东濮凹陷北部盐湖相原油特征与成因

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。     

Origin of sulfur rich oils and H2S in Tertiary lacustrine sections of the Jinxian Sag,Bohai Bay Basin,China

Very high S oils (up to 14.7%) with H₂S contents of up to 92% in the associated gas have been found in the Tertiary in the Jinxian Sag, Bohai Bay Basin, PR China. Several oil samples were analyzed for C and S stable isotopes and biomarkers to try to understand the origin of these unusual oil samples.The high S oils occur in relatively shallow reservoirs in the northern part of the Jinxian Sag in anhydrite-rich reservoirs, and are characteristic of oils derived from S-rich source rocks deposited in an enclosed and productive stratified hypersaline water body. In contrast, low S oils (as low as 0.03%) in the southern part of the Jinxian Sag occur in Tertiary lacustrine reservoirs with minimal anhydrite. These southern oils were probably derived from less S-rich source rocks deposited under a relatively open and freshwater to brackish lake environment that had larger amounts of higher plant inputs.The extremely high S oil samples (>10%) underwent biodegradation of normal alkanes resulting in a degree of concentration of S in the residual petroleum, although isoprenoid alkanes remain showing that biodegradation was not extreme. Interestingly, the high S oils occur in H₂S-rich reservoirs (H₂S up to 92% by volume) where the H₂S was derived from bacterial SO₄ reduction, most likely in the source rock prior to migration. Three oils in the Jinxian Sag have δ³⁴S values from +0.3‰ to +16.2‰ and the oil with the highest S content shows the lightest δ³⁴S value. This δ³⁴S value for that oil is close to the δ³⁴S value for H₂S (∼0‰). It is possible that H₂S was incorporated into functionalized compounds within the residual petroleum during biodegradation at depth in the reservoir thus accounting for the very high concentrations of S in petroleum.     

Characterization of the hydrogen isotopic composition of individual n-alkanes in terrestrial source rocks

In order to characterize the H isotopic compositions of individual lipid compounds from different terrestrial depositional environments, the δD values of C-bound H in individual n-alkanes from typical terrestrial source rocks of the Liaohe Basin and the Turpan Basin, China, were measured using gas chromatography–thermal conversion–isotope ratio mass spectrometry (GC–TC–IRMS). The analytical results indicate that the δD values of individual n-alkanes in the extracts of terrestrial source rocks have a large variation, ranging from −140‰ to −250‰, and are obviously lighter than the δD of marine-sourced n-alkanes. Moreover, a trend of depletion in ²H(D) was observed for individual n-alkanes from different terrestrial depositional environments, from saline lacustrine to freshwater paralic lacustrine, and to swamp. For example, the δD values of n-alkanes from a stratified saline lacustrine environment vary from −140‰ to −200‰, δD for n-alkanes from swamp facies range from −200‰ to −250‰, while those from freshwater paralic lacustrine–lacustrine environments fall between the δD values of the end members. The shift toward lighter δD from saltwater to freshwater environments indicates that the source water δD is the major controlling factor for the H isotopic composition of individual compounds. In addition, H exchange between formation water and sedimentary organic matter may possibly be important in regard to the δD of individual n-alkanes. Therefore, other lines of geochemical evidence must be considered when depositional paleoenvironments of source rocks are reconstructed based on the H isotopic composition of individual n-alkanes.     

东濮凹陷原油含硫化合物的分布特征及其应用

东濮凹陷盐湖相原油中杂原子化合物研究薄弱。采用高分辨率质谱结合色谱-质谱技术,对东濮凹陷盐湖相、淡水湖相原油中的含硫化物进行了检测。结果表明,原油中含有丰富的含硫化合物,S1和O1S1占绝对优势,咸水相原油富含S1类、淡水相原油相对富集O1S1类,指示O1S1/S1具有原始沉积环境指示意义。东濮盐湖相原油中的硫化物富含碳数为C27-35、C40的化合物,与原油中丰富的甾类、藿烷类与β-胡萝卜类化合物碳数相吻合,指示菌藻类、色素类生源的重要贡献。随成熟度增加,硫化物缩合度增加、烷基侧链碳数范围降低,相关参数DBE6/DBE12-S1、DBE3+6/DBE12+15+18-S1等可用于辅助评价原油成熟度。东濮低熟油含有丰富的低热稳定性硫化物,指示富硫干酪根和/或富硫大分子低温降解是低熟油形成的重要机制之一。     

