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1.
The Changling gas field is occurs in tight sandstone reservoirs of the Lower Cretaceous Denglouku Formation in the Changling fault depression , southern Songliao Basin , China, which constitutes a new gas-pro-ducing area in the depression .Using information on the source-reservoir-cap rock assemblage of the Denglouku Formation, fault activity, and single well burial history of well CS 1, together with data on reservoir fluid inclu-sion and laser Raman spectroscopy , we described the formation of the Changling gas field and determine that this fault depression did not possess suitable conditions for hydrocarbon generation .Coal-derived methane gen-erated from underlying hydrocarbon source rock accumulated in the Lower Cretaceous Yingcheng Formation .At the end of the Late Cretaceous Qingshankou Stage , underwater volcanic eruptions occurred in the northern part of the Changling gas field near Qian'an, resulting in the reactivation of deep faults .Mantle-sourced inorganic CO2 migrated along faults to hydrocarbon gas reservoirs in volcanic rocks of the Yingcheng Formation ;Mean-while, displaced methane ( hydrocarbon gas ) migrated upward to sand reservoirs of the Denglouku Formation . The methane accumulated and formed secondary gas reservoirs ,Therefore fault activity was the main factor con-trolling the generation of gas reservoirs in the Denglouku Formation .The main accumulation period of the Yingcheng hydrocarbon gas reservoirs was 82 Ma.Whereas gas reservoir formation in the overlying Denglongku Formation was 79 Ma, slightly later than the time of formation of the Yingcheng gas reservoir in CS 1 well area. At 79 Ma, the burial depth of the Denglouku Formation was 1800-2000 m, the diagenesis is relatively weak and the physical properties of the reservoir are relatively favorable for accumulation .This period is not only at gas generation peak time of three sets of source rock but also at the reactivation of deep faults during the forma -tion of fault-bound depressions , thereby providing favorable conditions for the migration and accumulation of methane . 相似文献
2.
琼东南盆地的中生代凹陷群是扩大油气勘探发现的远景区。为了实现琼东南盆地中生界的勘探突破,急需落实中生代凹陷的油气成藏条件和有利勘探领域。基于地球物理、地球化学、钻井资料及古生物资料,首次对琼东南盆地中生代凹陷开展了深入系统的分析研究。研究表明,在琼东南盆地北部崖北凹陷、崖城凸起、崖南低凸起和西南部陵南低凸起及南部隆起均存在中生代沉积地层。根据盆地构造演化分析,中生代沉积形成于燕山期太平洋板块向欧亚板块俯冲期以及其后的弧后伸展期,存在烃源岩、储层及圈闭等油气地质基本条件。琼东南盆地北部坳陷带崖城-崖北地区相比盆地其他地区中生代沉积凹陷规模大,因此本研究重点对琼东南盆地北部坳陷带崖城-崖北地区进行了系统的油气地质综合分析研究,落实了崖城-崖北地区中生界沉积地层分布,并初步评价预测了有利油气勘探区带及重点目标。研究表明,琼东南盆地崖城-崖北地区中生代凹陷发育湖相烃源岩、三角洲等储集体以及构造与地层圈闭,存在西洼南坡带和中部隆起带2个有利油气勘探区带。在这些区带加大勘探,有望获得中生界油气突破。 相似文献
3.
