共查询到20条相似文献，搜索用时 46 毫秒
1.
鄂尔多斯盆地胡尖山-耿湾地区延长组长6油层组沉积微相特征 总被引：9，自引：0，他引：9
鄂尔多斯盆地胡尖山—耿湾地区延长组长6油层组主要由灰色、浅灰色中细砂岩、细砂岩与泥岩互层组成.在岩心、测井、单井相及测试资料分析的基础上,分析了研究区长6油层组的沉积微相特征及各小层沉积微相平面展布特点.结果表明:长6油层组为三角洲前缘沉积,水下分流河道、河口坝、分流间湾、远砂坝及前缘席状砂构成其主要微相,有利储集砂体为水下分流河道和河口坝砂体.长63期水下分流河道砂体之间交汇作用不强;长62期水下分流河道砂体多交叉汇合成网状;长61期不同级次的水下分流河道交叉叠合连片更加明显,砂体厚度大、分布广,为研究区长6油层组主力产层. 相似文献
2.
根据岩心观察并结合铸体薄片、扫描电镜、粒度分析和测井资料,划分了安塞油田王侯杏坪地区长6油层长62、长63小层沉积微相类型,分析了沉积演化、沉积相与油气分布关系。结果表明:研究区以湖泊河控三角洲前缘亚相为主,发育水下分流河道、水下分流间湾、前缘席状沙和水下天然堤等沉积微相,骨架砂体为水下分流河道沉积;受河道迁徙冲刷影响,水下分流河道和分流间湾相间分布,形成研究区主要生储盖组合;沉积相对长6油层下段油藏分布起主要控制作用,油气聚集主要受分流河道砂体展布控制,储层发育的水下分流河道砂体是该区今后勘探的主要目标。 相似文献
3.
4.
通过岩心观察、大量测井及相关测试资料分析统计,确定了大路沟二区长6_1油层的沉积类型为三角洲前缘亚相沉积,主要发育水下分流河道、河道侧翼、分流间湾及河口砂坝四种微相,分析了各种沉积微相的特征。研究表明水下分流河道微相是长6_1油层的主要沉积微相,水下分流河道砂为储集层骨架砂体。同时对长6_1油层各小层的沉积微相平面展布和砂体展布特点进行了分析,认为油气的聚集主要受沉积微相的控制,水下分流河道为长6_1油层良好的储集层,是研究区油气开发的方向。 相似文献
5.
6.
鄂尔多斯盆地姬塬地区长6油层组沉积微相特征 总被引：1，自引：1，他引：0
利用岩心测井、粒度分析和薄片鉴定等资料综合分析,揭示出研究区长6油层组以三角洲前缘亚相沉积为主,可细分为水下分流河道、河口坝、水下分流间湾、水下决口扇和水下天然堤5个沉积微相,并分析了各小层沉积微相的平面展布规律和沉积微相对储层的控制作用。结果表明,长6油层组的优质储集体主要赋存于水下分流河道砂体及水下分流河道与河口坝组合砂体中,总体上长612、长621和长622期优质储层展布范围较广,平面上连片分布,垂向上相互叠置,是下一步工作的主要目标层位。 相似文献
7.
鄂尔多斯盆地伊陕斜坡中部长6油层组沉积微相及其含油性研究 总被引：3，自引：0，他引：3
研究区位于鄂尔多斯盆地伊陕斜坡中部,延长组长6油层是研究区主要目的油层,因此了解其沉积相类型及平面展布,探讨沉积微相与油气分布的关系,对勘探开发有指导意义。以岩芯及野外剖面观察为基础,通过岩石相、测井相、粒度和薄片鉴定资料的综合分析,揭示出研究区长6油层为三角洲前缘亚相,并可以细分为水下分流河道、河口坝、水下分流间湾、席状砂、水下决口扇和水下天然堤6个沉积微相,分析了各小层沉积微相的平面展布规律;在此基础上,首次将定量统计学方法应用于含油砂体沉积微相的分析,研究表明,长6油层的油气主要赋存在水下分流河道砂体及水下分流河道与河口坝组合砂体中,在层位上又以长61为主,是下一步主要勘探目标。 相似文献
8.
在岩心描述的基础上，对杏河地区长6油层沉积相进行了分析，提出了该区主要沉积相为湖泊环境的河控三角洲体系，主要为三角洲前缘亚相沉积，主要沉积微相有水下分流河道、分流河口砂坝、前缘砂席和分流间等，分流河道和河口砂坝是本区占主导地位的骨架砂体。该区长6油层的三角洲体系是安塞三角洲体系最早发育的一支，早期分流来自于北部，后期分流转由东北方向进入，由于各期分流河道迁移、袭夺、决口以及因压实的均衡调整等，从而形成三角洲复合体内部各分流三角洲砂体的相互叠置交错。根据岩心微相分析、小层砂体形态和测井剖面对比分析，对该区长6油层砂组及小层的沉积微相进行了研究，掌握了沉积微相的时空展布和变化规律。 相似文献
9.
