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1.
The Tazhong reef-flat oil-gas field is the first large-scale Ordovician organic reef type oil-gas field found in China.Its organic reefs were developed in the early Late Ordovician Lianglitag Formation, and are the first large reefs of the coral-stromatoporoid hermatypic community found in China.The organic reefs and platform-margin grain banks constitute a reef-fiat complex, mainly consisting of biolithites and grainstones.The biolithites can be classified into the framestone, bafflestone.bindstone etc.The main body of the complex lies around the wells from Tazhong-24 to Tazhong-82, trending northwest, with the thickness from 100 to 300 m, length about 220 km and width 5-10 km.It is a reef-flat lithologic hydrocarbon reservoir, with a very complex hydrocarbon distribution:being a gas condensate reservoir as a whole with local oil reservoirs.The hydrocarbon distribution is controlled by the reef complex.generally located in the upper 100-200 m part of the complex,and largely in a banded shape along the complex.On the profile,the reservoir shows a stratified feature.with an altitude difierence of almost 2200 m from southeast to northwest.The petroleum accumulation is controlled by karst reservoir beds and the northeast strike-slip fault belt. The total geologic reserves had reached 297.667 Mt by 2007. 相似文献
2.
塔里木盆地塔中北部斜坡带奥陶系海相碳酸盐岩油气勘探取得了重大突破,发现了台缘坡折带礁滩复合体大型凝析气藏和台内岩溶风化壳大型油气藏。利用有机地化指标与构造沉积演化紧密结合对有效烃源岩及成藏过程的研究取得了较好成果,但随着勘探的纵深发展,流体分布复杂的问题日趋突出,通过天然气组分以及相关同位素等分析化验数据,进行塔中北部斜坡带奥陶系油气成藏研究,建立了"三期成藏、两期调整,早期成油、晚期注气,复式聚集、普遍含油"成藏模式,明确了塔中天然气以原油裂解气为主,强调晚期气侵是形成塔中大型天然气田的关键。 相似文献
3.
塔中Ⅰ号坡折带奥陶系礁滩复合体发育动力学及其控储机制 总被引：2，自引：1，他引：1
塔中Ⅰ号坡折带上奥陶统良里塔格组发现了我国珊瑚-层孔虫造礁群落最早的礁体,在生态演替上具承先启后重要特征,并伴随着发育了多套礁滩相储集体。充分利用古地理、古地磁,同位素、微量元素,包裹体,岩心物性分析等数据,分析了塔里木板块奥陶纪成礁环境,特别是从构造地质学、碳酸盐岩地质学、层序地层学、古生态学、古生物学出发,剖析了塔中隆起碳酸盐岩台地演化的阶段性、海平面变化的周期性,以及奥陶纪造礁生物生态群落的演替及生物生长性,分别建立了良里塔格组各个时期礁滩复合体发育的模式,深入解析了礁滩复合体多期生长发育的动力学特征。塔中良里塔格组3期叠加发育的礁体生长与台地演化的构造阶段性密切相关,同时控制了礁滩复合体微相类型上的多样性和分异性。礁滩复合体地貌隆起和高频海平面变化所导致的暴露,以及准同生期大气淡水淋滤、溶蚀作用是控制台缘礁滩体优质储层发育的动力学基础,经后期埋藏过程中所经历的表生岩溶作用、埋藏期热水岩溶作用以及断层相关岩溶等是该礁滩复合体储层物性改良主控因素。集中揭示了塔中奥陶纪礁滩复合体发育演替几何学、动力学机制及礁滩储集体控储机制,有效指导了塔中古隆起奥陶系生物礁油气规模效益开发,对于类似油气田勘探与学科发展具有积极意义。 相似文献
4.
礁滩体储层是中国目前碳酸盐岩勘探的重点。塔里木盆地奥陶系礁滩复合储集体发育,中奥陶统生物礁发育层位主要在一间房组,发育区集中分布在塔北、巴楚等地,并以开阔台地台内点礁方式出现。HD23井区内共有奥陶系探井4口,其中HD17井、HD13井、YW2井在中奥陶统一间房组都钻遇了托盘类瓶筐石（Calathium）障积礁,礁的厚度约5 m,礁的上下地层均为砂屑鲕粒灰岩和砂砾屑灰岩等滩相沉积,形成礁滩复合体。文中通过钻井资料和地球物理资料,深入研究了HD23井区礁滩体的特征与分布。三维地震解释显示一间房组地层中存在一个厚度异常体,经分析认为该异常体就是局部异常发育的瓶筐石生物礁滩复合体,该生物礁滩体横向连片,有一定的分布范围和规模。对该井区内中奥陶统一间房组的生物礁滩体加以研究,将为下一步奥陶系的油气勘探提供依据。 相似文献
5.
