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1.
A Study on Organic Inclusions in Clastic Reservoir Rocks and Their Application to the Assessment of Oil and Gas Accumulations 总被引：5，自引：0，他引：5
Terrigenous clastic reservoir rocks are widespread in China,and nearly all the industrial oil and gas accumulations in eastern China occur in the clastic rocks.The study shows that organic inclusions are mostly distributed in the secondary fissures and pores which were ormed in the process of oil-rock interaction,rather than in the cements or secondary enlargements. The organic inclusions are dominantly organic gas-rich or are composed of pure hydrocarbons.Homogenization temperatures range mainly from 120℃ to 130℃，which shows a relatively high maturity of organic matter.Vertical and horizontal temperature changes provide the grounds for the investigation of basin evolution and thermal fluid-kinetics-model.Fluorescence spectral characteristics o the organic inclusions indicate that oils and gases in the area studied probably have experienced two-stage or two-time migration.Micro-fluorescence rescearch is one of the effective approaches to oil/source correlation and oil migration-stage determination.The abundance and occurrence of organic inclusions is one of the indicators of oil and gas abundance and accumulation in rock layers.With the help of other informatio,organic inclusions can provide the basis for the prospective assessment of oil and gas in clastic reservoir rocks. 相似文献
2.
碳酸岩分散有机质的基本存在形式、演化特征与碳酸岩地层油气评价 总被引：17，自引：0，他引：17
Two major characters are recognized with respect to the evolution of organic matter during diagenesis of carbonate rocks; (1) expellation of organic matter from carbonate minerals through crystallization, which could reduce the amount of organic matter significantly in the early stage of diagenesis; (2) protection of organic matter by the minerals, especially in the late stage of diagenesis. According to their nature and relations to the protection during diagenesis, three majer forms of disseminated organic matter in carbonate rocks can be distinguished: adsorbed, ctystallization-trapped organic matter and organic inclusions. Owing to the protection by minerals the maturation process of disseminated organic matter proceeds very slowly, and the matority of crystallization-trapped organic matter may play an important role in carbonate source rocks. Most of the organic inclusions are migrated organic matter, such as hydrocarb ons; so organic inclusions may be a good indicator which can be used to study the primary,secondary migration and the concentration of oil and gas in carbonate source rocks and carbonate reservoir strata, 相似文献
3.
WANG Pengpeng HU Yuzhao LIU Lu JIANG Xiaojun LI Chao Chad Joseph Bartholomew ZHANG Guiquan 《《地质学报》英文版》2017,91(6):2153-2163
Abundant organic inclusions are present in the Qinglong antimony deposit. However, the source rocks of these organic matters have not been reliably identified. Recently, a paleo–oil reservoir was found in the Qinglong antimony deposit. In view of similar components of gaseous hydrocarbon, we propose that the organic matters observed in inclusions in Qinglong antimony deposit would come from this paleo–oil reservoir. We used the Re–Os dating method to determine the age of the bitumen from this paleo–oil reservoir, and obtained an isochron age of 254.3±2.8 Ma. The age indicates that the oilgeneration from source rock occurred in the early Late Permian, earlier than the Sb mineralization age(~148±8.5 Ma) in the Qinglong antimony deposit area. After oil generation from Devonian source rock, first and secondary migration, the crude oil have probably entered into the fractures and pores of volcanic rocks and limestone and formed a paleo–oil reservoir in the western wing of Dachang anticline. As burial process deepened, the crude oil has turned into natural gas, migrates into the core of Dachang anticline and formed a paleo–gas reservoir. The hydrocarbons(including CH_4) in the reservoirs can serve as reducing agent to provide the sulfur required for Sb mineralization through thermal chemical reduction of sulfates. Therefore, the formation of oil–gas in the area is a prerequisite for the Sb mineralization in the Qinglong antimony deposit. 相似文献
4.
