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1.
Gao Xiaohui Zhang Xunhua Guo Xingwei Cai Laixing Hou Fanghui Zhu Xiaoqing 《中国海洋大学学报(英文版)》2020,19(3):536-550
Well CSDP-2 is a fully coring deep drilling hole, penetrating the thick Paleozoic marine strata in the South Yellow Sea Basin(SYSB) in the lower Yangtze Block(LYB). Based on the petrological and geochemical analysis of 40 sandstone samples from the core CSDP-2, the provenance and tectonic features of Paleozoic detrital rocks from SYSB are analyzed and systematically delineated in this article. The results show that the Silurian – Carboniferous sandstones are mature sublitharenite, while the Permian sandstones are unstable feldspathic litharenite. The average CIA(chemical index of alteration) is 74.61, which reflects these sediments were derived from source rocks with moderate chemical weathering. The REE(rare earth element) patterns are characterized by LREE enrichment, flat HREE and obviously negative Eu anomaly, which are similar to that of the upper continental crust. Dickinson QFL discrimination results indicate the recycled orogeny provenance. Various diagrams for the discrimination of sedimentary provenance based on major and trace element data show all the sediments were derived predominantly from quartz sedimentary rocks, of which the Permian strata contain more felsic sedimentary rocks. Geochemical data for these detrital rocks suggest they occur at the passive continental margin and island arc settings, and the Permian sandstone presents active continental margin setting. 相似文献
2.
石炭、二叠系是我国主要含煤地层,它广泛分布于鲁西隆起区。该区上石炭统由本溪组和太原组组成,二叠系下统由山西组和下石盒子组组成,二叠系上统由上盒子组组成。石炭系和二叠系划分出五个成矿系列。本溪组成矿系列主要有 G 层铝土矿,其次是山西式铁矿、硬质耐火粘土矿、软质耐火粘土矿和伴生镓元素。太原组成矿系列主要有煤,其次是膨胀粘土矿、陶瓷“大同土”。山西组成矿系列主要有煤,其次是膨胀粘土矿、菱铁矿。石盒子组万山段成矿系列主要有 A 层硬质耐火耐土矿和铝土矿,其次是铝土矿中伴生镓,石盒子组奎山段成矿系列主要有石英砂岩。这些矿床应归属于“滨海相→滨海沼泽相→内陆沼泽相→内陆湖泊相→内陆河湖相的化学→碎屑岩建造沉积成矿系列”。 相似文献
3.
准噶尔盆地南缘东段油气成藏条件及成藏模式 总被引：1，自引：1，他引：0
准噶尔盆地南缘东段是准噶尔盆地油气勘探的重点地区。以成盆、成烃和成藏理论为指导,应用盆地分析、有效烃源岩评价、储层(裂缝)预测、盆地模拟及流体包裹体分析等技术和方法,综合研究分析了准噶尔盆地南缘东段油气成藏条件,预测了油气资源潜力,建立了油气成藏模式。研究结果表明,该区发育上二叠统、中上三叠统和中下侏罗统三套烃源岩。最主要的烃源岩层为上二叠统,是油气资源分布的主要层位;主要储集层为柴窝堡区块的上二叠统和米泉区块的中下三叠统及中下侏罗统,其物性较差,总体为较好含气储层,是主要的勘探目的层。存在自源(侧向排烃)、它源(垂向排烃)两类油气成藏模式。柴窝堡区块北部和米泉区块仍然是有利的油气勘探地区。 相似文献
4.
塔里木盆地顺北地区古生界油气资源非常丰富,此外在中新生界也发现了良好的油气显示,揭示出该区中新生界也具有较好的油气勘探潜力。因此,为了揭示对顺北地区中新生界油气成藏具有关键控制因素的断裂构造特征及其发育机制,通过对顺北地区最新三维地震资料的精细构造解释,系统分析了该区中新生界断裂构造的类型、几何学特征及其成因演化。研究表明：顺北地区中新生界断裂以张性正断层为主,发育少量逆断层和走滑断层,该区断裂发育数量众多但单条断裂规模较小、平面上呈杂乱展布且具有明显的分区分层的差异活动特征。与区域动力背景和盆地演化阶段相统一,顺北地区中新生界断裂演化经历了印支、燕山和喜山期3个阶段多期次伸展-挤压构造旋回,而且该区所处的构造位置、下伏中二叠统火成岩地层特征及下三叠统柯吐尔组砂泥岩塑性层等对中新生界断裂的形成演化具有重要控制作用。通过对顺北地区连通T90～T50界面通源断裂的精细刻画,揭示出在5号断裂带中部和7号断裂带中南部存在两大通源断裂发育区,上述两地区部分断裂由T90 相似文献
5.
