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1.
Marine carbonate reservoirs, as a focus of petroleum exploration and development in China, are involved with high exploration risk and prediction difficulty owing to high heterogeneity and diversity of reservoir beds. In the Tarim Basin, NW China, carbonate reservoirs host about 38% of the whole basin's hydrocarbon resources in a large prospecting area mainly distributed in the Cambrian and Ordovician rocks in central (Tazhong) and northern (Tabei) Tarim. Recently, a better understanding has been made of the karsted weathering crust at the top of the Lower Ordovician Yingshan Formation in the northern slope area of the Tazhong Low Rise, Central Uplift, Tarim Basin. As a new frontier of exploration, oil/gas distribution and controlling factors of carbonate reservoirs in the Yingshan Formation are not clearly understood. In this work, we investigated the reservoir beds and oil/gas properties in 13 wells in Well block ZG‐43 on the No. 10 structural belt in the Tazhong Low Rise, and studied hydrocarbon accumulation characteristics with seismic and geochemical data. The Yingshan Formation in Well block ZG‐43 is mainly composed of calcarenite, dolomitic limestone, dolomite, cryptite, as low porosity and low permeability reservoir beds, with fracture‐void porosity constituting the main reservoir pore space. Oil/gas is quasi‐layer distributed beneath the unconformity between the Yingshan and Lianglitag formations to a depth of 140 m. The oil in Well block ZG‐43 is condensate with low density, low viscosity, low sulphur, low resin, low asphaltene, and high wax. The gas is 87.3% methane, generally containing H2S. The oil/gas distribution pattern is oil in the east and gas in the west, and H2S content in the west is lower than that in the east. The controlling factors for hydrocarbon are multi‐source supply and multi‐phase charging, interstratal karstification, hydrothermal activity, structural location and sealing condition. A structural–lithological trap is the main type of oil/gas accumulation. Oil/gas distribution was clearly affected by strike–slip faults. Oil/gas with multi‐source supply and multi‐phase charging was controlled by favourable local palaeo‐highs, and affected by later karsting and hydrothermal activity, as well as gas invasion in the Himalayan (Cenozoic) period. Under the caprock of compact limestone in the third to fifth members of the Lianglitag Formation, oil/gas migrated up along the strike–slip fault planes, and moved laterally to both sides in a ‘T’ shape, and formed large‐scale quasi‐layer condensate gas reservoirs controlled by reservoir bed quality. Copyright © 2013 John Wiley & Sons, Ltd. 相似文献
2.
LI Qiming WU Guanghui PANG Xiongqi PAN Wenqin LUO Chunshu Wang Chenglin LI Xinsheng ZHOU Bo 《《地质学报》英文版》2010,84(5):1180-1194
<正>Based on comprehensive analysis of reservoir-forming conditions,the diversity of reservoir and the difference of multistage hydrocarbon charge are the key factors for the carbonate hydrocarbon accumulation of the Ordovician in the Tarim Basin.Undergone four major deposition-tectonic cycles, the Ordovician carbonate formed a stable structural framework with huge uplifts,in which are developed reservoirs of the reef-bank type and unconformity type,and resulted in multistage hydrocarbon charge and accumulation during the Caledonian,Late Hercynian and Late Himalayan. With low matrix porosity and permeability of the Ordovician carbonate,the secondary solution pores and caverns serve as the main reservoir space.The polyphase tectonic movements formed unconformity reservoirs widely distributed around the paleo-uplifts;and the reef-bank reservoir is controlled by two kinds of sedimentary facies belts,namely the steep slope and gentle slope.The unconventional carbonate pool is characterized by extensive distribution,no obvious edge water or bottom water,complicated oil/gas/water relations and severe heterogeneity controlled by reservoirs. The low porosity and low permeability reservoir together with multi-period hydrocarbon accumulation resulted in the difference and complex of the distribution and production of oil/gas/water.The distribution of hydrocarbon is controlled by the temporal-spatial relation between revolution of source rocks and paleo-uplifts.The heterogenetic carbonate reservoir and late-stage gas charge are the main factors making the oil/ gas phase complicated.The slope areas of the paleo-uplifts formed in the Paleozoic are the main carbonate exploration directions based on comprehensive evaluation.The Ordovician of the northern slope of the Tazhong uplift,Lunnan and its periphery areas are practical exploration fields.The Yengimahalla-Hanikatam and Markit slopes are the important replacement targets for carbonate exploration.Gucheng,Tadong,the deep layers of Cambrian dolomite in the Lunnan and Tazhong-Bachu areas are favorable directions for research and risk exploration. 相似文献
3.
