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准噶尔盆地西部车排子凸起新近系沙湾组成藏体系与富集规律 总被引：6，自引：1，他引：5
准噶尔盆地西部车排子凸起远源成藏,新近系油气藏和油气显示基本都在一套厚砂层和其上的薄砂层中,厚砂层和薄砂层之间存在密切的油源联系。针对这一成藏现象,利用区域构造、油源对比、输导体系、化验证据、成藏特征等手段,系统研究车排子的成藏体系。结果表明,车排子轻质油源岩为侏罗系,主要来自昌吉凹陷西部,油气运移指向为东南到西北方向。区域构造运动形成的白垩系与侏罗系的不整合面和红车断裂的长期活动使得油气能从深部生烃区向浅层凸起区长距离运移。沙湾组一段区域展布的厚砂层高效的横向输导作用是车排子凸起油气规模富集的关键,喜马拉雅期小断层的纵向沟通促成了沙湾组二段薄砂岩性体的最终成藏。白垩系与侏罗系的不整合面-红车断裂-沙湾组一段厚砂层的紧密接触、良好匹配构成了复式、高效的输导格架。通过成藏体系研究,归纳总结了车排子地区的成藏模式,并提出沙湾组二段岩性油气藏和一段上倾尖灭或超覆油气藏是最有利的勘探方向。 相似文献
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中生界侏罗系是鄂尔多斯盆地重要的石油勘探与开发目的层之一,侏罗系油藏受前侏罗纪古地貌影响较为显著。本文通过流体包裹体特征分析、均一化温度测定和包裹体丰度（GOI）分析、定量颗粒荧光（QGF、QGF-E）研究以及储集层自生伊利石K-Ar定年等实验方法和手段的应用,对鄂尔多斯盆地侏罗系油气包裹体特征进行了精细描述及定量化分析研究,揭示了侏罗系油藏形成时间、充注过程及油气包裹体与油气运移、成藏的关系。研究结果表明：侏罗系油藏存在晚期充注,早期充注少或油藏遭受调整,早期生成的烃类现今仅以沥青的形式赋存,现今烃类流体主要为晚期成藏的产物。侏罗系石油大规模充注期为（108.3±2.0）~（116.5±2.0）Ma（早白垩世中期）,具有垂向运移聚集的特点。鄂尔多斯盆地侏罗系油藏早期受岩性和构造双重控制,晚期构造活动调整了油气藏的形态及局部富集。侏罗系在晚期成藏过程中没有形成过叠合连片的大规模的油藏,只在局部构造上形成规模较小的“小而肥”的独立油藏。 相似文献
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为了准确认识油气藏形成和分布规律, 在运用泥岩声波时差法和地层趋势外推法确定古近纪末期剥蚀量的前提下, 综合生烃史、流体包裹体均一温度、热史、埋藏史、原油性质、储层温压特征等因素探讨了辽西低凸起和辽中凹陷的油气成藏期次.研究表明剥蚀量整体处于150~450 m范围; 辽西低凸起和辽中凹陷区的油气均为晚期成藏, 均是12 Ma以来甚至更晚才有油气充注; 不同在于辽西低凸起上的沙河街组油气为两期充注, 后一期充注为主, 潜山的油气充注晚于沙河街组; 而辽中凹陷的油气为一期充注. 相似文献
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准噶尔盆地车排子地区侏罗系与白垩系地层水矿化度整体较低,以Na HCO3水型为主。根据地层水化学成分特征,计算出多种离子比例系数,分析其与油气聚集的关系。研究表明:离子比例系数有明显的南北分区特征,南部凸起边缘封闭性不好,北部古隆起位于构造高部位,封闭条件较好,南部邻区四棵树凹陷的油气经南部断裂等输导体系运移到北部成藏。侏罗系地层水曾经遭受过比较强烈的大气降水的入渗,使早期油发生水洗氧化作用,形成现今大量的稠油油藏。侏罗系地层水封闭性好于白垩系,更有利于油气聚集和保存。 相似文献
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库车前陆盆地羊塔克地区油气资源丰富,明确油气充注历史和成藏演化过程对下一步油气勘探具有重要意义.利用流体包裹体岩相学观察、显微测温分析、定量颗粒荧光分析,并结合库车前陆盆地烃源岩热演化史以及构造演化史,分析了库车前陆盆地羊塔克地区的油气成藏过程.结果表明,羊塔克地区油气具有“晚期成藏,后期改造”的特征.库车坳陷中侏罗统恰克马克组烃源岩在15 Ma左右成熟(Ro＞0.5%),生成的成熟原油最早是在新近纪库车早期,约4.0 Ma时期,充注到羊塔克构造带,形成少量黄色荧光油包裹体,但大量充注是在约3.5 Ma时期.库车坳陷中下侏罗统煤系源岩是在约26 Ma时达到成熟,生成的天然气在约3.5 Ma,开始大规模的向羊塔克构造带充注.天然气充注后对早期少量原油进行气洗,形成发蓝色荧光的、气液比不一的油气包裹体.油气充注后,在羊塔1地区形成残余油气藏,油水界面位于5 390.75 m处.新近纪库车晚期(3.0~1.8 Ma),受喜山晚期构造运动影响,羊塔克地区油气藏发生调整改造,羊塔1地区白垩系的残余油气水界面向上迁移至现今的5 379.70 m处. 相似文献
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库车坳陷东部油气地质条件复杂,天然气成因与油气充注时间存在争议,油气充注史不明,制约其油气勘探进程。利用天然气组分、碳同位素组成、流体包裹体岩相学与均一温度等分析测试数据,结合沉积埋藏史及构造演化史,研究了库车坳陷东部吐格尔明地区天然气地球化学特征、天然气成因类型及油气充注时间,分析了油气充注成藏过程。结果表明:吐格尔明地区天然气组分以甲烷为主,甲烷含量为75.56%~90.11%,干燥系数为0.79~0.93;δ13C1和δ13C2值为-35.73‰~-33.80‰和-26.41‰~-25.30‰,天然气成因类型属于成熟阶段的煤成气。吐格尔明地区侏罗系砂岩储层发育两类流体包裹体,分别为黄色液态烃包裹体和蓝白色荧光的气液烃包裹体、灰色的气烃包裹体,表明该区存在两期油气充注,第一期为13~7 Ma的原油充注,第二期为2.6 Ma以来的天然气充注。康村组早中期,吐格尔明地区烃源岩形成的原油充注至宽缓背斜圈闭中保存;库车组晚期,侏罗系克孜勒努尔组与阳霞组发育良好的源储组合,天然气近距离充注成藏。 相似文献