东营凹陷原油单体烃碳同位素特征及其在油源识别中的应用

为揭示东营凹陷部分复杂成因油气的来源,对该区原油、烃源岩单体烃碳同位素进行精细特征分析与油源追踪。东营凹陷不同成因原油具有不同正构烷烃单体烃碳同位素特征。沙三段淡水成因原油碳同位素曲线分别以nC₁₅、nC₃₂为主峰,碳同位素总体偏重、前峰极其富集13C;沙四段咸水成因原油一般以nC₂₃为分界线,近似呈对称的双峰分布,δ¹³C值较沙三段成因原油的轻。沙三段、沙四段成因原油碳同位素分别与沙三段、沙四段烃源岩的聚类相关。牛庄洼陷沙三中段透镜体岩性油气藏原油单体烃碳同位素值介于沙三段、沙四段烃源岩之间,与沙四段烃源岩及相关原油具有更好的相关性,验证以往关于牛庄洼陷沙三中段隐蔽油气藏原油为沙三段、沙四段成因的混源油观点。东营凹陷南斜坡孔店组原油碳同位素总体相对较轻、近直线型分布,与孔店组烃源岩、黄骅坳陷孔店组成因原油的碳同位素曲线聚类相关,指示其与孔店组烃源岩具有成因联系。在正常油窗范围内,成熟度对东营凹陷烃源岩及相关原油碳同位素的影响较小,后者主要受控于母源与古沉积环境。单体烃碳同位素可以很好地应用于东营凹陷油气成因与油源研究,该方法是对以往生物标志物地球化学研究的补充与深化。     

Depositional Environment of Es_4~u and Es_3~l Shales Based on Biomarkers from the Boxing Sag of Dongying Depression,East China

The Boxing Sag is located in the southwest of Dongying Depression, southern Bohai Bay Basin of East China. It is one of the main petroliferous sags in the Dongying Depression, and has two major source rocks, namely the upper 4th Member （Es4u） and lower 3rd Member （Es31） shales of Eocene Shahejie Formation, which are the new exploration targets in recent years. In this study, 16 core samples were collected from Es4u and Es31 shales in the Boxing Sag, and the saturate hydrocarbons were analyzed by gas chromatography （GC） and gas chromatography-mass spectrometry （GC-MS）, respectively. The results show that Es4u shale has obvious phytane and gammacerane predominance, higher concentration of tricyclic terpanes and regular steranes, and very low concentration of 4- methly steranes; Es31 shale has pristane predominance, lower concentration of tricyclic terpanes, gammacerane and regular steranes, and higher concentration of 4-methly steranes. The Es4u shale can be further divided into two types based on the distribution of n-alkanes in gas chromatograms： normal distribution and double peak pattern. The biomarker characteristics and sedimentary facies distribution show that Es4u shale was deposited in the saline-hypersaline semi-deep （Type A Es4u shale, sag center） to shallow （Type B Es4u shale, sag edge） lacustrine environments, Es31 shale was deposited in the freshwater-brackish semi-deep-deep lacustrine environments, and the former sedimentary facies maps of Es4u and Es31 in the Boxing Sag are further modified.     

四环聚异戊二烯类化合物:中国东部断陷湖盆新分子化石

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。     

Charactristics of the Biomarkers from Nonmarine Crude Oils in China—A Review

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.     

渤海湾盆地临南地区有效油气运聚系统分析

临南地区原油来源于临南洼陷沙三段富有机质成熟烃源岩,其中部分原油受到轻微的生物降解和水洗作用。根据轻烃、生物标志物组成及油源对比结果,将临南洼陷分为南北两个油源区,在渐新世末和中新世末两期油气运聚过程中,形成了四个有效油气运聚系统。各运聚系统的油气沿一定主导方向运移,除已知油田外,位于该主导方向上的曲堤地垒是有利勘探方向。     

The importance of sulfur isotope ratios in the differentiation of Prudhoe Bay crude oils

Sulfur isotopic analyses have been completed for eight Triassic, Jurassic and Lower Cretaceous oils from the Prudhoe Bay field, Alaska. Results presented complement earlier work and further indicate the diagnostic importance of δ ³⁴S values in correlation studies of crude oils. The present work supports an earlier contention that Kuparuk River, Sadlerochit and Lisburne crude oils have a similar source of origin, distinct from that of Kingak oil. If Kingak and Shublik Formations contribute to the Sag River Sand crude oil in the Prudhoe Bay area of Alaska, the same may not be the case for Sag River Sand oil in the Point Barrow area which apparently originated from a different source or combination of sources.     