麻黄山西区长6~4+5油层组油气显示普遍,但试油水多油少,砂体展布及连续性不清。为搞清研究区的沉积微相展布及演化规律,通过岩心详细观察描述,结合测井资料,识别出6种沉积微相、10种沉积构造,总结出10种微相接触样式和5种沉积层序模式,分别代表不同的沉积相带。垂向表现为以反旋回为主,兼有短期正旋回的沉积特征;侧向河口坝(或分流间)与水下分流河道相间发育,河道砂体下部为“多而小,窄而薄”,上部为“少而大,宽而厚”。采用“单因素分析多因素综合”的研究方法,将该区划分为三角洲内前缘、三角洲外前缘和前三角洲3个亚相带,内前缘以水下分流河道、河口坝和水下分流间湾微相为主;外前缘以远砂坝和席状砂微相为主;前三角洲以滨浅湖泥微相为主。根据现代沉积相模式,推测该区为建设性辫状河道 湖泊三角洲,其演化表现为3个阶段:初始发育期(长63),以前三角洲和三角洲外前缘相带为主;早中发育期(长62和长61),以三角洲内前缘及外前缘相带为主,各微相多为单期发育,交互沉积;中后发育期(长4+52和长4+51),主要发育三角洲内前缘相带,水下分流河道表现为多期叠加样式。 相似文献
10.
11.
Guboglo M. N. 《GeoJournal》1980,4(1):53-58
International unity is becoming ever stronger in this country owing to an increasing similarity in the development of the cultural environment. This comprises the provision of all the country's republics with a sufficient number of schools, theatres, and other institutions and cultural information media in accordance with the needs of the population. An important part is played by the rise in ‘the general educational level, as well as the level of professional qualifications and skills. Among all the Soviet nations and nationalities, this rise being more rapid among formerly backward peoples. Prominent among the factors of internationalization is the progressive development of the nationalities’ cultural resources, while professional culture is being increasingly brought within the reach of the masses.The implementation of the nationalities policy promotes the all-round development of all Soviet nations and nationalities, their drawing together, the upsurge of the individual capabilities of every Soviet citizen. 相似文献
12.
Jiayu Rong Michael Melchin S. Henry Williams Tatyana N. Koren Jacques Verniers 《《幕》》2008,31(3):315-318
The Global Stratotype Section and Point （GSSP） for the base of the Silurian System was defined in 1985. Since that time, a number of researchers have suggested that this section has serious deficiencies for use as a GSSP. As a result, in 2000, the Subcommission on Silurian Stratigraphy （SSS） proposed undertaking a formal restu@ of this GSSP, which was subsequently approved by the International Commission of Stratigraphy （ICS）. The result of this restudy was the formal proposal that the current GSSP, at 1.6 m above the base of the Birkhill Shale, at Dob＇s Linn, Scotland, should be maintained as the same locality and stratigraphic level, but the bios- tratigraphical definition of the boundary should be revised. The previously defined, basal Silurian grapto- lite zone, the Parakidograptus acuminatus Zone, should be subdivided into a lower Akidograptus ascensus Zone and a higher E acuminatus Zone. The base of the A. ascensus Zone, marked by the first appearance of A. ascensus, should be regarded as the biostratigraphic mark for the base of the Silurian. This proposal has now been formally approved by the SSS and ICS, and ratified by International Union of Geological Sciences. This is the first GSSP to undergo formal restudy and redefini- tion, and the proposal also included a recommended procedure for restudy of GSSPs. 相似文献
13.
Deviation of the major axis of the inertia ellipsoid of the Moon from the direction toward the Earth
B. P. Kondratyev 《Astronomy Reports》2017,61(8):709-714
It is known from observations that the center of mass of the Moon does not coincide with the geometric center of its figure, and the line connecting these two centers is not aligned with the direction toward the center of the Earth, instead deviating toward the Southeast. This stationary deviation of the axis of the inertia ellipsoid of the Moon to the South of the direction toward the Earth is analyzed. A system of five linear differential equations describing the physical libration of the Moon in latitude is considered, and these equations are derived using a new vector method taking into account perturbations from the Earth and partly from the Sun. The characteristic equation of this system is obtained, and all five oscillation frequencies are found. Special attention is paid to the fifth (zero) frequency, for which the solution of the latitude libration equations are stationary and represents a previously unknown additional motion of the rotational axis of theMoon in a cone with a small opening angle. In contrast to the astronomical precession of the Earth, the rotation of the angular-velocity vector is in the positive direction (counter-clockwise), with the period T 3 = 27.32 days. On this basis, this phenomenon has been named “quasi-precession.” This quasi-precession leads to a stationary inclination of the major axis of the inertia ellipsoid of theMoon to the South (for an observer on Earth), making it possible to explain one component of the observed deviation of the center of mass of the Moon from the direction toward the Earth. The opening angle of the quasiprecession cone is approximately 0.834″. 相似文献
14.
