山顶、潜山坡及潜山内幕。在此基础上,提出了潜山油气藏多分布于近源的断裂带附近,水动力承压区、深凹陷、古隆起的叠置区,断棱、峰顶、内幕高点等位置的油气富集规律。 相似文献
9.
珠江口盆地珠四坳陷整体水深超过1 500 m，属极低勘探程度区域，钻井发现的油气显示证实了该区存在烃源岩。地震资料揭示古近系是主力烃源岩发育层系，沉积厚度及面积均较大。珠四坳陷作为南海北部向超深水迈进的油气勘探新区，其各凹陷的石油地质条件亟待剖析。在珠江口盆地6种断陷形成机制认识的基础上，通过对新采集地震资料的系统分析，将珠四坳陷划分大西洋贫岩浆型大陆边缘的壳间韧性流变型、大西洋富岩浆型大陆边缘的壳上岩浆底侵型、大西洋贫岩浆型大陆边缘的壳上先存拼合型3类断陷结构。运用2Dmove软件及去压实技术恢复各个洼陷沉降速率和伸展速率，结合大量地震剖面深入研究了珠四坳陷地质结构及其对烃源岩发育的影响，明确了不同断陷结构下烃源岩发育背景的差异，以此认为荔湾、鹤山凹陷烃源岩发育条件优越，可作为南海北部超深水地区的重要勘探突破点。 相似文献
10.
《海洋地质与第四纪地质》2015,(6)
以多道反射地震剖面和钻井资料为基础,采用合成地震记录和地震属性分析的方法,开展南黄海盆地北部坳陷白垩系地层沉积及油气地质特征的研究。研究结果表明,白垩系地层在坳陷内保存较完整,厚度较稳定,斜坡部位变形微弱,连续性好,坳陷沉积中心变形强烈,小断层发育、密集,连续性较差,各层组厚度变化不大,可在全坳陷追踪对比。泰州组为良好的烃源岩,赤山组下部和浦口组为良好的储集层,泰州组和赤山组上部构成区域性盖层。白垩系内部及上、下地层之间形成了多类型的油气生-储-盖组合关系。断裂构造发育的凹陷深部是油气聚集的有利场所。采用三维地震资料进一步开展本项研究工作对南黄海前新生界油气勘探具有重要意义。 相似文献
11.
Yongcai Yang Xiaojun Xie Youchuan Li Gang Guo Xiaoying Xi Wenjing Ding 《海洋学报(英文版)》2023,42(3):254-269
The Xihu Depression in the East China Sea Shelf Basin is a large petroliferous sedimentary depression, in which oil and gas reservoirs were mainly discovered in the Pinghu Slope and the central inversion zone. The oil-gas source correlation in the Xihu Depression was analyzed by hydrocarbon generating thermal simulation data via gold-tube pyrolysis experiments. The results indicated that the oil and gas in the Xihu Depression were mainly derived from coal measure source rocks of the Eocene Pinghu Formation. Therefore, the identification of coal seams is extremely crucial for evaluating coal measure source rocks in the Pinghu Formation in the Xihu Depression. Geochemical and petrological characterization pointed to input of terrigenous organic matter and redox conditions of the depositional environment as factors that govern the ability of the coal measure source rocks in hydrocarbon generation in the Xihu Depression. In this regard, the sedimentary organic facies in the Pinghu Formation were classified into four predominantly terrigenous and one mixed-source subfacies, which all varied in carbon and hydrogen content. The coal measure source rocks in the carbon- and hydrogen-rich tidal flat-lagoon exhibited the highest hydrocarbon generation potential, whereas the mudstone in the neritic facies was the poorest in its hydrocarbon yield. These results suggested that the coal measure source rocks in the Pinghu Formation likely developed in the Hangzhou Slope and the Tiantai Slope, both representing promising sources for oil and gas exploration. 相似文献
12.
近年来,中石油和中石化在四川盆地雷口坡组雷四3亚段的勘探陆续取得重要进展,展示了良好的勘探前景。笔者结合新钻探井和最新研究成果,从地层、沉积相、烃源岩、储层和成藏等多方面采用烃源对比、埋藏史及烃源岩热演化史、包裹体测温等方法对四川盆地雷四3亚段的含油气地质条件进行了进一步分析,总结了其油气成藏特征,提出了有利勘探区带,以期有助于拓展四川盆地雷口坡组的勘探领域。研究结果表明:雷四3亚段天然气以雷口坡组和须家河组烃源岩混合来源气为主;储集空间以粒间溶孔、晶间溶孔为主,属低孔低渗储层;雷四3亚段气藏为2期成藏,烃源岩于中、晚侏罗世进入生烃高峰;雷四3亚段具有构造和构造-岩性地层2种气藏类型,龙门山山前断褶带为构造气藏的有利勘探区,新津-邛崃斜坡带与梓潼-盐亭斜坡带是构造-岩性地层气藏的有利勘探区。 相似文献
13.
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
14.
