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1.
Diagenesis and Their Succession of Gas-bearing and Non-gas-bearing Reservoirs in the Sulige Gas Field of Ordos Basin, China 总被引：1，自引：1，他引：0
Abstract: Comparisons have been made among lithology, diagenesis, and reservoir characteristics of gas-bearing and non-gas-bearing ones in the Sulige gas field of the Ordos Basin based on the laboratory analysis of thin sections, scanning electron microscope, and liquid inclusion of the reservoirs. The reservoirs of the Sulige gas field are now in the middle stage of diagenesis and have undergone compaction, cementation and dissolution. The secondary pore of the reservoir originated from the dissolution of the feldspar and tuff because of the organic acid action from the source rocks during the diagenetic middle stage. Gas-bearing reservoirs are common in soluble pore diagenetic facies of coarse detritus quartzose sandstone, whereas non-gas-bearing ones are common in tense compaction diagenetic facies of mud-bearing medium-fine detritus quartzose sandstone and residual intergranular pore diagenetic facies of mud-bearing medium-coarse detritus quartzose sandstone. The secondary pore is developed in gas-bearing reservoirs of the Sulige gas-field as the medium-coarse grain reservoirs formed in a powerful sedimentary environment and experienced strong dissolution. However, the sediments of fine grain size form the non-gas-bearing reservoirs because of less residual primary pore and secondary pore. 相似文献
2.
Crustal Structural and Tectonic Evolution and Oil Prospect Evaluation in the Songpan-Zoigê Block 
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下载免费PDF全文 MA Yongsheng FU Xiaoyue WU Jingsheng CHEN Gao South Exploration Development Company Sinope Guanshang Kunming Yunnan Tongji University Siping Ro Shanghai China University of Geosciences Lumo Ro Wuhan Hubei 《《地质学报》英文版》2007,81(1):55-60
1 Introduction The Songpan-Zoigê Block (SRB) lies in the east of the Qinghai-Tibet Plateau. It is a triangle block confined and surrounded by three structure belts: the east Kunlun-west Qinling belt (EK-WQLB) to the north, the Sichuan Basin to the southeast and the Garzê-Litang-Jinsha River belt to the southwest. This block is also the joint part of three tectonic domains: the North China, South China and Qinghai-Tibet domains (Huang and Chen, 1987). The development and evolutio… 相似文献
3.
LIN Wen 《《地质学报》英文版》2016,90(5):1887-1902
As a milestone of the entire energy industry, unconventional resources have inevitably swept the world in the last decade, and will certainly dominate the global oil and gas industry in the near future. Eventually, the “unconventional” will become “conventional”. Along with the rapid development, however, some issues have emerged, which are closely related to the viability of unconventional resources development. Under the current circumstances of low crude oil and gas price, coupled with the prominent environmental concerns, the arguments about the development and production of unconventional resources have been recently heated up. This work introduced the full-blown aspects of unconventional resources especially shale reservoirs, by discussing their concepts and definitions, reviewing the shale gas and shale oil development history and necessity, analyzing the shale plays’ geology and petroleum systems with respects to key hydrocarbon accumulation elements and mechanisms, and summarizing the technology resolution. This study also discussed the relevant key issues, including significant estimation uncertainty of technically recoverable resources, the equivocal understanding of complex geology preventing the production and technologies implementation optimization, the difficulties of experiences and technologies global expanding, and the corresponding risks and uncertainties. In addition, based on the latest production and exploration data, the future perspective of the unconventional resources was depicted from global unconventional resources assessments, technology development, and limitations constraining the development. 相似文献
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5.
