共查询到17条相似文献，搜索用时 116 毫秒
1.
东海西湖凹陷油气地质条件及其勘探潜力 总被引：5，自引：0，他引：5
以现代油气地质理论为指导,系统分析了东海陆架盆地西湖凹陷的烃源岩、储集岩、盖层及圈闭等油气系统形成的基本要素,并探讨了油气勘探潜力和方向.研究表明,西湖凹陷具备大、中型油气田形成的基本油气地质条件,具有巨大的油气勘探潜力,勘探前景广阔,存在多个有利的油气勘探领域. 相似文献
2.
目前东海陆架盆地的勘探形势良好,在新生界陆续发现多个油气田,但在盆地中生界尚未有大的勘探突破。为提高油气勘探效率,利用含油气系统的理论与方法对研究区白垩系油气成藏要素及成藏作用进行了分析,总结出了研究区油气成藏模式。结果表明:研究区白垩系烃源岩主要发育在基隆凹陷,岩性推测为海湾相暗色泥岩,有机质丰度高,类型好;储层主要为中―新生代砂岩,储集空间主要为原生孔隙和次生裂缝,白垩系砂岩整体为中孔中渗储层,新生界储集性能较好,并以始新统平湖组和渐新统花港组砂岩最为重要;中新生代盖层主要为泥岩,发育两套生储盖组合;受构造演化所控制,基隆凹陷可能经历了白垩纪晚期、古近纪、新近纪―至今3次生烃,其他地区只经历了后两次生烃;油气主要是通过优势输导砂体、不整合面、断裂和裂缝所组成的输导体系向周围圈闭运移;东海陆架东南部白垩系油气主要存在3种油气藏类型。本次研究结果可以为东海陆架盆地东南部白垩系的油气资源评估提供依据。 相似文献
3.
4.
本文从油气成藏条件角度,充分运用西湖凹陷地震,油气源对比,生烃强度和ＴＴＩ科技攻关,新成果以及油气化探,相领凹陷钻井揭示的古新统油气地质资料等,对西湖凹陷尚未钻井揭露的古新统成藏组合,进行了较全面油气地质条件分析,并认为该组合在保斜坡带某些有我块有着较好的油气成藏背景。 相似文献
5.
西湖凹陷位于东海大陆架边缘，地壳为相对软弱的过渡壳。西湖凹陷中新世末以前属于萎缩型盆地，上新世伴随冲绳海槽的形成才成为扩张性盆地。受构造控制盆地萎缩期沉积有以下3个特点：第一，整体表现为海退；第二，沉积范围逐次减小；第三，泥岩百分比越来越低，盖层条件越来越差。平湖组存在区域盖层，钻遇断块气藏；花港组存在局部盖层，背斜充满度高，断背斜充满度低，断块未成藏；新近系盖层条件更差，断背斜亦未能成藏。由此可见保存条件是西湖凹陷油气成藏的主控因素，保存条件好的领域是西湖凹陷下一步勘探的方向。 相似文献
6.
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
7.
琼东南盆地深水区L18气田上新统地层圈闭气田形成条件及成藏模式 总被引：2，自引：1，他引：1
近期在琼东南盆地超深水区发现了L18气田上新统地层圈闭气田，但在聚气背景、烃源岩、储层沉积成因及天然气输导体系等气田形成条件和成藏模式认识存在争议。通过对该气田形成条件的综合分析，认为上新世轴向古洼槽内地层圈闭、陵水凹陷东洼下渐新统崖城组浅海相烃源岩、上新统限制型重力流砂岩储层和渐新统-中新统断裂垂向沟源通道是形成上新统地层圈闭气田的4个基本条件。中中新世以来盆地中央继承性发育轴向古洼槽和限制型重力流沉积，随着后期地层沉积迁移、差异压实作用，上新统莺歌海组砂岩顶面在轴向洼槽内起伏，并被周边泥岩封盖、封堵，形成了地层圈闭；约3.4 Ma BP，陵水凹陷东洼下渐新统崖城组浅海相烃源岩生成了成熟天然气，沿渐新统-中新统断裂向上运移到上新统莺歌海组重力流沉积砂岩中，再侧向运移至地层圈闭中聚集成藏，具有"烃源岩、圈闭、断裂+砂岩输导层"三要素控藏的上新统地层圈闭成藏模式。 相似文献
8.