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利用显微荧光与包裹体显微测温技术,并结合烃源岩生排烃史分析,探讨了鄂尔多斯盆地陇东地区延长组含油气流体活动期次及石油充注历史。结果表明：陇东地区延长组烃源岩开始排烃的时期为早白垩世早期（约133 Ma）,主要存在两期含油气流体活动,第一期含油气流体活动发生在早白垩世主力源岩排烃期间（133~100 Ma）,第二期含油气流体活动发生在晚白垩世构造抬升期间（100~70 Ma）。早白垩世期间石油的充注表现为充注强弱程度不同的连续过程,晚白垩世以来生烃停止导致石油的充注与运移逐渐减弱并在晚白垩世末期基本停止。 相似文献
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新疆准噶尔盆地侏罗系—白垩系生物地层和同位素年龄研究的新进展 总被引：4，自引：1，他引：3
研究的侏罗系—白垩系包括侏罗系头屯河组、齐古组、喀拉扎组和白垩系清水河组。清水河组的叶肢介、介形虫和孢粉化石组合研究的新成果表明:其地质时代为早白垩世早期(Berriasian)。齐古组下部的同位素年龄为164.6Ma±1.4Ma。此年龄值与国际地质年表对比,几乎与Callovian的底界年龄(164.7Ma±4.0Ma)相当。依据此年龄值和沉积厚度、沉积速率推算,齐古组的主要时代应为中侏罗世卡洛期(Callovian),其下部跨入巴通期最晚期;喀拉扎组的时代可能为牛津期最早期(early Early Oxfor-dian)。上列事实反映出在侏罗系与白垩系之间几乎缺失全部晚侏罗世的沉积,由此可以推断本区在晚侏罗世曾发生过一次较强烈的构造运动。 相似文献
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准噶尔盆地西北缘南部红车断裂带- 车排子凸起油气藏众多,原油物理化学性质和地球化学特征十分复杂,原油类型及其来源长期存在很大争议。本文在准噶尔盆地不同时代烃源岩生成原油典型地球化学特征与主要油源判识指标归纳总结的基础上,对红车断裂带- 车排子凸起原油地球化学特征和来源进行系统分析研究,将该区域原油分为五类,其中三类原油分别来源于二叠系湖相烃源岩、中—下侏罗统煤系烃源岩、古近系安集海河组湖相烃源岩,另外两类为混合原油,分别为来源于二叠系湖相烃源岩的生物降解稠油与中—下侏罗统煤系烃源岩生成的正常原油和古近系湖相烃源岩生成的正常原油的混合原油。红车断裂带石炭系—白垩系油藏原油主要来源于沙湾凹陷二叠系湖相烃源岩,车排子凸起东北部春风油田稠油来源于沙湾凹陷二叠系湖相烃源岩;车排子凸起东侧- 红车断裂带西侧新近系沙湾组油藏轻质原油来源于四棵树凹陷古近系湖相烃源岩;车排子凸起中部春光油田白垩系—古近系油藏稠油为二叠系来源稠油和侏罗系正常原油的混合原油,新近系沙湾组油藏稠油为二叠系来源稠油与新近系正常原油的混合原油;车排子凸起西部石炭系—古近系油藏轻质原油来源于四棵树凹陷中—下侏罗统煤系烃源岩,而新近系沙湾组油藏轻质原油来源于四棵树凹陷古近系湖相烃源岩。本文对准噶尔盆地西北缘南部地区油气藏成藏研究及区域油气勘探决策具有重要参考作用。 相似文献
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Zhihuan Zhang Liming Qin Wei Li Chunjiang Wang Nansheng Qiu Xianlong Meng Zhenying Zhang Dongshan Yuan 《中国地球化学学报》2010,29(2):121-129
Geochemical composition characteristics of light oils from the Tertiary in the west of the Chepaizi uplift in the Junggar basin, northwest China, are distinct from those of biodegraded oils derived from the Permian in the study area and crude oils from some adjacent oil fields such as the Chepaizi and Xiaoguai oilfields. Oil source correlation shows that light oils in the study area have similar n-alkane and isoprenoid distribution patterns and carbon isotope compositions with the coal-derived oils from the Jurassic, and display obvious discrepancy on biomarker composition characteristics with the Cretaceous source rock extracts, inferring that they are probably the mixed oils from the Jurassic coal measures and Cretaceous source rocks. In this study, combined with the geochemical data of coal-derived oils from the Jurassic and Cretaceous source rocks or crude oils from the Cretaceous, the source and commingling features of the Tertiary crude oils of Well Pai 2 and Well Pai 8 were investigated. The proportion of the two sources in the mixed crude oils was estimated, and the hydrocarbon accumulation pattern of reservoirs in the study area was established. 相似文献