There are eighty sedimentary basins in five different types in African continent, i. e. craton sag basin, foreland basin, intermountain basin, passive margin basin and rift basin, which underwent the stress environment of stable depression-compression-extension. The first three types of basins had been intensely influenced by Hercynian and Alpine tectonic movement, while the later two types of basins always exist in a stable extension environment. Different basin evolution caused the obviously hydrocarbon distribution difference. In North Africa, marginal craton sag and rift basins show great expedition potential of hydrocarbon, marginal craton sag basins had good formation and preservation of Lower Silurian hot shale, tectonic-strata traps and migration pathway formed by Hercynian unconformity, and rift basins had excellent Upper Cretaceous marine source rocks and good hydrocarbon preservation with little tectonic activity. Meanwhile, in the salt-containing passive margin basins and delta basins of West Africa, thick strata containing high quality source rocks and plastic strata were well developed. Source rocks of high maturity, good hydrocarbon preservation, growth faults and deformational structure traps were formed by abundant overlying sediments and sources supplied from Tertiary large water system. 相似文献
6.
《中国海洋湖沼学报》2021,(3)
To reconstruct the paleoenvironment, the petrography and geochemical compositions of the upper Permian Dalong Formation(Fm)(P_3d) sandstones in the Central Uplift, South Yellow Sea Basin, was investigated, after which the provenance, tectonic setting, weathering conditions, and diagenetic history were determined. The Dalong Fm is mainly composed of sandstones with a few mudstones and limestones. The petrographic analysis showed that the P_3d sandstones are in low maturity and could be classified into feldspar sandstone and lithic sandstone on average framework composition of Q_(63)F_(16)L _(21). The major and trace element results show that Dalong Fm sandstones are enriched in Rb and depleted in Cr and Ni compared with the upper continental crust(UCC). The chemical weathering intensity is weak to low moderate in the source area as indicated by the chemical index of alteration(CIA) and other results from a variety of methods. The diagenetic process included three main stages: eodiagenesis, mesodiagenesis, and telodiagenesis. Tectonic discrimination plots show that the source areas were an active continental margin(ACM) and a passive continental margin(PCM), which may have been related to the northward movement of the Lower Yangtze Plate(LYP) and the collision between the LYP and the North China Plate(NCP). 相似文献
7.
琼东南盆地的中生代凹陷群是扩大油气勘探发现的远景区。为了实现琼东南盆地中生界的勘探突破,急需落实中生代凹陷的油气成藏条件和有利勘探领域。基于地球物理、地球化学、钻井资料及古生物资料,首次对琼东南盆地中生代凹陷开展了深入系统的分析研究。研究表明,在琼东南盆地北部崖北凹陷、崖城凸起、崖南低凸起和西南部陵南低凸起及南部隆起均存在中生代沉积地层。根据盆地构造演化分析,中生代沉积形成于燕山期太平洋板块向欧亚板块俯冲期以及其后的弧后伸展期,存在烃源岩、储层及圈闭等油气地质基本条件。琼东南盆地北部坳陷带崖城-崖北地区相比盆地其他地区中生代沉积凹陷规模大,因此本研究重点对琼东南盆地北部坳陷带崖城-崖北地区进行了系统的油气地质综合分析研究,落实了崖城-崖北地区中生界沉积地层分布,并初步评价预测了有利油气勘探区带及重点目标。研究表明,琼东南盆地崖城-崖北地区中生代凹陷发育湖相烃源岩、三角洲等储集体以及构造与地层圈闭,存在西洼南坡带和中部隆起带2个有利油气勘探区带。在这些区带加大勘探,有望获得中生界油气突破。 相似文献
8.
