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渤海湾盆地A油田是与火成岩相关的大型油田，目的层碎屑岩储层与火成岩交织分布。为明确研究区火成岩的发育特征及其成因机理，综合应用岩芯、井壁取芯、测录井及三维地震等资料，通过岩矿分析、薄片观察、地震相分析等手段对火成岩类型、发育模式、分布范围以及火成岩对储层物性的影响进行研究。结果表明：(1)研究区发育爆发相、火山通道相、溢流相、次火山岩相和火山沉积相5种火山岩相，以中心式和裂隙式2种喷发模式为主；(2)受断层根部低洼区溢流相及火山通道周边侵入相影响，研究区断裂系统复杂带、火山通道发育区储层物性变差。基于上述认识，利用火山岩体精细识别追踪结果，将火山岩体嵌套进地质模型中，实现了火成岩的形态建模。该研究成果较好指导了油田开发井的实施，规避了储层风险。为油田下一步综合调整及高效开发提供指导作用。 相似文献
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以岩屑、壁心、薄片分析、测井等资料为基础,利用不同火山岩测井响应差异,建立了B油田火山岩岩性识别模板,指导单井火山岩定量识别,并揭示区域火山岩空间展布规律。根据区内火山岩发育类型、岩石组合类型和火山机构地震响应特征,明确该区发育6种火山岩相,包括火山通道相、溢流相、爆发相、侵出相、次火山岩相和火山沉积相,建立区域基性火山岩岩相模式,并明确该区发育以B1井区为代表的中心式和以B8井区为代表的裂隙—中心式2种喷发模式。上述模式的建立,指导了该区后续火山岩精细刻画和储层风险评价,为该区的储量评价和前期方案研究做出了重要的贡献。 相似文献
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东海平湖油气田中高渗凝析气藏开发效果分析 总被引：1，自引：0，他引：1
东海平湖油气田放鹤亭始新统平湖组气藏,属中高渗砂岩中低凝析油含量凝析气藏,1999年3月投入生产,采用衰竭式开采,至今已有8个年头,目前仍处于开发稳产阶段,日生产天然气量在140×10^4m^3左右。通过对平湖油气田凝析气藏开发生产状况跟踪研究发现,其采气速度高、主力气藏气井无水采气期普遍较长、气油比随着压力下降而上升、凝析油含量随着压力下降而下降、天然气采收率将优于开发方案设计值,同时也发现,防止气井出水、出砂是中高渗凝析气藏开发中应予以高度重视的问题。平湖油气田凝析气藏开发,在技术上和经济上都取得了较好的效果,可以借鉴于类似凝析气田的开发实践中。 相似文献
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陆相断陷盆地的沉积可容空间变化规律控制着盆地的层序地层充填样式和生储盖发育规律,根据目前我国陆相断陷盆地的层序地层响应特征,将沉积可容空间的变化频率分为低频和高频两种类型。油气汇聚体系是陆相断陷盆地油气勘探的研究对象,根据油气聚集规模将其划分为大型、中型和小型等三种规模类型。具备不同层序地层充填样式的陆相断陷盆地一般发育不同规模类型的油气汇聚体系和相应的空间展布规律：低频率沉积可容空间变化的陆相断陷盆地可以发育大型、中型规模的油气汇聚体系;高频率沉积可容空间变化的陆相断陷盆地一般发育中型或者小型规模的油气汇聚体系,大型规模的油气汇聚体系欠发育。我国陆区陆相断陷盆地中的东营凹陷是低频率沉积可容空间变化的典型代表,东濮凹陷是高频率沉积可容变化的典型代表;海区陆相断陷盆地中的涠西南凹陷属于低频率可容空间变化的类型,海中凹陷属于较高频率可容空间变化的类型。 相似文献
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盐城凹陷天然气成藏条件分析 总被引：4，自引：0，他引：4
盐城天然气属于高成熟源岩的裂解产物，主要来自古生界海相高成熟腐泥型源岩，朱家墩气藏主要的产气层系为阜宁组，泰州组碎屑岩储层，其中阜一段砂岩以Ⅱ类储层为主，Ⅰ类储层为次；泰州组以Ⅲ类储层为主，Ⅱ类储层为次，阜二段，阜一段中上部泥岩，泥灰岩，泰二段的泥岩和浦口组中上部含膏泥岩，在全区分布稳定，是良好的区域性盖层。盐城朱家墩地区主要分3个成藏层段，一是以阜宁组一段底部砂岩为主的构造气藏；二是以泰州组的较致密砂岩和玄武岩为主的岩性气藏；三是以中，古生界为主的气藏，盐城凹陷朱家墩天然气藏在具有良好盖层的储层段聚集成藏。朱家墩气藏成藏时期较晚，但与古生界二次生烃高峰时期一致，气源相对充足，而且储盖组合较好，但分布受控于深大断裂的发育以及储层的储集物性。 相似文献
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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
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以东海某凹陷二维地震、三维地震及钻测井等资料为基础,开展控凹断层活动定量分析,并且探讨了断陷期重要不整合面特征及其对沉积演化的控制作用。研究表明,东海某凹陷断陷沉积时期,断裂活动从剧烈到平静,地形高差从大到小,形成了3个重要不整合面:断陷幕次界面T40和T34,断陷―断坳转换面T32。由此,将断陷期划分为3期断陷幕和1期断坳幕:断陷Ⅰ幕(古新统)为构造启动期,其受控于三潭断裂和白堤断裂,分布范围局限,发育近源沉积体系;断陷Ⅱ幕(始新统宝石组)和断陷Ⅲ幕(始新统平湖组下段)为强烈断陷期,地层被断层错断严重,水深较大,西部缓坡带以受潮汐影响的三角洲、潮坪沉积为主,东部陡坡带以扇三角洲沉积为主,受断陷格局限制,扇三角洲以快速沉积、堆积厚度大、沉积范围小、相变快为主要特征;断坳幕(始新统平湖组中上段)为断陷萎缩期,地层开始向坳陷沉积转换,盆地与南部海域沟通变强且水深变浅,凹陷内部以平行岸线的潮流作用为主,发育大规模的非对称性三角洲和陆架潮汐砂脊等,储层富集,可作为有利勘探目标。此外,断陷幕发育扇三角洲等近源沉积,是岩性油气藏的有利发育区,也为深层油气勘探提供了方向。 相似文献
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关于元谋盆地的沉积特征与地层划分 总被引：3，自引：0，他引：3
元谋盆地在断陷过程中连续地堆积有厚度约800m的地层.据沉积相分析,在岩石地层上可以划分为三个段:约100m厚的坡洪积和湖沼相的沙沟组;603m厚的元谋组;104m厚的洪积相上那蚌组.按磁性地层测量及沉积物厚度估算,其平均沉积速率为41cm/ka.该盆地经历了上升和侵蚀,并发育了数级冲积、洪积扇的阶地沉积. 相似文献
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方正断陷三维区沉积演化特征 总被引：2，自引：0，他引：2
