中阿拉伯盆地油气分布规律和主控因素研究

中阿拉伯盆地是中东油气区油气资源最为富集的盆地。本文以该盆地油气田的最新资料为基础,结合盆地构造-沉积演化过程,应用石油地质综合研究方法,探讨该盆地油气的时空分布特征及主控因素。中阿拉伯盆地内发育3个主要含油气系统:下志留统含油气系统、侏罗系复合含油气系统和白垩系复合含油气系统。中阿拉伯盆地油气的层系分布表现为"下气上油",上二叠统—下三叠统储集层富集了盆地内78.9%的天然气可采储量和83.7%的凝析油可采储量,而上侏罗统—下白垩统则富集了盆地内81.9%的石油可采储量。区域上,中阿拉伯盆地的石油储量主要聚集于西海湾坳陷、迪布蒂巴赫(Dibdibah)坳陷、盖瓦尔(Ghawar)凸起和安纳拉(An N`ala)凸起,天然气和凝析油则在卡塔尔凸起更为富集。中阿拉伯盆地的油气分布主要受3个因素控制:优质区域盖层控制了油气的层系分布,主力烃源岩展布和优势运移路径控制了油气的区域分布,基底断裂和盐运动构成的圈闭控制了油气藏的形成与富集。     

澳大利亚西北陆架油气分布规律与主控因素研究

澳大利亚西北陆架油气资源,特别是天然气资源富集,是全球液化天然气的主要供应地之一。西北陆架不仅是澳洲油气勘探潜力最大的地区,而且也是中国油公司拓展海外油气业务的重要地区。以多方面收集的数据资料为基础,探讨澳大利亚西北陆架油气分布规律,揭示油气分布主控因素,进而优选有利勘探区。区域上,已发现的油气储量主要分布于西北陆架最西南端的北卡那封盆地;层系上,油气主要富集于下白玺统泥页岩区域盖层之下的上三叠统、侏罗系或下白玺统碎屑岩储集层。油气分布整体表现为“内油外气、下气上油、以气为主的特征,油田多局限于侏罗纪裂谷作用控制的发育有成熟生油岩的次盆地。腐殖型干酪根类型和烃源岩的高成熟度决定了西北陆架的富气特征,侏罗纪发育的裂谷控制了石油的区域分布。基于油气地质综合研究和油气发现过程,优选出了埃克斯茅斯高地、埃克斯茅斯次盆、巴科一次盆、卡斯韦尔次盆、萨胡尔台地、卡尔德尔地堑和武尔坎次盆7个有利勘探区。     

扎格罗斯盆地含油气系统分析与资源潜力评价

扎格罗斯盆地是全球常规油气资源最富集的前陆盆地。基于最新的数据资料,应用石油地质综合评价和含油气系统分析的方法,研究了扎格罗斯盆地的油气分布和主控因素,以成藏组合为评价单元,评估了油气待发现可采资源量,并探讨了盆地的油气资源潜力和未来的勘探领域。研究表明,盆地发育6套含油气系统,白垩系/古近系复合含油气系统、侏罗系含油气系统和志留系Gakhum含气系统是最重要的含油气系统。区域上,盆地的油气主要分布于迪兹富勒坳陷、基尔库克坳陷和胡齐斯坦隆起;层系上,油气主要储集于古近系、新近系和白垩系。油气分布整体表现为“坳陷富油、隆起富气”的特征,其油气富集的主要控制因素是优质区域盖层、有效烃源岩的展布和新近纪的构造运动。资源评价结果表明,扎格罗斯盆地待发现可采石油、天然气和凝析油的资源量分别为44.6×10⁸t、9.3×10¹² m³和10.4×10⁸t,合计129.8×10⁸t油当量,最有勘探潜力的成藏组合是二叠/三叠系Deh Ram群、Asmari组和西北侏罗系成藏组合。     

民和盆地侏罗系地层划分与对比

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。     

准南前陆冲断带烃源岩地质地球化学特征

准南前陆冲断带具有丰富的油气资源,但与资源评价关系密切的烃源岩研究不足。本文应用地球化学分析方法,对准南前陆冲断带的上二叠统、中下侏罗统、下白垩统和古近系等4套烃源岩的有机质丰度、有机质类型、热演化程度进行了系统分析和综合对比。结果表明,上二叠统烃源岩和中下侏罗统烃源岩为良好的烃源岩,古近系安集海河组其次,下白垩统烃源岩相对较差。     