Re-Examination of the Oil and Gas Origins in the Kekeya Gas Condensate Field, Northwest China–A Case Study of Hydrocarbon-Source Correlation Using Sophisticated Geochemical Methods 下载免费PDF全文
下载免费PDF全文 This work discussed the origins, alteration and accumulation processes of the oil and gas in the Kekeya gas condensate field based on molecular compositions, stable carbon isotopes, light hydrocarbons, diamondoid hydrocarbons and biomarker fingerprints. A comparison study is also made between the geochemical characteristics of the Kekeya hydrocarbons and typical marine and terrigenous hydrocarbons of the Tarim Basin. Natural gas from the Kekeya gas condensate field is derived from Middle–Lower Jurassic coal measures while the condensates are derived from Carboniferous–Permian marine source rocks with a higher maturity. In the study area, both natural gas and condensates have experienced severe water washing. A large amount of methane was dissolved into the water, resulting in a decrease in the dryness coefficient. Water washing also makes the carbon isotopic compositions of the natural gas more negative and partially reverse. Considering that the gas maturities are higher than once expected, gas generation intensity in the study area should be much stronger and the gas related to the Jurassic coal measures could promise a greater prospecting potential. As a result of evaporative fractionation, the Kekeya condensates are enriched in saturates and lack aromatics. Evaporative fractionation disguises the original terrigenous characteristics of the light hydrocarbons associated with the natural gas, making it appear marinesourced. Thus, alteration processes should be fully taken into consideration when gas–source correlations are carried out based on light hydrocarbons. With the condensates discovered in the study area all being "migration phase", the pre-salt Cretaceous and Jurassic reservoirs may promise great exploration potential for the "residual phase" hydrocarbons. This research not only is of significance for oil and gas exploration in the southwest Tarim Basin, but also sheds light on the oil/gas-source correlations in general. 相似文献
6.
The age-accumulation effect of 40Ar in hydrocarbon source rocks was discussed in accordance with the decay law of radioactive elements. In terms of the mean values of 40Ar/36Ar, the old Sinian gas reservoirs (mean values of 40Ar/36Ar: 7009) were definitely distinguished from the Permian gas reservoirs (mean values of 40Ar/36Ar: 1017) in Weiyuan, Sichuan Province, and the gas source of the Permian gas reservoir (mean values of 40Ar/36Ar: 5222) in well Wei-7 with the Weiyuan structure is defined as the Sinian system. Based on the values of 40Ar/36Ar, the coal-type gases (The source rocks are of the C-P system; mean values of 40Ar/36Ar: 1125) are definitely distinguished from the oil-type gases (The source rocks are of the Tertiary system; mean values of 40Ar/36Ar: 590) in the Tertiary reservoirs of the Zhongyuan Oilfield. Besides, 40Ar/36Ar values also have a positive effect on the oil-source correlation of oil reservoirs in ancient hidden mountains. According to the crust-mantle interchange information reflected by 3He/4He values, petroliferous provinces in China can be divided into three major tectonic regions. (1) The eastern active region: The crust-mantle volatile matter exchanges actively, and the 3He/4He values are mainly around 10-6, partly around 10-7. (2) The central stable region: The 3He/4He values are all around 10-8. (3) The western sub-stable region: The 3He/4He values are mainly around 10-8, and around 10-7 on the edges of the basins. Helium contents of some gas wells in China’s eastern petroliferous region reach the industrial abundance (He≈0.05%–0.1%), the 3He/4He values reach 10-6, and the equivalent values for the mantle-source components in helium gas can reach 30%–50%. As viewed from this, a new type of crust-mantle composite helium resources has been proposed. Geneses of some CO2 gas reservoirs in the east of China and some issues concerning mantle-source methane were discussed in the light of the helium and carbon isotopes of CO2 and CH4 in natural gases. In the discussion on helium isotopic characteristics of inclusions in the reservoirs, it was discovered that the 3He/4He values are close to those in natural gases. That is to say, this phenomenon is related to regional tectonism. The 3He/4He, CO2/3He and CH4/3He data were used to discuss the tectonic activities of fault zones in a certain number of regions in China. 相似文献
7.