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With the aim of constraining the influence of the surrounding plates on the Late Paleozoic–Mesozoic paleogeographic and tectonic evolution of the southern North China Craton (NCC), we undertook new U–Pb and Hf isotope data for detrital zircons obtained from ten samples of upper Paleozoic to Mesozoic sediments in the Luoyang Basin and Dengfeng area. Samples of upper Paleozoic to Mesozoic strata were obtained from the Taiyuan, Xiashihezi, Shangshihezi, Shiqianfeng, Ermaying, Shangyoufangzhuang, Upper Jurassic unnamed, and Lower Cretaceous unnamed formations (from oldest to youngest). On the basis of the youngest zircon ages, combined with the age-diagnostic fossils, and volcanic interlayer, we propose that the Taiyuan Formation (youngest zircon age of 439 Ma) formed during the Late Carboniferous and Early Permian, the Xiashihezi Formation (276 Ma) during the Early Permian, the Shangshihezi (376 Ma) and Shiqianfeng (279 Ma) formations during the Middle–Late Permian, the Ermaying Group (232 Ma) and Shangyoufangzhuang Formation (230 and 210 Ma) during the Late Triassic, the Jurassic unnamed formation (154 Ma) during the Late Jurassic, and the Cretaceous unnamed formation (158 Ma) during the Early Cretaceous. These results, together with previously published data, indicate that: (1) Upper Carboniferous–Lower Permian sandstones were sourced from the Northern Qinling Orogen (NQO); (2) Lower Permian sandstones were formed mainly from material derived from the Yinshan–Yanshan Orogenic Belt (YYOB) on the northern margin of the NCC with only minor material from the NQO; (3) Middle–Upper Permian sandstones were derived primarily from the NQO, with only a small contribution from the YYOB; (4) Upper Triassic sandstones were sourced mainly from the YYOB and contain only minor amounts of material from the NQO; (5) Upper Jurassic sandstones were derived from material sourced from the NQO; and (6) Lower Cretaceous conglomerate was formed mainly from recycled earlier detritus.The provenance shift in the Upper Carboniferous–Mesozoic sediments within the study area indicates that the YYOB was strongly uplifted twice, first in relation to subduction of the Paleo-Asian Ocean Plate beneath the northern margin of the NCC during the Early Permian, and subsequently in relation to collision between the southern Mongolian Plate and the northern margin of the NCC during the Late Triassic. The three episodes of tectonic uplift of the NQO were probably related to collision between the North and South Qinling terranes, northward subduction of the Mianlue Ocean Plate, and collision between the Yangtze Craton and the southern margin of the NCC during the Late Carboniferous–Early Permian, Middle–Late Permian, and Late Jurassic, respectively. The southern margin of the central NCC was rapidly uplifted and eroded during the Early Cretaceous. 相似文献