中国海相碳酸盐岩勘探领域拓展历程及沉积学的基本驱动作用 总被引：2，自引：1，他引：1
回顾中国碳酸盐岩油气勘探领域的拓展历程,共经历了三个阶段:第一阶段,上世纪中后期以靖边气田等为代表的找构造高部位的岩溶型油气藏阶段;第二阶段,2000年以来以普光气田等为代表的台地边缘礁滩油气藏拓展阶段;第三阶段,2010年以来克拉通内幕白云岩油气藏新拓展阶段。沉积学的三种基本的水动力储层宏观成因模式是三大碳酸盐岩勘探领域拓展的基本驱动因素:早期勘探阶段的构造高部位岩溶储层宏观分布受控于隆起暴露期的大气水岩溶作用,台缘礁滩储层的宏观分布受控于镶边台地边缘持续的波浪作用,内幕白云岩储层的宏观分布则受控于潮汐作用。大气水岩溶模式的古水文地质系统除了作用于不整合面附近的隆起区,构造低部位和被断裂沟通的远离不整合面地区也能够发育岩溶储层,值得注意的是短暂暴露的准同生岩溶是未来重要勘探方向。浪控台缘礁滩模式具有“盆包台”、“台包盆”、“盆切台”等多种台缘结构模式,它们的储层宏观分布都处于波浪作用的高能礁滩带上,都基本符合威尔逊碳酸盐岩台地模式,只是不同地区的台地边缘具有不同的复杂形状而已,识别深部隐伏裂陷及其周缘礁滩相带是该领域勘探的难点。潮控陆表海台地潮坪模式指导了碳酸盐岩勘探向克拉通内幕白云岩的拓展,该类白云岩储层呈大面积薄互层席状产出,其宏观分布具有进积潮坪楔和潮坪岛拼嵌两种样式,是一个重要的勘探新领域。 相似文献
4.
塔河油田、普光气田碳酸盐岩储层特征对比研究 总被引：2，自引：2，他引：0
中国海相碳酸盐岩油气勘探相继发现了以塔里木盆地塔河油田、四川盆地普光气田为代表的一批大中型油气田。本文系统对比了塔河油田、普光气田碳酸盐岩储层基本特征、成岩作用和控制因素。礁滩型储层一般物性较好,储集类型为孔隙型或裂缝-孔隙型,非均质性弱;风化壳岩溶型储层一般物性较差,储集类型多样,非均质性极强。白云石化是超深层（〉6000m）碳酸盐岩储层形成的重要机制,白云岩较灰岩储层平均孔隙度可提高3．5％～4．0％。硫酸盐热化学还原（TSR）反应主要是对储层进行强烈改造,改善程度并不大。沉积相、构造作用对不同类型储层的影响程度、影响方式不尽一致：对于风化壳岩溶型储层,沉积相的影响主要体现在对岩石可溶性、透水性的控制上,在岩石可溶、透水的基础上构造作用控制了储层的发育范围及程度;礁滩型储层受沉积相的严格控制,构造作用形成的裂缝对储层物性有明显改善。 相似文献
5.
西藏北部改则－班戈地区出露的中上侏罗统接奴群是残余弧后盆地的滨浅海相陆缘碎屑沉积，具有完整的水进－水退沉积旋回。主要沉积相类型有碎屑浅海、高能滨岸、陆源碎屑潮坪、碳酸盐合地、扇三角洲等，向南部冈底期－念青唐古拉岛弧方向超覆，向北部羌塘板片与广阔碳酸盐台地相的佣钦错群过渡。接奴群是该区最有潜力的油气勘探目的层。广阔的浅海相泥页岩为主要的烃源岩，早期滨岸相粗碎屑岩是主要的潜在储集岩，有可能形成的油气藏类型包括超覆岩性油气藏和构造油气藏。 相似文献
6.
