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1.
Terrestrial faulted lacustrine basin is considered as a favorable place for the development of source rocks,especially the fault basins in eastern China.Based on molecular composition study of saturated and aromatic hydrocarbons in the extracts of source rocks of the Yingcheng and Shahezi formations in the Lishu Fault Depression,it is revealed that the extracts of source rocks are provided with low ratio of Pr/Ph,low content of C24 tetracyclic terpanes,high content of tricyclic terpanes and gammacerane,relatively high content of C27 steranes in the sag belt and its periphery;relatively high ratio of Pr/Ph,relatively high content of tetracyclic terpanes and gammacerane,low content of C27 steranes and obvious advantages of C29 steranes in its gentle slope belt;with high ratio of Pr/Ph,high content of C19,C20 tricyclic and C24 tetracyclic terpanes,very low content of gammacerane and C27 steranes,and high content of C29 steranes in the edge of fault depression.According to the organic matter input and sedimentary environment,three types of source rocks have been established,which,respectively,are the mode of mixing organic matter input in deep and semi-deep lake,the advantage of terrigenous input in shallow lake and terrigenous input in shore-shallow lacustrine.The first mode is supposed to generate oil and gas,while the second one tends to generate oil.The distribution characteristics of oil and gas in the Lishu Fault Depression are very likely to be controlled by hydrocarbon generating characteristic of different source rock types. 相似文献
2.
藏北羌塘盆地晚侏罗世海相油页岩生物标志物特征、沉积环境分析及意义 总被引：6，自引：1，他引：5
胜利河油页岩位于青藏高原腹地的羌塘盆地,具单层厚度薄、区域延伸长的特点,为羌塘盆地新发现的又一处海相油页岩.采用GC-MS(IRMS)分析方法对该油页岩进行了研究,结果表明,胜利河油页岩(11层以及13层)含有丰富的正烷烃、类异戊二烯烃、萜类化合物和甾类化合物.正构烷烃呈前高后低的单峰型分布,nC15、nC16为主峰碳,轻烃组分占有绝对优势,OEP值0.96～0.97,接近平衡值1.00,Pr/Ph为0.57～0.75,显示弱的植烷优势;萜烷丰度顺序为五环三萜烷》三环萜烷》四环萜烷;规则甾烷呈不对称的"V"字型分布,表现为C27》C29》C28的分布特征.这些特征与剖面中其他岩性的生物标志物特征存在一定的差异,9层泥晶灰岩C21-/C21 值为0.86,轻烃优势并不明显;14层泥灰岩C21-/C21 值为0.41,具有明显的重碳优势;9层泥晶灰岩以及12层泥灰岩规则甾烷呈C29》C27》C28的特征也与油页岩层存在显著的差异.这些差异不仅反映了油页岩层与其他岩性间生物母源输入的差异,也反映了他们之间沉积环境的不同.胜利河地区油页岩的形成是综合因素控制的结果,古地理变化、海平面升降、生物群差异以及气候的变化均对该区油页岩的形成有一定的影响. 相似文献
3.
东营凹陷南斜坡沙四下亚段—孔店组原油地球化学特征及成因分类 总被引：2，自引：0，他引：2
东营凹陷南斜坡沙四下亚段—孔店组为一套紫红色或红色碎屑岩沉积,本身不具备生烃能力,因此对该层段原油成因的研究具有重要意义。在系统分析17个油砂和5个原油样品的生物标志物组合特征的基础上,将该区原油划分为4种成因类型。Ⅰ类原油分布于平方王地区和博兴洼陷,Pr/Ph0.8,Ph/nC180.6,伽马蜡烷含量极低,4-甲基甾烷、重排甾烷含量相对高,Ts/Tm、藿烷/甾烷值相对高,可能来源于一套淡水湖相环境下形成的、富含粘土矿物的泥岩。Ⅱ类原油分布于纯化—乐安构造带、陈官庄构造带,Pr/Ph0.6,Ph/nC182,伽马蜡烷含量高,4-甲基甾烷、重排甾烷含量低,Ts/Tm和藿烷/甾烷值低,可能与一套盐湖相泥岩或灰质泥岩有成因关系。Ⅲ类原油分布于青城北缓坡构造带,检测出25-降藿烷系列,伽马蜡烷含量介于Ⅰ类和Ⅱ类之间,可能为早期充注的Ⅱ类原油遭受生物降解后和晚期充注的Ⅰ类原油形成的混源油,且以晚期充注为主。Ⅳ类原油分布于王家岗地区孔店组,具有C29甾烷绝对优势和高含量的伽马蜡烷,推断为Ⅱ类原油和一种来源于浅湖—沼泽相的原油形成的混源油。 相似文献
4.