Compositional heterogeneity of crude oil and its origin in the Linnan subsag, Linyi County, Shandong Province 总被引：1，自引：1，他引：0
The Linnan subsag is the main oil producer of the Linpan oil zone. Based on the oil group composition, gas chromatography data and biomarker analysis, it was indicated that crude oils from different oilfields varied greatly in group composition and showed obvious heterogeneities in the aspects of precursor type, crude oil maturity and hydrocarbon depositional environment. According to the characteristics of source rocks, three oil populations can be distinguished, i.e., the southern, northern and transitional oil populations. Furthermore, on the basis of post-reservoir reworking processes, the medium conditions of hydrocarbon-generating environment and differences in maturity, six oil families and twelve sub-families were distinquished. An integrated study suggested that the factors leading to such heterogeneities in crude oil composition mainly include different source rocks, multi-stage oil/gas charging, geo-chromatographic effects during oil/gas migration, reservoir heterogeneities and various post-reservoir secondary alterations. 相似文献
5.
Exploration potential is huge and the oil resources are rich in the Ordovician reservoirs of the Tarim Basin. However, the mechanism of hydrocarbon accumulation is complex and not yet fully understood. In the Tuoputai area, the hydrocarbon migration pathways and characteristics of deep hydrocarbon accumulation are revealed through analyses of the physical data of rich oil and gas, the geochemical parameters of oil, and fluid inclusions. The results show that the Ordovician oils in the Tuoputai area have the same geochemical characteristics as the mixed oil from the Lower Cambrian source rock and the Middle–Upper Ordovician source rock. The Ordovician reservoirs have been charged three times: in the late Caledonian, late Hercynian, and Himalayan stages. Oil charging occurred in the Hercynian stage, in particular, as it is the main filling period of hydrocarbon. The north-northeast(NNE)-trending TP12 CX major fault, active in in these times and is dominant migration channel of hydrocarbon, but there is segmentation affected by the difference of activities. Oil maturity is higher in the south than in the north and is abnormally high near the major fault. Parameters related to migration indicate that oil migrated northeastward along the NNE-trending TP12 CX major fault and adjusted laterally along the secondary faults and weathering crust, forming the present characteristics of oil and gas distribution. 相似文献
6.
Analysis of Organic Inclusions Using Fluorescence Microscopy and Micro-FT.IR Techniques 总被引：1，自引：0，他引：1
Organic inclusions from the Shahejie Formation of the Eogene period in the Bohai Gulf Basin,eastern China,were examined using micro-FT.IR and fluorescence microscopy in addition to the measurement of their homogenization temperatures(Th).Two populations of organic inclusions were recognized,the primary and the secondary organic inclusions.The primary organic inclusions contain organic materials with relatively long alkyl chains(the carbon atom number is 15 to 17),whereas the secondary organic inclusions contain a certain amount of H2S besides organic materials which have relatively short alkyl chains with the carbon atom number of 5 to 6.The Th values of the primary organic inclusions within the rage of 87-91℃,lower than those of the secondary organic inclusions(Th=98-105℃）,sugesting that the primary organic inclusions experienced a lower degree of thermal evolution than the secondary inclusions.This inference is consistent with the fluorescence spectroscopic characteristics and parameters(Tmax,Q values)of the organic inclusions.Data from the organic inclusions together with the petroleum geology setting revealed that the primary inclusions resulted from the migration of hydrocarbons generated within the strata they are hosted,whereas the secondary organic inclusions were trapped in the process of secondary hydrocarbons expelled out of the source rocks to the locations where they were accumulated.The thermal properties of the organic inclusions are consistent with the maturation of the oil generated from the Shahejie Formation.The abundance of the organic inclusions and their characteristics indicate that the member Es3 of the Shaheije Formation is highly potential for oil accumulation.The results could provide essential coues to petroleum exploration in the Bohai Gulf Basic. 相似文献
7.