中亚卡拉库姆盆地油气分布特征与成藏模式

卡拉库姆盆地是世界上仅次于西西伯利亚盆地和波斯湾盆地的第三大富气盆地。本文以获取的最新油气田储量数据为基础，采用石油地质综合分析方法，探讨了该盆地油气的层系和区域分布特征及其成藏模式。受区域盖层控制，盆地内的油气主要富集于两套层系：中侏罗统卡洛阶-上侏罗统牛津阶碳酸盐岩储集层和下白垩统欧特里阶沙特利克组砂岩储集层。前者富集了盆地内68.0%的石油储量、84.0%的凝析油储量和44.2%的天然气储量，后者富集了盆地内36.4%的天然气储量。上侏罗统蒸发岩之下的盐下油气田的区域分布主要受有利储集相带和古隆起构造展布的控制；生物礁和古构造主要发育于盆地东北部的北阿姆河亚盆地，并导致盆地内已发现的盐下油气储量主要分布于此。受蒸发岩区域盖层和深大断裂的控制，盐上油气田主要分布于蒸发岩发育区之外、蒸发岩较薄且主要为硬石膏的地区、以及蒸发岩发育区内的深大断裂附近。蒸发岩之上的盐上层系并非油气特别是天然气勘探的禁区，源自盐下烃源岩的天然气可以在盐上储集层内聚集并形成大气田。     

中国东南海域中生界油气地质条件与勘探前景

中国东南海域中生代地处欧亚板块东南缘, 夹持于欧亚板块、太平洋板块与印度澳大利亚板块之间。以往对于该区域的油气勘探多集中于新生代。笔者在前人研究的基础之上, 结合新近获得的地震资料, 开展了中国东南海域及周缘油气地质条件研究。结果表明:中国东南海域中生界分布广, 东海南部、台湾岛以及台西南盆地发育中生界深海相硅质岩, 可能与冲绳缝合带和菲律宾巴拉望缝合带形成有关;南海北部及周缘陆区发育上三叠统下侏罗统海相和海陆交互相碎屑岩及上侏罗统白垩系陆相碎屑岩, 可能与印支期缝合带的形成有关。从海域钻井及周缘陆区沉积层序资料推断, 中国东南海域有两套发育良好的烃源岩, 具有较强的生烃潜力:上三叠统下侏罗统海相泥页岩, 有机碳质量分数为0.28%~14.96%, 干酪根类型主要以Ⅱ₂型和Ⅲ型为主;下白垩统海相泥页岩, 有机碳质量分数为0.60%~2.00%, 干酪根类型以偏Ⅱ₂Ⅲ型为主。该海域发育两套生储盖组合:一套以上三叠统下侏罗统泥页岩为烃源岩, 中、上侏罗统砂岩为储层, 下白垩统泥页岩为盖层;另一套以下白垩统泥页岩为烃源岩, 白垩系砂岩为储层, 上白垩统泥页岩为盖层。它们相互可以形成"古生新储"、"自生自储"油气藏组合。因此, 中国东南海域中生界是值得关注的油气勘探新领域。     

1D PetroMod software modeling of the Basrah oil fields, Southern Iraq

1D (Petromod) hydrocarbon charge modeling and source rock characterization of the Lower Cretaceous and Upper Jurassic underlying the prolific Cretaceous and Tertiary reservoirs in the Basra oilfields in southern Iraq. The study is based on well data of the Majnoon, West Qurna, Nahr Umr, Zubair, and Rumaila oil fields. Burial histories indicate complete maturation of Upper Jurassic source rocks during the Late Cretaceous to Paleogene followed by very recent (Neogene) maturation of the Low/Mid Cretaceous succession from early to mid-oil window conditions, consistent with the regional Iraq study of Pitman et al. (Geo Arab 9(4):41–72, 2004). These two main phases of hydrocarbon generation are synchronous with the main tectonic events and trap formation associated with Late Cretaceous closure of the neo-Tethys; the onset of continent–continent collision associated with the Zagros orogeny and Neogene opening of the Gulf of Suez/Red Sea. Palynofacies of the Lower Cretaceous Sulaiy and Lower Yamama Formations and of the Upper Jurassic Najmah/Naokelekan confirm their source rock potential, supported by pyrolysis data. To what extent the Upper Jurassic source rocks contributed to charge of the overlying Cretaceous reservoirs remains uncertain because of the Upper Jurassic Gotnia evaporite seal in between. The younger Cretaceous rocks do not contain source rocks nor were they buried deep enough for significant hydrocarbon generation.     

