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1.
塔里木盆地经历了多期油气充注和多期调整改造,使得已发现海相油气的确切来源层位与相对贡献量不明。虽然油-源对比研究揭示中上奥陶系烃源岩是这些油气的主要来源,但中上奥陶统内高TOC源岩层分布局限,不足以解释海相油气的大规模分布;并且塔中地区已发现的天然气储量已经远超3次资评结果,以上反映了叠合盆地油气成藏的复杂性与地化反演方法用来进行油源判别研究的局限性。根据叠合盆地混源油气藏的特点,基于正演研究思路,对源岩层生排运聚油气过程进行研究,从源岩总生烃量中依次扣除残留烃量、无效相态损失量、运移损失烃量、构造破坏烃量等4部分,得到最终的远景资源量,并以此计算各源岩层的相对贡献。结果表明,对于塔中地区而言,寒武系-下奥陶统源岩层相对贡献量高于中上奥陶统烃源岩,两者比率约为63%比37%;高TOC源岩层的相对贡献量高于低TOC源岩层,两者比率约为68%比32%。奥陶系已发现油气藏的规模比预期评价较大原因可能是部分油气来自下部的寒武系烃源岩或者其内部低TOC源岩层也对油气成藏有所贡献。 相似文献
2.
There are abundant bitumens and oil seepages stored in vugs in a Lower-Triassic Daye formation (T1d) marlite in Ni’erguan village in the Southern Guizhou Depression. However, the source of those oil seepages has not been determined to date. Multiple suites of source rocks of different ages exist in the depression. Both the oil seepages and potential source rocks have undergone complicated secondary alterations, which have added to the difficulty of an oil-source correlation. For example, the main source rock, a Lower-Cambrian Niutitang Formation (?1n) mudstone, is over mature, and other potential source rocks, both from the Permian and the Triassic, are still in the oil window. In addition, the T1d oil seepages underwent a large amount of biodegradation. To minimize the influence of biodegradation and thermal maturation, special methods were employed in this oil-source correlation study. These methods included catalytic hydropyrolysis, to release covalently bound biomarkers from the over mature kerogen of ?1n mudstone, sequential extraction, to obtain chloroform bitumen A and chloroform bitumen C from the T1d marlite, and anhydrous pyrolysis, to release pyrolysates from the kerogen of T1d marlite. Using the methods above, the biomarkers and n-alkanes released from the oil samples and source rocks were analysed by GC–MS and GC-C-IRMS. The oil-source correlation indicated that the T1d oil seepage primarily originated from the ?1n mudstone and was partially mixed with oil generated from the T1d marlite. Furthermore, the seepage also demonstrated that the above methods were effective for the complicated oil-source correlation in the Southern Guizhou Depression. 相似文献
3.
柴达木盆地第三系油源对比 总被引：16，自引：3，他引：16
本文利用生物标记化合物,着重讨论了柴达木盆地第三系内陆盐湖相地层中的油源对比问题.主要应用甾烷的母源参数与成熟度参数相结合的方法,和油/岩综合指纹类型曲线对比法.查明了这组同时代但不同成熟度的原油,各有其相应成熟级别(未成熟、低成熟、成熟和高成熟)的源岩.表明它们是不同成烃演化阶段的产物.研究证明,迄今柴达木盆地所找到的石油,大部分是低成熟的,而成熟和高成熟的油气资源还有很大的勘探前景. 相似文献
4.
The Lower Yangtze region is one of the important marine sedimentation areas of oil and gas distribution in southern China,for its favorable source rocks,reservoirs and covers.However,the intense tectonic movements and complex hydrocarbon generation process made it highly impossible to form large-sized oil and gas reservoirs.So it was divided to different hydrocarbon-bearing preservation units in oil-gas exploration.Recent study shows that the Permian and Lower Triassic source rocks in the Lower Yangtze region are complicated in lithology.The hydrocarbon generation potential of limestone there is low while argillaceous source rocks are overall of high abundance with excellent organic types,now in the process of hydrocarbon generation,so differences in high maturity influence the evaluation of organic matter abundance and type.Biomarker characteristics indicate a reductive environment.n-alkanes are marked by a single peak,with no odd-even predominance.The composition and distribution of the carbon numbers of n-alkanes,and the high abundance of long-chain tricyclic terpanes are indicative of marine sedi-mentation.The high contents of pregnane,homopregnane,rearranged hopane suggest that the source rocks are of high maturity.There is a good linear correlation between methylphenanthrene index and vitrinite reflectance.The correlation of oil-source rocks indicated that the oil of Well HT-3 may come from the Permian Longtan Formation in the Huangqiao area,the oil of Wells Rong-2 and Juping-1 came from the Lower Triassic Qinglong Formation in the Jurong area.The exploration here is promising in those different source rocks which all have great potential in hy-drocarbon generating,and oil and gas were produced in the late stage of hydrocarbon generation. 相似文献
5.