中国低丰度大型岩性油气田形成条件和分布规律 总被引：17，自引：2，他引：15
我国低丰度岩性油气田具有很大的资源潜力和储量规模,在中、古生代地层均有广泛的分布,具备良好的油气地质背景和成藏条件,是未来油气勘探的重点领域,其形成条件及富集规律不明.本文在大量统计分析和地质研究的基础上,探讨了低丰度大油气田的形成条件、分布特征、富集规律和未来的勘探领域.研究指出了低丰度大型岩性油气田形成的几个地质背景:大面积高丰度烃源岩;平缓的构造格局;稳定的沉积背景;大规模的沉积体系;建设性成岩环境.系统分析了油气田形成控制因素和分布规律:1陆相(或海陆交互相)大型三角洲平原—前缘主河道砂体、海相高能相带(台缘礁滩、滨岸砂体)是大型岩性油气藏的有利分布区;2次生溶蚀相、白云岩化相、风化淋滤相、绿泥石薄膜胶结相和TSR相等建设性成岩作用是优质储层及大油气田分布的有利区;3古地形(古隆起、斜坡、起伏带、鼻隆等)、断裂(层/褶/坡/陷/块)带、构造反转带、裂缝发育带和地层剥蚀尖灭带是大型油气田形成的有利构造条件和富集地区;4低丰度大型岩性油气田的分布和富集普遍受控于构造、沉积和成岩三因素控制的“甜点”.研究成果可为寻找油气勘探的后备领域和储量接替提供理论基础和科学依据. 相似文献
6.
首次在刘家场地区早奥陶世Tremadocian早期地层（南津关组下部）中发现Pelmatozoan生物礁, Pelmatozoan不仅单独形成障积礁,而且和低等微生物菌藻类一起联合形成微生物岩礁--障积礁和粘结礁。障积礁可分为Pelmatozoan障积礁和有柄棘皮类包壳状蓝细菌粘结障积礁,粘结礁可分为硅化海绵有柄棘皮类蓝细菌障积粘结礁和有柄棘皮类蓝细菌障积粘结礁。相应地,可以划分为4个生物群落,即Pelmatozoan群落、有柄棘皮类包壳状蓝细菌群落、硅化海绵有柄棘皮类蓝细菌群落和有柄棘皮类蓝细菌群落。在对研究区Pelmatozoan与叠层石纹层破坏的关系讨论中,笔者认为Pelmatozoan障积作用而阻断部分纹层的生长可能是主要原因,Pelmatozoan滤食可能是次要原因。生物礁发现表明,有柄棘皮动物在全球最早建礁的时间是Tremadocian早期,更重要的是该发现提供了中寒武世古杯点礁衰亡之后后生动物第一次恢复造礁的证据。因此,Tremadocian早期Pelmatozoan生物礁的发现不仅对于有柄棘皮动物生物礁和奥陶纪生物礁的演化史研究具有重要理论意义,而且对江汉平原油气评价等经济领域具有一定的实际意义。 相似文献
7.
Reef-controlled mineral deposits in southern China are divided into three types in this paper based on the relative importance of organic reefs in the ore-forming processes; they are: the direct type, indirect type, and passive type. The case histories of several typical deposits are discussed. In studying reef-controlled deposits, more attention should be paid to the function of synsedimentary faults in reef construction and mineralization and the importance of oil-gas palaeoreservoirs in reef rocks for the formation of sulfide deposits, in addition to analysing the favourable sedimentary facies of mineralization. 相似文献
8.
近期轮南奥陶系沉积储层研究取得了几个方面的重要进展:发现了两期三套风化壳岩溶储集系统,其中海西期一套,存在于奥陶系顶部,加里东期两套,存在于奥陶系内部;确定了轮古东奥陶系储集层为风化壳岩溶缝洞性储层;发现了桑塔木组礁滩相储集层。桑塔木组沉积早期轮南地区具有成礁环境,局部发育有小型生物礁;修正了以往对奥陶系沉积相的划分,将奥陶系碳酸盐台地边缘的位置东移30km;提出了奥陶系内部风化壳储层形成的热沉降机制,认为晚奥陶世早期塔里木盆地存在一次热升降运动,该运动使轮南地区发生不均衡抬升,奥陶系良里塔格组出露剥蚀,形成轮南地区广泛分布的风化壳岩溶储集系统,从而揭示了轮南地区奥陶系更为良好的勘探前景。 相似文献
9.
