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1.
Ten series of aromatic hydrocarbon compounds (biphenyl, naphthalene, phenanthrene, anthracene, retene, chrysene, benzoanthracene, dibenzofuran, fluorene, dibenzothiophene) isolated from seven Triassic and Jurassic lacustrine mudstone samples and three swamp coal samples, as well as five crude oil samples collected in the Kuche depression of the Tarim Basin,NW China, have been analysed by GC-MS techniques. It is found that the relative abundances of dibenzofuran series are higher in the three swamp coal samples than those in the lacustrine mudstone samples. Based on the similar relative abundances of dibenzofuran series, especially dibenzofuran compound, in the TICs of aromatic hydrocarbons, crude oils from wells SA3 (K), YTK5(E,K) and QL1 (E) are thought to have been derived predominantly from the coals of the Lower Jurassic Yangxia Formation or Middle Jurassic Kezilenuer Formation, whereas those from wells YM7 (O) and YHI (E) were derived mainly from Triassic and Jurassic lacustrine mudstones in the Kuche depression. This is the first report about how to distinguish coal-generated oils from lacustrine mudstone-generated oils in the Kuche depression in terms of the dibenzofuran series.The present paper has enlightening and directive significance for further oil-source rock correlations and oil and/or gas exploration in the Kuche depression of the Tarim Basin. 相似文献
2.
本文基于塔里木盆地原油中发现的８９属１８３种孢子花粉化石和１６属２７种菌藻类化石的研究，通过孢粉化石的油源对比确认中代陆相油源的重要贡献、并根据孢子花粉母体植物和藻类的生态特征讨论了油源岩形成的环境。 相似文献
3.
塔里木盆地库车坳陷中生代沉积演化 总被引：15，自引：1，他引：14
塔里木盆地库车坳陷中生代为一前陆坳陷,其内沉积了一套厚度巨大的冲积-湖泊碎屑沉积体,可识别出5种相类型、15种亚相及38种微相。坳陷呈北陡南缓的箕状,沉积体北厚南薄,沉降中心与沉积中心发生明显的错位。中生代,坳陷内湖泊经历了深陷-充填-变浅加宽的过程;三叠纪为深陷期,沉积区范围小;早、中侏罗世为充填期;晚侏罗世至白垩纪湖泊变浅加宽。气候变化总体趋势为:干旱-潮湿-干旱;早、中三叠世为干旱气候;晚三叠世至中侏罗世气候潮湿,煤系地层广泛发育;晚侏罗世至白垩纪气候转为干燥,沉积物皆呈红色 相似文献
4.
PAUL Philp 《中国地球化学学报》2012,31(3):264-275
Based on the systematic analyses of fifteen typical crude oils and ten typical potential source rocks col-lected from the Qaidam,Tarim and Turpan basins,Northwest China,the geochemical characteristics of the oils and source rocks were investigated and oil-source rock correlations undertaken.The oils and source rocks deposited in saline lacustrine environment from the western Qaidam Basin were characterized by n-alkanes with even car-bon-number preference in the C20-C28 range,low pristane/phytane(Pr/Ph) ratios(less than 0.5),and high abundances of C27 steranes,gammacerane and C35 hopanes.The oils and source rocks deposited in marine environment from the Tarim Basin were characterized by n-alkanes with even carbon-number preference in the C14-C18 range,relatively low Pr/Ph ratios(near to 1),high abundance of C28 steranes,and relatively high gammacerane.In contrast,the oils and source rocks deposited in terrigenous bog environment from the Turpan Basin were characterized by relatively high Pr/Ph ratios(oil samples greater than 6) high abundance of C29 steranes,and relatively low gammacerane and C31-35 hopanes.The higher amounts of C37 and C38 n-alkanes of source rocks from the western Qaidam Basin and the Tarim Basin suggest an origin of these alkanes from functionalized C37 and C38 n-alkadienes and alkenones in prymnesiophytes living in lacustrine and marine environments.Oil-source rock correlations suggest oils in the west-ern Qaidam Basin were derived from the Oligocene Lower Ganchaigou Formation(E3),oils in the Tabei and Tazhong uplifts from the Tarim Basin have a genetic relationship with the Middle-Upper Ordovician source beds.Oils in the Turpan Basin generally fall into two genetic types.Most oils in the Taibei depression from the Turpan Basin were derived from the Lower-Middle Jurassic coal measures,but the fewer oils in this region are a mixed source derived from the Lower-Middle Jurassic coal measure and the Upper Permian source rocks. 相似文献
5.