挪威中部陆架油气地质特征及勘探潜力

以收集到的挪威中部陆架最新地质基础资料和油气田资料为依据,归纳总结该区的烃源岩、储集层、生储盖组合及油气运移特征,分析其勘探潜力,为相关公司介入本区的油气勘探提供依据。综合研究结果认为,挪威中部陆架烃源岩主要为下侏罗统re组三角洲平原相泥页岩及煤层和上侏罗统Spekk组海相泥页岩,其中上侏罗统Spekk组海相泥页岩是主力烃源岩;储层主要为白垩系—新近系浊积砂岩和中侏罗统裂谷期Fangst群滨浅海相砂岩,其中主力储层为中侏罗统裂谷期滨浅海相砂岩;发育裂谷期下生上储(正常)和上生下储两种组合模式;油气通过裂缝、疏导层及断层等作短距离汇聚,通过地层不整合面或连通砂体作长距离运移。该区油气成藏条件优越,资源潜力巨大,储量约为73×108桶油当量,待发现油气田约36个,随着油气勘探的逐步展开,挪威中部陆架必将还有重大油气发现。     

扎格罗斯盆地油气成藏特征及分布规律

扎格罗斯盆地是我国油气公司海外勘探的重要区域。基于最新油气田资料,系统分析了盆地的油气地质特征,总结了油气分布规律,并探讨了其主控因素。结果表明扎格罗斯盆地主要发育志留系、三叠系、侏罗系和白垩系四套主力烃源岩及古近系次要烃源岩,其中白垩系烃源岩贡献最大。碳酸盐岩是盆地的主要储层类型,从二叠系至中新统均有分布,其中上白垩统班吉斯坦(Bangestan)群和渐新统-下中新统阿斯马里组(Asmari)是主力产层;碎屑岩为次要储层,大部分位于土耳其境内的托罗斯褶皱带内。受造山运动挤压褶皱作用控制,盆地主要发育背斜构造圈闭,且油气总体上表现出垂向运移的特征。分析认为迪兹富勒坳陷、基尔库克坳陷和帕卜德赫坳陷蕴含了盆地绝大多数的油气资源,且新生界和白垩系的油气最为富集,其分布规律主要受控于烃源岩展布、圈闭分布、断层和裂缝发育程度及区域盖层的共同作用。     

Petroleum geology and exploration direction of gas province in deepwater area of North Carnarvon Basin,Australia

North Carnarvon Basin is a gas province with minor oily sweet spots in deepwater area with water depth more than 500 m, which is one of the hot spots of global petroleum exploration for its series of giant hydrocarbon discoveries in recent years. However, the degree of oil and gas exploration in deepwater area is still low, and the conditions for oil and gas accumulation are not clear. Based on the current exploration situation and latest database of fields, applying multidisciplinary analysis of hydrocarbon geology, hydrocarbon accumulation elements and its exploration direction of North Carnarvon Basin in deepwater area are analyzed. The results show that there are three sets of main source rocks in deepwater area of North Carnarvon Basin, which are Triassic marine shale in Locker Formation and delta coal-bearing mudstone with thin carbonaceous mudstone in Mungaroo Formation, Lower –Middle Jurassic paralic carbargilite and coal measure strata in Athol Formation and Murat Formation, Cretaceous delta mudstone in Barrow Group and marine shale in Muderong Formation. Most source rock samples show gas-prone capability. The coarse sandstone of delta facies in Middle–Upper Triassic Mungaroo Formation is the most important reservoir in deepwater area, Lower Cretaceous Barrow Group deep-water gravity flow or underwater fan turbidite sandstone is the secondly main reservoir. Lower Cretaceous marine shale in Muderong Formation is most important regional caprock. Triassic mudstone in Mungaroo Formation is an important interlayer caprock in deepwater area. There are two main reservoir accumulation assemblages in deepwater area, one is Triassic structural-unconformity plane reservoir accumulation assemblage of Locker Formation to Mungaroo Formation, and the other is Lower–Middle Jurassic Athol Formation and Murat Formation–Lower Cretaceous stratigraphic lithology-structural reservoir accumulation assemblage of Barrow Group to Muderong Formation. There are three main control factors of hydrocarbon Accumulation: One is coupling of source and seal control hydrocarbon distribution area, the second is multi-stage large wave dominated deltas dominate accumulation zone, the third is direction of hydrocarbon migration and accumulation in hydrocarbon-rich generation depression was controlled by overpressure. The south of Exmouth platform in deepwater area is adjacent to hydrocarbon rich depression zone, reservoir assemblage is characterized by “near source rocks, excellent reservoir facies, high position and excellent caprocks ”, which is the main battlefield of deepwater oil and gas exploration in North Carnarvon Basin at present. There are a lot of fault block traps in the northern structural belt of Exmouth platform, and the favorable sedimentary facies belt at the far end of delta plain in Mungaroo Formation is widely distributed, which is the next favorable exploration zone. The Lower Cretaceous, which is located at the concave edge uplift adjacent to the investigator depression and the Exmouth platform, also has a certain exploration prospect in northwest of deepwater area.     