Origin and Accumulation of Natural Gases in the Upper Paleozoic Strata of the Ordos Basin in Central China 总被引：2，自引：2，他引：0
The natural gases in the Upper Paleozoic strata of the Ordos basin are characterized by relatively heavy C isotope of gaseous alkanes with δ 13C1 and δ13C2 values ranging mainly from ?35‰ to ?30‰ and ?27‰ to ?22‰, respectively, high δ13C excursions (round 10) between ethane and methane and predominant methane in hydrocarbon gases with most C1/(C1-C5) ratios in excess of 0.95, suggesting an origin of coal-derived gas. The gases exhibit different carbon isotopic profiles for C1-C4 alkanes with those of the natural gases found in the Lower Paleozoic of this basin, and believed to be originated from Carboniferous-Permian coal measures. The occurrence of regionally pervasive gas accumulation is distinct in the gently southward-dipping Shanbei slope of the central basin. It is noted that molecular and isotopic composition changes of the gases in various gas reservoirs are associated with the thermal maturities of gas source rocks. The abundances and δ13C values of methane generally decline northwards and from the basin center to its margins, and the effects of hydrocarbon migration on compositional modification seem insignificant. However, C isotopes of autogenetic calcites in the vertical and lateral section of reservoirs show a regular variation, and are as a whole depleted upwards and towards basin margins. Combination with gas maturity gradient, the analysis could be considered to be a useful tool for gas migration. 相似文献
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Accumulation Mechanisms and Evolution History of the Giant Puguang Gas Field, Sichuan Basin, China 总被引：3，自引：2，他引：1
HAO Fang GUO Tonglou DU Chunguo ZOU Huayao CAI Xunyu ZHU Yangming LI Pingping WANG Chunwu ZHANG Yuanchun 《《地质学报》英文版》2009,83(1):136-145
Solid bitumens were found throughout the carbonate reservoirs in the Puguang gas field, the largest gas field so far found in marine carbonates in China, confirming that the Puguang gas field evolved from a paleo-oil reservoir. The fluid conduit system at the time of intensive oil accumulation in the field was reconstructed, and petroleum migration pathways were modeled using a 3-D model and traced by geochemical parameters. The forward modeling and inversion tracing coincided with each other and both indicated that oils accumulated in the Puguang-Dongyuezhai structure originated from a generative kitchen to the northwest of the Puguang gas field. The deposition of organic-rich Upper Permian source rocks dominated by sapropelic organic matter in the Northeast Sichuan Basin, the development of fluid conduit system that was vertically near-source rock and laterally near-generative kitchen, and the focusing of oils originated from a large area of the generative kitchen, were the three requirements for the formation of the giant paleo-oil reservoir from which the giant Puguang gas field evolved. The Puguang gas field had experienced a three-stage evolution. The post-accumulation processes, especially the organic-inorganic interaction in the hydrocarbon-water-rock system, had not only profoundly altered the composition and characteristics of the petroleum fluids, but also obviously changed the physicochemical conditions in the reservoir and resulted in complicated precipitation and solution of carbonate minerals. 相似文献
9.
Abstract: Based on the technology of balanced cross-section and physical simulation experiments associated with natural gas geochemical characteristic analyses, core and thin section observations, it has been proven that the Puguang gas reservoir has experienced two periods of diagenesis and restructuring since the Late Indo-Chinese epoch. One is the fluid transfer controlled by the tectonic movement and the other is geochemical reconstruction controlled by thermochemical sulfate reduction (TSR). The middle Yanshan epoch was the main period that the Puguang gas reservoir experienced the geochemical reaction of TSR. TSR can recreate the fluid in the gas reservoir, which makes the gas drying index higher and carbon isotope heavier because C2+ (ethane and heavy hydrocarbon) and 12C (carbon 12 isotope) is first consumed relative to CH4 and 13C? (carbon 13 isotope). However, the reciprocity between fluid regarding TSR (hydrocarbon, sulfureted hydrogen (H2S)?, and water) and reservoir rock results in reservoir rock erosion and anhydrite alteration, which increases porosity in reservoir, thereby improving the petrophysical properties. Superimposed by later tectonic movement, the fluid in Puguang reservoir has twice experienced adjustment, one in the late Yanshan epoch to the early Himalayan epoch and the other time in late Himalayan epoch, after which Puguang gas reservoir is finally developed. 相似文献
10.
Types, Characteristics and Significances of Migrating Pathways of Gas-bearing Fluids in the Shenhu Area, Northern Continental Slope of the South China Sea 总被引：2，自引：0，他引：2 下载免费PDF全文
下载免费PDF全文 SU Ming SHA Zhibin ZHANG Cuimei WANG Hongbin WU Nengyou YANG Rui LIANG Jinqiang QIAO Shaohu CONG Xiaorong LIU Jie 《《地质学报》英文版》2017,91(1):219-231
11.