南黄海中—新生代盆地经历了中生代印支运动以来的多期构造运动改造,凹陷分隔性强,各凹陷烃源岩发育条件差异大。利用地质调查获得的最新资料,从烃源岩有机质丰度、类型、成熟度以及成熟烃源岩体积参数等方面,重点探讨了中—新生代陆相盆地生烃条件好和较好的7个凹陷的烃源潜力及中—古生界海相烃源岩的演化特征。结果表明,北部坳陷的北部凹陷、东北凹陷以及南部坳陷的南四凹陷属于一类生烃凹陷,北部坳陷的南(西)部凹陷、南部坳陷的南五凹陷属于二类生烃凹陷,而北部坳陷的中—东部凹陷以及南部坳陷的南七凹陷为三类生烃凹陷。印支构造面之下的中—古生界海相层系是盆地内另一套重要烃源岩,其有机质热演化程度分异明显,在中—新生代凹陷间低凸起区最低,坳陷周围的隆起区最高,新生代凹陷区"基底层"内热演化程度介于上述两者之间。 相似文献
15.
Identification of the main hydrocarbon source rocks of the large Puguang gas field (northeastern Sichuan Basin, southwest China) has been the subject of much discussion in recent years. A key aspect has been the lack of a comprehensive understanding of the development of hydrocarbon source rocks of the Upper Permian Longtan Formation, which had been thought to contain mainly coal seams and thick carbonate layers. In this paper, based on geological data from more than ten wells and outcrops and their related mineralogy and geochemistry, we investigated the depositional environment and main factors controlling organic matter enrichment in the Longtan Formation. We propose a model which combines information on the geological environment and biological changes over time. In the model, organic matter from prolific phytoplankton blooms was deposited in quiescent platform interior sags with rising sea-levels. During the Longtan period, the area from Bazhong to Dazhou was a platform interior sag with relatively deep water and a closed environment, which was controlled by multiple factors including syngenetic fault settling, isolation of submarine uplifts and rising sea-levels leading to water column stratification. Although the bottom water was anoxic, the phytoplankton were able to bloom in the well-lit upper euphotic zone thus giving rise to a set of sapropelic black shales and marlstones containing mostly algal organic matter with minor terrestrial contributions. As a consequence, these rocks have a high hydrocarbon generation potentials and can be classified as high-quality source rocks. The area from Bazhong to Dazhou is a center of hydrocarbon generation, being the main source of reservoired paleo-oils and presently discovered as pyrobitumen in the Puguang gas field. The identification of these source rocks is very important to guide future petroleum exploration in the northeastern Sichuan Basin. 相似文献
16.
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
17.
R.F. Sachsenhofer B. Stummer G. Georgiev R. Dellmour A. Bechtel R. Gratzer S. Ćorić 《Marine and Petroleum Geology》2009
The Oligocene Ruslar Formation is a hydrocarbon source rock in the Kamchia Depression, located in the Western Black Sea area. Depositional environment and source potential of the predominantly pelitic rocks were investigated using core and cuttings samples from four offshore wells. In these wells the Ruslar Formation is up to 500 m thick. Based on lithology and well logs, the Ruslar Formation is subdivided from base to top into units I–VI. Dysoxic to anoxic conditions and mesohaline to euhaline salinities prevailed during deposition of the Ruslar Formation. Relatively high oxygen contents occurred during early Solenovian times (lower part of unit II), when brackish surface water favoured nannoplankton blooms and the deposition of bright marls (“Solenovian event”). Anoxic conditions with photic zone anoxia were established during late Oligocene times (units III and IV) and, probably, reflect a basin-wide anoxic event in the Eastern Paratethys during Kalmykian times. Organic carbon content in the Ruslar Formation is up to 3%. Autochthonous aquatic and allochthonous terrigenous biomass contribute to the organic matter. Relatively high amounts of aquatic organic matter occur in the lower part of the Ruslar Formation (units I and II) and in its upper part (unit VI). Diatoms are especially abundant in the lower part of unit VI. The kerogen is of type III and II with HI values ranging from 50 to 400 mgHC/gTOC. Units I and II (Pshekian, lower Solenovian) are characterized by a fair (to good) potential to produce gas and oil, but potential sources for gas and oil also occur in the Upper Oligocene units IV–VI. 相似文献
18.
The North Yellow Sea Basin ( NYSB ), which was developed on the basement of North China (Huabei) continental block, is a typical continental Mesozoic Cenozoic sedimentary basin in the sea area. Its Mesozoic basin is a residual basin, below which there is probably a larger Paleozoic sedimentary basin. The North Yellow Sea Basin comprises four sags and three uplifts. Of them, the eastern sag is a Mesozoic Cenozoic sedimentary sag in NYSB and has the biggest sediment thickness; the current Korean drilling wells are concentrated in the eastern sag. This sag is comparatively rich in oil and gas resources and thus has a relatively good petroleum prospect in the sea. The central sag has also accommodated thick Mesozoic-Cenozoic sediments. The latest research results show that there are three series of hydrocarbon source rocks in the North Yellow Sea Basin, namely, black shales of the Paleogene, Jurassic and Cretaceous. The principal hydrocarbon source rocks in NYSB are the Mesozoic black shale. According to the drilling data of Korea, the black shales of the Paleogene, Jurassic and Cretaceous have all come up to the standards of good and mature source rocks. The NYSB owns an intact system of oil generation, reservoir and capping rocks that can help hydrocarbon to form in the basin and thus it has the great potential of oil and gas. The vertical distribution of the hydrocarbon resources is mainly considered to be in the Cretaceous and then in the Jurassic. 相似文献