Gas systems in the Kuche Depression of the Tarim Basin: Source rock distributions, generation kinetics and gas accumulation history 总被引：2，自引：0，他引：2
Wenzhi Zhao Shuichang Zhang Feiyu Wang Bernhard Cramer Jianping Chen Yongge Sun Baomin Zhang Mengjun Zhao 《Organic Geochemistry》2005,36(12):1583
Six petroleum source beds have been developed in the Kuche Depression (also known as “Kuqa Depression”) of the Tarim Basin, including three lacustrine source rocks (Middle and Upper Triassic Kelamayi and Huangshanjie formations, and Middle Jurassic Qiakemake Formation) and three coal measures (Upper Triassic Taliqike Formation, Lower Jurassic Yangxia Formation, and Middle Jurassic Kezilenuer Formation). While type I–II organic matter occurs in the Middle Jurassic Qiakemake Formation (J2q), other source beds contain dominantly type III organic matter. Gas generation rates and stable carbon isotopic kinetics of methane generation from representative source rocks collected in the Kuche Depression were measured and calculated using an on-line dry and open pyrolysis system. Combined with hydrocarbon generation history modelling, the formation and evolution processes of the Jurassic–Triassic highly efficient gas kitchens were established. High sedimentation rate in the Neogene and the fast deposition of the Kuche Formation within the Pliocene (5 Ma) in particular have led to the rapid increase in Mesozoic source rock maturity, resulting in significant dry gas generation. The extremely high gas generation rates from source kitchens have apparently expedited the formation of highly efficient gas accumulations in the Kuche Depression. Because different Mesozoic source rocks occur in different structural belts, the presence of both lacustrine and coaly gas kitchens during the Cenozoic time can be identified in the Kuche Depression. As shown by the chemical and stable carbon isotope compositions of the discovered gases, the formation of the giant gas pools in the Kela 2, Dina 2, Yaha and Wucan 1 have involved very different geological processes due to the difference in their gas source kitchens. 相似文献
6.
吐哈盆地原油和烃源岩单烃碳同位素组成特征及油源对比探讨 总被引：5，自引：0，他引：5
本文测定了吐哈盆地原油和部分烃源岩的单烃碳同位素组成，利用单烃碳同位素组成及其分布模式和样品生物标志物的分布和组合特征研究沉积环境和母质输入特征，进行原油成因类型划分和油源对比探索。吐哈盆地原油可划分为三类:一类是典型沼泽相-湖沼相煤成油，如台北凹陷各油田侏罗系原油；二类是湖相原油，如托参１井三叠系原油；三类是浅湖相原油，如胜金口油田中侏罗统原油。油源对比认为目前吐哈盆地侏罗系产出的原油由中下侏罗统煤系地层有机质生成，而托克逊凹陷三叠系原油由上二叠统湖相泥岩生成。 相似文献
7.
根据沉积充填与沉积演化分析,昌都盆地中生代为一个叠合型盆地,晚三叠世为一个陆内断陷盆地,经历了断陷期-坳陷期-萎缩期,侏罗纪为一个受东、西两侧造山带挤压而形成的山间坳陷盆地。喜山期,昌都盆地经历了强烈的改造。昌都盆地存在3套烃源岩,即阿堵拉组和夺盖拉组潟湖相泥岩和沼泽相含煤岩系、中侏罗统东大桥组深湖相泥岩和灰岩; 4套储集岩,即甲丕拉组河流相碎屑岩、阿都拉和夺盖拉组滨岸相和三角洲相碎屑岩、波里拉组颗粒灰岩和白云岩。有利油气构造均形成于侏罗纪末,与三叠系的生油阶段基本吻合,可形成较好的油气成藏,其中昌都-察雅香堆为最有利油气远景区。 相似文献
8.