LEE Jeong-Hyun HONG Jongsun WOO Jusun OH Jae-Ryong LEE Dong-Jin CHOH Suk-Joo 《《地质学报》英文版》2016,90(1):352-367
Various early Paleozoic (Cambrian Series 3–Middle Ordovician) reefs are found in the Taebaek Group, eastern Korea, located in the eastern margin of the Sino-Korean Block. They occur in every carbonate-dominant lithostratigraphic unit of the group, but their morphology and composition differ markedly. The Daegi Formation (middle Cambrian: Cambrian Series 3) contains siliceous sponge-Epiphyton reefs formed in a shallow subtidal environment, which is one of the earliest metazoan-bearing microbial reefs after the archaeocyath extinction. The Hwajeol Formation (upper Cambrian: Furongian) encloses sporadic dendrolites consisting of Angulocellularia, which developed in a relatively deep subtidal environment, representing a rare deeper water example. The onset of the Ordovician radiation resulted in the formation of microbialite–Archaeoscyphia–calathiid patch reefs in shallow subtidal deposits of the Lower Ordovician Dumugol Formation. Subsequent late Early Ordovician relative sea-level fall established extensive peritidal environments, forming microbial mats and stromatolites of the Lower–Middle Ordovician Makgol Formation. Ensuing Ordovician radiation resulted in one of the earliest metazoan skeletal reefs of the Middle Ordovician Duwibong Formation, constructed by stromatoporoid Cystostroma and bryozoan Nicholsonella, and developed around shallow shoals. These reefs reflect ongoing evolution and sea-level change during the early Paleozoic, and exemplify a rare glimpse of peri-Gondwanan records of reef evolution, which warrant detailed investigations and comparison with their counterparts in other regions. 相似文献
10.
河北柳江盆地中晚寒武世藻类丘礁的演化 总被引：5，自引：0，他引：5
河北柳江盆地中晚寒武世藻类丘礁十分发育，并形成完好纵向演化序列。藻礁具有两个演化方向，其一是骨骼钙藻Ｅｐｉｐｈｙｔｏｎ向非骨骼蓝绿藻方向演化；其二是块状藻丘向厚层状叠层石礁方向演化。藻类丘礁的演化特征及其沉积相序揭示了该区中晚寒武世时从碳酸盐台地边缘斜坡至台缘浅滩和潮坪环境的演化历史。 相似文献
11.
Combination Patterns and Depositional Characteristics of Ordovician Carbonate Banks in the Western Tarim Basin,China 总被引：2，自引：0，他引：2
HU Xiaolan FAN Tailiang GAO Zhiqian YU Bingsong CHEN Xiaozhi WANG Hongyu WANG Jianping LI Rangbin DING Meng and LI Yifan 《《地质学报》英文版》2012,86(4):894-911
The combination patterns and depositional characteristics of the carbonate banks are investigated based on outcrop sections, thin sections, and carbon isotopes of Ordovician in the western Tarim Basin, China. Four carbonate bank combination patterns are deposited in the Ordovician, western Tarim Basin, including: Reef-Bank Complex (RBC), Algae-Reef-Bank Interbed (ARBI), Thick-Layer Cake Aggradation Bank (TLCAB), and Thin-Layer Cake Retrogradation Bank (TLCRB). All combination patterns show clear periods vertically. The RBC is mainly composed of reefs and bioclastic banks, and the dimension of the RBC depends on the scale of the reefs. Bioclastic banks deposits surround the reefs. The range of the ARBI is determined by the scale of algae-reefs, algae peloid dolomite microfacies and algal dolomite microfacies deposit alternating vertically. TLCAB and TLCRB are deposited as layer-cakes stacking in cycles and extending widely with cross bedding developed. The grains of TLCAB and TLCRB are diverse and multi-source. With the impacting of relative sea level change, biological development and geomorphology, the ARBI, TLCAB or TLCRB, RBC are successively developed from the Lower Ordovician Penglaiba Formation to the Middle Ordovician Yijianfang Formation. The depositional environment analysis of Ordovician indicates that the RBC and ARBI can form effective oil and gas reservoirs, and the TLCAB and TLCRB have the potential to form the huge scale oil and gas reservoirs and to be the crucial targets of exploration for the Ordovician carbonate banks in the future. 相似文献
12.