Sedimentary basins in the Yellow Sea can be grouped tectonically into the North Yellow Sea Basin (NYSB), the northern basin of the South Yellow Sea (SYSNB) and the southern basin of the South Yellow Sea (SYSSB). The NYSB is connected to Anju Basin to the east. The SYSSB extends to Subei Basin to the west. The acoustic basement of basins in the North Yellow Sea and South Yellow Sea is disparate, having different stratigraphic evolution and oil accumulation features, even though they have been under the same stress regime since the Late Triassic. The acoustic basement of the NYSB features China-Korea Platform crystalline rocks, whereas those in the SYSNB and SYSSB are of the Paleozoic Yangtze Platform sedimentary layers or metamorphic rocks. Since the Late Mesozoic terrestrial strata in the eastern of the NYSB (West Korea Bay Basin) were discovered having industrial hydrocarbon accumulation, the oil potential in the Mesozoic strata in the west depression of the basin could be promising, although the petroleum exploration in the South Yellow Sea has made no break-through yet. New deep reflection data and several drilling wells have indicated the source rock of the Mesozoic in the basins of South Yellow Sea, and the Paleozoic platform marine facies in the SYSSB and Central Rise could be the other hosts of oil or natural gas. The Mesozoic hydrocarbon could be found in the Mesozoic of the foredeep basin in the SYSNB that bears potential hydrocarbon in thick Cretaceous strata, and so does the SYSSB where the same petroleum system exists to that of oil-bearing Subei Basin. 相似文献
9.
Yong Yuan Jianwen Chen Yuxi Zhang Jie Liang Yinguo Zhang Penghui Zhang 《中国海洋大学学报(英文版)》2018,17(5):1075-1090
The South Yellow Sea Basin is the main body of the lower Yangtze area in which marine Mesozoic–Paleozoic strata are widely distributed.The latest geophysical data were used to overcome the limitation of previous poor-quality deep data.Meanwhile,the geological characteristics of hydrocarbon reservoirs in the marine Mesozoic–Paleozoic strata in the South Yellow Sea Basin were analyzed by comparing the source rocks and the reservoir and utilizing drilling and outcrop data.It is believed that the South Yellow Sea Basin roughly underwent six evolutionary stages:plate spreading,plate convergence,stable platform development,foreland basin development,faulted basin development,and depression basin development.The South Yellow Sea Basin has characteristics of a composite platform-fault depression geological structure,with a half-graben geological structure and with a ‘sandwich structure' in the vertical direction.Four sets of hydrocarbon source rocks developed – the upper Permian Longtan–Dalong formation,the lower Permian Qixia formation,the lower Silurian Gaojiabian formation,and the lower Cambrian Hetang formation/Mufushan formation,giving the South Yellow Sea Basin relatively good hydrocarbon potential.The carbonate is the main reservoir rock type in the South Yellow Sea area,and there are four carbonate reservoir types:porous dolomitic,reef-bank,weathered crust,and fractured.There are reservoir-forming horizons similar to the typical hydrocarbon reservoirs in the Yangtze land area developed in the South Yellow Sea,and there are three sets of complete source-reservoir-cap rock assemblages developed in the marine strata,with very good hydrocarbon potential. 相似文献
10.
北山盆地群侏罗系是我国西北地区潜在的油气勘探新领域,为深化其石油地质认识,进一步明确资源潜力,优选北山盆地群中勘探程度相对较高的中口子盆地侏罗系为研究对象,以有机质丰度、类型及成熟度等有机地球化学分析数据为基础,分析了侏罗系烃源岩基础特征,并基于生物标志化合物资料,探讨了该区侏罗系烃源岩的有机质来源及沉积环境。结果表明,中口子盆地侏罗系烃源岩有机质丰度较高,生烃潜力较好,主要为中等-好烃源岩,干酪根类型以Ⅱ2型为主,生烃母质主要是陆源高等植物,主要形成于氧气量适中的弱氧化-弱还原古环境,靠近或位于凹陷中心的烃源岩形成环境还原性稍强,较有利于有机质保存。区内黑帐房凹陷烃源岩已经成熟,而南泉凹陷烃源岩主要为低熟。因此建议黑帐房凹陷中心或者临近中心区域,寻找保存条件好的油藏是取得下步油气勘探突破的重点。这些认识可供西北地区侏罗系沉积古环境和资源潜力研究时对比参考。 相似文献
11.