Important tendencies in development of the world mineral-resources sector at the beginning of the 21st century were an increase in production and consumption of mineral materials differentiated by types of metals and nonmetallic mineral raw materials, by countries and regions, as well as the concentration of the production of mineral raw materials in a small number of countries, and a reduction in industrial reserves of minerals in the world economy, even at the current stage of their extraction. These tendencies should be taken into account in working out a strategy for development of the Russian mineral raw-material base. 相似文献
15.
Fouad N. Ibrahim Dr. 《GeoJournal》1988,17(1):133-141
Taking the example of W Sudan, an analysis of the climatic incidents leading to the two recent famine disasters is made. On this natural background, the human side is investigated. Focus is directed towards the fragile economic structure of the famine-prone population groups. An early-warning system for famine in the Sahelian Zone is proposed taking grain production and storage, livestock development and the relationship between the prices of livestock and grain as major indicators. 相似文献
16.
东濮凹陷北部沙三中亚段广泛发育盐岩和烃源岩,这两个看似不能共存的物质却在这里互层共生。该时期研究区沉积特征为多盐韵律与多层烃源岩互层共生、连续沉积,单个盐韵律厚度从几米到十几米,烃源岩有机质丰度高、类型好。平面上,两者在湖盆沉积沉降中心共生;垂向上,高有机质丰度、好干酪根类型与高盐度地层具有较好的对应关系。因而成为恢复古气候和古环境的重要研究对象。通过岩石学、古生物学以及Sr/Ba、B/Ga、(V+Ni+Mn)、Fe/Mn、Sr/Cu、Mg/Ca、V/(V+Ni)、稀土元素含量和氯同位素等方法对凹陷北部沙三中亚段的沉积环境进行研究。结果表明,凹陷北部沙三中亚段为深水沉积的还原环境,古盐度较高,达到半咸水-咸水沉积;微量元素和孢粉化石特征表明研究区沙三中亚段为温暖潮湿的环境。 相似文献
17.
18.
19.
郯庐断裂南段研究进展与断裂性质讨论 总被引：13，自引：3，他引：13
据1：5万区域地质调查和专题研究资料，就郯庐断裂带是否南延与消失的原因，其与大别—苏鲁造山带交截形成的假位错效应，以及与中新生代沉积盆地形成演化的关系等作了新的阐述。在此基础上，讨论了郯庐断裂带是否为巨大的左行平移断层或转换断层。认为郯庐断裂带可能是在“古郯庐带”的基础上于早侏罗世重新活动、白垩纪强烈活动的地堑型枢纽断裂带。 相似文献
20.
The Importance of the Precipitation and the Susceptibility of the Slopes for the Triggering of Landslides Along the Roads 总被引：3，自引：1，他引：2
Clemente Irigaray Francisco Lamas Rachid El Hamdouni Tomás Fernández José Chacón 《Natural Hazards》2000,21(1):65-81
In order to characterise the influence of the heavyrains on the observed landslides during the 1996–1997hydrological cycle, rainfall records for the last 100years are analysed from 104 stations in easternAndalusia. Regarding the amounts of rain recordedbetween October 1996 and March 1997 in the 104stations studied, 31 presented new all-time records;15 presented values that were 80–100% of thepre-1995 record; 49 stations, 80–50%; and 9stations, < 50%. A map has been devised of thesusceptibility of the materials through which thesouth-eastern Andalusian road network crosses,together with an inventory of the damage caused byinstability phenomena on banks and cuttings of theroad network during the winter of 1996–1997. Therelationships between the rainfall during the studyperiod, the damage caused to the road network and thesusceptibility of the materials affected are analysed.The results indicate that there is a clearcorrespondence between the rainfall recorded and thesusceptibility of the materials with the inventorieddamage. It is concluded that the widespread seriousdamage caused in early 1997 to the roads andsurrounding areas in the Alpujarra region and thecoast of the Province of Granada was mainly caused bythe extraordinarily heavy rains. However, considerablyless damage was observed where the susceptibility ofthe terrain is low, thus highlighting the extremeusefulness of terrain-susceptibility maps for riskprevention and territorial planning. 相似文献