跃进斜坡区南北分别为扎哈泉凹陷和英雄岭凹陷,是凹陷油气运移有利指向区,油气来源充足。烃源岩综合评价表明,扎哈泉凹陷E23烃源岩厚度大、分布面积广、有机质丰度高、有机质类型较好,目前已到成熟阶段,具有巨大供烃能力。油源对比研究表明,跃东构造原油与跃进一号构造原油特征一致,为北面英雄岭凹陷来源。跃进二号、乌南-绿草滩和昆北油田原油均来自扎哈泉凹陷E23源岩,但原油成熟度不同。跃进二号原油成熟度较低,与乌南-绿草滩原油和昆北油田储层固体沥青基本一致,明显低于昆北油田原油,属于烃源岩低成熟-成熟阶段早期产物,跃进斜坡区尚未发现源岩生烃高峰期产物。跃进斜坡区相对昆北油田更靠近凹陷生烃中心,源岩生烃高峰期产物具有优先充注的特征,斜坡区下倾方向大量发育的岩性圈闭和构造-岩性圈闭具有巨大的勘探潜力。 相似文献
6.
南黄海盆地古近系烃源岩生烃潜力及原油来源,目前研究比较薄弱.通过对南部坳陷烃源岩和原油样品的有机地球化学分析,揭示古近系烃源岩和原油地球化学特征,并进行油源对比.结果表明南部坳陷古近系烃源岩主要发育在阜四段和阜二段,有机质丰度中等-好,有机质类型为Ⅱ2-Ⅲ型,有机质为低成熟-成熟阶段.阜四段烃源岩形成于贫氧、较高盐度环境,阜二段烃源岩形成于厌氧、相对低盐度环境.原油的饱和烃含量较高,UCM鼓峰较小,已进入成熟阶段,对比结果显示戴南组原油可能来源于阜四段烃源岩,而阜三段原油可能与阜二段烃源岩有关. 相似文献
7.
Hydrocarbon maturation modeling of Paleocene to Lower Miocene source rocks in the Niger Delta Basin: implications for hydrocarbon generation 总被引：1，自引：0，他引：1
This study evaluates the hydrocarbon generation potentials and time of generation for Paleocene to Lower Miocene source rock horizons from A-1, B-1, B-2, and C-1 wells in the Niger Delta Basin using 1D Petromod modeling software. Wells A-1, B-1 and B-2, and C-1 are located within the Central Swamp, the Coastal Swamp, and the Shallow Offshore depobelts, respectively. The thermal history was derived from the rifting–subsidence heat flow model. Maturity modeling were carried out by using Easy%Ro kinetic model and a heat flow history predicting present-day heat flow which were calibrated with measured temperature data. Results of the study suggest that these potential source rocks have attained maturity status to generate hydrocarbons, with vast differences existing in the timing of the onset of oil generation. Basin modeling suggests that Paleocene source rocks entered the oil generative window from the Oligocene to Miocene times with thermal maturity window that varies from gas generation to early-mature phase. The Eocene source rocks have also attained maturity from Miocene to Pliocene times, and their thermal maturity ranges from gas generation to early maturity stage. The Oligocene source rocks also began to generate oil during the Miocene and are currently within the early-mature to mid-mature stage. The thermal maturity window for the Lower Miocene source rocks ranges from immature to early-mature stage. The present modeling results reveals that higher levels of thermal maturity are attained in areas with high geothermal gradients and heat flow values while the cooler areas exhibits lower levels of maturation. The onset of the oil window lies at 2859 m at A-1 (Central Swamp), 3240 m at B-2 (Coastal Swamp), 4732 m at B-1 (Coastal Swamp), and 4344 m at C-1 (Shallow Offshore). The depth to the onset of oil window is found deeper in the Shallow Offshore and western parts of the study area than in the eastern and northwestern parts. The result of this study suggest that the Paleocene, Eocene, Oligocene, and Lower Miocene source rocks are the principal source rocks for oil and gas generation in the Niger Delta Basin. 相似文献
8.
