共查询到20条相似文献，搜索用时 593 毫秒
1.
利用薄片鉴定、扫描电镜、压汞实验及物性分析等资料,系统研究了马岭油田北三区延1021储层特征及其控制因素。结果表明,研究区延1021储集层以成分成熟度、结构成熟度中等或偏低的岩屑长石砂岩及长石石英砂岩为主,为典型的低孔、低渗储层;储层内部构型以泥质夹层为主。储集空间以粒间孔为主,孔隙结构微观非均质性强,较大喉道控制储层渗流能力。沉积相带的差异导致储层物性的差异,并影响成岩作用的类型和强度。压实、胶结作用是储层致密的主导因素,溶蚀作用在改善储集空间的同时,还增强了孔喉连通性。微观孔隙结构可有效反映储层品质特征。 相似文献
2.
鄂尔多斯盆地陇东地区三叠系延长组长8储层特征 总被引：15，自引：1，他引：15
鄂尔多斯盆地陇东地区延长组长8油层段是重要的储集层之一,包括长81和长82两个砂岩组。通过储层岩石学、储层物性、孔隙结构及储层控制因素等方面对储层特征进行分析,总结并评价储层储集性能。研究结果表明,储层岩石类型主要为中细粒长石砂岩和岩屑长石砂岩,成分成熟度低,结构成熟度中—高;岩石物性总体较差,属低孔、低渗储层,发育粒间孔隙、溶蚀孔隙、晶间孔等孔隙类型,喉道以中细喉—细喉为主。储集性变化受沉积作用和成岩作用控制,沉积作用控制了储层砂体展布,进而影响其岩石学特征的表现,压实作用、胶结作用和溶蚀作用控制了储层孔隙结构特征及储层物性,根据岩性和物性分析特征可将储集岩分为4类,优质储层的勘探应以沉积作用控制的多套砂体相互叠置的水下分流河道沉积为重点。 相似文献
3.
研究鄂尔多斯盆地志丹地区长9油层组的储层地质特征,通过钻井取心、薄片鉴定、物性分析及测井等资料,综合分析长9油层组的沉积、储层和成岩作用特征及其储集物性的影响因素。研究表明：长9油层组主要为三角洲前缘水下分流河道、滨浅湖和半深湖—深湖沉积,岩性以细粒长石砂岩和长石岩屑砂岩为主,整体具有成分成熟度低而结构成熟度较高的特点,孔隙类型以残余粒间孔和溶蚀孔隙为主,储层物性差,为超低孔低渗的致密砂岩储层。鄂尔多斯盆地志丹地区长9储层地质特征复杂,储集物性受沉积微相和成岩作用的共同控制,以水下分流河道砂为主要储集体,压实作用和胶结作用使储层物性明显变差,而溶蚀作用对储层物性起主要贡献作用。 相似文献
4.
运用钻井岩心、铸体薄片、扫描电镜等资料,研究了两北地区三叠系深部碎屑岩储层的特征及储层发育的控制因素。研究表明,三叠系主要岩石类型为长石岩屑砂岩和岩屑砂岩,具有成分成熟度低和结构成熟度中等的岩石学特征。储集空间以粒间溶孔为主,其次为裂缝,属于中孔、中-低渗型储层。在后期成岩作用的改造下,储集性能明显变好。分流河道和河口坝砂岩具有良好储层物性,方解石、长石、岩屑在大气水和有机酸的溶蚀作用下,产生大量的溶蚀孔隙,改善了储集性能,溶蚀作用是形成优质深部碎屑岩储层的关键因素。 相似文献
5.
采用铸体薄片、岩石薄片、扫描电镜和压汞实验、物性分析等测试资料,对珠江口盆地白云凹陷北坡珠江组陆架边缘三角洲前缘砂体储层特征及控制因素进行研究。结果表明,该储层主要为灰色中细粒岩屑砂岩,成分成熟度、结构成熟度均较低。储集空间以次生孔隙为主,其次为剩余原生粒间孔、原生孔隙等。储层具有排驱压力较高、配位数较高、孔喉半径小和孔喉分选性较差的孔隙结构特点,为中-低孔、中-低渗型储层。储层发育受沉积相和成岩作用的复合控制,水下分流河道砂体储集物性明显优于其它微相砂体。成岩作用过程主导储层物性变化,砂岩储集体中的原生储集空间因机械压实作用、胶结作用而大幅降低,后期溶蚀作用产生较多的次生储集空间,尤其是长石的溶蚀极大改善了本区储层物性,导致储集体中溶蚀性次生孔隙为主要的储存空间。 相似文献
6.