Controls of oil family distribution and composition in nonmarine petroleum systems: A case study from Inner Mongolia Erlian basin,Northern China

The Erlian basin is a continental rift basin located in Inner Mongolia, Northern China. It is a typical representative of Cretaceous Northeast Asian Rift System, which includes many small petroliferous basins in Mongolia Republic and Northern China. Although Lower Cretaceous source rocks are understood to be most important in the Erlian petroleum systems, the precise identification of these source rock intervals and their determination on oil families distribution and composition are poorly understood in this tectonically complicated, nonmarine basin. New bulk data have been gathered from source rock intervals, oil sands and crude oil samples in eight main oil-producing subbasins. Geochemical analyses indicate that Lower Cretaceous Aershan formation (K₁ba) and Tengger 1 formation (K₁bt₁) are two main source intervals in the Erlian basin and their source rock facies vary from profundal lacustrine to marginal lacustrine according to biomarker and trace elements calibration, the profundal lacustrine facies is characterised by brackish water and anoxic environment, which is similar to their correlative oils (Family 1 oils). The marginal lacustrine facies is characterised by freshwater and suboxic environment, which sourced the most common Family 2 oils. Meanwhile, different maturation processes exercise the second control on oil groups and their compositions, the profundal lacustrine source rocks characterised by their sulphur-rich kerogens lead to two oil groups (group 1 and group 2 oils), whose maturity range from low to normal; while, the marginal lacustrine source rock only lead to normal-maturity oils. At last, biodegradation affected the composition of a certain oils and formed group 4 heavy oils. In addition, short migration distance in small subbasins made the contamination or fractionation less notable in the Erlian basin.     

地震相干分析技术在埕岛油田断裂解释和砂体预测中的应用

三维地震相干数据分析技术是近年发展起来的一项新技术,在解释断层和识别沉积相（砂体预测）等地质特征研究方面有独特效果.为了解决埕岛油田埕北302潜山复杂断层解释和埕北凹陷沉积相分析两项问题,采用了相干分析技术对三维地震资料进行了处理,解释出了埕北302潜山区块众多次级断层和裂缝,识别出了埕北凹陷馆陶组上段沉积相、沉积亚相并预测了有利砂体,得到了满意的研究结果.本文在简要介绍三维地震相干数据体分析技术原理基础上,重点分析了该技术在埕岛油田断裂系统解释和沉积相（砂体）预测中的具体应用并展示了成果,证实了地震相干分析的技术优势以及在油田应用的广泛前景.     

柴达木盆地原油碳同位素组成的主控因素与成因类型

对采集于柴达木盆地16个油田的40个原油进行了碳同位素测定,研究了它们碳同位素组成特征、主控因素及其成因类型。结果表明,柴达木盆地西部地区和北部地区原油碳同位素组成具有显著的差别,西部地区原油富集13C,北部地区原油富集12C。研究发现,成油环境(如盐度和湿度)是决定西部盐湖相原油碳同位素组成及其变化的主要因素,母源性质则控制了北部淡水湖沼相原油的碳同位素组成和变化。根据原油的碳同位素组成和Ph/nC₁₈比值特征,将柴达木盆地原油划分为五种成因类型。     

Sedimentology and seismic geomorphology of a lacustrine depositional system from the deep zone of the Gaoyou Sag,Subei Basin,eastern China

