全文获取类型
收费全文 | 2248篇 |
免费 | 1090篇 |
国内免费 | 519篇 |
专业分类
测绘学 | 25篇 |
大气科学 | 12篇 |
地球物理 | 613篇 |
地质学 | 2843篇 |
海洋学 | 97篇 |
天文学 | 1篇 |
综合类 | 202篇 |
自然地理 | 64篇 |
出版年
2024年 | 16篇 |
2023年 | 65篇 |
2022年 | 120篇 |
2021年 | 164篇 |
2020年 | 163篇 |
2019年 | 148篇 |
2018年 | 145篇 |
2017年 | 119篇 |
2016年 | 139篇 |
2015年 | 137篇 |
2014年 | 203篇 |
2013年 | 179篇 |
2012年 | 196篇 |
2011年 | 198篇 |
2010年 | 185篇 |
2009年 | 196篇 |
2008年 | 158篇 |
2007年 | 163篇 |
2006年 | 136篇 |
2005年 | 124篇 |
2004年 | 119篇 |
2003年 | 107篇 |
2002年 | 91篇 |
2001年 | 79篇 |
2000年 | 95篇 |
1999年 | 61篇 |
1998年 | 56篇 |
1997年 | 47篇 |
1996年 | 36篇 |
1995年 | 28篇 |
1994年 | 35篇 |
1993年 | 33篇 |
1992年 | 31篇 |
1991年 | 19篇 |
1990年 | 12篇 |
1989年 | 14篇 |
1988年 | 15篇 |
1987年 | 7篇 |
1986年 | 5篇 |
1985年 | 4篇 |
1982年 | 1篇 |
1978年 | 4篇 |
1977年 | 1篇 |
1976年 | 1篇 |
1974年 | 1篇 |
1971年 | 1篇 |
排序方式: 共有3857条查询结果,搜索用时 15 毫秒
91.
声波钻进是在各种覆盖层中采集连续岩心样品的有效手段。叙述了声波钻进技术的发展情况、工作原理、设备操作、优越性和用途,并且对我国研发此项技术提出了建议。 相似文献
92.
针对目前地热井施工技术现状及地热井使用中常见的问题,进行了较为详细的分析和研究,并就今后发展方向和建议进行了初步探讨。 相似文献
93.
94.
格尔木井水温异常特征及其与地震关系分析 总被引:1,自引:1,他引:1
简要介绍了格尔木井水温动态观测的环境与条件,在研究正常动态特征和影响因素的基础上,对水温异常的映震关系进行了分析,并成功地进行了一次短临地震趋势预测。探讨了水温异常的形成原因。 相似文献
95.
HU Baoqun LU Guxian WANG Fangzhang SUN Zhanxue LIU Chengdong BAI Lihong 《大地构造与成矿学(英文版)》2005,29(2):128-138
1 Introduction The pressure, a scalar quantity, is defined as P = F/S (F is force, S is the area for F) which can be widely used for both solid and fluid. The formula P = g ρh (g-gravitation acceleration,ρ-density, h-depth) is only used for even density static solid and fluid. The delivery of pressure in the fluid follows the law of Pascal, and the average pressure of uneven density fluid can be calculated with the formula of P = g ρh. The temperature influence on pressure is notHU Ba… 相似文献
96.
97.
98.
Large‐scale poroelastic fractured reservoirs modeling using the fast multipole displacement discontinuity method
下载免费PDF全文
![点击此处可从《国际地质力学数值与分析法杂志》网站下载免费的PDF全文](/ch/ext_images/free.gif)
An effective approach to modeling the geomechanical behavior of the network and its permeability variation is to use a poroelastic displacement discontinuity method (DDM). However, the approach becomes rather computationally intensive for an extensive system of cracks, particularly when considering coupled diffusion/deformation processes. This is because of additional unknowns and the need for time‐marching schemes for the numerical integration. The Fast Multipole Method (FMM) is a technique that can accelerate the solution of large fracture problems with linear complexity with the number of unknowns both in memory and CPU time. Previous works combining DDM and FMM for large‐scale problems have accounted only for elastic rocks, neglecting the fluid leak‐off from the fractures into the matrix and its influence on pore pressure and stress field. In this work we develop an efficient geomechanical model for large‐scale natural fracture networks in poroelastic reservoirs with fracture flow in response to injection and production operations. Accuracy and computational performance of the proposed method with those of conventional poroelastic DDM are compared through several case studies involving up to several tens of thousands of boundary elements. The results show the effectiveness of the FMM approach to successfully evaluate field‐scale problems for the design of exploitation strategies in unconventional geothermal and petroleum reservoirs. An example considering faults reveals the impact of reservoir compartmentalization because of sealing faults for both geomechanical and flow variables under elastic and poroelastic rocks. Copyright © 2015 John Wiley & Sons, Ltd. 相似文献
99.
In the northern Flinders Ranges, Neoproterozoic and Cambrian sedimentary rocks were deformed and variably metamorphosed during the ca 500 Ma Cambro‐Ordovician Delamerian Orogeny. Balanced and restored structural sections across the northern Flinders Ranges show shortening of about 10–20%. Despite the presence of suitable evaporitic detachment horizons at the basement‐cover interface, the structural style is best interpreted to be thick‐skinned involving basement with only a minor proportion of the overall shortening accommodated along stratigraphically controlled detachments. Much of the contractional deformation was localised by the inversion of former extensional faults such as the Norwest and Paralana Faults, which both controlled the deposition of Neoproterozoic cover successions. As such, both faults represent major, long‐lived structures which effectively define the present boundaries of the northern Flinders Ranges with the Gawler Craton to the west and the Curnamona Craton to the east. The most intense deformation, which resulted in exhumation of the basement along the Paralana Fault to form the Mt Painter and Babbage Inliers, coincides with extremely high heat flows related to extraordinarily high heat‐production rates in the basement rocks. High heat flow in the northern Flinders Ranges suggests that the structural style not only reflects the pre‐Delamerian basin architecture but is also a consequence of the reactivation of thermally perturbed, weakened basement. 相似文献
100.
CCSD-SK2井是一口钻穿松辽盆地白垩纪陆相沉积地层的中国大陆科学钻探井。二开段先以216mm口径钻至2806.20m,然后进行444.5mm口径扩孔。泥页岩地层大井眼钻进过程中粘土矿物含量高且易造浆,砂砾岩层渗透性强易粘卡,井壁稳定控制与钻屑携带难度大。选用了钾铵聚合物钻井液体系和聚磺钻井液体系,通过正交实验确定了钻井液配方。将钻井液控制在合适的密度、较低的失水量以及较强的封堵性,有效实现了井壁稳定;保持适当的环空返速、较高的动塑比以及定期打稠塞举砂等措施,有效实现了井眼净化。1086.45m~1147.56m与1182.74m~1256.01m井段累计收获岩心130.90m,取心率达到97.41%,平均机械钻速为0.84m/h;最终顺利钻至2806.20m。 相似文献