北山盆地群侏罗-白垩系生储盖特征及油气远景

北山地区在前寒武纪变质岩及古生代浅变质岩、火山岩基底之上发育了一系列中——新生代沉积盆地,盆内沉积了厚度较大的侏罗——白垩系,发育侏罗系和下白垩统两套生储盖组合。侏罗系组合在中口子盆地、公婆泉盆地和扎格高脑盆地发育较好,是本区寻找侏罗系油气藏的有利地区。下白垩统组合在中口子盆地、公婆泉盆地、扎格高脑盆地和黑鹰山盆地发育较好,但埋藏浅,缺乏区域性盖层,其石油地质条件不如侏罗系组合。油气勘探实践表明,该区含油气远景取决于油气保存条件和区域盖层的发育情况。     

北黄海盆地东部坳陷中生界烃源岩特征及其指示的油气勘探方向

为了量化表征北黄海盆地东部坳陷中生界主力烃源岩生、排烃特征,综合利用镜质体反射率(R_o)、残余有机碳含量(TOC)、岩石热解、干酪根镜检及饱和烃色谱等资料,在总结研究区烃源岩地化特征的基础上,通过油源对比明确主力烃源岩层并依托盆地模拟方法量化其生、排烃贡献.结果表明,北黄海盆地东部坳陷中生界的两类原油均来源于区内中侏罗统和上侏罗统两套主力烃源岩层,其中,中侏罗统烃源岩的有机质丰度整体处于"好-最好"级别,上侏罗统烃源岩的有机质丰度则以"中等-好"为主;二者均存在早白垩世末期和早中新世两次生、排烃高峰,但上侏罗统的排烃速率[q_e(max)=27.3×106 t/Ma]远高于中侏罗统的排烃速率[q_e(max)=4.2×106 t/Ma],对研究区油气成藏的贡献更大.虽然下白垩统暗色泥岩的生烃潜力有限,但其底部砂岩与紧邻上侏罗统主力烃源岩层构成的"下生上储"式的源储配置关系是区内最重要的勘探目的层,其次为中、上侏罗统内部"自生自储"式的有利成藏组合,同时,中侏罗统下部"上生下储"式的成藏组合也应予以重视.      

Contribution to study of evolution of the folding process within the tectonic cycle

Afghanistan consists largely of a series of continental fragments that, moving northward, docked and accreted to the southern proto-Asia continent. The tectonization of the accreted terranes is generally severe and petroleum prospects are limited essentially to the 48,000 mi² (124,000 km²) North Afghanistan basin. This basin represents the Afghan portion of the Turanian platform, plus the orogenic belt around its southern and eastern perimeter. Exploration to date is judged to be preliminary in character, with some 5 trillion cubic feet (TCF) of gas and 80 million barrels of oil being discovered by 1980. There are two types of traps: Mesozoic low-amplitude drapes or tilted fault blocks, and Neogene highamplitude folds. Appreciable reservoirs are limited to three horizons—Upper Jurassic, Lower Cretaceous, and Paleogene—of which the Lower Cretaceous is considered to be the best. Source rock is confined largely to the Lower and Middle Jurassic shales. Upper Jurassic evaporites form a barrier between the Jurassic source shales and the Lower Cretaceous reservoirs and Neogene folds. There appear to be five principal plays, and estimated total recoverable petroleum in them is 300 million barrels of oil, 9.6 TCF of gas, and 145 million barrels of condensate.     