13.
塔里木盆地轮南低凸起断裂系统与复式油气聚集 总被引：18，自引：7，他引：18
塔里木盆地轮南低凸起复式油气聚集区的提出对高效指导轮南地区的油气勘探起了促进作用。基于区域石油地质研究成果,充分利用成像测井、高分辨三维地震断裂精细描述和有机地球化学等新技术新方法,本文系统研究了轮南低凸起复式油气聚集成藏的关键地质条件,全面刻画了轮南断裂系统的复杂特征,明确了轮南多含油层系具有相同的寒武系海相烃源,证实了在多期次成藏过程中,断裂系统既是早期成藏的油气充注通道,又是晚期调整气侵的输导体系。对轮南海相碳酸盐岩大型油气田的成藏,断裂系统既是有效的储集空间,又是储集性能改善和连通性增强的重要条件,提出复杂断裂系统多期活动下油气渐进幕式成藏和跨越动态成藏模式。从前提(古隆起)、基础(多套储盖组合)和关键(断裂系统)3方面探讨了复式油气聚集成藏的机理,并指出轮古东走滑断裂带是近期扩大轮南复式油气聚集区规模、实施天然气勘探的现实领域。 相似文献
14.
鄂尔多斯盆地西缘奥陶纪生物礁基本特征、分布规律及成礁模式 总被引：2，自引：2，他引：0
鄂尔多斯盆地西缘奥陶纪发育有生物礁。本文通过对鄂尔多斯盆地西缘野外及钻井岩心生物礁调查及室内鉴定分析,认为在乌海桌子山地区、棋探1井地区、彭阳石节子沟等地发育了较为典型的生物礁,主要造礁生物为珊瑚、层孔虫和海绵。三处生物礁发育特征有差异,北段礁体生长发育2～3期,中段发育2期生长,南段生长发育可达4期;北端及南端生物礁造礁生物个体较大,生长的水体环境相对较浅,而中段生物礁造礁生物个体较小,生长的水体相对较深。这些典型生物礁的生长、发展和消亡呈现了不同的发育特征和时空分布规律,北段生物礁体发育层位早,中、南段发育层位晚,这种分布变化规律与华北板块在早古生代处于赤道附近发生了北漂右旋的旋转漂移规律有关。通过对不同地段生物礁基本特征分析,结合δ13C和δ18O同位素分析结果,认为盆地西缘生物礁成礁模式为中央古隆起西部陆缘海背景下的开阔台地边缘带点礁-滩体组合模式,分布较为局限,认为该地区生物礁死亡原因系海平面快速上升事件导致礁体被淹死所致,也进一步推测生物礁之上存在一次海平面快速上升事件。 相似文献
15.
首次发现峡东下奥陶统生物礁。造礁生物为攀苔藓虫、托盘藻、古钵海绵、蓝细菌和Pulchrilamina等。按造礁生物形成的格架类型有:粘结粒泥岩,藻粘结岩,攀苔藓虫障积岩,粘结障积岩等4种礁岩微相。这些微相在礁核中有、无和分布差异形成了灰泥岩隆礁,藻岩隆礁,攀苔藓虫障积岩隆礁和藻粘结-古钵海绵障积岩隆礁。各类礁都经历了奠基、发育、衰亡3个阶段。这一演化过程反映了沉积环境和水能量强度对礁发育的制约作用。 相似文献
16.
轮南奥陶系碳酸盐岩古潜山形成于晚加里东-海西期,经过多期构造运动的改造,形成了现今的构造格局;经过了多期成藏过程,形成了现今复杂的油气水分布特征.轮南奥陶系古潜山油气主要分布在潜山围斜部位,潜山面以下约150 m范围内,原油分布不受局部构造影响.总体看来,轮南奥陶系古潜山油气分布主要与储集空间的分布、水动力作用和差异聚集作用有关;轮南奥陶系古潜山油水界面是倾斜的,油气藏具有一定的水动力特征,可能是一个大型的水动力圈闭油气藏. 相似文献
17.