Fluid inclusions in minerals filled in pores of reservoir rocks can be used as a good indicator of pore genesis and development so as to shed light on oil generation,migration and accumulation.The relationship between pore evolution and oil generation has been established based on fluid inclusion studies on the Lower Ordovician carbonate reservoir strata in the Ordos Baisn,Northwest China.Seven stages of porosity development can be recogmized.i.e.,the penecontemporaneous,the early and middle-late diagenetic,the supergene,the early,middle and late re-burying stages.The dissolution pores an fissures formed in the supergene and middle-late reburying stage and the structural fractures formed in the late re-burying stage constitute the major traps of oil and gas.The major phase of oil migration and accumulation took place between Late Jurassic and Cretaceous,Corresponding to the middle and late re-burying stages.The generation and accumulation of oil can be closely related to Yenshanian tectonics. 相似文献
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9.
A Study of the Migration and Accumulation Efficiency and the Genesis of Hydrocarbon Natural Gas in the Xujiaweizi Fault Depression 总被引：1，自引：1，他引：0
In order to investigate the migration and accumulation efficiency of hydrocarbon natural gas in the Xujiaweizi fault depression, and to provide new evidence for the classification of its genesis, a source rock pyrolysis experiment in a closed system was designed and carried out. Based on this, kinetic models for describing gas generation from organic matter and carbon isotope fractionation during this process were established, calibrated and then extrapolated to geologic conditions by combining the thermal history data of the Xushen-1 Well. The results indicate that the coal measures in the Xujiaweizi fault depression are typical ＂high-efficiency gas sources＂, the natural gas generated from them has a high migration and accumulation efficiency, and consequently a large-scale natural gas accumulation occurred in the area. The highly/over matured coal measures in the Xujiaweizi fault depression generate coaliferous gas with a high δ^13C1 value （〉 -20‰） at the late stage, making the carbon isotope composition of organic alkane gases abnormally heavy. In addition, the mixing and dissipation through the caprock of natural gas can result in the negative carbon isotope sequence （δ^13C1 〉δ^13C2 〉δ^13C3 〉δ^13C4） of organic alkane gases, and the dissipation can also lead to the abnormally heavy carbon isotope composition of organic alkane gases. As for the discovery of inorganic nonhydrocarbon gas reservoirs, it can only serve as an accessorial evidence rather than a direct evidence that the hydrocarbon gas is inorganic. As a result, it needs stronger evidence to classify the hydrocarbon natural gas in the Xujiaweizi fault depression as inorganic gas. 相似文献
10.
Based on the studies of geological history during the Paleozoic time. depoaitional esvironment, the evolution of organisms, the content of organic substances and the distribution of oil-generatlng strata, various indicators concerning oil generation are discussed and. compared in terms of Organic substance composition, the alkane and isopronoid in saturated hydrocarbon, characteristic functional group of the aromatic hydrocarbon and its structure, element composition and free radical concentration in asphaltene as well as carbon isotopes. The following conclusions can be drawn: (1) During the Later Paleozoic, the mud stone of the two oil-generating depressions of the Ponhsi Group on the western part of the basin was the most important reservoir and the black mud stone and limestone were secondary in importance. (2) Both the Ordovicoan Machiakou limestone and the shale of grapholithic facies are main oil (gas) generating strata in the western part of the basin. The Changhsia Group of the middle Cambrian system may also be oil-generatlng but is of little consequence. (3) Oil and gas formation in the Upper and. Lower Paleozoic groups represent two. different evolutionary stages. In the Upper Paleozoic group the petroleum formed is a kind of light oil, and large quantities of natural gas had been formed from the coal-bearing Taiyuan and Shansi Groups as a result of metamorphism. In response to the action of temperature and. presses over the prolonged geological period, oil sad gas formation in the lower Paleozoie group corresponds to a more advanced evolutionary stage, during which the generation of natural gas is the dominant process in comparation with oil condensation. Therefore the lower Paleozoic group is believed to be more promising for gas prospecting. 相似文献
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四川盆地威远气田碳酸盐岩中有机包裹体研究 总被引：12，自引：3，他引：12
本文通过对威远、资阳地区上震旦统碳酸盐岩储集层中有机包裹体的研究,提出有机包裹体多分布于储层孔洞缝中所充填的三期矿物中,研究区油气运移的主要通道是溶蚀孔洞和裂缝。并根据不同期次充填矿物中有机包裹体特征、均一温度及单个有机包裹体成分,追索了研究区油气热演化程度、油气运移期次、油气运移的深度和温度。研究结果表明,研究区存在三次主要的油气运移和聚集,其各自演化的程度及油气运移的深度和温度皆不同。 相似文献
13.