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准噶尔盆地车排子隆起西南部原油地球化学特征及油源分析 总被引：6，自引：3，他引：3
车排子隆起毗邻昌吉凹陷和四棵树凹陷,油源丰富,构造条件良好,具备比较有利的油气聚集条件。近年来已在车排子隆起的侏罗系、白垩系、古近系和新近系获高产工业油气流。分析了车排子隆起西南部原油（或油砂抽提物）的地球化学特征,并对其油源作初步分析。结果表明研究区具有两类地球化学性质存在明显差别的原油。第一类原油遭受了不同程度的生物降解,并存在二次充注现象,推测早期充注原油来自昌吉凹陷二叠系,并遭受了不同程度的生物降解,后期混入了来自侏罗系烃源岩生成的原油。第二类原油具有侏罗系煤系烃源岩与白垩系湖相泥质烃源岩混源的特点,这类原油的碳同位素组成、正构烷烃分布特征和姥植比等均表现出煤成油的特征,但甾、萜烷烃类化合物组成与白垩系烃源岩接近,推测是由于侏罗系煤成油在向上运移成藏过程中,受到成熟度相对较低、生物标志物相对丰富的白垩系烃源岩的浸析作用所致。 相似文献
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Geochronology of oil-gas accumulation （OGA） is a challenging subject of petroleum geology in multi-cycle superimposed basins.By K-Ar dating of authigenic illite （AI） and fluid inclusion （FI） analysis combined with apatite fission track （AFT） thermal modeling,a case study of constraining the OGA times of the Permian reservoirs in northeast Ordos basin （NOB） has been conducted in this paper.AI dating of the Permian oil-gas-bearing sandstone core-samples shows a wide time domain of 178-108 Ma.The distribution of the AI ages presents 2-stage primary OGA processes in the Permian reservoirs,which developed in the time domains of 175-155 Ma and 145-115 Ma with 2-peak ages of 165 Ma and 130 Ma,respectively.The FI temperature peaks of the samples and their projected ages on the AFT thermal path not only present two groups with a low and a high peak temperatures in ranges of 90-78℃ and 125-118℃,respectively corresponding to 2-stage primary OGA processes of 162-153 Ma and 140-128 Ma in the Permian reservoirs,but also appear a medium temperature group with the peak of 98℃ in agreement with a secondary OGA process of c.～30 Ma in the Upper Permian reservoirs.The integrated analysis of the AI and FI ages and the tectono-thermal evolution reveals that the Permian reservoirs in the NOB experienced at least 2-stage primary OGA processes of 165-153 Ma and 140-128 Ma in agreement with the subsidence thermal process of the Mid-Early Jurassic and the tectono-thermal event of the Early Cretaceous.Then,the Upper Permian reservoirs further experienced at least 1-stage secondary OGA process of c.～30 Ma in coincidence with a critical tectonic conversion between the slow and the rapid uplift processes from the Late Cretaceous to Neogene. 相似文献