Oil families and their source rocks in the Weixinan Sub-basin, Beibuwan Basin, South China Sea 总被引：2，自引：0，他引：2
Baojia Huang Xianming Xiao Dongsheng CaiR.W.T. Wilkins Mingquan Liu 《Organic Geochemistry》2011,42(2):134-145
Thirty-one crude oils and 15 source rocks were selected for molecular geochemical and isotopic analyses in order to establish the genetic relationships between discovered oils and petroleum source rocks in the Weixinan Sub-basin, Beibuwan Basin, South China Sea. Three groups of oils were recognized. Group I oils are only found in the upper section of the Liusagang Formation, with a moderate abundance of C30 4-methylsteranes, low oleanane contents and lighter δ13C values, showing a close relation to the shale occurring in the upper section of the Liusagang Formation. Group II is represented by the majority of the discoveries and is distributed in multi-sets of reservoirs having different ages. The oils are characterized by a high abundance of C30 4-methylsteranes, low to moderate abundance of oleanane and heavy δ13C values, and shows a good correlation with the lacustrine shale and oil shale in the middle section of the Liusagang Formation. Group III oils occurred in the lower section of the Liusagang Formation. The oils have a lower concentration of C30 4-methylsteranes, relatively high abundance of oleananes and their δ13C values are intermediate. Oils of this group correlated well with the shallow lake-delta mudstone of the lower section of Liusagang Formation. These oil-source genetic relationships suggest a strong source facies control on the geographic distribution of oil groups within the Weixinan Sub-basin. The geochemical data indicate shale in the middle section of the Liusagang Formation has an excellent oil generation potential and the lower and upper sections contain dark shale and mudstone with good to fair oil potential. Future exploration or assessment of petroleum potential of the sub-basin could be improved by considering the proposed genetic relationship between the oil types and source rocks, as well as their distribution. 相似文献
9.
应用岩石热解数据S2-TOC相关图进行烃源岩评价 总被引：1，自引：0，他引：1
应用岩石热解数据评价烃源岩的传统方法具有一定的局限性。由于矿物基质的吸附或“死碳”的影响,有机质类型的“范氏图解”往往夸大烃源岩有机质类型的非均质性。对松辽盆地上白垩统不同有机质丰度和有机质类型的烃源岩生烃动力学研究表明,它们具有相似的生烃动力学特征,说明尽管有机质丰度存在较强的非均质性,但其有效源岩类型（区别于应用范氏图划分的有机质类型）是一致的。这些烃源岩的岩石裂解烃（S2）与有机质丰度（TOC）的相关系数很高,与生烃动力学的分析结果一致,表明应用S2-TOC相关图划分烃源岩的有机质类型可以更真实地反映烃源岩的有效源岩类型,S2-TOC相关图是评价烃源岩有效源岩类型的有效手段。过去岩石热解数据用于反映烃源岩成熟度的主要指标是tmax,tmax对于偏Ⅱ／Ⅲ型的烃源岩比较适用,而对于Ⅰ型烃源岩,由于生油窗内变化不明显,tmax不能完全反映有机质的成熟过程;而且tmax也受运移油等其他因素影响。不同成熟度的烃源岩的S2-TOC图分析结果显示,随着成熟度的增加,S2-TOC的回归斜率和TOC逐渐减小;利用不同成熟度的烃源岩建立的S2-TOC图可用于评价烃源岩的成熟度。松辽盆地不同沉积相中烃源岩的S2-TOC相关图的特征表明。只要有有利的有机质保存条件,各沉积相下均可发育优质的烃源岩;S2-TOC相关图可以反映烃源岩形成的沉积环境和有机质保存条件。 相似文献
10.