四川盆地西南部储层有机包裹体组成和碳同位素特征及其对油气来源的指示 总被引：2，自引：1，他引：2
本文对四川盆地西南部气区震旦系灯影组和二叠系茅口组、长兴组碳酸盐岩储层的有机包裹体特征、组成、碳同位素进行了研究，追索了研究区油气的演化、运移及油气的成因。结果表明，在震旦系灯影组和二叠系茅口组、长兴组储层中，皆存在有三期以上的油气运移。不同储层中，相应各期的油气运聚特点及演化程度略有不同，灯影组中各期有机质的成熟度及油气演化程度均略高于二叠系；同储层中，各期油气运聚的特点及演化程度存在明显的差异，可划分为三个阶段：石油成熟阶段、高成熟凝析油一湿气阶段、过成熟干气阶段。研究区灯影组储层的天然气成因为油型气，二叠系的为多成因；各储层中的CO2主要为有机成因气，少量为无机成因气。 相似文献
14.
川西南震旦系储集层有机包裹体在油气运移研究中的应用 总被引：1，自引：0，他引：1
有机包裹体在油气成因、运移和演化研究中具有重要的意义.川西南震旦系灯影组储层中次生成因孔洞缝发育, 经历了多期白云石和硅质充填.对不同期次充填矿物中的有机包裹体特征及荧光进行了观察, 测定了各期盐水包裹体均一温度, 其主峰分布在120~150℃、160~190℃和200~210℃; 并采用真空破碎法对各期有机包裹体的化学成分及碳同位素组成进行了分析, 其化学成分以CH4和CO2为主, 各期中的w(CH4)含量分别为10.09%~22.08%、27.06%~40.40%和55.33%~74.01%, 相应的w(CO2)/w(CH4)值为3.37~5.87, 1.20~2.20和0.26~0.63.CH4和CO2的碳同位素组成分别为(-50.7~-28.4)×10-3和(-18.3~-3.6)×10-3.据此追述了研究区油气的成因性质、油气的演化和运移.结果表明, 研究区震旦系灯影组储层的天然气为油型气; CO2主要为有机成因, 有少量为无机成因; 研究区存在有3期以上的油气运移, 且各期油气演化程度不同. 相似文献
15.
154 core and outcrop samples of Proterozoic and Palaeozoic reservoir and non-reservoir strata were collected from Renqui, Subei, Guangxi, Sichuan, etc. Organic inclusions contained in the samples were studied by means of polarized light microscope, fluorescence microscope, micro-cooling-heating stage and compositional analysis. According to HC phase, colour, refractive index and fluorescent properties, organic inclusions can be classified as two braod types: HC inclusions and HC-containing inclusions, which can be further subdivided into eight subtypes. Also discussed in this paper are the types and peculiarities of organic inclusions, as well as the composition of gases, parameters for organic molecules and paleotemperature, which are considered to be useful indicators for oil and gas migration, evolution and prospective evaluation. Some typical examples are also given in this study. 相似文献
16.