塔里木盆地海相碳酸盐岩与油气 总被引：1，自引：0，他引：1
塔里木盆地碳酸盐岩主要分布于台盆区寒武系—奥陶系,它既可以作为油气的储层和源岩,也可以作为油气的盖层或遮挡体。碳酸盐岩主要发育于碳酸盐岩台地相和斜坡相之中,其中开阔台地及台地边缘坡折带的生物碎屑滩和砂屑滩、局限台地的白云岩坪是主要的储集相带。潜山溶孔溶洞型白云岩、石灰岩及礁滩复合体中的生物碎屑灰岩、砂屑灰岩、鲕粒灰岩、礁灰岩以及潮坪白云岩是主要的储集岩。寒武系—下奥陶统、中—上奥陶统都发育有较好的碳酸盐岩烃源岩。根据油气的分布与聚集特点,对碳酸盐岩油气藏作了分类。论述了塔里木盆地碳酸盐岩油气勘探的前景和重要目标。 相似文献
7.
中及上奥陶统是塔中地区主要的油气勘探目的层系之一。在综合地层划分对比的基础上，分析了塔中地区不同沉积相的分布规律。礁滩沉积和斜坡沉积构成了台地边缘相的主体。碳酸盐台地上不同期次发育的边缘相是重要的油气储集体。它们主要分布于塔中I号断裂构造带和TZ10井构造带和塔中南缘断裂构造带上，沉积厚度相对较大。因此，可以得出这样的结论，这种分布状况代表了塔中地区构造对沉积相带的控制作用。通过大量二维及三维地震资料解释分析，发现在塔中广泛分布的丘状隆起地震相、楔状前积反射地震相和杂乱反射地震相相同样多沿主要构造线延伸，内部反射杂乱，成乱岗状反射。把已经认识的沉积相类型和这些地震相的分布特征相比较，可以确定这种地震相就是碳酸盐台地边缘相沉积体。这样，就有可能利用丰富的地震资料，预测有利油气富集的储集体的展布规律。 相似文献
8.
四川盆地东北部长兴组层序地层与储层分布 总被引：52，自引：4，他引：48
四川盆地东北部的二叠系长兴组为一套碳酸盐岩地层。宣汉盘龙洞剖面详尽研究表明,长兴组可分为两个三级层序:第1层序的海侵体系域由开阔台地滩间相沉积组成,高位体系域为台地边缘礁滩相沉积;第2层序的海侵体系域为浅滩沉积,高位体系域为暴露浅滩相-蒸发潮坪相沉积。长兴组中层序界面主要有水下间断不整合面和暴露侵蚀不整合面两类,相当于PeterVail的II类层序界面。在层序地层研究的基础上,对长兴组储层的时空分布特点进行了系统研究。研究发现,储层与层序地层关系密切,储层主要发育在层序的高水位体系域中:礁滩相储层位于第1层序的高位体系域中,而暴露浅滩-蒸发潮坪储层则主要产在第2层序的高水位体系域中。长兴组层序地层格架图以及层序高水位体系域沉积相平面图的编制,成为预测储层二维空间分布的基础。结果表明,礁滩相储层分布于通江—开县碳酸盐台地的东西两侧,暴露浅滩-蒸发潮坪储层遍布于通江—开县的碳酸盐台地及其东西两侧地区之中。两个层序高位体系域中的储层岩石孔隙丰富,储集条件较好,分布面积较广,从而成为研究区域油气勘探的重要目的层。 相似文献
9.
川西北中二叠统栖霞组发育厚层白云岩储层,成为近年来四川盆地油气勘探开发的重点领域,但栖霞组有利相带分布和储层发育的主控因素并不明朗,制约了该地区油气勘探进展。根据野外露头、岩心、薄片、测井和地震资料,结合区域地质演化,对川西北栖霞组沉积特征、沉积格局以及古地貌进行研究发现:川西北栖霞组主要为碳酸盐岩台地沉积,自西北向东南方向依次发育盆地—斜坡相、台地边缘相和开阔台地相,并发育台缘滩或台内滩等若干亚相类型。其中栖一期沉积水体较深,为弱镶边碳酸盐岩台地形成期,台缘滩厚度薄,展布范围有限;栖二期为栖霞组主要成滩期,滩体厚度大,展布范围广,具典型镶边碳酸盐岩台地特征。栖霞组白云岩主要为台地边缘高能滩相沉积背景,栖霞组沉积期,研究区具西北高、东南低,西南高、东北低的古地貌格局,其不仅控制着台地边缘高能滩相的沉积分布,并进一步为该区白云岩储层发育奠定了基础,白云岩具有西北向东南、西南向东北逐渐减薄的特点。结合沉积演化和古地貌分析结果,认为古地貌为栖霞组白云岩发育的主要控制因素,西北及西南方向等古地貌高地为研究区栖霞组白云岩储层发育的有利沉积相带。 相似文献
10.