在探讨高邮凹陷断层发育时期和分布特点的基础上,结合油气分布特点,分析了断层在油气成藏中的作用类型,并探讨了其作用机理。依据断层在油气生成、运移、聚集和分布环节中的作用,把断层分为控源断层、供烃断层、改向断层、成圈断层和调整破坏断层。控源断层控制有效烃源岩展布和生烃时期的早晚,高邮凹陷控源断层下降盘为有效烃源岩分布区,而且西部地区早于东部地区生烃;供烃断层控制油气主运移通道的走势,其陡断面和凸断面为高邮凹陷断裂带油气的主运移通道;改向断层影响油气的富集层位和油气富集区的位置,其对高邮凹陷油气分布的影响存在"分散"和"富集"两种效应;成圈断层控制圈闭的类型及分布;调整破坏断层导致圈闭充满程度和原油物性的改变,高邮凹陷调整破坏断层为盐城期和三垛期活动断层。高邮凹陷断层的多期性和多样性导致断层体系中各断层封闭性在时空上的差异性和多变性,从而形成对油气控制的多面性和复杂性。 相似文献
12.
针对深处青藏高原腹地中低纬度高海拔(4 600~5 300m)永冻土地带的青海乌丽地区,开展了该地区天然气水合物形成的气源条件研究。冻土区地表沿断层发育若干冷泉,野外采集冷泉新鲜水500mL密封送实验室进行气相色谱分析。首先对水中溶解的烃在真空和60℃恒温条件下脱出气体,将脱出气体经ρ(NaOH)=300g/L的碱液吸收CO2,余下气体经碱液驱赶至量气管上端,计量脱出气体的体积,并转移至另处;然后根据溶解烃含量注入适当体积的脱出气体进行色谱标定、单点外标定量。结果在冷泉中检测出CH4体积分数一般在223.60~1 097.30 μL/L之间,最高达1 113.21 μL/L。野外工作查明烃源岩主要为上二叠统那益雄组含煤碎屑岩建造,次为上三叠统巴贡组碎屑岩。前者中赋存的煤层及炭质泥岩为天然气水合物气源供给的重要母质。此研究成果揭示该地区具备形成天然气水合物藏的良好气源条件及成藏潜力。 相似文献
13.
Black shales of the Paleocene Patala Formation are proven source rocks for conventional hydrocarbons in southern Potwar Basin of Pakistan and are assumed to be effective source rocks towards north in the Margalla Hill Range of Pakistan. In this regard, the current study focuses on source rock geochemistry of the Paleocene Patala Formation to assess its source rock potential, organic matter types and thermal maturity levels in the Mar-galla Hill Range of North Pakistan. Source rock generative potential, kerogen types and thermal maturation of the analysed rock samples were unraveled by using Rock-Eval pyrolysis Tmax, TOC (total organic carbon) and vitrinite reflectance ( R0 ) analyses. TOC analysis coupled with S2 yield revealed poor to fair source rock quality encountered within the formation. The pyrolysis Tmax vs Hydrogen Index ( HI) , showed mostly Type Ⅲ kerogen dominated by thermally immature to mature organic matter. The HI and genetic potential is low and revealed poor hydrocarbon generation potential of the formation. The S1 vs TOC plots confirm the indigenous nature of the hydrocarbons hosted by Patala Formation. The vitrinite reflectance outcomes indicated immature to mature source rock beds lying in dry gas zone. The HI and OI signatures and abundance of Type Ⅲ kerogen are indica-ting dominance of terrestrial organic matter within the formation. Overall, the investigated Patala Formation ex-posed at the studied section of Margalla Hill Range, Pakistan acts as a poor source rock unit for liquid hydrocar-bon generation but holds prospects for dry gas generation in the study area. 相似文献
14.
根据最新区域地质调查的代表剖面,在分析研究下二叠统开心岭群、上二叠统乌丽群的岩性组合特征、沉积类型、古生物面貌的基础上,将二叠系建立5个岩石地层单位和相应的5个生物地层单位,代表栖霞期—长兴期地层层序与生物序列;区内生物性质属特提斯动物群和华夏植物群;青南乌丽与藏北双湖及昌都妥坝属同一含煤建造,成煤期为龙潭中期—长兴期。 相似文献
15.