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对大兴安岭中南段内蒙古科尔沁右翼前旗哈拉黑地区原定二叠系林西组和侏罗系白音高老组的样品分别进行了锆石LA-ICP-MS U-Pb同位素测年,获得林西组的282 Ma和317 Ma两组峰值年龄以及白音高老组134 Ma、242 Ma和284 Ma的3组峰值年龄,说明原定白音高老组地层并非属于侏罗纪,而应该属于白垩纪。根据锆石结构特点推测林西组地层物源可能主要来自该区晚泥盆世-早石炭世岩浆弧产物和下二叠统大石寨组火山沉积。综合区域资料研究认为,内蒙古东部大兴安岭地区可能曾经发育有三叠纪沉积,现今大面积的缺失是由于后期构造抬升剥蚀所致。 相似文献
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LIU Luofu KUANG Jun WANG Ping CHEN Zhijun WANG Weibin ZHAO Yande WU Lin JIN Jun WANG Weili MENG Jianghui ZHOU Jieli LIU Guodong 《《地质学报》英文版》2010,84(5):1209-1219
<正>So far there has been no common opinion on oil source of the Chepaizi swell in the Junggar Basin.Therefore,it is difficult to determine the pathway system and trend of hydrocarbon migration, and this resulted in difficulties in study of oil-gas accumulation patterns.In this paper,study of nitrogen compounds distribution in oils from Chepaizi was carried out in order to classify source rocks of oils stored in different reservoirs in the study area.Then,migration characteristics of oils from the same source were investigated by using nitrogen compounds parameters.The results of nitrogen compounds in a group of oil/oil sand samples from the same source indicate that the oils trapped in the Chepaizi swell experienced an obvious vertical migration.With increasing migration distance,amounts and indices of carbazoles have a regular changing pattern(in a fine linear relationship).By using nitrogen compounds techniques,the analyzed oil/oil sand samples of Chepaizi can be classified into two groups.One is the samples stored in reservoir beds of the Cretaceous and Tertiary,and these oils came from mainly Jurassic source rock with a small amount of Cretaceous rock;the other is those stored in the Jurassic,Permian and Carboniferous beds,and they originated from the Permian source.In addition,a sample of oil from an upper Jurassic reservoir(Well Ka 6), which was generated from Jurassic coal source rock,has a totally different nitrogen compound distribution from those of the above-mentioned two groups of samples,which were generated from mudstone sources.Because of influence from fractionation of oil migration,amounts and ratios of nitrogen compounds with different structures and polarities change regularly with increasing migrating distance,and as a result the samples with the same source follow a good linear relationship in content and ratio,while the oil samples of different sources have obviously different nitrogen compound distribution owing to different organic matter types of their source rocks.These conclusions of oil source study are identical with those obtained by other geochemical bio-markers. Therefore,nitrogen compounds are of great significance in oil type classification and oil/source correlation. 相似文献