银额盆地查干凹陷原油地化特征及油源对比 总被引：11，自引：1，他引：11
银额盆地东部查干凹陷首次发现轻质低硫成熟原油，其饱和径含量在90％以上，成熟度相当于镜煤反射率Ro1．0％左右，是生油高峰阶段的产物；原油全碳同位素δ^13C值－31．1‰。原油生物标志物中类异戊二烯含量较高，植烷与姥皖烷均势；三环萜烷含量高于五环萜烷；含有较高的TS C29、Ts、C30重排藿烷、伽马蜡烷；藿烷中以C50藿烷为主，C32以上升藿烷含量极低；孕甾烷含量高；甾烷中以C29甾烷为主，C27甾烷含量也较高，异胆甾烷含量高于胆甾烷；重排甾烷含量低；甾烷的含量与萜烷含量相当，是典型的湖相原油。已发现的天然气中甲烷含量达80％，为湿气。原油和源岩生物标志物组成特征分析对比表明下白垩统巴音戈壁组源岩是主要油源岩。生物标志物特征示原油具有一定的运移效应。 相似文献
5.
同一洼陷不同次洼的烃源岩及生成的原油,由于古气候、古沉积环境较为相似,其常规生物标志化合物和同位素特征差别非常小,给油源分析带来困难。通过GC-MS分析提取原油和烃源岩中分子化石信息,主要依据4 甲基甾烷的相对含量和不同构型的4 甲基甾烷的分布特征来进行油源对比,为类似地区的油源分析提供了一种新思路。渤南洼陷发育Es4s和Es3x两套主力烃源岩,中部次洼、西部次洼和渤南深洼Es3x烃源岩的4 甲基甾烷/C29甾烷值分别为4.51、2.79、1.27,是由于烃源岩中沟鞭藻有机质占总有机质的比例不同所造成。不同地区原油C20、C21、C23三环萜烷和ααα20RC27、C28、C29规则甾烷等特征非常相似,成熟度相当,中、西、东三个地区原油的4 甲基甾烷/C29甾烷值分别为2.89,2.39和2.06,区别明显,各个地区4 甲基甾烷的构型也不同。对比结果表明,渤南洼陷北部陡坡带Es4s和Es3x油气均为近源成藏,主要来源于其临近次洼的Es3x烃源岩。 相似文献
6.
松辽盆地北部上白垩统油页岩属中一差油页岩;有机质类型以Ⅰ型为主,Ⅱ.型为辅,处于低成熟一成熟阶段.生物标记化合物都含有丰富的正构烷烃、类异戊二烯型烷烃、萜类化合物和甾类化合物.正构烷烃呈前高后低的单峰型分布,nC23、nC27为主峰碳,重烃组份占绝对优势,OEP值为1.02～6.63,具有明显的奇碳数优势.Pr/Ph比值为0.13～1.37,多数小于0.6,具植烷优势,伽马蜡烷含量较高,油页岩沉积环境为咸化还原环境且盐度较高.萜烷丰度顺序为五环三萜烷>三环萜烷,三环萜烷中C20、C21和C23,丰度相对较高,且C20、C21和C23多呈倒“V”形分布,C23相对富集.甾类化合物主要成份为规则甾烷C27、C28和C29,ααα20RC27、C28和C29甾烷多数呈几乎对称的“V”形分布,C29 >C28 >C27.甾萜烷分布特征反映其原始有机母质构成中既有丰富的菌藻类等低等水生生物,又有一定比例的陆生高等植物混合输入. 相似文献
7.