应用层序地层学分层基础下的沉积学原理,依据各种数据,进行了各级层序单元的识别与划分,在本区识别出扇三角洲相、湖泊相和湖底扇相3类沉积相,进一步划分为8种沉积亚相和16种沉积微相;通过地震相研究及砂体的预测,进行了各层段微相的平面展布特征研究。结果表明研究区主要发育由方正断陷边缘和依汉通断裂向方正断陷中心推进的扇三角洲—湖泊沉积体系。 相似文献
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We discuss the reservoir formation mechanisms in volcanic gas reservoirs within a volcanostratigraphic framework, with a focus on the Huoshiling Formation of the Wangfu fault depression in the Songliao Basin, China. The volcanic sequences are divided, from large to small, into the volcanic cycle (VC), cooling unit set (CUS) and cooling unit (CU). The CU is the basic volcanogenic stratigraphic unit and the CUS is a superposition of cooling units which may be recognized on seismic profiles.The Huoshiling Formation consists of two volcanic cycles and one volcanic-sedimentary cycle. The formation mechanisms of volcanic reservoirs include three processes based on the strata's evolution. First, CUs formed and primary pore spaces developed near cooling surfaces. Second, CUSs and VCs formed and parasyngenetic and secondary pore spaces developed around the crater or caldera, especially near the weathering surface. Lastly, numerous dissolved pores and structural fractures formed during burial and concentrated near the fault belt. CUs, volcanic edifices and structural systems controlled the formation of volcanic reservoirs. The overlapping crater-proximal crater region and the faulted area were centres of reservoir formation. In the Huoshiling Formation, CUS 6-CUS 8 and CUS 13 are the major horizons where volcanic reservoirs developed, forming dissolution reservoirs and structurally fractured reservoirs for natural gas accumulation. 相似文献
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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
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Cong Chen Xiangtao Zhang Guangrong Peng Zulie Long Baojun Liu Xudong Wang Puqiang Zhai Bo Zhang 《海洋学报(英文版)》2023,42(3):189-200
The eastern main sub-sag (E-MSS) of the Baiyun Sag was the main zone for gas exploration in the deep-water area of the Zhujiang River (Pearl River) Mouth Basin at its early exploration stage, but the main goal of searching gas in this area was broken through by the successful exploration of the W3-2 and H34B volatile oil reservoirs, which provides a new insight for exploration of the Paleogene oil reservoirs in the E-MSS. Nevertheless, it is not clear on the distribution of “gas accumulated in the upper layer, oil accumulated in the lower layer” (Gasupper-Oillower) under the high heat flow, different source-rock beds, multi-stages of oil and gas charge, and multi-fluid phases, and not yet a definite understanding of the genetic relationship and formation mechanism among volatile oil, light oil and condensate gas reservoirs, and the migration and sequential charge model of oil and gas. These puzzles directly lead