阿富汗-塔吉克盆地含油气系统特征与资源潜力

阿富汗-塔吉克盆地是中亚地区常规油气具有良好勘探潜力的前陆叠合盆地之一。基于最新的数据资料,应用石油地质综合评价和含油气系统分析的方法,本文研究了阿富汗-塔吉克盆地的油气分布规律及主控因素,以成藏组合为评价单元,评估了油气待发现可采资源量,并探讨了油气资源潜力和未来勘探领域。研究表明,盆地发育2套主力含油气系统,分别为中下侏罗统-卡洛夫牛津阶含油气系统和始新统/下白垩统-古新统Bukhara含油气系统。区域上,盆地的油气主要分布于西南吉萨尔隆起和苏尔汉坳陷,盆地总体表现为"贫油富气"特征。其中,74.0%的天然气储量分布在西南吉萨尔隆起,71.5%的石油储量分布在苏尔汉坳陷,几乎所有凝析油都分布于西南吉萨尔隆起。层系上,油气在侏罗系、白垩系以及古近系分布,但集中分布于侏罗系。油气分布整体表现出"盐上构造圈闭富油,盐下地层圈闭聚气"的特征,有利生储盖组合和局部构造控制盐下层系油气分布,新生代构造运动等控制盐上层系油气分布和富集程度。资源评价结果表明,阿富汗-塔吉克盆地待发现可采石油、天然气和凝析油的资源量分别为202.74 MMbbl、8680.15 Bcf和126.65 MMbbl,合计油当量1776.09 MMboe,最具有勘探潜力的成藏组合为中上侏罗统卡洛夫-牛津阶成藏组合。     

Genetic characterization of gas shows in the east Mediterranean offshore of southwestern Israel

Drilling in the eastern continental margin of the Levant Basin (southeastern Mediterranean), offshore southwestern Israel encountered light oil shows, numerous vertically stacked gas pockets and, more recently, commercial gas discoveries. Chemical and stable isotopic compositions obtained for 24 gas samples from Middle Jurassic to Pliocene reservoir rocks suggest that they represent a few genetic systems which are distributed vertically in the section in accordance with the stratigraphy. These groups include bacterial gas in the Pliocene, a mixture of bacterial and thermogenic gas in the Lower Cretaceous, and thermogenic gas in the Jurassic section. The bacterial gases in the Pliocene and the Lower Cretaceous appear not to be cogenetic, and likewise the thermogenic gas in the Lower Cretaceous and the Jurassic sections. Excluding one case, where the thermogenic gas appears to represent phase separation from a probably cogenetic light oil, the relationship of either the bacterial or other thermogenic gas samples to particular potential source rocks in the section or to light oil shows encountered in the Middle Jurassic section is at this stage inconclusive.     

地球内部物质物性的原位高温高压研究：大体积压机与同步辐射源的结合

四川盆地是一个大型复合含气为主、含油为辅的叠合盆地。多旋回的沉积演化过程,孕育了多套海相、陆相烃源岩,且不同区域发育不同成因类型的烃源岩。目前下寒武统、志留系、下二叠统、上二叠统和上三叠统五套主要烃源岩均已进入高演化阶段,并以成气为主。由于多阶成烃、混源聚集和后期遭受TSR次生蚀变等成藏过程的复杂性使得天然气组分较干、碳同位素组成复杂,常规方法进行气源对比较困难。文中在对四川盆地沉积演化背景分析的基础上,通过对有效烃源岩发育特征和分布规律的探讨,分区域进行了气藏的分析,特别是对天然气组分、非烃组成(H2S、CO2、N2等)和碳同位素等资料综合研究的基础上,基本确定了各区块各含气层系的主力源岩。认为川东主力产层石炭系、三叠系和二叠系的气源分别为志留系、上二叠统龙潭组和下二叠统;川南气区震旦系灯影组、寒武系、二叠系和三叠系产层的气源分别主要来自下寒武统,上、下二叠系源岩;川西气区侏罗系和三叠系须家河组主产层的气源主要来自三叠系须家河组煤系烃源岩,下二叠统和嘉陵江组产层气源则可能主要来自二叠系;川中主要为产油区,下侏罗统自流井群原油应来自侏罗系源岩,浅部层系气源为上三叠统须家河组的陆相烃源岩,深部气藏则为寒武系烃源岩。由于川东北部烃源岩发育层数最多,且质量都较好,因此川东北部是烃类最富集的地区,也是勘探潜力最大的地区。     