Sedimentary basins in the Yellow Sea can be grouped tectonically into the North Yellow Sea Basin (NYSB), the northern basin of the South Yellow Sea (SYSNB) and the southern basin of the South Yellow Sea (SYSSB). The NYSB is connected to Anju Basin to the east. The SYSSB extends to Subei Basin to the west. The acoustic basement of basins in the North Yellow Sea and South Yellow Sea is disparate, having different stratigraphic evolution and oil accumulation features, even though they have been under the same stress regime since the Late Triassic. The acoustic basement of the NYSB features China-Korea Platform crystalline rocks, whereas those in the SYSNB and SYSSB are of the Paleozoic Yangtze Platform sedimentary layers or metamorphic rocks. Since the Late Mesozoic terrestrial strata in the eastern of the NYSB (West Korea Bay Basin) were discovered having industrial hydrocarbon accumulation, the oil potential in the Mesozoic strata in the west depression of the basin could be promising, although the petroleum exploration in the South Yellow Sea has made no break-through yet. New deep reflection data and several drilling wells have indicated the source rock of the Mesozoic in the basins of South Yellow Sea, and the Paleozoic platform marine facies in the SYSSB and Central Rise could be the other hosts of oil or natural gas. The Mesozoic hydrocarbon could be found in the Mesozoic of the foredeep basin in the SYSNB that bears potential hydrocarbon in thick Cretaceous strata, and so does the SYSSB where the same petroleum system exists to that of oil-bearing Subei Basin. 相似文献
4.
西湖凹陷中央反转带中北部大型气田成藏因素及动态匹配关系至今不明。通过针对烃源岩、储层、输导体系及成藏期等成藏关键因素进行系统分析,建立"源-储-圈-输"的动态成藏过程分析中央反转带中北部大气田的成藏主控因素。研究表明始新统宝石组与平湖组煤系烃源岩不仅生气强度大,而且中新世晚期以来的快速生、排气为中央反转带中北部的大中型天然气藏提供了充足油气源;花港组小于4 000 m地层的酸性地层水是形成有利储层的关键;中新世晚期发生的龙井运动强烈挤压作用使中央反转带发生了构造变形和断层开启活动,为圈闭和油气输导通道的形成创造了条件。综合"源-储-圈-输"分析认为成藏主控因素在生烃期的有机耦合造就了始新统煤系烃源岩高效生气及天然气的有效运移聚集成藏的全过程。本次研究为研究区大气田的勘探提供了借鉴。 相似文献
5.
Methane-rich fluids were recognized to be hosted in the reservoir volcanic rocks as primary inclusions.Samples were collected from core-drillings of volcanic gas reservoirs with reversed δ12C of alkane in the Xujiaweizi depression of the Songliao Basin. The volcanic rocks are rhyolite dominant being enriched in the more incompatible elements like Cs, Rb, Ba, Th, U and Th with relative high LREE, depleted HREE and negative anomalies of Ti and Nb,suggesting a melt involving both in mantle source and crustal assimilation. Primary fluids hosted in the volcanic rocks should have the same provenance with the magma. The authors concluded that the enclosed CH4 in the volcanics are mantle/magma-derived alkane and the reversed δ13C of alkane in the corresponding gas reservoirs is partly resulted from mixture between biogenic and abiogenic gases. 相似文献
6.
蒙甘青地区白垩纪原型盆地分布特征及盆山格局 总被引：4，自引：0，他引：4
通过野外地质调查并结合前人资料,对蒙甘青地区白垩纪原型盆地沉积特征及盆山格局进行了研究。结果表明,白垩纪时期,因受北侧西伯利亚板块、东侧太平洋板块和西南印度板块共同影响,研究区由晚侏罗世的挤压和抬升作用进入松弛拉张裂陷阶段,早白垩世盆地沉降中心较侏罗纪向北迁移,发育了以坳陷和断陷为主的8个大小不一的沉积盆地群。晚白垩世本区受西南部印度板块与青藏高原碰撞对接的强烈影响,沉积盆地逐渐消失,此时沉积中心转移到祁连山东部及阿拉善一带,主要发育了2个沉积盆地群。早白垩世为本区烃源岩形成时期,研究该区白垩纪盆山构造发育及原型盆地沉积特征对寻找以白垩系为烃源岩的油气藏具有重要意义。 相似文献
7.