济阳坳陷东营凹陷的主要含油层系为古近系沙河街组。沙河街组各段沉积相的展布各具特征,演化序列清楚。沙四段早期主要发育冲积—洪积扇,分布于湖盆的边缘地区;沙四段晚期,受北断南超的箕状构造背景控制,由北向南依次发育了近岸水下扇、滑塌浊积扇、半深湖相和滨浅湖濉坝相沉积。沙三段沉积时期是三角洲发育的鼎盛时期,三角洲的主体主要分布于凹陷的东部和中部地区,伴随着三角洲自东向西的推进及湖盆范围的不断缩小,沉积类型由早期的三角洲—滑塌浊积扇、三角洲—坡移浊积扇体系向晚期的河流—三角洲体系演化。南部斜坡带以河流相沉积为主,北部陡坡带垂向上由近岸水下扇—滑塌浊积扇、三角洲和辫状河三角洲组成。经过沙三段沉积时期三角洲等的填平补齐作用,到沙二段沉积时期以河流相沉积为主,只在凹陷西部的利津洼陷发育小规模的三角洲—浅湖相沉积。沙—段沉积时期湖盆发生大规模湖侵,物源供应减弱,以滨、浅湖相沉积为主,在凹陷南部边缘发育有滩坝相沉积。 相似文献
8.
China has a number of petroliferous lacustrine sedimentary basins of varying salinity and age (mainly Eocene). A geochemical investigation has been undertaken on several oils and source rocks from the Eocene lacustrine Biyang Basin. The distributions of n-alkanes, isoprenoids, steranes, and terpanes have been studied and used to characterize the sedimentary environment of deposition, maturity, biodegradation and undertake possible correlations. The ratios of C30-hopane/gammacerane, 4-methyl-steranes/regular steranes, steranes/hopanes, C21 tricyclic/C30 hopane are proposed to be indicative of the depositional environment whereas ß-carotane appears to be a source related indicator. The geochemical data obtained in this study suggest that the major source rocks in the Biyang Basin were deposited in a saline/hypersaline depositional environment. 相似文献
9.
藏北高原双湖地区中侏罗统海相油页岩生物标志化合物分布特征及其意义 总被引：2，自引：0，他引：2
重点报道了藏北双湖地区中侏罗统海相油页岩的生物标志化合物特征，首次在该层位油页岩中检出丰富的正烷烃、类异戊二烯烷烃、萜类化合物及甾类化合物。正烷烃图谱呈单峰形，nC15、nC16或nC17为主峰碳，轻烃组份占有绝对优势，OEP值0.93～1.01，无明显的奇偶碳数优势分布；Pr/Ph值为0.77～1.59，在剖面序列中呈波动分布，显示弱植烷优势或姥鲛烷优势；藿烷以C30占优势，萜烷相对丰度五环三萜烷>三环萜烷>四环萜烷；规则甾烷∑（C27+C28）>∑C29，∑C27/∑C29值为0.79～ 1.20，在剖面序列中下部C27甾烷略占优势，上部C29甾烷略占优势，重排甾烷C27/规则甾烷C27值为0.51 ～3.63，在剖面序列中具有显著的波动性，同时检出了少量孕甾烷和4-甲基甾烷。有机质母质构成中，既有丰富的藻类等低等水生生物，可能还有一定比例陆生高等植物输入混合的特点。油页岩处于成熟阶段，整个油页岩剖面序列具有一致的热演化程度。剖面中部油页岩具有极高的原始生产力，氧化-还原条件也是控制油页岩TOC和沥青“A”含量在剖面垂向变化的重要因素。 相似文献
10.
The origin and source of the petroleum in the Jurassic reservoirs within the eastern Fukang sub-depression were geochemically investigated. They show thermal maturities matching the peak generation stage, while the condensates are at the early stage of intense cracking. Oils and condensates may have experienced mild evaporative fractionation, while mixing of severely biodegraded with non-biodegraded oils has occurred. Using biomarkers and isotopes, petroleums were classified into Group I, II and III genetic groups, with Group III further divided into IIIa and IIIb subgroups. Group I petroleum displays heavy carbon isotopes, a strong predominance of pristine over phytane, high C19 and C20 tricyclic and C24 tetracyclic terpanes, low gammacerane, and dominant C29 steranes, while Group II shows light carbon isotopes, a predominance of phytane over pristine, high C21 and C23 tricyclic with low C24 tetracyclic terpanes, high gammacerane and dominant C27 steranes. Group IIIa petroleum shows mixing compositions of Group I and II, while Group IIIb displays similar compositions to Group I, but with significantly higher Ts, C29Ts and C30 diahopane proportions. Oil-source rock correlation suggests Group I and II petroleums originate from Jurassic and Permian source rocks, respectively, while Group IIIa are mixtures sourced from these rocks and IIIb are mixtures from Jurassic and Triassic source rocks. 相似文献
11.