德令哈地区位于柴达木盆地东北部,油气勘探和研究程度较低。文章在野外地质调查基础上,结合钻井和地震资料解释成果,主要开展下古生界烃源岩、储盖层、储盖组合和输导条件等成藏条件研究,根据构造条件和周边油气发现,对研究区下古生界含油气系统进行推测。研究结果表明,德令哈地区下古生界发育两套烃源岩,即震旦系全吉群红藻山组滨岸潮坪相灰黑色-黑色泥页岩,奥陶系石灰沟组浅海半深海相灰黑色黑色泥页岩。其中,震旦系烃源岩46%达到有效烃源岩标准,有效烃源岩有机质丰度平均为0.72%,奥陶系烃源岩38%达到有效烃源岩标准,且分布于石灰沟组底部,有效烃源岩有机质平均为0.77%;两套烃源岩有机质类型以Ⅰ型为主,热演化程度已进入高成熟-过成熟阶段。研究区发育碎屑岩和碳酸盐岩两类储层,三角洲前缘和台缘礁滩相是优势储集相,碳酸盐岩储层的储集空间主要为裂缝和溶蚀孔隙。根据烃源岩特征和周边油气发现,将研究区划分为推测的Z∈(?)油气系统和OO(?)油气系统。 相似文献
11.
<正>Exploration practices show that the Jurassic System in the hinterland region of the Junggar Basin has a low degree of exploration but huge potential,however the oil/gas accumulation rule is very complicated,and it is difficult to predict hydrocarbon-bearing properties.The research indicates that the oil and gas is controlled by structure facies belt and sedimentary system distribution macroscopically,and hydrocarbon-bearing properties of sand bodies are controlled by lithofacies and petrophysical facies microscopically.Controlled by ancient and current tectonic frameworks,most of the discovered oil and gas are distributed in the delta front sedimentary system of a palaeo-tectonic belt and an ancient slope belt.Subaqueous branch channels and estuary dams mainly with medium and fine sandstone are the main reservoirs and oil production layers,and sand bodies of high porosity and high permeability have good hydrocarbon-bearing properties;the facies controlling effect shows a reservoir controlling geologic model of relatively high porosity and permeability.The hydrocarbon distribution is also controlled by relatively low potential energy at the high points of local structure macroscopically, while most of the successful wells are distributed at the high points of local structure,and the hydrocarbon-bearing property is good at the place of relatively low potential energy;the hydrocarbon distribution is in close connection with faults,and the reservoirs near the fault in the region of relatively low pressure have good oil and gas shows;the distribution of lithologic reservoirs at the depression slope is controlled by the distribution of sand bodies at positions of relatively high porosity and permeability.The formation of the reservoir of the Jurassic in the Junggar Basin shows characteristics of favorable facies and low-potential coupling control,and among the currently discovered reservoirs and industrial hydrocarbon production wells,more than 90%are developed within the scope of faciespotential index FPI0.5,while the FPI and oil saturation of the discovered reservoir and unascertained traps have relatively good linear correlation.By establishing the relation model between hydrocarbonbearing properties of traps and FPI,totally 43 favorable targets are predicted in four main target series of strata and mainly distributed in the Badaowan Formation and the Sangonghe Formation,and the most favorable targets include the north and east of the Shinan Sag,the middle and south of the Mobei Uplift,Cai-35 well area of the Cainan Oilfield,and North-74 well area of the Zhangbei fault-fold zone. 相似文献
12.