Wangjiatun gas pool is located at the north part of Xujiaweizi in Songliao basin. Commercial gas flow has been found in the intermediate and acid volcanic rock of upper Jurassic - lower Cretaceous, which makes a breakthrough in deep nature gas prospecting in Songliao basin. The deep natural gas entrapment regularity is discussed in the paper by the study of deep strata, structure and reservoir. Andesite, rhyolite and little pyroclastic rock are the main reservoirs. There are two types of volcanic reservoir space assemblage in this area: the pore and fissure and the pure fissure. Changes had taken place for volcanic reservoir space during long geologic time, which was controlled by tectonic movement and geologic environment.The developed degree of reservoir space was controlled by tectonic movement, weathering and filtering, corrosion and Filling. There are three types of source- reservoir-caprock assemblage in this area: lower source- upper reservoir model,upper source - lower reservoir model and lateral change model. Mudstone in Dengluoku formation and the compacted volcanic rock of upper Jurassic - lower Cretaceous are the caprock for deep gas reservoirs. Dark mudstone of deep lacustrine facies in Shahezi formation and lower part of Dengluoku formation are the source rock of deep gas. It can be concluded that deep gas pools are mainly volcanic lithologic reservoirs. 相似文献
8.
SHAN Xuanlong 《东北亚地学研究》2001,(2)
1 ＩｎｔｒｏｄｕｃｔｉｏｎＷａｎｇｊｉａｔｕｎｇａｓｐｏｏｌｉｓｌｏｃａｔｅｄａｔｔｈｅｎｏｒｔｈｐａｒｔｏｆＸｕｊｉａｗｅｉｚｉｉｎＳｏｎｇｌｉａｏｂａｓｉｎ(Ｆｉｇ .1 ) .Ｄｒｉｌｌｉｎｇｓｔａｒｔｅｄｉｎ 1 995 .Ｃｏｍｍｅｒｃｉａｌｇａｓｆｌｏｗｈａ 相似文献
9.
In the northern Songliao Basin, volcanics are fre-quently found and related closely to tectonic activi-ties during Early Cretaceous. The lava is mainly erupted along deep faults and distributed along the margine of the faulted depression. In deep part of Xujiaweizi area, natural gas exploration has been very successful, such as in the well Wang 9-12, well Shengshen 101 and well Fangshen 9 which are all highly-yield gas wells. Anda fault depression is lo-cated in the north of Xujia… 相似文献
10.
珠江口盆地多个凹陷均有钻井钻遇CO2气体, 个别井钻遇的CO2体积分数高达90%以上, 这些CO2气体直接驱替了早期油藏或影响了油气充注规模, 增加了勘探风险。运用钻井数据、地球化学分析数据、重磁研究结果, 通过分析CO2分布特征, 总结CO2分布与断裂、火成岩的关系, 明确CO2分布的主控因素, 预测珠江口盆地高CO2风险带的分布。研究表明: 珠江口盆地对油气成藏有影响的CO2主要为无机幔源成因, 受区域盖层和储层的控制, CO2主要分布在上渐新统到下中新统地层及以下地层, 向上CO2逐渐减少, 同时无机幔源CO2分布明显受控于断裂体系, 与基底断裂和火成岩体具有较好的对应关系。无机CO2气源主要为幔源岩浆的脱气作用, 垂向运移主要受不同级别断裂控制, 尤其该区深大断裂和基底长期活动断裂起到了很大作用, 因此幔源岩浆活动与断裂体系是CO2汇聚的主控因素。由于珠江口盆地不同凹陷结构差异的影响, 幔源CO2运聚成藏机制可概括为两类: 一是在北部坳陷带, 地壳厚度大, CO2沿着深大断裂逐级向中上地壳运移形成"中转站", 然后在基底断裂的沟通下向浅层运移成藏; 二是在珠二坳陷, 由于地壳减薄作用, 并且发育拆离体系, 幔源岩浆首先到达拆离面, 脱出的CO2沿着拆离面运移, 当遇到深切至拆离面的断裂后继续向浅层运移成藏。基于以上分析并结合运聚条件预测出珠江口盆地分布着7个高CO2风险带, 这7个高CO2风险带均位于深大断裂带附近, 并且周边火成岩较为发育。 相似文献
11.
