共查询到19条相似文献，搜索用时 109 毫秒
1.
《海洋地质前沿》2021,(4)
东海陆架盆地丽水凹陷主力烃源岩为古新统月桂峰组湖相泥岩,已发现油气以天然气为主,含少量凝析油,与以原油为主的中国东部典型断陷湖盆存在差异。对月桂峰组湖相泥岩进行了综合评价,发现其存在不能生烃的死碳,烃源岩的热演化成熟度与烃源岩形成石油的转化参数之间存在差异。月桂峰组有机质主要来源于陆源有机质,湖相水生生物来源的比例变化较大。烃源岩地球化学特征与典型湖相烃源岩存在差异。总结了湖盆类型对烃源岩的控制因素以及不同湖盆类型烃源岩形成油气的主要特征,并与月桂峰组湖相泥岩及已发现油气特征进行了对比,表明月桂峰组沉积期发育过补偿和平衡补偿湖盆。月桂峰组泥岩为非典型湖相烃源岩。 相似文献
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北部湾盆地北部涠西南凹陷多口钻井已获得高产油气流系列突破，其主力烃源岩层系为始新统流沙港组二段（流二段），但紧邻南侧的海中凹陷目前暂无商业油气发现。流二段既发育有深湖-半深湖相的烃源岩，同时在主力烃源岩段也发育有湖底扇储层，因此，研究海中凹陷潜在生烃层系（烃源岩、湖底扇储层）沉积体系发育规律对今后勘探开发具有指导意义。以高精度三维地震资料及测井资料为基础，通过岩芯相、测井相、地震相、地震属性的综合分析，探讨流二段沉积体系发育规律，建立沉积模式。研究表明：流二段主要发育滨浅湖、深湖-半深湖、湖底扇及辫状河三角洲4种沉积体系类型；在北陡南缓的半地堑构造样式控制下，北部陡坡带及洼槽带发育深湖-半深湖相，同时接受北部、东部2个物源方向的供源，分别在西洼、东洼发育湖底扇相，南部缓坡带发育滨浅湖及辫状河三角洲相。海中凹陷流二段好烃源岩主要发育在初始湖泛面层序位置（ts），湖底扇主要发育在湖泊扩张体系域内（TST），反映了在断陷湖盆背景下，构造沉降因素控制烃源岩发育程度强于湖平面变化因素。研究可为半地堑型断陷湖盆深湖-半深湖相烃源岩与湖底扇储层发育层序位置及共生模式的建立提供参考。 相似文献
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珠-坳陷古近纪陆相湖盆发育优质烃源岩,通过对文昌组、恩平组泥岩系统取样,进行常量、微量元素、同位素含量等分析,优选出对环境敏感的元素与元素比值,系统分析了珠-坳陷烃源岩形成时的古环境,包括古盐度、古水深、氧化还原条件、古气候及古水体的封闭性,并建立了有机碳与环境敏感元素比值的定量关系。开展优质烃源岩发育的水化学性质研究,明确研究区优质烃源岩形成演化所具有的古环境特征,最终探讨了文昌组优质烃源岩的发育模式。研究结果表明,珠-坳陷(除韩江凹陷无样本点)文昌期温暖略干气候条件下,湖盆水体主要为淡水-微咸水,发育中-深湖相,整体表现为开放-半封闭、还原—强还原的环境,极利于有机质的保存和优质烃源岩的发育,各凹陷古环境差异不大。烃源岩质量与咸度、水深、还原条件呈正相关,共同影响了优质烃源岩的发育。总之,温暖略干、微咸、深水及强还原、开放-半封闭环境共同控制了珠-坳陷优质烃源岩的发育。 相似文献
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南黄海海域广泛分布了海相古生界,区域地质研究表明,南黄海海相古生界主要发育4套烃源岩层系,分别为下寒武统幕府山组泥质烃源岩,上奥陶统-下志留统五峰组-高家边组泥质烃源岩,下二叠统栖霞组灰质烃源岩和上二叠统龙潭-大隆组泥质烃源岩。通过对这4套烃源岩沉积特征及地球化学实验数据分析,开展了烃源岩地化特征和生烃潜力的评价。评价结果认为,下寒武统幕府山组、下二叠统栖霞组烃源岩有机质丰度高,类型好,生烃潜力高,为好-最好烃源岩;上二叠统龙潭组、大隆组烃源岩,其有机质丰度高,但有机质组成以陆源有机质为主,为较好烃源岩;奥陶-志留系为一般烃源岩,在此基础上,计算南黄海地区的天然气资源量为2.75万亿m~3。 相似文献
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地震属性法在南黄海北部盆地勘探新区烃源岩厚度预测中的应用 总被引：1，自引：0，他引：1
新区、深层和深水等低勘探程度地区是今后油气勘探的重要方向,而烃源岩厚度预测则是沉积盆地勘探新区烃源岩评价的重要问题。以南黄海北部盆地勘探新区东北凹陷的烃源岩早期评价为背景,基于地震反射特征追踪东北凹陷内烃源岩的发育层位和空间展布研究成果,首次应用地震属性方法对东北凹陷的主力烃源岩(上白垩统泰州组和古新统阜宁组)厚度进行了初步预测,并结合地震速度岩性分析法对本区泰州组烃源岩厚度的预测结果加以验证。结果表明南黄海盆地东北凹陷泰州组烃源岩较阜宁组烃源岩分布广且厚度大,西次洼为东北凹陷主力生烃洼陷。地震属性法是沉积盆地勘探新区内定量化预测烃源岩厚度的一种行之有效的新方法,其对于类似盆地勘探早期的烃源岩评价研究也具有非常重要的借鉴意义。 相似文献