中国南沙海域大中型盆地蕴含着丰富的油气资源,这些盆地大多形成于新生代,自下而上沉积陆相—海陆过渡相—海相地层。不同的盆地沉积分布主控因素不同。碎屑岩沉积受控于3大古水系:即华南古陆南缘造山带古水系控制南薇西盆地和北康盆地扇三角洲,巽他陆架古水系控制湄公盆地和万安盆地三角洲,婆罗洲古水系控制曾母盆地和文莱—沙巴盆地扇三角洲与三角洲。碳酸盐沉积受控于水体和构造条件,温暖、干净、适度动荡的浅水环境有利于碳酸盐岩台地和生物礁形成与生长。多种沉积相类型构成多种油气储集体,中新统砂岩和碳酸盐岩储集层最为重要,烃源岩分布具规律性。研究认为块体漂移控制了南沙大中型盆地油气分布,形成3套生储盖组合,发育3类岩性地层圈闭。 相似文献
13.
四川盆地普光气田在近期获得重大突破,普光气田礁滩复合型气藏物质聚集模式及储层特征的深入研究对于川东北地区乃至整个四川盆地的碳酸盐岩有利勘探区的预测具有一定的指导意义。受开江—梁平台盆(inter-platform basin)的控制,普光地区长兴组—飞仙关组在台盆东侧发育了类似于威尔逊相模式的碳酸盐岩沉积体系,主要发育台地蒸发岩、局限台地、开阔台地、台地边缘礁滩、斜坡和台盆沉积相,但陆棚相不甚发育。古地理的分异主要围绕开江—梁平台盆的发育、发展及填平补齐的过程而演化。储层沉积微相及微观地质特征研究表明,台地边缘礁滩相为该区储层发育最有利的相带,海绵障积白云岩、海绵骨架礁灰岩、鲕粒白云岩及残余鲕粒白云岩等为最主要的储集岩类型。优质储层的发育主要受沉积相带展布,后期的白云石化、溶蚀作用以及构造作用的控制。 相似文献
14.
Logging Evaluation of the Ordovician Carbonate Reservoir Beds in the Lungudong Region,Tarim Basin 总被引：3，自引：0，他引：3
YANG Wenjing XIAO Chengwen LIU Luofu QI Guangzhong JIANG Zhenxue YUAN Yunchun WANG Weili YANG Song 《《地质学报》英文版》2010,84(5):1141-1156
<正>In recent years,great progress has been made constantly in oil and gas exploration in the Lungudong region of the Tarim Basin.However,progress has been slow in the evaluation of its main oil-producing horizons-the Ordovician carbonate reservoir beds.Based on previous researches and on the various data such as drilling,geology and oil test,in combination with the interpretation of each single-well imaging and conventional logging data,and through analysis and comparison,the identification methods in imaging and conventional logging for four types of carbonate reservoir beds in this region are summarized in this paper.Calculation formulas for four reservoir bed parameters,i. e.shale content,porosity,permeability and oil saturation in this region are proposed;and reservoir beds in this region are divided into three levels(Ⅰ,ⅡandⅢ) by combining oil test data and logging data,The lower limits of the effective porosity of reservoir beds and the fracture porosity of effective reservoir beds are determined as 1.8%and 0.04%,respectively.The physical property parameters are calculated by conventional logging curves,and the most advantageous areas for reservoir development are predicted comprehensively.On the plane,the high-value zones of reservoir bed parameters are mainly concentrated in the N-S-trending strike-slip fault,the Sangtamu fault horst zone and near the LG38 well area;vertically,the reservoir bed parameters of the Yijianfang Formation are better than those of the Yingshan and Lianglitage formations. 相似文献
15.
塔里木盆地塔中北斜坡奥陶系鹰山组深部优质岩溶储层的形成与分布 总被引：2，自引：0，他引：2
塔中地区是塔里木盆地的重点勘探区域,奥陶系鹰山组蕴藏了丰富的油气资源。鹰山组发育大套台地相碳酸盐岩,以高能相的台内滩沉积为主。鹰山组埋藏较深,但岩溶储层呈大面积厚层状分布。早奥陶世塔中I号断裂使得塔中隆起隆升并遭受强烈剥蚀形成下奥陶统鹰山组顶部风化壳,以孔洞型和裂缝-孔洞型储层为主。通过古地貌恢复、地震属性分析和地震测井联合波阻抗反演技术和方法识别溶洞发育带和断层裂缝发育带,确定出有利储层的分布范围。研究认为,岩性岩相是岩溶型储层发育的重要基础,层间岩溶控制了储层的成层性和横向展布规模,断裂和裂缝网络是岩溶水的主要渗滤通道,埋藏岩溶形成大量有效的缝洞空间,极大地提高了储集性能。研究发现,优质储层主要分布在鹰山组顶面以下120m地层厚度范围内,横向有一定连通性,在断层、构造裂缝和溶蚀作用下形成统一的储集体,呈准层状展布。 相似文献
16.