孤店断陷为松辽盆地南部深层天然气勘探的有利区带,同时也记录了中国东部中-新生代板块运动和盆地演化的丰富信息。利用钻测井资料及高分辨率三维地震资料,并结合区域构造背景,对孤店断陷的地质结构及构造演化特征进行分析。结果表明孤店断陷在纵向上可以划分为基底构造层、下构造层、中构造层及上构造层。由于受到晚中生代以来太平洋板块向东亚板块的俯冲作用及区域构造应力场的影响,孤店断陷的构造演化过程可以划分为断陷期、断坳转换期、稳定坳陷期及构造反转期。孤店断陷的边界大断层(孤店断层)在断陷初始发育期(火石岭组-沙河子沉积期)表现为6段走向各不相同的小型孤立断层,在断陷晚期(营城组沉积期)经过生长、连接而形成统一的断陷边界,并在断坳转换期(登娄库组-泉头组沉积期)和坳陷期(青山口组-嫩江组沉积期)发生广泛而强烈的张扭活动,以及在构造反转期(嫩江组沉积末期)发生强烈反转和分段差异逆冲活动。研究结果可以为松辽盆地以及中国东部地区的构造活动及演化研究提供参考,并进一步指导油气勘探。 相似文献
12.
A series of volcanic rocks were developed in the deep part of Anda faulting depression. The reflection of therocks are mainly stratiform and hummocky. Three kinds of volcanic facies, e.g. explosion facies, effusion facies andsub-volcanic facies,were recognized by different reflecting characteristics in the seismic profile. The volcanic rocks areformed during three episodes of volcanic activities from Shahezi Formation to Yingcheng Formation. The volcanismshave relation to the formation of Songliao Basin and regional tectonics of northeastern China. Some of the volcanic rocksare good oil and gas reservoirs. 相似文献
13.
14.
Evolution of Hydrodynamic Field, Oil-Gas Migration and Accumulation in Songliao Basin, China 总被引：2，自引：0，他引：2
The oil-gas migration and accumulation in the Songliao Basin were analyzed in the view of fluid dynamics by the authors. The key point of fluid dynamics is hydrodynamics. Oil-gas migration and accumulation are related closely with formation and evolution of hydrodynamic field. Based on abundant data, initial formation pressure and other parameters, such as water head were studied. They can be used to understand the present distribution of hydrodynamic field and its hydrochemical features. Generally, the hydrodynamic field in the basin is obviously asymmetrical. In its north and east part, there are the areas of centripetal flow caused by topographic relief when meteoric water permeate downwards. Its south part is an evaporation-concentration area. The central depression is an area of centrifugal flow driven by sediment compaction and its cross-formational flow area. Only at the basin margin and in the local uplifted and denudated area are the meteoric water permeating downwards areas. The centrifugal flow driven by sediment compaction is the main dynamic factor that induces oil-gas migration and accumulation and its formation period corresponding to the main stage of oil-gas migration and accumulation. Moreover, the evolution of hydrodynamic field has the cyclic property, which results in phased oil-gas migration by stages, and further dominates the terraced annular oil and gas distribution, concentric with their corresponding sags. 相似文献
15.
缅甸安达曼海弧后坳陷天然气成藏要素及成藏模式 总被引：1，自引：0，他引：1
缅甸安达曼海已成为中国石油企业的重要海外探区之一。受印度板块向欧亚板块和西缅甸微地块多期斜向俯冲的影响,该区先后经历了被动陆缘、过渡型陆缘及主动陆缘的演化阶段,盆地属性与油气成藏特征极为复杂。通过系统梳理安达曼海弧后坳陷的烃源岩、储盖层、圈闭、输导体系与油气生-运-聚匹配史等成藏要素,总结出该区油气成藏主控因素。结果表明:本区发育渐新统—下中新统、中中新统与上新统3套泥质烃源岩,前二者为成熟烃源岩,后者为生物气源岩;岛弧带上碳酸盐岩礁体与斜坡带上砂体的储集条件良好;斜坡带继承性古隆起之上的断背斜圈闭容积大;高角度张性断裂与连通性砂体分别构成以垂向、侧向为主的输导体系。结合油气成因、运移方式与圈闭类型的主要特征,建立了2种成藏模式:①中央凹陷带浅层生物气或混源气垂向运移断块圈闭成藏模式;②东部斜坡带、西部斜坡和岛弧带热解气侧向运移断背斜-岩性圈闭成藏模式。西部斜坡及岛弧带上的碳酸盐岩礁体和东部斜坡带继承性古隆起之上的大型断背斜是有利勘探目标。 相似文献
16.