柴达木盆地北缘侏罗系层序地层与沉积相研究

依据钻井、露头的生物地层研究成果 ,特别是以冷科 1井的生物地层标定为基础 ,应用层序地层学理论对柴北缘覆盖区侏罗系进行了地震地层的追踪对比与地震相、沉积相研究 ,并探讨了层序格架内烃源岩、储层的发育特征。其结果表明 ,柴北缘侏罗系可划分为 5个层序、11个体系域。其中 ,下侏罗统可划分为两个层序 ,沉积相均以扇三角洲与半深湖—深湖相为特征 ;中侏罗统为一个层序 ,沉积相主体为河流、沼泽相 ,仅该层序顶部发育浅湖—半深湖相 ;上侏罗统为两个层序 ,沉积相以氧化宽浅湖、三角洲、河流为特征。烃源岩发育于中下侏罗统中。而侏罗系砂体分布广泛 ,可构成天然气的优质储层 ,部分可构成原油的良好储层     

中国中西部类前陆盆地与典型前陆盆地类比及其油气勘探前景

中国中西部广泛发育中新生代类前陆盆地，其地质结构和石油地质条件等方面与典型前陆盆地既有类似之处也存在明显差异，主要表现在演化历史复杂；石炭纪以前均为构造性质各异的海相盆地，二叠纪为海相盆地向陆向盆地的转换过渡时期，三叠纪以后基本为陆相盆地（仅塔里木西南盆地晚白垩世-早第三纪有短暂海侵），侏罗纪-白垩纪为断陷-坳陷盆地西部），第三纪以后，逐渐转变为类前陆盆地（西部），在生烃条件方面不仅发育海相烃源岩，且普遍存在煤系烃源岩，进一步增加了其生烃潜力，同样，在储集条件方面，中国类前陆盆地除发育海相储集层外，还广泛分布陆相储集层，因此，中国类前陆盆地基本石油地质条件与国外富油气前陆盆地相比，除海相烃源岩的质量不及后者外，其它方面并无明显不足，且具有发育陆相烃源岩和储集岩的优势，因此，中国中西部类前陆盆地具有较好的勘探前景，特别是陆相层序具有更为现实的勘探价值。     

Characteristics and evaluation of Mesozoic source rocks in the southeastern East China Sea continental shelf

Source rocks are the material basis of oil and gas generation and determine the potential resources of exploration blocks and have important research value. This paper studies the lithology, thickness, and geochemistry of Mesozoic source rocks in the southeastern East China Sea continental shelf. The results show that the Mesozoic source rocks are mainly dark mudstone and coal-bearing strata. The total thickness of Lower–Middle Jurassic source rocks ranges from 100 m to 700 m, and that of Lower Cretaceous source rocks ranges from 50 m to 350 m. The overall thickness of Mesozoic source rocks is distributed in the NE direction and their thickness center is located in the Jilong Depression. The Lower–Middle Jurassic source rocks are mainly developed shallow marine dark mudstone and transitional coal measure strata. Those of the Lower Cretaceous are mainly mudstone of a fan delta front. Lower–Middle Jurassic and Lower Cretaceous hydrocarbon source rocks are dominated by type III kerogen, with Lower–Middle Jurassic hydrocarbon source rocks having high organic matter abundance and being medium–good hydrocarbon source rocks, while Lower Cretaceous hydrocarbon source rocks have relatively poor quality. From northwest to southeast, the vitrinite reflectance Ro of Mesozoic source rocks increases gradually. Source rocks in the study area are divided into three types. The first hydrocarbon-generating area is mainly located in the southeastern region of the study area, and the Jilong Depression is the hydrocarbon-generating center. The results of this study can provide a basis for exploration of Mesozoic oil and gas resources in the southeastern East China Sea continental shelf.© 2019 China Geology Editorial Office.