The present paper deals with the biomarker characteristics of crude oils and source rocks from different environments(fresh,fresh-brackish and salt waters)of nonmarine depositional basins of different ages in China.Their characters are summarized as follows:1)Souce rocks and crude oils derived from fresh-water lacustrine facies have an odd/even predominance of n-alkanes and high pristine/phytane ratios.Oils from the fresh-water lacustrine facies differ from typical marine oils in the relative contents of total steranes and terpanes,the concentrations of hopanes and organic sul-phur compounds and the values of methylphenanthrene indices and C,H,S stable isotopes.2)The source rocks and crude oils derived from saline lacustrine facies possess an even/odd predominance of n-alkanes and high phytane/pristine ratios.There are also some differences between saline lacustrine oils and freshwater lacustrine oils in the concentrations of steranes,tricyclic terpanes and organic sulphur compounds,as well as in the values of methylphenanthrene indices and C,H,S stable isotopes.3)Oils derived from fresh-brackish water lake facies differ from oils from fresh-water lacustrine or samline lacustrine environments in respect of some biomarkers.According to the various distributions of these biomarkers,a number of geochemical parameters can be applied synthetically to differentiating and identifying the nature of original depositional environments of crude oils and source rocks and that of organisms-primary source materials present in those environments. 相似文献
12.
页岩油气的勘探开发推动了泥页岩沉积机理研究的快速发展,使得细粒物质的搬运和沉积成为当今沉积学界和油气工业界共同关注的焦点。尽管海洋环境下的泥质重力流沉积研究成果频见报道,但有关我国新生代湖泊环境中的泥质重力流沉积尚未引起沉积学界的关注。故本文在国内外相关文献调研基础上,以岩芯观察和薄片鉴定为重点,分析了渤海湾盆地东营凹陷古近系沙河街组三段湖相泥质重力流沉积特征;探讨了湖相泥质重力流沉积的形成机制;以期为湖泊沉积学研究和陆相页岩油气开发提供参考。研究发现,东营凹陷古近系沙河街组三段发育泥质块体流、泥质碎屑流、泥质浊流及泥质异重流等多种重力流沉积类型;泥质滑塌岩、泥质碎屑岩、泥质浊积岩和泥质异重岩在时空上可以共生共存。认为泥质沉积物可以在动荡水体和较强水动力条件下沉淀;泥质重力流沉积在深水沉积区占有重要地位;泥质重力流对于泥页岩中的粗粒碎屑物质、有机质的搬运和沉积以及有机质的埋藏起到重要作用,因而具有重要的非常规油气地质意义。 相似文献
13.
《Applied Geochemistry》2003,18(3):445-456
Since the Shu103 well was successfully drilled in 1995, the Buried Hill reservoir is receiving a new exploration emphasis in the Liaohe Basin, China. The Buried Hill oils can be divided into 3 main types in the Shuguang-Huangxiling area based on their chemical and isotopic compositions. The first type is collected mostly from the Shuguang area. The similarity to the Es4 oils and the Es4 source rock extracts indicates that they were mainly expelled from the fourth member of the Shahejie formation (Es4) in the Chenjia Sag and/or Panshan Sag, deposited in a stratified paleolake system. The second is charactized by a relative high Pr/Ph ratio, low gammacerane content and depletion of 12C in individual n-alkanes. These characteristics represent a typical origin from dominantly freshwater paralic lacustrine sediments. Various biomarker indices of the other Buried Hill oils fall between the former two types. The authors infer that these oils may be derived from the adjacent Qingshui Sag and/or Panshan Sag, and were likely generated from transitional sedimentary facies between well-circulated freshwater paralic lacustrine and relatively closed saline lacustrine. 相似文献
14.