大陆架科学钻探CSDP-2井不仅完成了南黄海盆地中部隆起的首次钻探,也创造了陆架区2 843.18 m的全取心深钻记录。在CSDP-2井钻遇的三叠系青龙组（T1q）,二叠系大隆组（P3d）、龙潭组（P2-3l）、孤峰组（P2g）、栖霞组（P1q）和志留系坟头组（S1f）等多层段岩心中探获了多类型、多级别的油气显示,且二叠系3个油砂样品表明该区曾经历过大规模的油气运聚过程。地球化学分析、油源对比结果表明：1#油砂和2#油砂层段均表现出"近源成藏"的特征,其中大隆组1#油砂中的原油与大隆组、龙潭组上段泥岩的亲缘关系明显,龙潭组2#油砂中的原油与龙潭组下段、孤峰组和栖霞组烃源岩具有更好的亲缘关系;3#油砂中的原油成熟度明显偏低,推测其可能来自两侧坳陷区的白垩系、古近系烃源岩;盆地模拟和含烃流体包裹体测温相互印证,明确了CSDP-2井揭露的四套烃源岩与三套储集层之间存在着"接力式"生烃和"波浪式"充注的多期成藏特征,同时得益于三套盖层的良好封盖,彰显了研究区较为广阔的海相油气勘探前景。 相似文献
11.
准噶尔盆地西南缘四棵树凹陷主要分布侏罗系、白垩系和古近系3套潜在烃源岩,其中侏罗系八道湾组烃源岩有机质丰度较高,有机质类型以Ⅲ型为主,部分为Ⅱ2型,生烃潜力较高;三工河组烃源岩有机质丰度、类型明显偏差,生烃潜力较低;西山窑组泥岩有机质丰度较高,但由于受西山窑组沉积末期构造抬升导致地层剥蚀的影响,烃源岩厚度较小,总体上生烃条件较差;白垩系烃源岩在四棵树凹陷最大厚度可达300 m,处于低熟阶段,生烃潜力较小;古近系烃源岩有机质丰度较高、类型好,但成熟度偏低,生烃条件较差。侏罗系八道湾组烃源岩处于主要生油阶段;白垩系烃源岩已达到生烃门限,处于低熟—中等成熟阶段;古近系烃源岩成熟度偏低,目前仍处于未熟到低熟阶段。油源对比表明,四棵树凹陷北部斜坡及车排子凸起带原油主要来源于四棵树凹陷及沙湾凹陷侏罗系烃源灶,后期受到白垩系低熟油源灶的侵染,古近系烃源岩的油源贡献有限。 相似文献
12.
东营凹陷油- 源特征与含油气系统划分 总被引：3，自引：0，他引：3
油源对比是含油气系统划分的基础。针对东营凹陷沙三中、沙三下和沙四上三套有效烃源岩在地球化学特征上的差异,探讨了东营凹陷内三套烃源岩与已知原油之间的空间对应关系及其成因。以油源对比为依据,将东营凹陷划分为沙三中—沙三中亚段（！）、沙三下—沙二、沙三段（！）和沙四上—沙四、沙二段（！）3个含油气系统。分析结果表明,3个含油气系统中已发现的油气藏在空间上具有明显的环状分布特征,其成因模式受控于输导要素组成、油源断层分布位置、烃源岩内砂体的发育规模以及断-砂空间组合等;其中,油源断层和砂体的空间组合关系对东营凹陷不同成因油气藏的形成与分布起主控作用。 相似文献
13.
大王北洼陷精细油源对比 总被引：5，自引：2，他引：3
应用饱和烃生物标志化合物、芳烃、碳同位素和轻烃等地球化学分析资料,多种方法相结合,详细对大王北洼陷3个油田原油进行了油油和油源对比研究。结果表明：大王北洼陷原油具有4种成因类型,分别为来源于沙四段、沙三段、沙一段烃源岩的“沙三型原油”、“沙四型原油”、“沙一型原油”和来源于2套或3套烃源岩的“混合型原油”。“沙三型原油”分布于大王北油田和大65油田,而其它类型原油在英雄滩油田均有分布,并且以受沙三段烃源岩影响的“混合型”为主。沙三段烃源岩是大王北洼陷的主力烃源岩,主力油层内的石油主要是由该层烃源岩贡献的。不同烃源岩的生烃潜力、埋藏生烃演化历史和圈闭的发育历史共同影响了原油类型的分布。 相似文献
14.