东海西湖凹陷浙东中央背斜带烃源岩生排烃史研究 总被引：9，自引：1，他引：9
为了深化西湖凹陷浙东中央背斜带油气成藏过程的研究，优化勘探目标选择，在烃源岩特征分析的基础上，应用动态数值模拟技术，定量恢复了研究区主要烃源岩层系的生排烃历史，研究表明，浙东中央背斜带主要发育4套烃源岩系，其中始新统平湖组泥岩与煤层为主力烃源岩，具较高的有机质丰度=生烃强度与排烃效率，烃类排出具阶段性、多期次幕式排烃的特点汉平湖组为源岩的油气系统应是本区油气勘探的主要目标。 相似文献
9.
为了研究渤海湾盆地埕北凹陷的勘探前景和油气成藏规律,基于埕北凹陷古近系隐蔽油气藏的勘探实践,探讨了埕北凹陷的沉积特点、沉积体系以及油气圈闭特征。对勘探地质资料的研究表明:埕北凹陷古近系主要沉积了沙河街组和东营组,其中沙河街组以沙三段为主,东营组地层较全;埕北凹陷古近系沉积具有多旋回性,具有多期次的沉积间断,凹陷南北沉积差异较大;埕北凹陷古近系主要发育了近岸水下扇、扇三角洲—滑塌浊积扇、远岸浊积扇、辫状河三角洲、低弯度河—泛滥平原、湖底扇等沉积体系,并对应形成了各类油气圈闭。这些圈闭都是油气成藏的有利储集体。以上结论表明,埕北凹陷古近系沉积特征有利于油气成藏。 相似文献
10.
西湖凹陷中-下始新统宝石组油气地质与勘探潜力 总被引：13，自引：0，他引：13
西湖凹陷是东海陆架盆地油气勘探潜力最好的凹陷之一。通过西湖凹陷宝石一井中下始新统宝石组井震资料,厘定了影响油气资源计算结果较大的关键参数,如烃源岩厚度、有机质油气产率、排聚系数等;建立了构造、沉积、孔隙度与油气生、运、聚模型,编绘了西湖凹陷宝石组生油岩厚度图、有机碳、Ro、生油气强度等值线图;采用BASIMS 4．5盆地综合模拟系统重现了西湖凹陷宝石组的地史、热史、生烃史、排烃史和运聚史,分析了宝石组空间展布特征与生、储、盖、圈、运、保等地质条件,提出并建立了宝石组合油气系统。利用多种方法定量计算的宝石组生烃量和资源量与西湖凹陷已证实的主力烃源岩系平湖组相似,认为宝石组是西湖凹陷又一重要烃源岩及油气勘探目的层系,拥有巨大的油气勘探潜力。 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.
13.
《Marine and Petroleum Geology》2012,36(1):154-165
This study aims at investigating hydrocarbon generation potential and biological organic source for the Tertiary coal-bearing source rocks of Pinghu Formation (middle-upper Eocene) in Xihu depression, East China Sea shelf basin. Another goal is to differentiate coal and mudstone with respect to their geochemical properties. The coal-bearing sequence has a variable organofacies and is mainly gas-prone. The coals and carbonaceous mudstones, in comparison with mudstones, have a higher liquid hydrocarbon generation potential, as reflected by evidently higher HI values (averaging 286 mg HC/g C) and H/C atomic ratios (round 0.9). The molecular composition in the coal-bearing sequence is commonly characterized by unusually abundant diterpenoid alkanes, dominant C29 sterane over C27 and C28 homologues and high amount of terrigenous-related aromatic biomarkers such as retene, cadalene and 1, 7-dimethylphenanthrene, indicating a predominantly terrigenous organic source. The source rocks show high Pr/Ph ratios ranging mostly from 3.5 to 8.5 and low MDBTs/MDBFs ratios (<1.0), indicating deposition in an oxic swamp-lacustrine environment. The coals and carbonaceous mudstones could be differentiated from the grey mudstones by facies-dependent biomarker parameters such as relative sterane concentration and gammacerane index and carbon isotope composition. Isotope and biomarker analysis indicate the genetic correlation between the Pinghu source rocks and the oils found in Xihu depression. Moreover, most oils seem to be derived from the coal as well as carbonaceous mudstone. 相似文献
14.
东海西湖凹陷平湖构造带异常压力与油气成藏 总被引：3，自引：0，他引：3
东海陆架盆地西湖凹陷平湖构造带深部普遍发育异常高压,对研究区的异常压力的分布特征、主导成因及其对油气成藏的影响进行了系统研究。平湖构造带深部储层和泥岩现今普遍发育超压,且不同区带超压主导成因不同;超压对有机质的热演化和烃类的生成无明显影响,对储集层物性有保存和改善作用,对油气运聚先起动力作用促进再运移,后起封堵作用形成聚集,对深部泥质盖层起超压封盖作用。 相似文献
15.