to the lack of a clear direction for oil exploration and drilling zone in this area. In this work, the PVT fluid phase, the origin of crude oil and condensate, the secondary alteration of oil and gas reservoirs, the evolution sequence of oil and gas formation, the phase state of oil and gas migration, and the configuration of fault activity were analyzed, which established the migration and accumulation model of Gasupper-Oillower co-controlled by source and heat, and fractionation controlled by facies in the E-MSS. Meanwhile, the fractionation evolution model among common black reservoirs, volatile reservoirs, condensate reservoirs and gas reservoirs is discussed, which proposed that the distribution pattern of Gasupper-Oillower in the E-MSS is controlled by the generation attribute of oil and gas from source rocks, the difference of thermal evolution, and the fractionation controlled by phases after mixing the oil and gas. Overall, we suggest that residual oil reservoirs should be found in the lower strata of the discovered gas reservoirs in the oil-source fault and diapir-developed areas, while volatile oil reservoirs should be found in the deeper strata near the sag with no oil-source fault area. 相似文献
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探讨川西坳陷中段沙溪庙组天然气成藏地质条件,为油气勘探提供理论依据。从油气的烃源条件、储集条件、保存条件及成藏组合方面入手,结合构造史以及岩心、地震及钻井等资料进行分析,结果表明川西坳陷中段处于生烃坳陷中心地带,烃源岩丰富,具备生烃能力。晚三叠世中、晚期发育冲积扇—河流沉积相带,储集条件良好,后期构造运动使断层裂缝系统较发育,有利于储集条件改善和油气富集。其上有压力封存箱和巨厚的砂泥岩互层,保存条件良好。川西坳陷中段新场—盐亭地区近EW向古隆起及龙门山前缘扩展变形带中的鸭子河—石板滩地区是油气勘探的有利地带。 相似文献
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南黄海盆地北部坳陷北凹是一个大中型的中、新生代沉积凹陷,经过四十余年的油气勘探,至今仍无商业油气发现,仅发现诸城1-2一个含油气构造.北凹的油气勘探存在诸多问题,其中是否发育优质烃源岩、烃源岩能否生烃、油气是否运移至储层是关系到北凹油气勘探的基础地质问题.在对北凹主要烃源岩分析评价的基础上,采用流体包裹体系统分析技术,对北凹油气成藏特征展开研究.研究认为,北凹存在白垩系泰二段主力烃源岩,为中深湖相,生烃指标较好,分布面积较大,且现今已经成熟并排烃,生烃中心位于ZC-A井区.油气通过断裂发生垂向运移,已充注至始新统戴南组储层.流体包裹体荧光观察结果及显微测温结果均表明戴南组至少存在两期油充注,第一期发生在35 Ma左右,第二期为现今. 相似文献
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Shuo Chen Renhai Pu Huiqiong Li Hongjun Qu Tianyu Ji Siyu Su Yunwen Guan Hui Zhang 《海洋学报(英文版)》2022,41(9):86-106
The Dongfang1-1 gas field (DF1-1) in the Yinggehai Basin is currently the largest offshore self-developed gas field in China and is rich in oil and gas resources. The second member of the Pliocene Yinggehai Formation (YGHF) is the main gas-producing formation and is composed of various sedimentary types; however, a clear understanding of the sedimentary types and development patterns is lacking. Here, typical lithofacies, logging facies and seismic facies types and characteristics of the YGHF are identified based on high-precision 3D seismic data combined with drilling, logging, analysis and testing data. Based on 3D seismic interpretation and attribute analysis, the origin of high-amplitude reflections is clarified, and the main types and evolution characteristics of sedimentary facies are identified. Taking gas