综合运用露头、测井、岩芯等资料,对塔里木盆地北部库车坳陷库车河野外露头及塔北隆起区三叠系层序结构特征进行了分析。各层序低位体系域,主要是冲积扇、辫状河、辫状河三角洲等粗粒沉积体,层序上部多为湖相泥岩,统称为湖侵-高位体系域,单个层序均具有“下粗上细”的“二元”结构特征。塔北三叠系特殊的层序结构,主要是与三叠纪塔里木盆地的幕式挤压活动有关。挤压初期,物源近且供给充分,可容空间增加缓慢,主要为低位体系域的粗碎屑沉积;随着挤压作用持续增强,湖盆逐渐加深,细粒沉积物为主体的湖侵体系域沉积;最终盆地基底破裂时,湖平面快速下降,高位体系域不甚发育,多为湖相细粒沉积物。据此提出塔北三叠系层序发育模式,认为在构造挤压期,沉积扇三角洲、辫状河三角洲等粗粒低位域沉积;而在构造持续期和卸载期,层序上部发育细粒深湖-半深湖湖侵-高位体系域沉积。由于层序特殊的“二元结构”特征,纵向上构成了较好的生储盖组合。因此,除了构造油气藏外,塔北地区各层序低位体系域的岩性油气藏及岩性-构造油气藏是重要的勘探目标。 相似文献
9.
Based on quantitative GC-MS analysis of 40 crude oil samples collected from the south area of western Qaidam Basin,one of the largest saline lacustrine basins in China,the geochemical characteristics of aromatic hydrocarbons in oils were studied systematically in this paper.Among those constitutes,naphthalene(43% 59%),phenanthrene(12% 21%) and taromatic-sterane series(6% 28%) were the main ones of aromatic hydrocarbons.The ratio of aromatic hydrocarbon maturity parameter vs.saturated hydrocarbon maturity parameter C 29 20S/(20S+20R) shows that some aromatic hydrocarbon maturity parameters are not suitable for low-mature oils,including MPI,MNR,DNR,etc.Meanwhile,maturity parameters for dibenzothiophene and taromatic-sterane series are more appropriate for low maturity saline lacustrine crude oils.Based on the ratio of 4,6-DMDBT/1,4-DMDBT,the R c values are within the range of 0.59% 0.72%.However,the abundance of dibenzothiophene(DBT) is low,and the dibenzofuran(DBF) content is even lower,suggesting that the crude oils were formed in a saline lacustrine anaerobic environment.The high abundance of C 26 triaromatic steroid also indicates that the source material is brackish water-saline water with strong reducibility. 相似文献
10.
二连盆地侏罗系烃源岩研究程度较低,但在侏罗系发现有工业油流.本文通过有机岩石学与有机地球化学常规分析,系统研究与评价了此套烃源岩;结合原油与烃源岩的生物标志化合物的对比与分析,探讨其对油源的贡献.结果表明,二连盆地上侏罗统烃源岩有机质丰度低,有机质类型以Ⅲ型为主,成熟度较低,为非或差烃源岩;中下侏罗统有机质丰度较高,有机质类型以Ⅱ2-Ⅲ型为主,成熟度较高,为较好—好烃源岩.侏罗系烃源岩形成于淡水的氧化沉积环境,以陆源高等植物输入为主.此外,阿56井阿尔善组部分原油和图参1井侏罗系原油来源于侏罗系烃源岩.由此推断二连盆地侏罗系烃源岩具有良好的生烃潜力,勘探前景广阔. 相似文献
11.
A typical case of coal-derived oils in China, i.e. the crude oils from the Middle-Lower Jurassic coal measure strata in the Turpan Basin, is presented. By means of oil-source correlation, it is confirmed that low maturity crude oil in the Shengjinkou oil field is derived from the coal-bearing Qiketai Formation of Middle Jurassic age, a brackish lacustrine sediment. Mature crude oils in the Qiketai oil field, and in well Taican 1, are sourced from the Badaowan Formation of Lower Jurassic age, which contains coal seams as thick as 100 m. Results show that commercial accumulations of liquid crude oils can be generated from coals and coal measure strata containing high volatile coal of bituminous rank. Despite unfavourable types of source material, the total hydrocarbon-generating potential can be great due to the unusual abundance of organic matter. 相似文献
12.