Crude oil samples from two basins were analyzed using comprehensive two-dimensional gas chromatography coupled to time-of-flight mass spectrometry (GC×GC–TOFMS) to better understand the compositional heterogeneity of branched-cyclic hydrocarbons. GC×GC–TOFMS and conventional GC–MS results were compared. GC×GC–TOFMS revealed a wide range of compounds, including tricyclic, tetracyclic and pentacyclic terpane series, rearranged hopanes, methyl hopanes, secohopanes, onoceranes and steranes. Assignment of methyl hopane and 8,14-secohopane series other than onocerane isomers was only possible due to the high peak capacity and sensitivity of GC×GC. The oils comprised a mixture of two end members: non-biodegraded oil with abundant tricyclic terpanes and hopanes, and severely biodegraded oil with abundant 8,14-secohopane and demethylated tricyclic terpanes. A predominance of two distinct series, 3β-methylhopane and onocerane, was detected only in the lacustrine samples (classification based on biomarker parameters). In contrast, the predominance of a 2α-methylhopane series and lack of onocerane were found only for the marine oil sample. The results suggest that the distribution of 3β- and 2α-methylhopane series and the presence or absence of onocerane isomers reflect genetic differences in the source organic matter and that these compounds are new classes of biomarkers that can used as depositional paleoenvironment proxies. 相似文献
15.
X-ray diffraction analysis of black shale of Upper Triassic Member Chang 7 of the Yanchang Formation in southeastern Ordos Basin showed that black shales were deposited in brackish, strongly reducing, semi-deep-deep lacustrine facies, and mainly composed of quartz, feldspar, carbonate （dolomite）, clay minerals （illite and il- lite/smectite） and a certain amount of pyrite. The mineral composition characteristics of this set of black shales are similar to those of highly productive shale gas in North America, for example shallow burial, low clay mineral and abundant brittle mineral, so the strata are conducive to the development of cracks and fractures. Thus, this area is favorable for shale oil/gas exploration and development. 相似文献
16.
苏北盆地高邮凹陷是江苏油田的主要油气勘探开发区，是一个南断北超的典型箕状断陷湖盆，其中的古近系戴南组为一套厚度近2 000 m的河湖相砂泥岩地层，从下到上分为一段和二段。通过沉积充填分析和沉积相编图，戴南组一段沉积时，苏北盆地断陷构造活动相对强烈，地形高差大，水体相对较深，水体范围相对较小，从南向北分别发育近岸水下扇、湖底扇、三角洲等沉积相类型。戴南组二段沉积时，构造活动有所减弱，地形高差变小，水体相对较浅，水体范围扩大至整个凹陷，从南向北分别发育扇三角洲、湖底扇、三角洲等沉积相类型。利用砂岩等厚图等资料，确定了戴南组的沉积相图。沉积相在平面上分布范围明确，纵向上既有差异性又有继承性。高邮凹陷边缘和内部的同沉积断层对沉积相和砂体的发育分布起着重要的控制作用，沉积相控制了油气分布，特别是对隐蔽油气藏形成起重要作用。高邮凹陷戴南组的隐蔽圈闭类型主要有地层超覆、断层-岩性、砂岩上倾尖灭及透镜体圈闭等。湖底扇、三角洲前缘、扇三角洲前缘、近岸水下扇中扇等为有利的储集岩相带。结合石油地质条件的分析，确定了联18-马18井区等几个有利的隐蔽油藏勘探区。 相似文献
17.
综合利用地震、测井、录井、岩心及分析化验资料,通过综合分析和系统沉积学编图,确定了黄河口凹陷古近系东营组三段（东三段）主要发育扇三角洲、辫状河三角洲、湖泊和湖底扇。东三段下部辫状河三角洲发育于黄河口凹陷的西南部和南部,在渤南凸起的南北两侧均发育扇三角洲朵体,半深湖-深湖主要分布于西部深凹部位,在B-2断隆带南部的半深湖区发育湖底扇,绝大部分地带为滨浅湖沉积,以滨浅湖泥滩和混合滩沉积为主。东三段上部辫状河三角洲发育于黄河口凹陷的西南部、南部及D-4断隆带的南侧,仅在渤南凸起的北侧发育扇三角洲朵体,半深湖-深湖主要分布于西北次凹部位,绝大部分地带为滨浅湖沉积,以滨浅湖泥滩和混合滩沉积为主。E-1-1-F-4-1井一带继承性发育滨浅湖砂质滩坝沉积。滨浅湖砂质滩坝由含砾粗砂岩、含砾中砂岩、含砾细砂岩及中、细砂岩组成,骨架颗粒成分以石英为主,发育低角度交错层理,纹层由定向排列的砾石或暗色组分显示,纹层平直,以低角度相交。滨浅湖砂质滩坝微相区为东三段优质储集层发育区。 相似文献
18.
