共查询到20条相似文献，搜索用时 15 毫秒
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CONTRAST STUDY OF OIL AND GAS EXPLORATION POTENTIAL FOR QIANGTANG, CHANGDOU AND WEST YUNNAN BASIN DURING JURASSIC 相似文献
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羌塘盆地是青藏高原最大的含油气盆地,也是中国潜在的石油战略后备区之一。新的油气地质调查发现,盆地内发育优质古生代烃源岩,主要为石炭系、二叠系的暗色泥岩,具有机碳含量高的特征,机质类型主要为Ⅱ2-Ⅲ型,Ro值大多为1.50%~2.40%,处于高成熟-过成熟阶段。前那底岗日组的古风化壳是盆地内新发现的潜在的储集层,其覆盖于二叠系以及前人已确定的三叠系肖茶卡组地层之上。新发现的上侏罗统-下白垩世白龙冰河组泥灰岩夹膏盐、页岩是区域上较好的盖层。盆地内近年来在地表发现油气显示250余处,其中最重要的是发现了现代天然气泄漏的泥火山,并采集到了天然气样品。综合考虑沉积相、烃源岩、储集层、盖层、保存条件等因素,优选了6个有利区块,其中,托纳木和半岛湖区块作为潜力目标区进行了勘探。 相似文献
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TECTONIC CHARACTERISTICS AND EVOLUTION OF THE QIANGTANG BASIN IN NORTHERN TIBET PLATEAU 相似文献
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ANISOTROPIC FEATURE OF QIANGTANG MASSIF TEXTURE 总被引：2，自引：1，他引：1
ANISOTROPIC FEATURE OF QIANGTANG MASSIF TEXTURE 相似文献
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藏北南羌塘盆地毕洛错地区下侏罗统曲色组石膏岩层 总被引：1，自引：0，他引：1
对西藏自治区北部南羌塘盆地毕洛错地区下侏罗统曲色组石膏岩层进行了研究。根据岩石地层和生物地层资料,确认毕洛错地区的石膏岩层和油页岩为曲色组的一部分,地质时代为早侏罗世,并确认下侏罗统曲色组在区域上可能是寻找油气、油页岩资源的重要层位之一。 相似文献
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PETROLEUM GEOLOGICAL CONDITIONS IN QIANGTANG BASIN 相似文献
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羌塘盆地位于青藏高原腹地,是我国陆上面积最大、勘探程度最低的油气勘探新区,长期以来,由于缺乏油气科学钻探井的验证,对盆地油气地质条件认识不清。最近,中国地质调查局成都地质调查中心在北羌塘中北部的半岛湖地区组织实施了第一口深达4696.18米的油气科学钻探井—羌科1井,本文对该科探井的油气地质成果进行了报道。钻遇了从上侏罗统至上三叠统的连续地层,其中下-中侏罗统雀莫错组与下伏上三叠统那底岗日组地层为整合接触,沉积环境为三角洲-局限台地环境。羌科1井在雀莫错组中首次钻遇了烃源岩,并发现13层气测异常,其中,3层为重要含气层,此外还识别出两套重要的区域性盖层和一套直接封盖层。这些成果表明半岛湖地区油气保存条件较好,是盆地油气勘探的有利地区。 相似文献
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THE BALANCED CROSS-SECTION AND SHORTENING IN QIANGTANG TERRAIN QINGHAI—TIBET PLATEAU 总被引：1，自引：0，他引：1
THE BALANCED CROSS-SECTION AND SHORTENING IN QIANGTANG TERRAIN QINGHAI—TIBET PLATEAU 相似文献
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穹窿构造在北羌塘盆地普遍发育,成为该地区一种重要褶皱样式,其形成机制主要是燕山Ⅲ幕近南北向背斜与前期近东西向背斜的复合叠加。作者进一步指出,穹窿构造是北羌塘盆地最重要的圈闭构造,在油气有利地带近东西向大中型背斜中寻找穹窿构造是确定油气勘探靶区的重要途径。 相似文献
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Shi He Wang Chengshan Ma Runze Wang Hongfeng Li Xianghui Yin Haisheng Wu RuizhongWT ”BX 《地学前缘》2000,(Z1)
THE FINDINGS OF THE UPPER PERMIAN IN THE CUOQIN BASIN, TIBET 相似文献
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吐哈盆地台北凹陷侏罗系油气富集地质条件及油气分布规律 总被引：4，自引：0，他引：4
分析了吐哈盆地台北凹陷侏罗系油气富集地质条件,探讨了其油气分布规律,指出了今后油气勘探的方向。4套2类良好的油源、多套储集性能良好的砂体、有效的圈闭、2套封盖性能极好的区域性盖层及优越的生储盖组合配置是油气富集的基本地质条件;构造、构造—岩性复合是主要的油气藏类型;环主力生油凹陷、沿短轴分布的砂体与燕山期的古构造及喜山期改造加强的构造叠置、多期活动的油源断裂控制油气是油气分布聚集的规律;中部凹陷区的深挖细找,山前褶断带、火焰山背斜带及逆冲断裂上下盘构造,是今后油气勘探的方向。 相似文献
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柴达木盆地北缘地区的新生代构造主要为一系列断层转折褶皱、断层传播褶皱。在邻近祁连山山前的北东背斜带中主要发育规模相对较小、隆升幅度较低的断层传播褶皱和与之相伴产出的突破断层,开始形成于古新世上新世早期;中部背斜带中发育的构造主要为断层转折褶皱和少量断层传播褶皱,开始形成于中新世上新世中期;远离山前的南西背斜带主要发育断层转折褶皱和少量滑脱褶皱,开始于上新世晚期更新世。研究区的台阶状逆断层及其相关褶皱是由祁连山山前向盆地按照一定的序次、以背驮式渐次扩展的,这个扩展过程自古新世一直持续到现在。 相似文献