通过色谱-质谱分析,对海拉尔盆地贝尔凹陷35个原油样品进行聚类分析,将之分成4类.Ⅰ类原油是贝尔凹陷原油主体,占分析样品的77%,特点足菲系列含量高,平均值为64.7%,三芳甾类化合物和三芴类化合物含量次之,分别为11.42%和11.81%.Ⅱ类原油为高三芳甾类原油,三芳甾类化合物占芳烃化合物的53.9%,是该类原油的主要成份,非系列化合物含量较低,为32.5%,萘系列含量和三芴化合物含量最低,分别为0.6%和3.54%.Ⅲ类原油为高菲系列和高萤蒽含量原油,菲系列为64%,萤蒽含量高达11%,是其它原油的16倍以上.Ⅳ类原油具有高萘、高三芴化合物和低菲系列化合物的特点,分别占原油芳烃馏分的30%、32%和26%,三芳甾类化合物含量低,占3.6%.这充分说明海拉尔箍地烃源岩沉积期间有不同的沉积环境,原油有不同的牛烃母质.Ⅱ类原油以藻类为主要生烃母质,Ⅲ类原油以高等植物为主,Ⅰ类原油介于Ⅱ类和Ⅲ类原油之间,为混合型生烃母质.Ⅳ原油沉积环境和前三类原油明显不同,为咸水强还原湖相沉积环境. 相似文献
13.
The geochemical characteristics of crude oils and reservoir core extracts from the Kuche petroleum system are described and studied systematically by means of various geochemical techniques and methods to acquire molecular information. The results suggest crude oils from the petroleum system can be divided into two groups: marine oils and non-marine oils. The former represents the dominant oils found in the area. Tar mats were firstly discovered and determined accurately in terrestrial oil and gas reservoirs, with Lower Tertiary sandstone reservoirs in the Yaha oilfield of the Tarim Basin. However, based on the ratio of 20S/(20S 20R)C29 sterane as a maturity parameter, lacustrine oils filled into the Tertiary reservoirs in the direction toward the western part of the petroleum system. In contrast, according to the fact that methylcyclohexane indices of eastern oils are greater than those of western oils, the location in which coalgenerated oils filled into the Tertiary reservoirs lies in the eastern part of the petroleum system. 相似文献
14.
Well Zheng-1 is located in the combined area of the central uplift and the north Tianshan piedmont depression in the Junggar Basin. Two oil-bearing beds are recognized at 4788–4797 m of the Lower Cretaceous Tugulu Formation (K1tg) and 4808.5–4812.5 m of the Lower Jurassic Sangonghe Formation (J1s). The geochemical characteristics of family composition, carbon isotopic composition, saturated hydrocarbons, sterane and terpane biomarkers and carotane of two crude oils are described in this paper. The results show that the geochemical characteristics of the two crude oils are basically similar to each other, indicating they were all derived mainly from the high mature, brine, algae-rich lake facies sediments. Oil-source correlation revealed that crude oils of the two beds were derived mainly from the source rocks of Permian and mixed by the oil derived from the source rocks of Jurassic and Triassic. This is consistent with the geological background with several sets of source rocks in the area studied. 相似文献
15.
渤海湾盆地海域断陷湖盆歧口凹陷古近系烃源岩及原油样品中,检测出丰富的四环聚异戊二烯类化合物。四环聚异戊二烯类化合物（C30TPP）具有两个异构体,能有效地区分渤海湾盆地海域歧口凹陷沙三段（Es3）烃源岩和沙一段（Es1）烃源岩形成的混源原油,是湖相原油的油源对比研究中的新分子化石。四环聚异戊二烯类化合物与水体盐度之间有密切关系,沉积环境水体盐度越高,其丰度越高。随热演化程度增大,原油的四环聚异戊二烯类化合物（TPP）丰度逐渐降低。四环聚异戊二烯类化合物（TPP）具有湖相有机质输入的很强专属性,可用于判识湖相原油研究,在研究湖相沉积环境有机质的油源对比、沉积环境及热演化规律中具有重要地质-地球化学意义。 相似文献
16.