formation upper II (IIU) as an example, the plane distribution of the delta front and bottom current channel is determined; finally, a comprehensive sedimentary model of the YGHF second member is established. This second member is a shallowly buried “bright spot” gas reservoir with weak compaction. The velocity of sandstone is slightly lower than that of mudstone, and the reflection has medium amplitude when there is no gas. The velocity of sandstone decreases considerably after gas accumulation, resulting in an increase in the wave impedance difference and high-amplitude (bright spot) reflection between sandstone and mudstone; the range of high amplitudes is consistent with that of gas-bearing traps. The distribution of gas reservoirs is obviously controlled by dome-shaped diapir structural traps, and diapir faults are channels through which natural gas from underlying Miocene source rocks can enter traps. The study area is a delta front deposit developed on a shallow sea shelf. The lithologies of the reservoir are mainly composed of very fine sand and coarse silt, and a variety of sedimentary structural types reflect a shallow sea delta environment; upward thickening funnel type, strong toothed bell type and toothed funnel type logging facies are developed. In total, 4 stages of delta front sand bodies (corresponding to progradational reflection seismic facies) derived from the Red River and Blue River in Vietnam have developed in the second member of the YGHF; these sand bodies are dated to 1.5 Ma and correspond to four gas formations. During sedimentation, many bottom current channels (corresponding to channel fill seismic facies) formed, which interacted with the superposed progradational reflections. When the provenance supply was strong in the northwest, the area was dominated by a large set of delta front deposits. In the period of relative sea level rise, surface bottom currents parallel to the coastline were dominant, and undercutting erosion was obvious, forming multistage superimposed erosion troughs. Three large bottom current channels that developed in the late sedimentary period of gas formation IIU are the most typical. 相似文献
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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
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2015~2016年在神狐新钻探区钻遇大量水合物岩心,证实南海北部神狐新钻探区具有较好的水合物成藏环境和勘探前景。结合2008~2009年该区采集的地震资料,我们对晚中新世以来细粒峡谷的沉积特征及其相应的水合物成藏模式进行了分析。通过对大量地震剖面进行解释,发现该区峡谷两侧的隆起上发育大量的滑塌体。本文通过岩心粒度分析,地震相识别分析和水合物测井响应分析等手段综合识别出对水合物成藏有控制作用的三种类型的滑塌体：原生滑塌体、峡谷切割滑塌体、和同生断裂滑塌体。结合沉积速率、流体流速分析和峡谷迁移等沉积学要素对滑塌体成因进行分析,认为峡谷切割滑塌体由于后期峡谷迁移对前期滑塌体切割形成的、同生断裂滑塌体是由于隆起区基底不平引起差异性沉降而形成的。不同类型的滑塌体发育位置不同：原生滑塌体常发育在隆起中坡度较缓的区域、峡谷切割成因滑塌体常发育在不定向迁移的峡谷两侧、同生断裂滑塌体常发育在隆起中坡度起伏较大的区域。三种类型滑塌及其相应的水合物成藏模式不同,其中原生滑塌体有利于水合物成藏,而另外两种类型的滑塌体由于其不能对自由气进行有效封堵而不利于水合物成藏。根据三种滑塌体对水合物成藏的响应指出在粗粒的含有孔虫粉砂岩储层上,覆盖细粒的泥岩对自由气进行封堵有利于水合物成藏,并且多层的泥岩覆盖是造成水合物稳定带中水合物多个分层成矿现象出现的原因。 相似文献