碳酸盐岩是塔里木盆地塔中地区古生界油气勘探的主要目的层,探讨其成藏主控因素对碳酸盐岩勘探具有重要的意义。针对塔中Ⅲ区油气成藏规律复杂、难以有效拓展的难题,从构造断裂发育演化对碳酸盐岩储层沉积、储层后期改造以及油气运移和聚集的影响入手,明确了受断裂挤压抬升控制的高能相带是岩溶储层发育的物质基础,塔中Ⅲ区广泛发育台内高能滩和台内缓滩;北东向走滑断裂体系羽状破碎带和斜列叠置破碎带是储层最为发育的区域;关键成藏期古构造控制了塔中Ⅲ区古生界油气由北向南的运移路径,鼻状构造区油气运聚有利。在此基础上,结合区域盖层展布特征、储层分类预测结果和实钻油藏特征进行了成藏有利区综合评价,指明了塔中Ⅲ区下步勘探有利方向。 相似文献
17.
Xiaodong Lan Xiuxiang Lü Yanming Zhu Hongfeng Yu Jie Zhou Feng Zhu 《Arabian Journal of Geosciences》2014,7(11):4487-4498
Marine carbonate reservoirs, as a focus of petroleum exploration and development all over the world, are involved with high exploration risk and prediction difficulty owing to high heterogeneity and diversity of reservoir beds. In the Tarim Basin, NW China, carbonate reservoirs with resources about 38 % of the whole basin in a large prospecting area are mainly distributed in the Cambrian and Ordovician in central (Tazhong) and northern (Tabei) Tarim. Recently on the northern slope, Tazhong Low Rise, Central Uplift, Tarim Basin, a breakthrough has been made in the karsted weathering crust of Lower Ordovician Yingshan Formation and reef-flat reservoir of Upper Ordovician Lianglitag Formation. As a new frontier of exploration, oil/gas distribution and controlling factors of carbonate reservoirs in the Yingshan Formation are not clearly understood. In this work, play elements of the Yingshan Formation, such as seal-reservoir bed assemblage, oil/gas properties, and faulting, were studied by core and slice observation and field investigation. High-quality reservoir beds of Yingshan Formation are quasi-layer distributed in the interstratal karst belt about 250 m below the unconformity. The reservoir beds of fracture–void and void are formed by faulting, associated fracturing, and karstification. The Yingshan Formation is a large-scale condensate gas reservoir with partly oil. Owing to different oil–gas infilling periods, isolated pools far from the faults are primarily oil in the Hercynian; oppositely, condensate gas reservoirs near the faults are intensely influenced by gas invasion during the Himalayan movement. Laterally, oil/gas distribution is controlled by stratal pinch-out and strike-slip faults. Vertically, cap rock of the third to fifth members of the Lianglitag Formation and Yingshan interior high resistivity layers are superimposed with Yingshan reservoir beds to form several seal-reservoir bed assemblages. Oil and gas are superimposed and affected by gas invasion with characteristics of oil in the upper horizon and gas in the lower horizon. 相似文献
18.
辽河西部凹陷油气资源非常丰富,通过对己勘探发现的773个油气藏的地质特征参数统计认为,西部凹陷油气藏类型非常丰富,但主要以构造和岩性油气藏为主,且复合油气藏发育,统计表明,近90%的油气藏与断裂有关。油气藏类型受构造带控制作用明显,缓坡带最要以背斜、岩性构造油气藏为主,中央背斜带背斜断块油气藏较为发育,而陡坡带则多为岩性油气藏。沉积相带控油气作用明显,油气藏主要分布在扇三角洲、三角洲和浊积扇相。油气资源在空间上遵循“油气总量平衡模式”,无论在平面上还是层位上,油气资源互补特征性强。研究认为西部凹陷具有生烃洼陷、断裂、异常压力、沉积相带联合控藏的特点。首先沙三段、沙四段有效烃源岩大量发育,资源量极为丰富,为西部凹陷油气富集提供了物质保证,油气藏分布主要受生烃洼陷控制;各组段砂体叠合连片,平面展布连续,具较好的储集能力,也为油气的侧向运移提供的条件;另外东营末期因走滑引起的大量泄压断裂发育,为油气大规模远距离垂向运移提供了可能。 相似文献
19.