油源对比微量元素地球化学研究进展 总被引：2，自引：0，他引：2
原油中的微量元素地球化学组成可以应用于油源对比,指标可以归纳为3类:①所含元素的聚类分析及其所反映的元素分布总体特征;②不同族、不同类型元素的组成,特别是过渡族金属元素;③稀土元素。但对于哪些微量元素可以应用于油源对比,哪些具有普遍意义,在不同地区是否具有适用性,影响其油源对比应用有效性的因素有哪些,主控因素是什么,仍然不甚清楚,由此导致很多方面的认识还不甚成熟,成功应用的实例相对常规的有机地球化学研究不多。原油中的微量元素主要来源于外部成油和运聚环境,在原油生成和运聚过程中,通过烃—水—岩之间的复杂有机—无机相互作用以金属卟啉螯合物、有机络合物或吸附态的形式聚集于原油中,并且沥青质是原油中微量元素的主要载体,元素组成在此过程中发生分异。此外,原油在自身形成与演化过程中也会发生元素组成的分异,影响因素包括油源母质类型、成熟度、次生变化等。在这些过程中,元素地球化学性质的不同会使原油中的元素组成出现差异,基本不发生/少发生变化的元素即可能是好的油源对比指标,这是应用微量元素进行油源对比的原理和理论基础。 相似文献
15.
焉耆盆地侏罗纪煤系源岩显微组分组合与生油潜力 总被引：3，自引：1，他引：2
焉耆盆地为我国西部含煤、含油气盆地, 侏罗系含煤地层是最重要的潜在源岩.对侏罗纪煤系中的暗色泥岩、碳质泥岩和煤层分别进行了有机岩石学、Rock-Eval热解分析和核磁共振分析.泥岩、碳质泥岩和煤层具有不同的有机岩石学和有机地球化学特征, 其中煤层具有3种有机显微组分组合类型, 不同显微组分组合类型的煤层具有不同的生油、生气潜力或倾油、倾气性.基质镜质体、角质体、孢子体等显微组分是煤中的主要生烃组分.侏罗系泥岩、碳质泥岩和煤层具有不同的生物标志物分布特征, 生物标志物组合分析表明焉耆盆地已发现原油是泥岩、碳质泥岩和煤层生成原油的混合产物.含煤地层的地球化学生烃潜力分析和已发现原油的油源对比均表明, 含煤地层不仅是重要的气源岩, 而且可成为有效的油源岩. 相似文献
16.
地质条件下湖相烃源岩生排烃效率与模式 总被引：11，自引：0，他引：11
烃源岩排烃研究是油气地球化学研究中最薄弱的环节,而排烃效率又是准确评价常规油气与非常规页岩油气资源的关键参数。目前对于烃源岩排烃效率的认识差异很大,尚未建立完整的各种类型有机质湖相烃源岩在地质条件下生排烃效率与模式。本文以中国渤海湾、松辽等4个大型湖相含油气盆地以及酒泉青西凹陷、泌阳凹陷等9个中小型湖相富油盆地/断陷为对象,通过15000余个湖相烃源岩样品在自然热演化过程中热解生烃潜力指数的变化研究,揭示了湖相烃源岩在地质条件下的生排烃特征,构建了湖相烃源岩在地质条件下的生排烃效率与模型。无论是大型湖相沉积盆地还是中小型断陷盆地,甚至是盐湖相沉积盆地,烃源岩生排烃特征基本一致。随着成熟度的增高,湖相烃源岩排烃效率逐渐增高,在低成熟阶段排烃效率较低,在成熟与高成熟阶段具有高或很高的排烃效率。Ⅰ型、Ⅱ型有机质类型烃源岩排烃模式相似,相对排烃效率在低成熟阶段小于45%,成熟生油高峰时达85%~90%,至生油窗下限时达90%以上;累积排烃效率在低成熟阶段小于10%,生油高峰时达50%~60%,生油窗下限时达75%~85%,主要的排烃阶段在镜质组反射率0.7%~1.2%之间,生油窗阶段生成并排出了绝大部分烃类。湖相Ⅲ型有机质烃源岩排烃效率明显低于Ⅰ、Ⅱ型有机质烃源岩,生油窗阶段累积排烃效率仅为50%左右,主要生排烃阶段在镜质组反射率0.8%~2.0%之间。控制湖相烃源岩排烃量和排烃效率的主要因素是有机质丰度、类型和成熟度,而盆地类型、断裂发育程度、烃源岩沉积环境、相邻输导层孔渗条件等因素均不影响烃源岩排烃与排烃效率。 相似文献
17.
