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应用印模法恢复了鄂尔多斯盆地前侏罗纪古地貌形态。研究表明，区内古地貌格局由“三斜坡、三河谷、两河间丘和一梁”组成，即姬塬东斜坡、定边斜坡、靖边斜坡，宁陕河谷、蒙陕河谷、甘陕河谷，吴旗河间丘、金鼎河间丘和新安边梁。前侏罗纪古地貌控制着下侏罗统延安组早期沉积。延10段属河流相沉积环境，发育的沉积微相有主河道、支流河道、河漫滩、河漫沼泽。延9段沉积环境为三角洲到湖泊环境，沉积相主要由三角洲平原亚相、三角洲前缘亚相组成，沉积微相以分流河道、分流间洼地、水下分流河道和分流间湾为主。相同的古地貌单元、不同的沉积环境，必然造成储集砂体形态特征及分布规律的变化，进一步影响油藏的形成和分布。古地貌油藏的形成除受油源、圈闭等基本条件制约外，古地貌 沉积组合和油气运移通道也是形成不同类型古地貌油藏的重要条件。依据已探明油田的空间分布结合古地貌、上覆地层沉积环境、砂体展布、运移通道类型等多种因素归结出定边-吴旗地区古地貌油藏三种成藏模式，即斜坡区-三角洲平原组合成藏模式、河间丘区-三角洲前缘组合成藏模式和斜坡区-三角洲前缘组合成藏模式。 相似文献
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侏罗系是鄂尔多斯盆地石油勘探与开发的重要目的层。华庆地区富县组油藏是近年鄂尔多斯盆地侏罗系勘探取得重大突破的新区块和新层系,已展现出良好的勘探前景和资源潜力。本文利用印模法等方法精细刻画了华庆地区前侏罗纪古地貌特征,深入分析了侏罗系富县组油藏控制因素和富集规律。结果表明,华庆地区侏罗系富县组油藏主要来源于下部三叠系延长组优质烃源岩,油藏类型为构造油藏和岩性-构造油藏,发育在古地貌斜坡带背景之上的河道边滩沉积主砂带内。油藏富集主要受控于前侏罗纪古地貌特征,充足的油源供给、河道边滩相沉积、优越的输导条件、鼻隆构造及良好的泥岩封堵等是华庆地区富县组油藏富集的主要控制因素。 相似文献
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三叠纪末的印支运动使鄂尔多斯盆地整体抬升,上三叠统延长组顶部遭受到强烈风化及河流侵蚀等地质作用,形成水系广布、沟壑纵横、丘陵起伏的古地貌景观。通过对下侏罗统延安组延10油层组和富县组地层等厚图及延长组顶面起伏图的编绘,基本恢复了前侏罗纪古地貌形态,并将其划分为河谷、斜坡、阶地、高地、平原和潜丘6种古地貌单元。该种古地貌景观严格控制了下侏罗统富县组及延安组下部的沉积相类型、相带展布及压实披盖构造的形成。古河谷的下切作用不仅使延安组下部与油源层的接触距离缩短,又为油气运移提供了良好的通道,如遇到有利的储集体与背斜、鼻隆等构造,即可有机配置、富集成藏;同时地层水特征表明斜坡带保存条件最好。指出前侏罗纪古地貌斜坡带上的坡嘴、阶地及潜丘是勘探延安组下部油藏的有利地带。 相似文献
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鄂尔多斯盆地陇东地区侏罗系古地貌恢复
及其对石油聚集的影响 总被引：2，自引：0，他引：2
根据测井、地震和岩心等地质资料,运用印模法及综合地质法对鄂尔多斯盆地陇东地区侏罗系沉积前的古地貌进行恢复。研究表明,鄂尔多斯盆地陇东地区侏罗系古地貌形态主要为古高地、谷河谷、古谷坡、古河间丘、古阶地。对侏罗系沉积前古地貌对延安组油藏的控制分析认为,油藏主要分布于紧邻高地的古谷坡等地势相对较高的地带。古地貌形成的有利成藏条件为下切河谷提供了来自延长组烃源岩生成的油气向上运移通道,古谷坡控制着储层砂体的类型和分布规模,地层“印模”所产生的差异压实形成了后期构造圈闭的相对高点。 相似文献
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周家湾地区前侏罗纪古地貌恢复及油气富集规律 总被引：3，自引：1，他引：2
前侏罗纪古地貌控制着中下侏罗统沉积发育及油气的富集规律, 精确恢复刻画古地貌形态对于侏罗系油气勘探至关重要.以鄂尔多斯盆地周家湾地区为例, 在沉积相、砂体展布、古流向物源、古厚度恢复、古水深校正等分析的基础上, 结合地质、钻井、测井等解释资料, 应用三维储层建模技术, 定性定量地对前侏罗纪古地貌进行了恢复.同时建立了三维砂体、孔隙度、渗透率模型, 从生、储、盖、圈、运、保等油气成藏条件, 直观地解释了古地貌油气富集规律.依据以上模型, 预测出油气有利储集区分布在三大斜坡储集带的河流边滩砂体和河谷内的心滩处, 为勘探开发提供了可靠依据. 相似文献
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鄂尔多斯盆地早侏罗世富县期冲积扇沉积 总被引：7，自引：0，他引：7
在综合研究野外露头、钻井剖面及室内编图、地层对比的基础上，指出鄂尔多斯盆地冲积扇－河流沉积体系是侏罗纪富县期主要的古地理格局，富县期沉积受与古地貌密切相关的五条河谷控制。认为鄂尔多斯盆地侏罗纪富县期冲积扇沉积具进积型特征，其形成与古地形密切相关，分布于古甘陕，庆西河谷内。 相似文献
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沉积时期的古地形、古地貌是控制沉积相发育与分布的一个重要因素,其在一定程度上也控制着后期油气圈闭的类型与分布。通过补偿印模法恢复了吴旗油区前侏罗纪古地貌形态,确定局部构造特征,开展有利储集相带预测。研究区油藏分布主要受控于古地貌形态,深切延长组的古河谷是油气运移的主要通道,古地形高部位为油气运移的主要方向,古河谷附近的砂体为油气富集的有利场所,上覆的沼泽相泥岩形成了良好的岩性遮挡条件。 相似文献
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冀中饶阳凹陷蠡县斜坡古近系沙河街组沙二段及沙一段下亚段沉积相与隐蔽油藏 总被引：9，自引：2，他引：7
蠡县斜坡是冀中饶阳凹陷西部的一个大型宽缓斜坡,以倾向上的小坡降和走向上的古地形差异相对较显著为特征,自北而南呈现出台地区和单斜区等不同的地貌单元。区内古近系沙河街组沙二段和沙一段下亚段发育“浅水型”三角洲和滨浅湖滩坝两种沉积相类型,构成了斜坡带的主要储集体。根据斜坡带走向上的古地貌、沉积相类型等基本因素的差异,可归纳为两种类型的砂体发育区：1）斜坡南段单斜区的三角洲相砂体发育区和2）斜坡北段台地区的滩坝相砂体发育区。通过隐蔽油藏勘探方向分析,认为这两种不同类型砂体发育区的隐蔽油藏形成条件各异。以台地区的滩坝相砂体发育区最为有利,是隐蔽油藏勘探的主要方向。在斜坡的内带、中带和外带等不同部位,隐蔽油藏成藏模式也各不相同,以斜坡中带的隐蔽油藏类型发育最为齐全,是寻找规模储量的主要靶区。 相似文献
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<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