近年来发现黔南地区下石炭统打屋坝组发育厚度较大的黑色页岩层,该地层已经成为黔南地区重要的页岩气目标地层。为进一步了解该地层的页岩气参数,评价其页岩气勘探潜力,对代页1井打屋坝组黑色页岩进行观察和取样分析,显示该井打屋坝组黑色页岩钻厚为80 m,总体为一套深水陆棚相沉积;干酪根显微组分以腐泥组、壳质组和镜质组为主,Ⅰ型—Ⅲ型干酪根均有发育,有机碳(TOC)含量主要分布在1.5%~3.3%之间,镜质体反射率(Ro)为2.15%~2.66%;矿物组成以石英、黏土矿物为主,脆性矿物(不含方解石)含量在35%~64%之间;含气量在0.49~4.97 m~3/t之间,平均为2.20 m~3/t。通过露头剖面观察,显示黔南下石炭统打屋坝组黑色页岩厚度均较大,代页1井含气量较高,有机地化、储集物性参数较好,反映打屋坝组具有良好的勘探前景,可进一步加强该地层的基础地质、页岩储层改造和页岩气富集规律研究工作。 相似文献
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贵州南部是我国南方上古生界石炭系页岩集中发育的部位,经历了复杂的构造演化及岩相古地理变化,发育了非均质性较强的打屋坝组页岩层系。紫云地区作为贵州南部的典型代表,不同部位打屋坝组页岩的发育情况都不尽相同。通过对紫云地区长页1井、代页1井及周边罗岗、蛮场、四大寨、格凸河等典型露头开展测试分析,从区域构造发育、地层岩性组合、地层厚度与埋深、有机地球化学特征、页岩储层物性及含气性等角度对区内打屋坝组的分布情况及成藏条件进行了分析。研究认为: 紫云地区在石炭纪早期属台地边缘斜坡-台盆相沉积,水体由北向南逐渐变深,富有机质页岩集中在打屋坝组一段和三段,且各层的各项静态指标有利,区内钻井页岩气含气显示良好。通过综合对比评价,在紫云地区优选了宗地、上院2个页岩气有利区,为下一步页岩气勘探指明了方向。 相似文献
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Geological Features and Reservoiring Mode of Shale Gas Reservoirs in Longmaxi Formation of the Jiaoshiba Area 总被引：2，自引：0，他引：2
Abstract: This study is based on the sedimentation conditions, organic geochemistry, storage spaces, physical properties, lithology and gas content of the shale gas reservoirs in Longmaxi Formation of the Jiaoshiba area and the gas accumulation mode is summarized and then compared with that in northern America. The shale gas reservoirs in the Longmaxi Formation in Jiaoshiba have good geological conditions, great thickness of quality shales, high organic content, high gas content, good physical properties, suitable depth, good preservation conditions and good reservoir types. The quality shales at the bottom of the deep shelf are the main target interval for shale gas exploration and development. Shale gas in the Longmaxi Formation has undergone three main reservoiring stages: the early stage of hydrocarbon generation and compaction when shale gas reservoirs were first formed; the middle stage of deep burial and large-scale hydrocarbon generation, which caused the enrichment of reservoirs with shale gas; the late stage of uplift, erosion and fracture development when shale gas reservoirs were finally formed. 相似文献