东濮凹陷北部盐湖相膏盐岩极其发育,膏盐岩对烃源岩性质及生烃特征的影响研究薄弱。采用地质与地球化学相结合途径,探讨了含膏盐岩层系烃源岩特性及其成烃演化规律。结果表明,盐区与无盐区烃源岩的特性有很大差异,北部盐湖相含盐区深灰色、褐色等暗色页岩有机质丰度一般大于15%,有机质类型以Ⅱ1型和Ⅰ型为主,是区内主要的优质烃源岩;南部淡水湖相无盐区主要发育有利生气的Ⅱ—Ⅲ型干酪根,反映东濮凹陷烃源岩的质量及生烃潜能与膏盐岩的发育密切相关。观察到膏盐岩影响烃源岩的成烃演化进程,当膏盐层厚度为50 m时,生油窗的范围显著增加;随着盐岩厚度(>50 m)的增加,湿气窗的范围也逐渐增加;当膏盐岩厚度约400 m时,生油窗范围开始减小,湿气窗的范围仍有增加趋势。膏盐岩对烃源岩“生油气窗”的影响是基于其较高的热导率属性,通过影响地温场而实现。以地质解剖为依据,建立了文留地区含膏盐岩层系烃源岩成烃演化模式。东濮凹陷含膏盐岩层系烃源岩的演化特征对该凹陷及同类含膏盐岩盆地油气勘探具有重要指示意义。 相似文献
18.
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(Ro)、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[qe(max)=27.3×106 t/Ma]远高于中侏罗统的排烃速率[qe(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. 相似文献
19.
大民屯凹陷高蜡油成藏机理研究 总被引：2，自引：1，他引：1
综合利用地质、地球物理、油气(油藏)地球化学及盆地模拟领域中先进的技术与研究方法,以盆地演化和流体输导格架为成藏背景,从有效烃源岩出发,以能量场演化及其控制的化学动力学、流体动力学和运动学过程为核心,探讨了大民屯凹陷高蜡油的成藏机制与分布规律。精细油源对比表明,大民屯凹陷高蜡油主要来自沙四下段的油页岩,且其成因受沉积母质和沉积环境的双重控制。凹陷沉积-沉降演化史与温度场、压力场演化史三者良好的耦合匹配关系,对高蜡油的生成、保存、运聚成藏等地质因素与地质作用都有着重要的意义。高蜡油以近源充注为主,主充注期为37～33Ma。有效源岩分布、能量场演化和流体输导系统及其决定的流体流动样式共同控制了本区高蜡油的富集与分布。 相似文献
20.
Oil generation can be the dominant overpressure mechanism in low permeability source rocks because of the volume increase upon conversion of organic matter to less dense oil during the petroleum generation process. To quantitatively express the relationship between oil generation and overpressure in source rocks, an equation for the pressure change due to oil generation was derived to quantitatively estimate the overpressure generated in the source rock by considering of the episodic fluid expulsion and parameters, such as the residual oil coefficient, source rock porosity, transformation ratio, TOC (total organic carbon), hydrogen index, the compressibility of Type I kerogen, oil and pore water. The equation was then calibrated with the results from physical simulation experiments in a closed pyrolysis system. Sensitivity analyses on the residual oil coefficient, TOC and hydrogen index were performed to investigate the dominant parameters controlling overpressure due to oil generation. A good correlation was achieved between measured overpressure from the physical simulation experiments and the calculated data using the derived equations for the pressure change due to oil generation, suggesting that the equation can be used to quantitatively estimate overpressure caused by oil generation in source rocks. Many parameters can affect overpressure caused by oil generation, including residual oil coefficient, source rock porosity, TOC, hydrogen index, and transformation ratio. Sensitivity analyses indicate that the most effective parameter on the pressure change due to oil generation in the source rocks is the residual oil coefficient, implying that the internal pressure seal for the source rock is the most important parameter for overpressure development caused by oil generation. Overpressure cannot be generated from oil generation if the residual oil coefficient is less than 0.75. Source rock TOC and hydrogen index have moderate effects on the pressure change caused by oil generation. Overpressure can be generated when the TOC content is as low as 0.5% provided the source rocks have a good internal pressure seal. 相似文献