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月桂峰组是丽水-椒江凹陷的主力烃源岩层系。丽水-椒江凹陷在月桂峰组沉积时期为强断陷期,构造分割性强,沉积环境相对封闭,内部多个次洼的湖相烃源岩发育特征不清。为明确丽水-椒江凹陷内各富烃次洼中月桂峰组烃源岩发育条件及空间展布规律,进一步指导该区的油气勘探,利用钻井、岩芯、地球物理、地球化学及古生物等资料,基于湖盆演化动态全生命周期过程,提出“早期断层活动速率、中期母岩性质和遮挡条件、晚期火山活动”联合控制丽水-椒江凹陷4个次洼优质烃源岩的发育。在地质认识约束下,基于多属性神经网络深度学习,对中-深湖相烃源岩的空间展布进行了定量刻画。结合优质烃源岩的发育机制和中-深湖相烃源岩分布范围,对4个主要次洼内烃源岩的发育情况进行综合评价。结果表明,椒江A洼为Ⅰ类富烃次洼,丽水A洼和丽水C洼为Ⅱ类次富烃次洼,丽水B洼为Ⅲ类生烃次洼。 相似文献
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《海洋地质与第四纪地质》2017,(2)
惠州凹陷是珠江口盆地已经证实的富生烃凹陷,存在文昌组和恩平组两套有效烃源岩,一直以来都是以文昌组中深湖相烃源岩为勘探重点。随着勘探的深入,惠州地区以恩平组为代表的浅湖-沼泽相烃源岩的贡献越来越明显,惠州凹陷东部新区基本都为浅湖-沼泽相烃源岩供烃,周边井钻探证实该套烃源岩已经成藏。通过构造-结构剖析、物源分析、地震相调研对比、沉积体系细致研究以及对浅湖-沼泽相烃源岩的特征分析,揭示了惠东地区浅湖-沼泽相烃源岩优势发育机理。经过计算,惠东新区浅湖-沼泽相烃源岩资源量为8.6亿t,占到惠东地区总资源量的3/4,具有较大的勘探潜力。在总结惠东新区浅湖-沼泽相烃源岩特征的基础上优选出惠东新区浅湖-沼泽相烃源岩最有利勘探区带。本次研究摆脱了惠州凹陷单一烃源岩勘探束缚,推动了新区勘探进程。 相似文献
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《海洋地质前沿》2021,(10)
根据烃源岩生物标志化合物、孢粉藻类组合及分析,并结合整体沉积背景,分析白云凹陷不同相带烃源岩的地球化学特征,并确定不同相带烃源岩的成藏贡献。研究表明,文昌组中深湖相烃源岩有机质丰度属于中等级别,有机质类型为Ⅱ_1型,来源为藻类等水生生物,其干酪根δ~(13)C值最轻,δ~(13)C值-28‰。恩平组浅湖相和文昌组浅湖相有机质均来源于陆源高等植物,干酪根δ~(13)C值约为-27‰,有机质丰度属于中等-极好级别,有机质类型为Ⅱ_2-Ⅲ型。恩平组海侵湖相烃源岩富海相沟鞭藻及三芳甲藻甾烷,干酪根δ~(13)C值最重,约为-25‰。白云凹陷原油δ~(13)C值主要介于-28‰～-27‰,主要来源于文昌组和恩平组的浅湖相烃源岩,原油类型的分布受沉积相带的控制,个别近洼陷的井存在文昌组中深湖相烃源岩的贡献,恩平组海侵型烃源岩对成藏几乎无贡献。 相似文献
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烃源岩是油气生成的物质基础。利用最新采集的高品质二维地震资料和综合研究成果,在中建南盆地内划分出4套地震层序,识别了5个不整合地震反射界面。通过分析盆地沉积演化特征,推测中建南盆地发育3套烃源岩,分别为中始新统湖相烃源岩、上始新统—渐新统湖相和海陆交互相烃源岩以及下—中中新统海相烃源岩。通过对其周边盆地进行类比分析,厘定了3套烃源岩的地震相特征;对不同沉积相带泥岩百分含量进行赋值,最终判识推测了中建南盆地新生代3套烃源岩泥岩厚度及分布特征。本研究可为盆地下一步油气资源评价、有利二级构造带分析和勘探部署提供参考。 相似文献
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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
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在烃源岩分布特征、有机质丰度、类型和成熟度分析的基础上,运用含油气盆地数值模拟技术,定量恢复了烃源岩热成熟演化史,探讨了油气差异分布特征。研究表明,文昌A凹陷各层系烃源岩分布广,厚度大,有机质丰度高;有机质类型文昌组偏Ⅱ1型,恩平组偏Ⅲ型,二者现今多处于高成熟—过成熟阶段。凹陷内烃源岩成熟时间早(文昌组约45.5Ma),现今成熟度高,以干气生成为主;凹陷边缘烃源岩成熟时间较晚(文昌组约30.0Ma),现今成熟度相对较低,以石油生成为主。凹陷现今油气差异分布的格局受制于有机质类型差异和热演化史不同,且下一步油气勘探方向,凹陷内以天然气为主,凹陷边缘以石油为主。 相似文献
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渤海湾盆地渤中凹陷古近系沉积体系演化及物源分析 总被引：22，自引：0，他引：22