7.
8.
冀中坳陷霸县凹陷文安斜坡沙三段储层特征及有效储层控制因素 总被引：1，自引：0，他引：1
综合运用岩心观察、薄片鉴定、物性分析等技术方法,系统分析了文安斜坡沙三段储层岩石学特征、成岩作用特征及储集特征。研究表明,文安斜坡沙三段储层岩石类型以岩屑长石砂岩为主,杂基含量低,成分成熟度和结构成熟度中等;储集空间以原生孔隙为主,占总孔隙的72.81%,储集物性较差,属中低孔-低渗特低渗储层;储层主要经历了压实作用/早期碳酸盐胶结→长石、岩屑溶解/石英次生加大/高岭石充填→石英溶解/碳酸盐胶结→黄铁矿胶结。在有效储层物性下限计算的基础上,选取孔隙度差值作为参数,系统分析了有效储层控制因素。有效储层的形成主要受沉积微相、粒度、分选、成岩作用以及地层压力控制。水下分流河道和河口坝微相中碎屑颗粒越粗,分选越好,杂基含量越少,有效储层越发育;胶结作用对储层物性的控制较明显,是影响中深层储层物性的主要因素;溶蚀作用主要表现为长石等硅酸盐矿物的溶蚀,平均增孔量3.42%;早期地层超压抑制压实作用,保护孔隙,是有效储层发育的有利因素。 相似文献
9.
山东东营牛庄洼陷沙三中亚段浊积砂体储层特征及影响因素 总被引：15，自引：3，他引：15
山东东营牛庄洼陷沙三中亚段浊积砂体储层以长石细砂岩、岩屑细砂岩及粉砂岩为主 ,结构成熟度及成分成熟度均较低。储层微观特征研究表明 ,砂体中发育了剩余原生粒间孔、粘土矿物杂基内的微孔隙、粒间溶孔、粒内溶孔及微裂缝等储集空间类型 ,孔隙结构以低渗细喉型为主 ,为物性较差的中低孔、低渗型储层。通过对储层物性影响因素的研究得出 ,岩石组构、沉积微相、成岩作用和异常超压的形成与分布是影响本区浊积砂体储层物性的主要因素。其中 ,碳酸盐胶结物、硅质胶结物及自生粘土矿物是致使储层物性变差的主要原因 ,沉积物中有机质的大量生烃以及粘土矿物在转化过程中所释放出的酸性水的溶解作用是产生次生孔隙的重要因素 ,而异常超压的存在、高的地温场及烃类的早期进入是部分原生孔隙和次生孔隙得以保存的重要条件。 相似文献
10.
11.
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
12.
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
13.
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
14.
15.
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
16.
某高速公路下伏煤矿采空区稳定性分析 总被引：10，自引：0，他引：10
在论述某高速公路下伏砦脖煤矿采空区地质、采矿和工程地质特征的基础上, 进行了稳定性数值模拟分析, 定性与定量地分析与评价了该煤矿采空区的地表变形特征及稳定性。研究结果表明: 该煤矿采空区的变形尚未完成, 对拟建的高速公路将产生很大的危害, 必须采取相应的工程治理措施。 相似文献
17.
Dean S. Oliver 《Mathematical Geology》1998,30(7):911-933
In reservoir characterization, the covariance is often used to describe the spatial correlation and variation in rock properties or the uncertainty in rock properties. The inverse of the covariance, on the other hand, is seldom discussed in geostatistics. In this paper, I show that the inverse is required for simulation and estimation of Gaussian random fields, and that it can be identified with the differential operator in regularized inverse theory. Unfortunately, because the covariance matrix for parameters in reservoir models can be extremely large, calculation of the inverse can be a problem. In this paper, I discuss four methods of calculating the inverse of the covariance, two of which are analytical, and two of which are purely numerical. By taking advantage of the assumed stationarity of the covariance, none of the methods require inversion of the full covariance matrix. 相似文献
18.
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
19.
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
20.
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