珠三坳陷有机包裹体应用研究 总被引：11，自引：3，他引：8
珠三坳陷由于其多样的烃源条件,多套生储盖组合,使得含油气系统复杂化,为了解我油气分布、运移、聚集和成藏的质规律,本文运用有机包裹体对该区的烃源、油气藏注入史以及油气运聚与断裂发育的关系进行了研究,研究中３采用荧光偏光显微镜、显微冷热台、显微傅立叶变换红外光谱、Ｒｂ－Ｓｒ同位素等多项有机包裹体分析技术,研究结果认为：珠三坳陷琼海凸起上的两其期有机包裹体无论是类型、期次、分布特征、均一温度还是成熟度, 相似文献
17.
大港探区古流体特征及其地质意义 总被引：3，自引：0，他引：3
位于黄骅凹陷的大港探区经历了加里东、海西、印支、燕山和喜山期构造热事件。古流体研究表明 ,本区有两期油气运移过程 ,分别与燕山期和喜山期的构造热事件相对应。两期油气运移过程具有不同的流体包裹体特征记录和明显差异的流体成分和物理化学性质。早期油气运移以形成液态烃有机包裹体为主 ,流体成分中有机组分含量 (质量分数 )偏低 ( 13 5 %～ 3 7 9% ) ,而无机组分含量(质量分数 )偏高 ( 62 0 %～ 85 9% )。晚期油气运移以形成气态烃和气液烃有机包裹体为主 ,流体成分中有机组分含量 (质量分数 )偏高 ( 3 4 6%～ 73 0 % ) ,而无机组分含量 (质量分数 )偏低 ( 2 6 6%～65 2 % )。早晚两期流体的形成温度、压力也具有一定的差异 ,晚期的温度和压力均大于早期。酸碱度和氧化还原电位具有较小差异 ,晚期略小于早期。流体包裹体特征、流体成分和物理化学性质均表明 ,本区具有两期油气运移和演化过程 相似文献
18.
流体包裹体在油气地质地球化学中的应用 总被引：13，自引：3，他引：10
流体包裹体研究是油气形成和成藏定量化研究的重要手段。本文总结了油气藏中流体包裹体的地质地球化学意义及其在石油、天然气研究中的应用,探讨了烃源岩和储层流体包裹体在确定源岩演化、沉积环境、有机母质类型、成熟度、油气运移充填期次等方面的应用,指出目前流体包裹体油气地球化学研究应关注的几个前沿方向：①在流体包裹体分析实验技术中,单个包裹体分析技术在油气地质定量化研究中具有重要的作用;②通过有机包裹体自然剖面与模拟实验对比研究烃类流体运移分馏,为建立油气成藏过程地球化学示踪指标提供基础参数;③通过储层中不同期次有机包裹体的化学组成、同位素组成、生物标志化合物与圈闭中已经聚集成藏的油气地球化学特征的对比研究,确定圈闭中油气的成因、来源和充填过程;④有机包裹体成烃作用研究为碳酸盐岩生烃和深层油气成因理论提供依据;这些方向的研究成果为深化油气理论、提高勘探水平具有重要意义。 相似文献
19.
鄂尔多斯盆地北部直罗组有机质特征及与铀成矿关系 总被引：2，自引：0，他引：2
本文研究了鄂尔多斯盆地典型铀矿床的有机质与铀成矿的关系。探讨了煤屑的赋存状态、煤质特征及成熟度,认为煤屑的演化程度均较低,处于低成熟阶段,有利于对铀的吸附。总体上看煤质有机质和铀矿化关系密切,铀含量与煤屑含量呈正相关关系,对铀矿物为吸附态形式。通过对该区油气包裹体的研究认为,该区存在多期次的成岩方解石胶结过程,并伴随多期次的油气包裹体发育,尤以晚期的胶结方解石矿物中存在丰富的晚期油气包裹体。研究认为晚期可能发生过油、气的运移和聚集,铀矿床的形成与赋矿砂岩中有机流体或还原性气体的充注和络合作用密切相关,因而这些丰富的有机流体和还原性气体对于铀的富集沉淀具有重要意义。 相似文献