综合运用地质、测井、地震及分析化验等资料,对渤海湾盆地渤中凹陷古近系沉积体系进行了较深入的研究,研究表明渤中凹陷古近系的沉积体系主要受构造升降和湖平面变化的控制,经历了3期裂陷和湖侵,发育5套沉积体系,其中沙河街组沉积时期为裂陷期,以扇三角洲、湖底扇沉积为主,并发育特征的滩坝及浅水台地相沉积;东营组沉积时期为湖侵期,主要发育大型湖泊三角洲沉积,并逐渐向辫状河相过渡。构造及沉积体系分析认为,沙三段沉积时期物源丰富,主要来自石臼坨凸起、渤南和庙西凸起,沙一、二段沉积时期物源有限,东三沉积期物源主要来自石臼坨和沙东南凸起,东二沉积期大面积的湖侵使得本区处于浅湖-半深湖环境,凹陷周边大量古水系将石臼坨凸起、沙垒田凸起的物源带入凹陷中沉积,使得大型三角洲叠覆体广泛发育。 相似文献
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通过借助层序地层学理论、构造古地貌分析、古生物资料、沉积速率与可容纳空间关系对比,以及典型地震相识别、地震相与沉积相剖面及平面分析等,结合区域地质资料及前人的研究成果,对白云南洼恩平组烃源岩的叠置关系、影响因素、空间展布规律及发育模式进行了研究,得到如下认识:白云南洼恩平组对应一个完整的二级层序,可细分为3个三级层序,自下至上为SQ1、SQ2、SQ3,海平面总体为上升特征,SQ3的最大海泛面对应了整个恩平组二级层序的最大海泛面;白云南洼恩平组为局限浅海环境,具备发育较好海相烃源岩的条件,稳定半封闭的古构造背景,有利于烃源岩有机质的富集保存;沉积速率小,且小于可容空间增长速率,沉积物向陆退积,沉积水体深度变大,利于海相烃源岩的发育;恩平组烃源岩为大陆边缘半闭塞—欠补偿—湿润海湾模式,优质烃源岩主要发育在受隆起及断层遮挡形成的海湾区。 相似文献
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南黄海盆地北部坳陷古近系沉积特征及其沉积演化 总被引：1，自引：0，他引：1
南黄海盆地经历了多年油气勘探,无论是在中生界还是新生界,至今未获得油气突破。新生界储层具有优越的储集条件,故重点分析了古近系阜宁组和三朵—戴南组的沉积特征及其沉积演化特征。以钻井和测井资料为基础,将阜宁组和三朵—戴南组划分为4种沉积相类型,即河流相、扇三角洲相、三角洲相和湖相,其中河流相在研究区可划分为辫状河流相和曲流河流相;并且分析了各沉积相、沉积亚相和沉积微型的岩电性特征。仔细解剖地震反射特征,进行阜宁组和三朵—戴南组地震相分析,以单井相分析为基础,解析各地震相沉积意义。根据瓦尔特定律,将单井沉积相分析与地震相分析充分结合,分析各层段沉积相分布特征。阜宁组主要发育曲流河流相、扇三角洲相、滨浅湖相和半深湖相;三朵—戴南组主要发育辫状河流相、扇三角洲相和滨浅湖相。根据区域构造演化特征,结合沉积相分析,深入分析了研究区古近系阜宁组至三朵—戴南组的沉积演化特征。 相似文献
16.
A geological and geochemical study has been carried out to investigate the relationships between major mud volcano structures and deep fluid migration in the Cheleken peninsula, in the South Caspian Basin. The fluid geochemistry allowed the origin and migration of the saline waters and the hydrocarbons to be deduced along with the regional source and reservoir rocks. The emitted waters formed by the mixing of deep highly saline water from the main source rocks of the Maykop Fm with the Caspian-like pore water contained in the Pliocene reservoirs. The water composition is very similar to that emitted by the mud volcanoes in Azerbaijan, allowing comparisons to be done between the reservoirs in the western and eastern sides of the South Caspian Basin. The associated oil is derived from a mixed type II/III kerogen deposited in a sub-oxic marine environment and generated during the early oil window. The oil biomarkers indicate that the source rock is the Maykop Fm., as previously determined for the other areas of the South Caspian Basin.The spontaneous emissions, showing different morphologies, are mainly aligned along normal and transtensive fault systems, which provide effective pathways for rapid fluid ascent from deep reservoirs to the surface. 相似文献