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BASIN-RANGE TRANSITION AND GENETIC TYPES OF SEQUENCE BOUNDARY OF THE QIANGTANG BASIN IN NORTHERN TIBET 相似文献
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THE CRUSTAL STRUCTURE OF NORTHEASTERN TIBET: A RESULT OF RECEIVER FUNCTION ANALYSIS FOR TELESEISMIC P WAVEFORM 相似文献
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藏北低速体存在的地震学证据——INDEPTH4宽频地震结果 总被引：1，自引：0，他引：1
位于青藏高原东北部的INDEPTH-IV地震探测剖面,始于柴达木盆地南缘,穿越东昆仑造山带、金沙江缝合线,终止于羌塘地体.本文作者利用天然地震体波完成了该区的三维走时残差反演,勾划出了青藏高原东北部的深部构造格局.研究区最显著的现象则是分布在昆仑地体、可可西里地体、羌塘地体北部下地壳、上地幔中的低速体.对其成因,有可能... 相似文献
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《China Geology》2023,6(2):187-207
The Qiangtang Basin of the Tibetan Plateau, located in the eastern Tethys tectonic domain, is the largest new marine petroliferous region for exploration in China. The scientific drilling project consisting primarily of well QK-1 and its supporting shallow boreholes for geological surveys (also referred to as the Project) completed in recent years contributes to a series of new discoveries and insights into the oil and gas preservation conditions and source rock evaluation of the Qiangtang Basin. These findings differ from previous views that the Qiangtang Basin has poor oil and gas preservation conditions and lacks high-quality source rocks. As revealed by well QK-1 and its supporting shallow boreholes in the Project, the Qiangtang Basin hosts two sets of high-quality regional seals, namely an anhydrite layer in the Quemo Co Formation and the gypsum-bearing mudstones in the Xiali Formation. Moreover, the Qiangtang Basin has favorable oil and gas preservation conditions, as verified by the comprehensive study of the sealing capacity of seals, basin structure, tectonic uplift, magmatic activity, and groundwater motion. Furthermore, the shallow boreholes have also revealed that the Qiangtang Basin has high-quality hydrocarbon source rocks in the Upper Triassic Bagong Formation, which are thick and widely distributed according to the geological and geophysical data. In addition, the petroleum geological conditions, such as the type, abundance, and thermal evolution of organic matter, indicate that the Qiangtang Basin has great hydrocarbon-generating potential.©2023 China Geology Editorial Office. 相似文献
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YU Yuanjiang ZOU Caineng DONG Dazhong WANG Shejiao LI Jianzhong YANG Hu LI Denghu LI Xinjing WANG Yuman HUANG Jinliang 《《地质学报》英文版》2014,88(2):598-619