Geology and hydrocarbon accumulations in the deepwater of the northwestern South China Sea——with focus on natural gas 总被引：3，自引：0，他引：3
WANG Zhenfeng SUN Zhipeng ZHANG Daojun ZHU Jitian LI Xushen HUANG Baoji GUO Minggang JIANG Rufeng 《海洋学报(英文版)》2015,34(10):57-70
The deepwater of the northwestern South China Sea is located in the central to southern parts of the Qiongdongnan Basin(QDN Basin),which is a key site for hydrocarbon exploration in recent years.In this study,the authors did a comprehensive analysis of gravity-magnetic data,extensive 3D seismic survey,cores and cuttings,paleontology and geochemical indexes,proposed the mechanism of natural gas origin,identified different oil and gas systems,and established the model of hydrocarbon accumulations in the deep-water region.Our basin tectonic simulation indicates that the evolution of QDN Basin was controlled by multiple-phased tectonic movements,such as Indochina-Eurasian Plate collision,Tibetan Uplift,Red River faulting and the expansion of the South China Sea which is characterized by Paleogene rifting,Neogene depression,and Eocene intensive faulting and lacustrine deposits.The drilling results show that this region is dominated by marineterrestrial transitional and neritic-bathyal facies from the early Oligocene.The Yacheng Formation of the early Oligocene is rich in organic matter and a main gas-source rock.According to the geological-geochemical data from the latest drilling wells,Lingshui,Baodao,Changchang Sags have good hydrocarbon-generating potentials,where two plays from the Paleogene and Neogene reservoirs were developed.Those reservoirs occur in central canyon structural-lithologic trap zone,Changchang marginal trap zone and southern fault terrace of Baodao Sag.Among them,the central canyon trap zone has a great potential for exploration because the various reservoirforming elements are well developed,i.e.,good coal-measure source rocks,sufficient reservoirs from the Neogene turbidity sandstone and submarine fan,faults connecting source rock and reservoirs,effective vertical migration,late stage aggregation and favorable structural–lithological composite trapping.These study results provide an important scientific basis for hydrocarbon exploration in this region,evidenced by the recent discovery of the significant commercial LS-A gas field in the central canyon of the Lingshui Sag. 相似文献
16.
Shanshan Zhou Youchuan Li Jianping Li Wenjing Ding Xin Li Weilai Zhang 《海洋学报(英文版)》2023,42(3):138-150
The terrigenously-dominated marine shales which were deposited in the lower Eocene Pinghu Formation were thought to be a potential source rock in the Xihu Depression of the East China Sea Shelf Basin. However, the exceptionally high total organic carbon content (TOC, >6% on average) of the tidal sand ridge samples was not compatible with their sedimentary environment, indicating coal-bearing sedimentary debris may have been transferred from the coast to the ocean. In this study, new sights into the origins and supply of organic materials in the coastal environment were proposed in the neritic organic matter of the Eocene Pinghu Formation. A discriminant model was developed using plynofacies analysis data to pinpoint the source of organic materials in marine source rocks. The discrimination results suggested that marine mudstones were associated with tidal flat mudstones rather than deltaic ones. The biomarker characteristics of mudstones deposited in various environments support this assertion, indicating that the supply of plant materials in tidal flats is the primary organic matter source for the marine environment. The organic matter abundance was elevated in tidal flats due to their superior preservation conditions. Additionally, the lithological assemblage of tidal flats suggests that tidal currents can scour marshes and then transport dispersed terrigenous organic materials to neritic areas. These findings indicate that coal-bearing sedimentary debris was likely transferred from the coast to the ocean, and tidal currents are thought to be the dominant mechanism driving organic matter from the tidal to the marine environment. 相似文献
17.
浅论东海盆地海礁凸起的含油气性 总被引：1，自引：1，他引：1
肖国林 《中国海洋大学学报(自然科学版)》2001,31(2):243-248
勘探资料证实 ,西湖凹陷内生成的油气由生烃深凹向西部和南部的古斜坡带运移。凹陷内的局部构造大多形成于中新世末期的龙井运动 幕 ,圈闭形成期晚于油气主运移期 ,致使油气运移到比斜坡带更高的海礁凸起上保存或散失了。作者利用现有东海地震资料及西湖凹陷钻井、测井及油气资源评价结果从油气运移、聚集、保存等方面探讨东海陆架盆地海礁凸起油气勘探的良好前景 相似文献