依据化石的层位分布和组成内容，登封二叠纪煤系地层植物群由下而上可划分为三个植物化石组合带：１．早二叠世中期山西组Ｅｍｐｌｅｃｔｏｐｔｅｒｉｓｔｒｉａｎｇｕｌａｒｉｓ－Ｔａｅｎｉｏｐｔｅｒｉｓｍｕｌｔｉｎｅｒｖｉｓａｓ－ｓｅｍｂｌａｇｅｚｏｎｅ；２．早二叠世晚期下石盒子组Ｇｉｇａｎｔｏｐｔｅｒｉｓｎｉｃｏｔｉａｎａｅｆｏｌｉａ－Ｃｈｉｒｏｐｔｅｒｉｓｒｅｎｉｆｏｒｍｉｓａｓｓｅｍｂｌａｇｅｚｏｎｅ；３．晚二叠世早期上石盒子组Ｌｏｂａｔａｎｎｕｌａｒｉａｈｅｉａｎｅｎｓｉｓ－Ｐｔｅｒｏｐｈｙｌｌｕｍｅｒａｔｕｍａｓ－ｓｅｍｂｌａｇｅｚｏｎｅ。另外，文中还讨论了这些植物组合的主要特点 相似文献
16.
Upper Paleozoic Marine Shale Characteristics and Exploration Prospects in the Northwestern Guizhong Depression,South China 总被引：1，自引：0，他引：1
Zhenhong Zhu Genshun Yao Zhanghua Lou Aimin Jin Rong Zhu Chong Jin Chao Chen 《中国海洋大学学报(英文版)》2018,17(4):773-790
Multiple sets of organic-rich shales developed in the Upper Paleozoic of the northwestern Guizhong Depression in South China. However, the exploration of these shales is presently at a relatively immature stage. The Upper Paleozoic shales in the northwestern Guizhong Depression, including the Middle Devonian Luofu shale, the Nabiao shale, and the Lower Carboniferous Yanguan shale, were investigated in this study. Mineral composition analysis, organic matter analysis(including total organic carbon(TOC) content, maceral of kerogen and the vitrinite reflection(Ro)), pore characteristic analysis(including porosity and permeability, pore type identification by SEM, and pore size distribution by nitrogen sorption), methane isothermal sorption test were conducted, and the distribution and thickness of the shales were determined, Then the characteristics of the two target shales were illustrated and compared. The results show that the Upper Paleozoic shales have favorable organic matter conditions(mainly moderate to high TOC content, type Ⅰ and Ⅱ_1 kerogen and high to over maturity), good fracability potential(brittleness index(BI) 40%), multiple pore types, stable distribution and effective thickness, and good methane sorption capacity. Therefore, the Upper Paleozoic shales in the northern Guizhong Depression have good shale gas potential and exploration prospects. Moreover, the average TOC content, average BI, thickness of the organic-rich shale(TOC 2.0 wt%) and the shale gas resources of the Middle Devonian shales are better than those of the Lower Carboniferous shale. The Middle Devonian shales have better shale gas potential and exploration prospects than the Lower Carboniferous shales. 相似文献
17.
鄂尔多斯盆地地层埋藏演化与油气成藏分析 总被引：2，自引：1，他引：1
地层埋藏状况对有机质生烃及油藏保存具有重要的控制作用.通过对鄂尔多斯盆地晚三叠世以来地层埋藏史和有机质热演化生烃史的恢复,对比盆地不同地区之间地层剥蚀和埋藏特点,探讨地层埋藏演化特征对油气成藏的影响,分析地层埋藏对有机质生烃及油藏保存条件的影响.结果表明:在鄂尔多斯盆地晚三叠世以来经历的4期(T3、J1、J2、K1)沉降—抬升循环演化过程中,不同地区的沉积埋藏深度和埋藏速率存在明显差异.一方面导致各地区间长7烃源岩进入生烃的时间提前或滞后.北部古峰庄地区和中部白豹地区在J2期已进入早期生烃,姬塬和镇北地区在J3期进入早期生烃,而南部西峰、洛川地区和东部陕北地区早期生烃的时间是K1早中期.进入大量生烃阶段的时间基本都在K1期.另一方面导致地区间成藏封存条件的变化.在北部和中南部地区,地层埋藏深度大,沉积速率高,形成很好的封闭条件.各生烃阶段,特别是早期生成油气也可很好地保存而成藏. 相似文献
18.