The presence of shale gas has been confirmed in almost every marine shale distribution area in North America.Formation conditions of shale gas in China are the most favorable for marine,organic-rich shale as well.But there has been little research focusing on shale gas in Qiangtang Basin,Qinghai-Tibet Plateau,where a lot of Mesozoic marine shale formations developed.Based on the survey results of petroleum geology and comprehensive test analysis data for Qinghai-Tibet Plateau,for the first time,this paper discusses characteristics of sedimentary development,thickness distribution,geochemistry,reservoir and burial depth of organic-rich shale,and geological conditions for shale gas formation in Qiangtang Basin.There are four sets of marine shale strata in Qiangtang Basin including Upper Triassic Xiaochaka Formation （T3x）,Middle Jurassic Buqu Formation （J2b）,Xiali Formation （J2x） and Upper Jurassic Suowa Formation （J3s）,the sedimentary types of which are mainly bathyal-basin facies,open platform-platform margin slope facies,lagoon and tidal-fiat facies,as well as delta facies.By comparing it with the indicators of gas shale in the main U.S.basins,it was found that the four marine shale formations in Qiangtang Basin constitute a multi-layer distribution of organic-rich shale,featuring a high degree of thickness and low abundance of organic matter,high thermal evolution maturity,many kinds of brittle minerals,an equivalent content of quartz and clay minerals,a high content of feldspar and low porosity,which provide basic conditions for an accumulation of shale gas resources.Xiaochaka Formation shale is widely distributed,with big thickness and the best gas generating indicators.It is the main gas source layer.Xiali Formation shale is of intermediate thickness and coverage area,with relatively good gas generating indicators and moderate gas formation potential.Buqu Formation shale and Suowa Formation shale are of relatively large thickness,and covering a small area,with poor gas generating indicators,and limited gas formation potential.The shale gas geological resources and technically recoverable resources were estimated by using geologic analogy method,and the prospective areas and potentially favorable areas for Mesozoic marine shale gas in Qiangtang Basin are forecast and analyzed.It is relatively favorable in a tectonic setting and indication of oil and gas,shale maturity,sedimentary thickness and gypsum-salt beds,and in terms of mineral association for shale gas accumulation.But the challenge lies in overcoming the harsh natural conditions which contributes to great difficulties in ground engineering and exploration,and high exploration costs. 相似文献
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大龙口地区位于新疆博格达山与准噶尔盆地的结合部位,属于博格达山北缘山前冲断带的组成部分,关于该区地下地质构造特征,长期以来缺乏清楚的认识。通过地表地质、地震和非地震资料的综合研究,纵向上以阜康逆冲断裂为界,将该区划分为下盘伸展构造系统和上盘逆冲推覆构造系统,前者为原地系统,构造变形较弱,保留有早二叠世裂谷的隆坳结构,对重新认识博格达山地区早二叠世的区域大地构造背景及演化具有重要意义;后者构造变形强烈,总体以自南向北的冲断推覆为主,并伴有一定的走滑扭动变形。经过多期构造运动,阜康断裂上盘勘探目的层已裸露,加之褶皱和断裂发育,油气保存条件差,勘探前景较差;而断裂下盘发育早二叠世残留凹陷,圈闭发育,油气保存条件好,勘探前景较好。 相似文献