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为评价湖南保靖地区震旦系陡山沱组页岩气勘探潜力,利用野外地质调查及页岩气井勘探成果资料,结合钻井岩心样品测试结果,研究了湖南保靖地区陡山沱组页岩储层发育的特征及其分布规律。湖南保靖震旦系陡山沱组发育被动大陆边缘浅水陆棚斜坡相灰色白云质灰岩、黑色碳质泥岩、黑色硅质岩、黑色硅质岩、深灰色泥晶灰岩、深灰色含钙碳质泥岩等。该页岩层分布稳定,厚度巨大(150～200m);有机碳含量较高(4.07%～10.25%),热演化程度较高(3.78%～4.97%),达到过成熟阶段;页岩孔隙度中等(0.19%～2.355%),渗透率极低(0.0005257～0.5910081 mD);脆性矿物含量较高(55.9%～84.5%),主要以石英、方解石、黄铁矿、斜长石为主;黏土矿物含量较低(16.5%～44.1%),以伊利石和伊蒙混层为主,经历了晚成岩作用阶段;储集空间主要有矿物溶蚀孔、有机质溶蚀孔、黄铁矿晶间孔、黏土矿物晶间孔、成岩解理缝及构造微裂缝等。综合研究分析认为,湖南保靖地区陡山沱组具有较好的页岩气成藏条件,可继续加大勘探力度。 相似文献
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从野外地表露头、井下岩心及典型剖面等基础资料出发,以富有机质页岩形成地质背景及其展布特征-页岩气成藏条件-有利区预测为主线,对重庆及周缘地区下古生界页岩气成藏条件进行分析,并采用综合信息叠合法对该区有利区进行预测。指出研究区下寒武统筇竹寺组和上奥陶统五峰组—下志留统龙马溪组两套富有机质页岩普遍发育,分布广,厚度大,埋藏适中,有机质类型好,有机质含量高,具有充足的储集空间和运移通道,并且等温吸附模拟和现场解析实验也表明,这两套页岩均具有较强的气体吸附、较好的含气性能;多口井钻遇黑色页岩段气显异常普遍,也为页岩气的存在提供证据。总之,该区与美国东部典型页岩气盆地有诸多地质可比性,具有形成页岩气藏的有利地质条件,是页岩气勘探研究值得关注的重要领域。 相似文献
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【研究目的】浙西南—赣东北地区寒武系荷塘组广泛发育暗色泥页岩,是下扬子地区页岩气调查的重点层位。目前该区勘探程度低,导致对该区页岩气成藏条件认识不清。【研究方法】通过寒武系荷塘组暗色泥页岩发育的地质背景、有机地球化学参数以及野外调查等方面研究,对该区页岩气资源潜力进行了评价,对有利区进行了优选。【研究结果】浙西南—赣东北地区寒武系荷塘组炭质硅质页岩在研究区内分布广泛,沉积厚度达35~200 m,其中在开化—常山—玉山地区的平均厚度超过50 m;有机质丰度高（1.48%～23.53%）,镜质体反射率适中（2.01%～3.0%）,有机质处于成熟—过成熟阶段。研究区荷塘组地层发育微孔隙、微裂缝等孔隙类型,储集性能较好。等温吸附实验测得炭质硅质页岩吸附气含量平均为5.93 kg/t,表明荷塘组炭质硅质页岩具有较好的吸附能力,有一定的吸附性。【结论】以在高热演化程度环境中找热演化程度较低的区域和在复杂的构造背景中寻找相对稳定的区域为准则,研究认为开化—常山—玉山地区寒武系荷塘组炭质硅质页岩分布厚度适中,有机质丰度高,成熟度相对较低,页岩气保存地质条件较好。创新点：浙西南—赣东北地区寒武系荷塘组页岩具备页岩气富集的物质基础;热演化程度是下扬子地区寒武系荷塘组页岩气能否富集的关键。 相似文献
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中国南方古生界有利暗色页岩发育,但现页岩气勘探取得突破较少,主要原因是南方地质条件复杂,尤其是南方暗色页岩与碳酸盐岩间互发育,页岩气勘探开发面临复杂的碳酸盐岩地质问题。文章从国外勘探经验及近年来南方地区页岩气勘探实践中总结并详细分析了碳酸盐岩发育对页岩气成藏和开发控制的5大问题:（1）地表或近地表岩溶地质问题对开采的影响;（2）页岩目的层顶底板及其内部碳酸盐岩层对成藏和开采的影响;（3）页岩中碳酸盐类矿物含量对开采压裂的影响;（4）页岩层中天然裂缝被方解石充填对成藏的影响问题;（5）常规碳酸盐岩储层与非常规页岩共同成藏问题。建议在南方古生界开展页岩气勘探开发中,把碳酸盐岩本身储集成藏和碳酸盐岩对页岩气成藏、开采、钻井施工等的影响综合考虑,以总含油气系统的思路,综合选井,以促进南方古生界页岩气的勘探开发。 相似文献
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采用有机地球化学分析测试、X衍射荧光分析、高压压汞、扫描电镜、低温氮气吸附等方法,对三江盆地下白垩统穆棱组暗色泥页岩页岩气成藏地质条件开展系统研究,研究结果表明穆棱组暗色泥页岩分布面积较广泛、累积厚度大、TOC含量中等,有机质主要处于成熟-过熟阶段,以Ⅱ2型干酪根为主,说明有机质已进入大量产气阶段;泥页岩中石英、长石及碳酸盐等脆性矿物含量较高;存在一定量的中孔、大孔和微裂缝,为低孔隙度、低渗透率的孔隙结构类型。据现有钻探资料,充分显示了下白垩穆棱组统暗色泥页岩较好的含气性,与美国主要页岩油气产区和中国发现的陆相页岩气层段相对比,三江盆地穆棱组各项参数达标,具有较好的页岩气勘探潜力。 相似文献
19.