通过对储层成岩作用、流体包裹体岩相学和孔隙沥青特征的分析,在烃包裹体期次划分的基础上,结合流体包裹体均一温度特征、烃源岩热演化史、地层埋藏史和储层成岩史,确定了鄂尔多斯盆地中部延长组下组合油气充注期次。结果表明:鄂尔多斯盆地中部延长组长8段和长9段致密储层主要发育压实、胶结、交代和溶解4种成岩作用,自生矿物主要为绿泥石、石英胶结物、长石胶结物和方解石胶结物。根据包裹体宿主矿物形成序列,识别出3期烃包裹体。第一期烃包裹体分布在石英愈合缝、石英次生加大边和充填孔隙的石英胶结物中,少数低成熟的黄色荧光烃包裹体及黑色荧光沥青包裹体代表了烃源岩进入生烃门限后排出的少量烃类充注,多数成熟度较高的蓝色、蓝白色荧光烃包裹体代表了生烃高峰期大量烃类充注;第二期烃包裹体分布在长石胶结物中,数量较少,显示蓝色和蓝白色荧光,在溶蚀孔隙周围或沿解理分布,呈短柱状,边界平直;第三期烃包裹体分布在方解石胶结物中,呈孤立或零星分布,形状近六边形;后两期烃包裹体均是在烃类充注结束后捕获孔隙中烃类形成的。研究区延长组长8段和长9段经历了晚侏罗世末期至早白垩世末期的一期烃类持续充注。 相似文献
19.
鄂尔多斯盆地中部上古生界沉积相演化 总被引：9，自引：1，他引：8
张晓莉 《地球科学与环境学报》2005,27(3):26-29,37
利用钻井资料和地质资料对鄂尔多斯盆地上古生界沉积相演化进行详细的研究。分析了本溪期（海侵）、太原期（海侵扩大）、山西期（海退）、石盒子期（海陆交互）和石千峰期（陆缘湖泊）等5个时期的古地理环境、岩石类型、沉积相类型和平面展布特征。得出这5个时期在盆地内构成了一个海侵海退旋回，形成了从滨浅海相到海陆过渡的三角洲相、河流湖泊相陆源沉积。控制生成了三角洲相分流河道砂砾岩、水下分流河道砂砾岩以及潮坪相砂坝等有利储集岩带，潮坪相发育的煤系地层为烃源岩。上石盒子组洪泛平原形成泥质岩盖层。生油岩和储集岩叠置或互侧式组合关系，形成本区受砂体分布控制的岩性气藏。 相似文献
20.
深水油气勘探是近些年油气勘探取得重大发现的主要领域,我国已在琼东南盆地深水区中央峡谷体系中发现并成功开发了首个深水大气田——陵水17-2气田。为进一步扩大油气勘探成果,急需阐明中央峡谷源头区沉积特征及其油气勘探前景。基于在多口钻井约束下覆盖整个研究区的三维地震资料综合解释建立的等时地层格架,系统总结了中央峡谷体系的形成演化过程,及各演化阶段中央峡谷源头区的沉积体系类型、空间展布和沉积模式,进而结合研究区天然气成藏条件和成藏模式分析,讨论了中央峡谷源头区油气勘探前景。研究结果表明,中央峡谷源头区在黄流组发育了深水水道、陆架边缘三角洲和水道化扇等沉积体系,来源于印支地块、红河和海南岛等多物源区的沉积体系总体以重力流方式呈汇聚型向盆地深水区搬运,并最终汇聚于中央峡谷体系内。在中央峡谷源头区沉积的轴向水道、陆坡水道和水道化扇内发育了优质储层,因此,来自深部的天然气在具有以泥-流体底辟构造作为天然气输导通道的区域,有望聚集形成大型整装天然气藏。该研究成果不但丰富和完善了中央峡谷沉积体系的认识,而且对南海北部深水油气勘探具有重要实际价值。 相似文献