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LIU Xin WANG Feng LIU Baojun TIAN Jingchun SHANG Ting MA Jiong ZHANG Zhongyi ZHANG Xiaolei 《《地质学报》英文版》2020,94(2):467-484
The sedimentary, paleogeomorphological and reservoir characteristics of the Jurassic Yan’an Formation in the southwestern Ordos Basin, northwestern China, were studied by means of casting thin sections, scanning electron microscopy, inclusion analysis and identification of low-amplitude structures. A model for reservoir formation is established, and the controlling effects of sedimentary facies, paleotopography, low-amplitude structures and formation water on oil reservoirs are revealed. There are significant differences in the sedimentary characteristics, structural morphology and paleowater characteristics between the reservoirs above the Yan 10 Member and those in the Yan 9 to Yan 7 Members. The Yan 10 Member contains fluvial sediments, whereas the Yan 9 to Yan 7 members contain delta-plain anastomosing-river deposits. The distribution of high-permeability reservoir is controlled by pre-Jurassic paleogeomorphology and sedimentary facies. Some of these facies exhibit high porosity and high permeability in a lowpermeability background. The main hydrocarbon accumulation period was the late Early Cretaceous, filling was continuous, and the charging strength altered from weak to strong and then from strong to weak. The Yan 10 reservoir is mainly controlled by the paleogeomorphology: hydrocarbons migrated upward at a high speed through the unconformity surface, and accumulated in the favorable traps formed by paleogeomorphic structural units, such as gentle slopes or channel island. Furthermore, groundwater alternation in these areas was relatively stagnant, providing good reservoir preservation conditions. The reservoirs in the Yan 9 and higher members are controlled by the sedimentary facies, lowamplitude structure and paleowater characteristics. Hydrocarbons migrated through the three-dimensional delivery system, influenced by favorable sedimentary facies and high-salinity groundwater, then accumulated in the favorable low-amplitude structural traps that formed during the hydrocarbon production period. 相似文献
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Yuan Zhong Lu Zhou Xiucheng Tan Chengbo Lian Hong Liu Jijia Liao Guang Hu Mingjie Liu Jian Cao 《地学前缘(英文版)》2017,8(5):961-975
Sand-rich tight sandstone reservoirs are potential areas for oil and gas exploration. However, the high ratio of sandstone thickness to that of the strata in the formation poses many challenges and uncertainties to traditional lithofacies paleogeography mapping. Therefore, the prediction of reservoir sweet spots has remained problematic in the field of petroleum exploration. This study provides new insight into resolving this problem, based on the analyses of depositional characteristics of a typical modern sand-rich formation