川西坳陷深盆气研究进展与问题讨论 总被引：3，自引：2，他引：1
川西坳陷总体上看具有与加拿大阿尔伯达盆地类似的地质条件，极可能发育深盆气藏。详细研究表明，两盆地在构造回返程度、地层压力特征、气源岩生气时代等方面存在较大差异，不宜将川西坳陷的天然气聚集简单地归结为阿尔伯达型深盆气藏。研究其成因和分布规律，应从该盆地的实际资料入手，进行成藏机理研究，而不能简单地借用已有的模式进行对比。研究认为，川西坳陷的天然气藏具有“气水倒置”的特征；川西坳陷的断裂体系深刻地影响着深盆气聚集成藏，导致盆地天然气的独特分布形式。对深盆气成藏诸控制因素，包括源岩厚度、有机质成熟度、生气强度、储集层厚度与物性、断裂构造特征等的综合研究，对川西坳陷深盆气藏的分布进行了预测。 相似文献
17.
Yong Yuan Jianwen Chen Yuxi Zhang Jie Liang Yinguo Zhang Penghui Zhang 《中国海洋大学学报(英文版)》2018,17(5):1075-1090
The South Yellow Sea Basin is the main body of the lower Yangtze area in which marine Mesozoic–Paleozoic strata are widely distributed.The latest geophysical data were used to overcome the limitation of previous poor-quality deep data.Meanwhile,the geological characteristics of hydrocarbon reservoirs in the marine Mesozoic–Paleozoic strata in the South Yellow Sea Basin were analyzed by comparing the source rocks and the reservoir and utilizing drilling and outcrop data.It is believed that the South Yellow Sea Basin roughly underwent six evolutionary stages:plate spreading,plate convergence,stable platform development,foreland basin development,faulted basin development,and depression basin development.The South Yellow Sea Basin has characteristics of a composite platform-fault depression geological structure,with a half-graben geological structure and with a ‘sandwich structure' in the vertical direction.Four sets of hydrocarbon source rocks developed – the upper Permian Longtan–Dalong formation,the lower Permian Qixia formation,the lower Silurian Gaojiabian formation,and the lower Cambrian Hetang formation/Mufushan formation,giving the South Yellow Sea Basin relatively good hydrocarbon potential.The carbonate is the main reservoir rock type in the South Yellow Sea area,and there are four carbonate reservoir types:porous dolomitic,reef-bank,weathered crust,and fractured.There are reservoir-forming horizons similar to the typical hydrocarbon reservoirs in the Yangtze land area developed in the South Yellow Sea,and there are three sets of complete source-reservoir-cap rock assemblages developed in the marine strata,with very good hydrocarbon potential. 相似文献
18.