鄂尔多斯盆地奥陶系马家沟组四段(简称“马四段”)是下古生界天然气风险勘探的重点层位。文中基于岩心、薄片观察,结合地层对比、沉积结构描述等,并运用岩石结构组分测井解释和井震结合古地貌恢复等手段,对鄂尔多斯盆地马四段沉积时期古地貌、沉积特征和储集层展布进行了详细分析。结果表明: (1)受控于沉积期隆坳相间的古地貌格局,马四段发育大量台地内丘滩微相,其易于发生准同生溶蚀和白云石化作用,是储集层发育的有利相带;(2)马四段储集层以(藻)砂屑白云岩和粉—细晶白云岩为主,储集空间主要为粒间孔、晶间孔、溶蚀孔等;(3)纵向上,储集层主要分布于马四2亚段和马四1亚段;平面上,马四段储集层主要分布于台地内低凸起带和台缘带;(4)储集层的发育受控于3个因素,其中古隆起部位发育的有效丘滩体是储集层形成的物质基础,高频层序控制的准同生溶蚀作用是储集层形成的关键,白云石化是储集层后期保存的重要因素。马四段沉积时期碳酸盐岩台地内隆坳相间的古地貌控制了丘滩相带和白云岩储集层的展布,这一新认识为鄂尔多斯盆地下古生界天然气勘探提供了有力支撑,也为碳酸盐岩台地沉积储集层的研究提供了新思路。 相似文献
20.
Sedimentary Facies and Distribution of Reservoir Rocks from the Feixianguan Formation in the Daxian-Xuanhan Region, NE Sichuan 总被引：1，自引：0，他引：1
MA Yongsheng MOU Chuanlong GUO Xusheng YU Qian TAN Qinyin 《《地质学报》英文版》2006,80(1):137-151
The Lower Triassic Feixianguan Formation in the Daxian-Xuanhan region, northeastern Sicbuan is interpreted to be a carbonate platform intermediate between the West Hubei-East Cbongqing marine basin and Guangyuan-Wangcang marine basin. Outcrops, well logs and seismic data have disclosed that three sedimentary facies can be identified for the formation： open platform, platform exposed shoal and restricted platform facies. During the early stage of deposition of the Feixianguan Formation, there existed a sedimentary framework all the same as the Late Permian one： open platform in the west, and platform exposed shoal, restricted platform and open platform eastwards. The gradual increase of the shoal area permitted eastward migration of the shoal facies. During the deposition of the third member of the Feixianguan Formation, the study area was invaded by temporary transgressions. Till the deposition of the fourth member of the formation, the study area was prevailed over the unified restricted platform deposits, as indicated by the sedimentary model for the typical carbonate platform shoal deposits. The reservoir rocks in the Feixianguan Formation consist mostly of solution opening dolostone, and the rock types are assembled by oolitic dolostone, residual oolitic dolostone and sucrosic residual oolitic medium- to coarse-grained dolostone. The deep and shallow dual laterologs show relatively high resistivity, clear amplitude differences and time difference saltation of acoustic waves in some intervals. The seismic responses are indicated by low-frequency and highly variable amplitudes and chaotic reflection configurations. The reservoir rocks are characterized by high porosity-high permeability and medium porosity-medium permeability, showing a marked correlation between porosity and permeability. Solution openings are extremely developed in the reservoir rocks, including cast pores, intergranular solution openings, intercrystal pores, intercrystal solution openings, solution openings （caves） and minute fissures. Macropores and coarse pore throats are common. The reservoir rocks are apparently controlled by sedimentary facies in distribution patterns. Vertically, they occur dominantly in the second and first members of the Feixianguan Formation, and laterally in the platform exposed shoals and restricted platforms, where good natural gas potential is expected. 相似文献