Sandstones of the Dainan Formation in the Gaoyou Sag of the Subei Basin are important hydrocarbon reservoirs. This paper studies the sedimentary facies and sandstone dispersal patterns in the Gaoyou Sag, based on the analysis of sedimentology and seismic geomorphology. The data used in this study include lithological data, wire-line-log data and three-dimensional (3D) seismic data. The target strata are the Eocene Daiyi Member (E₂d₁³, E₂d₁² and E₂d₁¹) and the lower Dai'er Member (E₂d₂⁵), which belong to three third-order sequences. Five types of depositional systems were identified in the Dainan Formation based on core observation and log-facies analysis. They are, respectively, delta, fan delta, sub-lacustrine fan, nearshore subaqueous fan and lacustrine system. Stratal slices from 3D seismic volumes have been used to map the sandstone dispersal patterns and to document the evolution of the depositional systems within these third-order sequences and associated systems tracts. In the low-stand systems tract and the high-stand systems tract, sandstones of delta, fan delta and nearshore subaqueous fan were well developed and can be delineated by stratal slices showing distinct progradation towards the deep lake centre. In the transgressive systems tract, sandstones are less common. Stratal slices indicate that the depositional environments of individual third-order sequences evolved from gravel-rich or sand-rich fans to lacustrine mudstones, and finally to mixed sandstone–mudstone fans. Sandstone dispersal patterns appear to be primarily controlled by syn-sedimentary faults, and generally sandstone thickness decreases with distance from the syn-sedimentary faults. Deltas and fan deltas have different characteristics in sand-body thickness because they have different sedimentary subfacies. The proposed geomorphology and sedimentary evolution of the lacustrine depositional system may aid in the prediction of potential reservoir distribution in the Gaoyou Sag.     

Evaluation of the petroleum composition and quality with increasing thermal maturity as simulated by hydrous pyrolysis: A case study using a Brazilian source rock with Type I kerogen

Hydrous pyrolysis (HP) experiments were used to investigate the petroleum composition and quality of petroleum generated from a Brazilian lacustrine source rock containing Type I kerogen with increasing thermal maturity. The tested sample was of Aptian age from the Araripe Basin (NE-Brazil). The temperatures (280–360 °C) and times (12–132 h) employed in the experiments simulated petroleum generation and expulsion (i.e., oil window) prior to secondary gas generation from the cracking of oil. Results show that similar to other oil prone source rocks, kerogen initially decomposes in part to a polar rich bitumen, which decomposes in part to hydrocarbon rich oil. These two overall reactions overlap with one another and have been recognized in oil shale retorting and natural petroleum generation. During bitumen decomposition to oil, some of the bitumen is converted to pyrobitumen, which results in an increase in the apparent kerogen (i.e., insoluble carbon) content with increasing maturation.The petroleum composition and its quality (i.e., API gravity, gas/oil ratio, C₁₅₊ fractions, alkane distribution, and sulfur content) are affected by thermal maturation within the oil window. API gravity, C₁₅₊ fractions and gas/oil ratios generated by HP are similar to those of natural petroleum considered to be sourced from similar Brazilian lacustrine source rocks with Type I kerogen of Lower Cretaceous age. API gravity of the HP expelled oils shows a complex relationship with increasing thermal maturation that is most influenced by the expulsion of asphaltenes. C₁₅₊ fractions (i.e., saturates, aromatics, resins and asphaltenes) show that expelled oils and bitumen are compositionally separate organic phases with no overlap in composition. Gas/oil ratios (GOR) initially decrease from 508–131 m³/m³ during bitumen generation and remain essentially constant (81–84 m³/m³) to the end of oil generation. This constancy in GOR is different from the continuous increase through the oil window observed in anhydrous pyrolysis experiments. Alkane distributions of the HP expelled oils are similar to those of natural crude oils considered to be sourced from similar Brazilian lacustrine source rocks with Type I kerogen of Lower Cretaceous age. Isoprenoid and n-alkane ratios (i.e., pristane/n-C₁₇ and phytane/n-C₁₈) decrease with increasing thermal maturity as observed in natural crude oils. Pristane/phytane ratios remain constant with increasing thermal maturity through the oil window, with ratios being slightly higher in the expelled oils relative to those in the bitumen. Generated hydrocarbon gases are similar to natural gases associated with crude oils considered to be sourced from similar Brazilian lacustrine source rocks with Type I kerogen of Lower Cretaceous, with the exception of elevated ethane contents. The general overall agreement in composition of natural and hydrous pyrolysis petroleum of lacustrine source rocks observed in this study supports the utility of HP to better characterize petroleum systems and the effects of maturation and expulsion on petroleum composition and quality.     