17.
Charging of oil fields surrounding the Shaleitian uplift from multiple source rock intervals and generative kitchens,Bohai Bay basin,China 总被引：1，自引：0，他引：1
This paper discusses origin and charging directions of oil fields on the Shaleitian Uplift, Bohai Bay basin. The Shaleitian Uplift is a footwall uplift surrounded by three sags containing mature source rocks. The origins of the four oil fields on the Shaleitian Uplift, both in terms of source rock intervals and in terms of generative kitchens, were studied using biomarker distributions for 61 source rock samples and 27 oil samples. Hierarchical cluster analysis using 12 parameters known to be effective indicators of organic matter input and/or depositional conditions allowed the identification of six oil types or classes. These six oil classes could then be linked to three distinct source rock intervals ranging in age from 43.0 Ma to 30.3 Ma. The third member (43.0–38.0 Ma in age) and first member (35.8–32.8 Ma) of the Eocene Shahejie Formation, and the third member of the Oligocene Dongying Formation (32.8–30.3 Ma) each sourced one class of oil. The other three classes represent mixtures of oil generated from multiple source rock intervals. Traps on the Shaleitian Uplift were charged in the east by oil generated from the Eocene Shahejie Formation in the Bozhong Sag, in the southeast by oil generated from the Eocene Shahejie and then Oligocene Dongying formations in the southwestern part of the Bozhong Sag and/or in the eastern part of the Shanan Sag, and in the southwest by oil generated from the Eocene Shahejie Formation in the western part of the Shanan Sag. The estimated migration distances range from less than 5 km to about 20 km. The compositional heterogeneity within fields and multiple-parameter comparisons between oils from nearby wells in different fields have proven to be a powerful tool to determine the in-filling histories of oil fields in cases where multiple source rock intervals and multiple generative kitchens exist. 相似文献
18.