The main geological factors controlling the accumulation and yield of marine-facies shale gas reservoirs are the focus of the current shale gas exploration and development research. In this study, the Wufeng-Longmaxi Formation in the Dingshan area of southeast Sichuan was investigated. Shale cores underwent laboratory testing, which included the evaluation of total organic carbon(TOC), vitrinite reflectance(Ro), whole-rock X-ray diffraction(XRD), pore permeability,and imaging through field emission scanning electron microscopy(FE-SEM). Based on the results of natural gamma ray spectrum logging, conventional logging, imaging logging, and seismic coherence properties, the exploration and development potential of shale gas in the Dingshan area have been discussed comprehensively. The results showed that(1)layer No. 4(WF2-LM4) of the Wufeng-Longmaxi Formation has a Th/U ratio 2 and a Th/K ratio of 3.5–12. Graptolites and pyrite are relatively abundant in the shale core, indicating sub-high-energy and low-energy marine-facies anoxic reducing environments.(2) The organic matter is mainly I-type kerogen with a small amount of II1-type kerogen. There is a good correlation among TOC, Ro, gas content, and brittle minerals; the fracturing property(brittleness) is 57.3%. Organic and inorganic pores are moderately developed. A higher pressure coefficient is correlated with the increase in porosity and the decrease in permeability.(3) The DY1 well of the shale gas reservoir was affected by natural defects and important latestage double destructive effects, and it is poorly preserved. The DY2 well is located far from the Qiyueshan Fault. Large faults are absent, and upward fractures in the Longmaxi Formation are poorly developed. The well is affected by low tectonic deformation intensity, and it is well preserved.(4) The Dingshan area is located at the junction of the two sedimentary centers of Jiaoshiba and Changning. The thickness of the high-quality shale interval(WF2-LM4) is relatively small, which may be an important reason for the unstable production of shale gas thus far. Based on the systematic analysis of the geological factors controlling high-yield shale gas enrichment in the Dingshan area, and the comparative analysis with the surrounding typical exploration areas, the geological understanding of marine shale gas enrichment in southern China has been improved. Therefore, this study can provide a useful reference for shale gas exploration and further development. 相似文献
20.
研究区位于滇黔北坳陷威信凹陷的中西部区域——川南低陡褶皱带南缘带,本文利用钻井、野外露头、区域地质等资料,对研究区龙马溪组页岩气基本地质特征进行了分析,并采用体积法对页岩气资源量进行了评价。研究成果表明,区内龙马溪组下段暗色页岩有机质含量及成熟度较高,有机质类型偏腐泥型;岩石脆性矿物含量高,物性一般,总含气量中等,总体与长宁、威远等邻区同层位产气页岩较为相似,并与北美主要产气页岩具有一定可比性。初步估算研究区龙马溪组页岩气资源量24871.8×10~8m~3,展现出良好的勘探前景,但受储层发育、保存条件等影响,页岩气资源分布严重不均,纵向上质量较好的页岩气资源主要集中在龙马溪组底部第1小层,平面上主要分布于研究区北部的川南低陡褶皱带内,该区内保存条件好的宽缓复向斜带和箱状背斜构造带是下步勘探的有利区。 相似文献