Cai Laixing Xiao Guolin Zeng Zhigang Zhang Xunhua Guo Xingwei Wang Shuping 《中国海洋湖沼学报》2020,38(4):1169-1187
The South Yellow Sea Basin(SYSB) has multiple sets of proven source rocks and good hydrocarbon prospects,but no industrial oil and gas has been explored at present.To solve this puzzle for petroleum geologists,we systematically investigated the marine hydrocarbon geological conditions based on cores and testing data from borehole CSDP-2,the first exploration well with continuous coring in SYSB.The qualities of source rocks are evaluated in detail according to organic matter abundance,type,and maturity.The reservoir characterization mainly includes porosity,permeability,and reservoir space.Displacement pressure test and stratum thickness are the main foundations for defining the caprocks.Then,the oil-source rock correlation in the Permian and stratum model are analyzed to determine the favorable source-reservoir-caprock assemblages.The results show that three sets of effective source rocks(the Lower Triassic,Upper Permian,and Lower Permian),two sets of tight sandstone re servoirs(the Upper Permian and Lower Silurian-Upper Devonian),and two sets of caprocks(the Lower Triassic and Carboniferous) combine to constitute the hydrocarbon reservoir-forming as se mblages of "lower-ge neration and upper-accumlation" and "self-generation and self-accumlation",thus laying a solid foundation for promising petroleum prospects.The three sets of marine source rocks are characterized by successive generation and expulsion stages,which guarantees multistage hydrocarbon accumulation.Another three sets of continental source rocks distributed across the Middle Jurassic,Upper Cretaceous,and Paleogene depression areas,especially in the Northern Depression,may supplement some hydrocarbons for the Central Uplift through faults and the Indosinian unconformity.The favorable Permian exploration strata have been identified in the Central Uplift of SYSB.First,the Lower Permian and Upper Permian source rocks with high organic matter abundance and high thermal maturity supply sufficient hydrocarbons.Secondly,the interbedding relationship between the source rocks and sandstones in the Upper Permian strata ensures that hydrocarbons have been migrated into the nearby Upper Permian sandstones,reflecting near-source hydrocarbon accumulation.Finally,the good sealing property of the Lower Triassic Qinglong Formation caprocks plays an indispensable role in hydrocarbon preservation of the Permian reservoirs.This conclusion is supported by direct oil shows,gas logging anomalous layers,and hydrocarbon-bearing fluid inclusions. 相似文献
19.
川西坳陷须家河组致密气藏已成为拓展油气勘探、发现新储量的重要领域,致密气藏发育特征及其成藏机理成为目前亟需解决的关键科学问题之一。运用地球化学、地球物理和沉积学等分析方法,对须三段源储特征及成藏模式进行了系统分析,对高效烃源岩和优质储层进行了判别和预测,厘定了致密气藏成藏期次和成藏模式。得出以下结论:①须三段发育成熟-高成熟湖相烃源岩,以Ⅲ型干酪根为主,局部偶见Ⅱ2型干酪根。发育于须三下亚段最大湖泛面附近,泥页岩体积分数在65%以上或者单层厚度较大、且1.50% ≤ w（TOC）≤ 10%时,属于高效烃源岩。②基于砂岩粒度中值识别出4期（S1,S2,S3和S4）优质储层,都属于低孔低渗-特低孔特低渗致密储层,中砂-细砂,粒度分布范围为0.5~0.062 5 mm,厚度一般5~10 m。主要发育于三角洲前缘和前三角洲。③烃源岩生排烃时间持续较长,中侏罗世开始生烃,一直持续至晚白垩世;从晚侏罗世开始排烃,早白垩世达到高峰。优质储层经历早期天然气持续充注和晚期凝析气充注,天然气充注时间要早于凝析气充注时间。形成了"断层垂向输导,先聚集后致密,晚期改造调整"的致密气藏成藏模式。 相似文献
20.
According to well logs, core, seismic and other geological data, the authors studied the tectonic evolution stages, trap formation stages, fault and fracture development in the Bashituo area, and furthermore, analyzed the time of hydrocarbon accumulation, hydrocarbon migration pathways and related controversial issues in the study area. It is believed that the tectonic evolution in the study area can be divided into three stages, namely Late Hercynian, the Early Himalayan and the Late Himalayan. In the Late Hercynian, tectonic movement led to folding and faulting, resulting in the embryonic form of anticlinal traps. In the Early Himalayan, affected by both tectonic movement and transformation, deep faults reactivated and cut through the Lower Tertiary strata. After the Early Himalayan tectonic movement, faulting stopped and no vertical migration pathway was available. Then hydrocarbon migrated laterally along the sand bodies in the Bachu Formation and accumulated in the Carboniferous reservoirs. However, the Carboniferous accumulation was formed late, and the tectonic movement was weak at the Late Himalayan, and faults were underdeveloped, so the reservoirs in the deep Bachu Formation were not disturbed. 相似文献