Source rock formation influenced by river-delta system, especially in continental margin basins, is still poorly understood. This article aimed to reveal the effect of river-delta system on the formation of the source rock by taking the Baiyun Sag of the Pearl River Mouth Basin for example. Paleo-Pearl River began to develop since the Enping Formation, providing abundant organic matter beneficial for the formation of the source rocks in the Baiyun Sag. The main controlling factor of source rock formation in the Baiyun Sag is terrestrial organic matter supply rather than the paleoproductivity or redox conditions. Low Al/Ti and P/Ti ratios suggest low marine productivity, which may be associated with a large number of terrigenous detritus input, occupying about 43.04%–94.91%. There is a positive correlation between the oleanane/C30hopane ratio and the TOC value, showing that terrigenous organic matter controls the source rock formation. The size of the delta below Pearl River estuary determines the extent of terrestrial organic matter supply. Source rocks with high organic matter abundance mainly formed in delta environment, and those in neritic environment in Enping and Zhuhai Formations also have high TOC values as a result of adequate terrestrial organic matter supply. 相似文献
19.
Interest in factors controlling lacustrine source rock deposition has increased over the last few decades because this type of deposits contain significant petroleum resources. Generally, tectonic subsidence and climate are the two root causes as they control the accommodation potential, water column properties and sources of organic matter. In this study, coupling organic geochemical and elemental geochemical data, two potential source rocks, i.e., the Eocene Wenchang Formation (E2w) and Oligocene Enping Formation (E3e) were investigated. Two models were finally raised to explain deposition of the two set of source rocks according to their paleoclimatic and tectonic properties. The source rock potential shows a strong heterogeneity. The second member of the Eocene Wenchang Formation (E2w2) is characterized by high organic matter content and oil-prone kerogen type. In contrast, the first member of the Eocene Wenchang Formation (E2w1) and the Oligocene Enping formation (E3e) are characterized by low organic matter content and gas-prone kerogen type. The primary productivity and depositional environment exhibit notable differences between the two potential source rocks horizons and show an obvious variation from the depocenter to the slope and can be best explained by the coevolution of tectonic subsidence and climate. During the E2w depositional stage, low sediment supply led to mudstone deposited in deep lacustrine environment and resulted in underfilled lake basin. The low water inflow provided little terrigenous organic matter (low bicadinane, perylene and floranthene contents) and oxygen. Besides, the low area/depth ratio impeded the water circulation, thus resulted in shallow thermocline and anoxic-suboxic bottom environment (abundant dibenzothiophene and high C35/C3122S hopane ratios). Therefore abundant algae, which contributed to the high amorphous organic matter (AOM) content, can be preserved. The warm and wet climate (high Mn/Mg ratios) gave birth to autochthonous organism, such as dinoflagellates and Pavlova gyrans (abundant 4-methyl sterane). During the E3e depositional stage, the sufficient sedimentary supply resulted in expanding, shallow lacustrine and swamp environment. The higher area/depth ratio and high sediment supply made environment unstable and can be strongly influenced by external environment (broader range of Mn/Mg ratios). Enough terrigenous organic matter (TOM) was transported to the slope but little to the depocenter. The slightly hot and dry climate (low Mn/Mg ratios) led to decreasing autochthonous organism and evaporation environment. The shallow water depth and relative dry climate resulted in saline, suboxic-dysoxic acid bottom environment. The co-variation of organic and inorganic indexes indicates the combination is a valid method in reconstructing source rock depositional models. 相似文献