塔里木盆地北部三叠纪孢粉植物群及层序地层的划分 总被引：1，自引：0，他引：1
依据对塔里木盆地北部库车河剖面及沙１１井和沙３２井三叠纪地层和孢粉学的研究，将本区三叠纪孢粉划分为８个孢粉组合。其中，早三叠世２个组合，中三叠世３个组合，晚三叠世３个组合。三叠纪地层除产有丰富的孢子花粉外，在不同层位还有不同丰度和分异度的疑源类、轮藻、介形虫及植物化石等。依据不同层位中各类生物的不同丰度，建立了１１个生物埋藏群落，它们反映了不同的生态和埋藏环境。按照这些生物埋藏群落在剖面纵向上的演变，将塔里木盆地北部三叠纪地层划分为９个三级地层层序，恢复了三叠纪塔里木盆地北部古湖盆湖平面的升降历史 相似文献
17.
以准噶尔盆地南缘韭菜园子沟剖面中二叠统芦草沟组野外露头为研究对象,结合该地区芦草沟组沉积时期坳陷湖盆的沉积特征和大套灰黑色油页岩的发育背景,对芦草沟组上部砂体进行了观察描述和沉积分析。在露头剖面上,芦草沟组以灰黑色油页岩为主,但笔者首次在该组上部发现了厚约60m的砂岩,其与上覆红雁池组灰黑色油页岩呈整合接触,具有明显的深水沉积背景。通过对该套砂体的岩石类型划分与沉积现象解析,共识别出2大类10种砂泥岩类型,明确了牵引流和浊流共同发育的特征。该套砂体中可识别出深水扇的3种沉积亚相和相应沉积微相,由3期富砂型湖泊深水扇叠置形成。结合此次露头观察与特征描述,分析了研究区由厚层砂岩到泥砂岩互层的演化过程,并建立了芦草沟组富砂型湖泊深水扇沉积模式。这个典型露头的沉积解剖,是对准噶尔盆地南缘芦草沟组深水沉积体系研究的有益补充。 相似文献
18.
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
19.
民和盆地侏罗系地层划分与对比 总被引：2，自引：0，他引：2
民和盆地是一个油、煤、气伴生的中新生代陆相盆地,侏罗系地层层序自下而上划分为下侏罗统炭洞沟组(大西沟组)、中侏罗统窑街组、红沟组、上侏罗统享堂组。中侏罗世早、中期气候温暖湿润,形成了以沼泽相煤系地层和湖相暗色泥岩、油页岩为主的生油建造,晚侏罗世至白垩纪气候较为干燥,形成了以河流相为主的砂砾岩储集建造。根据古生物、岩性、电性、含煤性、构造、古气候等地层划分对比标志,重新确立了盆地的地层系统,建立了盆地中新生界地层标准剖面,为盆地石油勘探奠定了坚实的基础。 相似文献
20.
为进一步加强珠三坳陷的勘探研究,应用色质、同位素、轻烃等地球化学分析方法,重新取样分析了珠三坳陷37个原油样品和40个岩石样品,根据新分析的资料对珠三坳陷烃源岩和油源再次进行综合对比研究,取得了新的认识。研究结果表明:珠三坳陷文昌B凹陷主力烃源岩是文昌组中深湖相烃源岩,而不是文昌组滨浅湖相烃源岩,文昌A凹陷主力烃源岩则是湖沼相的恩平组烃源岩;文昌B凹陷的WC19-1和WC19-2构造原油的主要贡献者是文昌组中深湖相烃源岩;文昌A凹陷的WC9-1、WC9-2、WC9-3、WC14-3、WC11-2构造原油主要贡献者是恩平组烃源岩;琼海凸起西区(WC13-1、WC13-2、QH18-1、QH23-1构造)原油主要源自文昌B凹陷文昌组中深湖相烃源岩;琼海凸起东区(WC19-6N、WC7-2、WC7-3、WC8-3构造)原油则主要源于文昌A凹陷恩平组烃源岩;珠三坳陷主要经历了两期油气充填。 相似文献