4­‐­甲基甾烷在油源对比中的应用--以渤南洼陷北部陡坡带为例

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Es4s和Es3x两套主力烃源岩,中部次洼、西部次洼和渤南深洼Es3x烃源岩的4 甲基甾烷/C29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C20、C21、C23三环萜烷和ααα20RC27、C28、C29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/C29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Es4s和Es3x油气均为近源成藏,主要来源于其临近次洼的Es3x烃源岩。     

Geochemical characteristics of aromatic hydrocarbons in saline lacustrine crude oils and their significance as exemplified by the south area of western Qaidam Basin

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.     

Origin of Oils in “Subtle pools” in the Dongying Depression, Bohai Bay Basin, China

Subtle traps or oil pools have become an important exploration play in the Dongying Depression, Bohai Bay Basin, east China. Despite recent successes in exploration, the formation mechanisms of subtle traps are still not well understood. The majority of subtle oil pools in the Dongying Depression are developed in the middle interval of the Es3 Member of the Paleogene Shahejie Formation with the subtle traps being primarily of lenticular basin-floor turbidite sands encompassed in mudstones. Oil in the subtle traps was previously thought to have migrated directly from the surrounding source rocks of the same formation （Es3）. Detailed geochemical investigation of 41 oils and 41 rock samples from the depression now indicates that the oils from the subtle traps cannot be correlated well with the surrounding Es3 source rocks, which are characterized by high Pr/ Ph （〉1）, low Gammacerane/C30hopane, representing a freshwater lacustrine setting. In contrast the oils features low Pr/Ph （〈1） and relatively high Gammacerane content, showing a genetic affinity with the underlying Es4 source rocks, which also have the same qualities, indicating a brackish lacustrine setting. Oils in the Es3 subtle traps are probably derived from mixed sources with the contribution from the upper Es4 source rocks predominating. Therefore unconventional oil migration and accumulation mechanisms need to be invoked to explain the pooling of oils from the ES4 source rocks, which probably came through a thick low interval of the Es3 source rocks with no apparent structural or stratigraphic pathways. We suggest that the subtle oil migration pathway probably plays an important role here. This finding may have significant implications for future exploration and the remaining resource evaluation in the Dongying Depression.     

青藏高原北部新生代湖相碳酸盐岩碳氧同位素特征及古环境意义

对青藏高原北部地区新生代陆相地层中湖相碳酸盐岩进行了系统采样分析，以碳氧同位素作为古环境和古气候变化的替代指标,试图从古湖泊演化的角度，阐明高原新生代早期环境演变历史和过程。研究结果表明，该区所有分析样品中生物碎屑灰岩类样品的δ¹⁸O和δ¹³C显示最低值，反映它们沉积在一个水体滞留时间短的开放性淡水湖泊系统中。泥晶灰岩类样品的δ¹⁸O和δ¹³C之间具有正相关关系，表明它们发育在蒸发作用明显的封闭性咸水湖泊体系中，而叠层石灰岩类明显富集13C可能与微生物活动有关。从始新世到渐新世至中新世，湖相碳酸盐岩δ¹⁸O值具有逐渐增大的趋势，δ¹³C则由古近纪的负值变为新近纪的正值，反映该区古湖泊系统经历了一个由开放到封闭的过程，预示古近纪到新近纪之交高原古气候格局发生了重大变革。     

渤中坳陷埕北30潜山储层流体包裹体特征与成藏时间研究

流体包裹体研究表明,渤中坳陷潜山构造CB302井奥陶系储层中流体包裹体丰富,主要发育有盐水包裹体与石油包裹体。与石油包裹体共生的盐水包裹体均一温度有两组,分别为122￣133℃与130￣140℃,结合石油包裹体特征,认为存在两期油气运聚过程。根据埕北30潜山沉积埋藏史、古地温史及成藏地质背景,推导出这两期油气运聚时间分别出现在5～3Ma与3～1.5Ma。第一期油气可能来源于邻近的黄河口凹陷下第三系沙河街组,烃源岩属局部油气充注;第二期油气来源于渤中坳陷斜坡带东营组二段,对埕北30潜山轻质油油气藏的形成起了主要作用。