in a shallow braided river delta of the central Sichuan Basin, China. The varieties of sand-rich strata in the braided river delta environment include primary braided channels, secondary distributary channels and the distribution of sediments is controlled by the successive superposed strata deposited in paleogeomorphic valleys. The primary distributary channels have stronger hydrodynamic forces with higher proportions of coarse sand deposits than the secondary distributary channels. Therefore, lithofacies paleogeography mapping is controlled by the geomorphology, valley locations, and the migration of channels. We reconstructed the paleogeomorphology and valley systems that existed prior to the deposition of the Xujiahe Formation. Following this, rock-electro identification model for coarse skeletal sand bodies was constructed based on coring data. The results suggest that skeletal sand bodies in primary distributary channels occur mainly in the valleys and low-lying areas, whereas secondary distributary channels and fine deposits generally occur in the highland areas. The thickness distribution of skeletal sand bodies and lithofacies paleogeography map indicate a positive correlation in primary distributary channels and reservoir thickness. A significant correlation exists between different sedimentary facies and petrophysical properties. In addition, the degree of reservoir development in different sedimentary facies indicates that the mapping method reliably predicts the distribution of sweet spots. The application and understanding of the mapping method provide a reference for exploring tight sandstone reservoirs on a regional basis. 相似文献
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骨架砂体作为油气输导体系的重要组成要素,控制着油气在空间上侧向的运移以及分布,其有效连通常受到砂体内部断层发育以及砂体微观非均质性的影响.通过对准噶尔盆地车排子凸起西翼地区主要井位进行单井分析,在明确区域地层格架与沉积相的基础上,划分侏罗系头屯河组及八道湾组各段的骨架砂体;并在此基础上绘制骨架砂体连井剖面图以及平面分布等值线图,对研究区骨架砂体的宏观连通性进行研究;再进一步通过对各层位的砂体系统取样,进行孔渗性分析,定性描述其微观连通情况;运用地质统计学方法,对骨架砂体微观连通性进行定量评价.结果表明,从剖面、平面、微观3个方面针对侏罗系头屯河组和八道湾组骨架砂体进行综合评价,研究区骨架砂体连通性相对较好的组段为侏罗系头屯河组三段及八道湾组三段. 相似文献
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准噶尔盆地莫索湾地区位于中央坳陷莫索湾凸起上,紧邻盆地的主要生排烃凹陷,成藏条件优越。白垩系清水河组具有良好油气显示,盆参2井试油荻油流,该区为清水河组高效油藏勘探新领域。运用地质、工程、地震一体化研究技术,对莫索湾地区清水河组油藏类型、主控因素、成藏特征以及成藏模式进行了分析。莫索湾地区构造位置有利,深层油源断裂和浅层运移断裂发育且匹配良好,油藏类型为"泥包砂"型高效岩性油藏;同时,广泛发育水进型滨浅湖退积滩坝砂体,储层质量优良,物性随埋深增加变好。油气藏符合烃源灶+断裂泵+岩性体的"三位一体"成藏总模式,烃源灶是起点和油源,断裂泵是动力和通道,岩性体是载体和圈闭,三者共同控制了清水河组油气的生成、运移、聚集和成藏以及油气藏的类型和分布。 相似文献
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彭阳地区低幅度构造广泛发育,但由于远离烃源区,油气经历了远距离垂向和侧向运移,导致其对油水分异和与成藏富集的关系不明确。以彭阳地区地质构造演化研究为基础,深入研究了延9层低幅度构造发育特征,结合大量钻井及试采资料,研究了彭阳地区低幅度构造与油气成藏和富集的关系。结果表明,彭阳地区低幅度构造广泛发育,以鼻隆构造为主,构造幅度在18 m以上、闭合面积大于2.8 km2的低幅度构造能够形成有效的油水分异和油气滞留效应,可为油气聚集成藏提供良好的圈闭作用。研究区成藏受古地貌控制,有古地貌坡嘴成藏和河道源头坡度成藏两种古地貌成藏类型,位于古地貌优势成藏区域的低幅度构造易于大面积成藏。彭阳地区低幅度构造可分为10个构造组合单元,其成藏控制因素因所处研究区位置不同而出现差异。东北部(1)—(5)构造组合近生烃中心且位于侏罗系古地貌优势成藏区域,油气主要受构造控制,油气规模随构造幅度和闭合面积的增大而增大;西南部(6)—(10)构造组合单元不在古地貌优势成藏区域,低幅度构造是油气成藏的必要条件而非主控因素,低幅度构造的规模和含油气性也无明显的相关性。 相似文献