The Early Ordovician System is composed mainly of a series of carbonate platform deposits interbedded with shale and is especially characterized by a large number of organic reefs or buildups that occur widely in the research area. The reefs have different thicknesses ranging from 0.5 m to 11.5 m and lengths varying from 1 m to 130 m. The reef-building organisms include Archaeoscyphia, Recepthaculitids, Batostoma, Cyanobacteria and Pulchrilamina. Through the research of characteristics of the reef-bearing strata of the Early Ordovician in the Yichang area, four sorts of biofacies are recognized, which are (1) shelly biofacies: containing Tritoechia-Pelmatozans community and Tritoechia-Pomatotrema community; (2) reef biofacies: including the Batostoma, Calathium-Archaeoscyphia, Pelmatozoa-Batostoma, Archeoscyphia and Calathium-Cyanobacteria communities; (3) standing-water biofacies: including the Acanthograptus-Dendrogptus and Yichangopora communities; and (4) allochthonous biofacies: containing Nanorthis-Psilocephlina taphocoense community. The analysis of sea-level changes indicates that there are four cycles of sea-level changes during the period when reef-bearing strata were formed in this area, and the development of reefs is obviously controlled by the velocity of sea-level changes and the growth of accommodation space. The authors hold that reefs were mostly formed in the high sea level periods. Because of the development of several subordinate cycles during the sea-level rising, the reefs are characterized by great quantity, wide distribution, thin thickness and small scale, which are similar to that of Juassic reefs in northern Tibet. The research on the evolution of communities shows that succession and replacement are the main forms. The former is favorable to the development of reefs and the latter indicates the disappearance of reefs. 相似文献
18.
塔里木盆地奥陶系生物礁露头的地球物理特征 总被引：8，自引：0，他引：8
奥陶系生物礁为塔里木盆地重要的储集层,明确露头上生物礁的内部结构及发育规模,探索露头和井下生物礁对比研究的新手段有重要意义。应用探地雷达及自然伽马能谱仪对塔里木盆地巴楚达吾孜塔格奥陶系露头进行了探测。研究表明,探地雷达剖面上多数生物礁为扁平透镜状或层状,这与露头上观察的结果有所差别;高分辨率雷达剖面揭示出较出露生物礁发育程度更大、个体更小的疙瘩状礁体或礁团块;礁体内部的分层性及礁体内部水道充填体的斜层理在雷达剖面上反映明显,雷达分辨率可达到分米级别。礁灰岩的自然伽马值高于亮晶砂、砾屑灰岩,而低于泥晶灰岩、棘屑灰岩、泥晶生屑灰岩、泥灰岩的放射性。生物礁在自然伽马曲线上表现为漏斗形、钟形或箱形;自然伽马曲线也反映出礁体内部的分层性。露头和轮南井下奥陶系生物礁的自然伽马放射性特征有一定的相似性,这为露头和井下生物礁的对比研究提供了有力的辅助手段. 相似文献
19.
根据对塔里木西南坳陷可能的烃源岩有机地球化学的分析、评价及已知油气藏和重要油气显示点的油(气)岩的对比结果,该区存在着6套现实的烃源岩(1)下寒武统暗色泥岩及碳酸盐岩;(2)奥陶系的碳酸盐岩和暗色泥岩;(3)石炭系碳酸盐岩和暗色泥页岩;(4)下二叠统暗色泥页岩(5)中下侏罗统的暗色泥岩;(6)上白垩-古近系的碳酸盐岩及暗色泥岩.这几套烃源岩除白垩-古近系有待落实外,其它各套烃源岩均已形成油气显示或工业油气流.综合评价结果最为有利的含油气系统是寒武系,其次为石炭系,根据2个含油气系统的地理分布看,前者主要分布于巴楚隆起及麦盖提斜坡上倾部,后者主要分布于山前坳陷. 相似文献
20.
华南奥陶纪生物礁主要分布于三个层位 ,选择了数个生物礁实例分析当时的古地理格局对礁相地层时空分布的控制作用。涉及到的生物礁赋存层位自下而上为 :特马道克晚期扬子地台中部宜昌分乡组和同时代的扬子地台南缘皖南的仑山组 ;阿伦尼克早期分布于地台中部至南缘的红花园组 ;阿什吉尔中期浙赣边区下镇组和三衢山组。研究结果表明 ,礁相地层的的发育与否及其生物和沉积结构在时空上表现出的分异 ,明显受控于与古地理背景的变迁相关的诸多因素 ,如海平面升降、碳酸盐岩台地的规模以及沉积区间的抬升等 相似文献