北部湾盆地不同凹陷原油生物标志物分布与组成特征 总被引：7，自引：1，他引：7
通过对取自北部湾盆地不同凹陷典型原油样品中各类生物标志物的分布与组成特征的系统分析，发现盆地北部的涠西南凹陷和乌石凹陷所产原油具有姥植比低和奥利烷与各类重排构型生物标志物含量低，而C26+长链三环萜烷系列和C304 甲基甾烷含量高的特点，且其三环萜烷系列呈现以C23为主峰的正态分布，指示了该类原油的烃源岩沉积时水体较深，还原性相对较强，且原始生烃母质以藻类为主；而南部福山凹陷和迈陈凹陷所产的原油则具有姥植比高和奥利烷与各类重排构型生物标志物含量高的特征，而C26+长链三环萜烷系列和C304 甲基甾烷含量低，且其三环萜烷系列呈现C19—C26阶梯状依次降低，表明这类原油的烃源岩沉积时水体较浅，还原性相对较弱，且原始生烃母质中被子植物来源的陆源有机质贡献较大。由此表明北部湾盆地南北不同凹陷第三纪的沉积特征和有机质生源构成存在显著差异。 相似文献
19.
东濮凹陷盐湖相油气成因与成藏机理研究薄弱。采用色谱/质谱(GC/MS)等常规技术,结合傅立叶变换离子回旋共振质谱、单体烃碳同位素技术,对东濮凹陷北部文明寨、卫城地区油气特征及其成因进行了解剖。结果表明,该区原油具有植烷对姥鲛烷优势显著、伽马蜡烷富集、升藿烷“翘尾”、甾烷异构化程度较低等咸水、盐湖相原油的典型特征。原油还具有正构烷烃单体烃碳同位素呈低碳重、高碳轻、近两段式分布的特征,与柴达木盐湖相原油有所差异。原油中检测到丰富的S1、S2、O1S1、N1、O1、O2、O3等芳构化程度较低的NSO化合物,其与该区低熟油的形成关系密切。油-油、油-岩详细对比表明,东濮凹陷北部原油主要来自埋深超过3 000 m的沙三—沙四段烃源岩、存在不同成熟度原油混合聚集现象。研究结果对该区进一步油气勘探具有重要指示意义。 相似文献
20.
渤海湾盆地南堡凹陷原油成因类型及其分布规律 总被引：8，自引：3，他引：5
南堡凹陷近年油气勘探取得了重大突破,为揭示该区滩海与陆地油气成因及分布规律,对67个原油和油砂样品进行了详细的地球化学研究。南堡凹陷原油具有低硫、中高蜡含量特征,陆相成因特点显著。共分为4种类型原油:(1)陆地沙三段深部层系原油,具有高4-甲基甾烷丰度、低奥利烷丰度与低甲基菲指数值和轻微偏高成熟度特征;(2)陆地Es1—Ed原油与Ng和Nm原油,其特征与第一类原油相反;上第三系原油普遍遭遇生物降解;(3)滩海东营组原油,以较高伽马蜡烷/C30藿烷和高甾烷/藿烷值区别于陆地原油;(4)滩海奥陶系潜山原油,具有低丰度甾萜类生物标志物、相对高丰度孕甾烷、三环萜烷与重排甾烷系列等特征,显示较高成熟度。上述4种成因类型原油指示南堡凹陷陆地、滩海均存在多层导有利烃源岩;同层位中滩海Es1-Ed存在较陆地更为优越的有利烃源岩,南堡滩海地区具有广泛的油气勘探前景。 相似文献