鄂尔多斯盆地中央古隆起东部古岩溶地貌小型沟槽的识别     

高建荣  徐旺林  郭彦如  赵振宇  刘俊榜  张延玲  张月巧 《海相油气地质》2012,17(4):34-38

鄂尔多斯盆地中央古隆起东部奥陶纪末古岩溶地貌发育,古地貌中沟槽的准确刻画识别对研究油气成藏和提高勘探成功率具有重要意义。沟槽在地震上的响应主要是槽的深度而不是宽度,当地层倾角大于5°时,沟槽的响应特征模糊;而当地层倾角小于5°时,槽的侵蚀深度在10～5 m,它的地震同相轴相位会反转。如果侵蚀深度在30～10 m,那么它的同相轴增益会增大;如果侵蚀深度大于30 m,它的同相轴会呈复波型。利用井数据和实际地质资料建立沟槽充填模型,应用全波场数值模拟技术生成叠后偏移剖面,结合地震响应特征分析,推测描述了中央古隆起东部马家沟组五段中、下组合中小型沟槽的分布。  相似文献   

XCC pile installation effect in soft soil ground: A simplified analytical model     

《Computers and Geotechnics》2014

This paper presents a simplified analytical model: the X-shaped cylindrical cavity expansion method (XCEM), which can be used to interpret and predict the displacement, stress, and excess pore pressure caused by the X-section cast in place concrete (XCC) pile installation in soft soil. Analytical solutions for the displacement and strain field are obtained with a streamlined solution, base on the strain path method (SPM). The stress and excess pore pressure can then be subsequently determined with the assumption of the elastic-perfectly plastic soil behavior. A positive agreement was found when the theoretical prediction of the displacement, stress, and excess pores pressure was compared against the field measurements. The proposed XCEM improves the conventional cavity expansion method (CEM) and offers a framework for understanding the non-circular cross-section penetrator problem, which is different from the conventional circular penetrator problem.  相似文献   

铬铁磨球的研究及应用     

张兰英 《广东海洋大学学报》1996,(1)

综述了铬铁磨球研究方面的最新成果。并对铬铁磨球的生产工艺要点、组织性能特点及应用效果进行了重点讨论。  相似文献   

A preliminary discussion on the bio-metallogenesis of Tl deposits in the low-temperature minerogenetic province of southwestern China     

ZHANG Zhong  ZHANG BaoGui  HU Jing  YAO LinBo & TIAN YiFu The Key Laboratory of Ore Deposit Geochemistry  Institute of Geochemistry  Chinese Academy of Sciences  Guiyang  China 《中国科学D辑(英文版)》2007,50(3):359-370

Starting with the research status of bio-metallogenesis of Tl deposits and their geology, this work deals with the geological background of Tl enrichment and mineralization and the mechanism of bio- metal-logenesis of Tl deposits, as exemplified by Tl deposits in the low-temperature minerogenetic province. This research on the bio-metallogenesis of Tl deposits is focused on the correlations between bio-enrichment and Tl, the enrichment of Tl in micro-paleo-animals in rocks and ores, bio-fossil casts in Tl-rich ores, the involvement of bio-sulfur in minerogenesis and the enrichment of bio-genetic organic carbon in Tl ores. Thallium deposits have experienced two ore-forming stages: syngenetic bio- en-richment and epigenetic hydrothermal reworking (or transformation). Owing to the intense epigenetic hydrothermal reworking, almost no bio-residues remain in syngenetically bio-enriched Tl ores, thereby the Tl deposits display the characteristics of hydrothermally reoworked deposits.  相似文献   

鄂尔多斯盆地中东部奥陶系储层控制因素分析     

李振宏赵小明  郑聪斌 《华东地质学院学报》2004,27(4):315-321

鄂尔多斯盆地中东部奥陶系呈现出宽缓的盆缘含硬石膏白云岩坪与盆缘硬石膏白云岩坪相带，为孔洞型储层的成层发育、大面积展布创造了良好的条件。中部地区储层物性明显好于东部地区。本文从古岩溶地貌、古沟槽展布、压释水分布以及孔洞充填物类型的差异，系统分析了储层分布的控制因素。进而利用电子探针分析、同位素分析及包裹体测温，探讨了孔隙充填物的类型及形成环境。充填物中的白云石主要包括微成水微晶白云石、淡水白云石及马鞍状白云石三种类型，方解石主要包括微咸水粉细晶方解石、淡水方解石及铁方解石三种类型。微咸水微晶白云石和微成水粉细晶方解石主要形成于同生期层间岩溶发育期，淡水白云石及淡水方解石主要形成于裸露期风化壳岩溶发育期，马鞍状白云石及铁方解石主要形成于中深埋藏环境。  相似文献   

Evaluation of the long term groundwater pollution by the open cast lignite mine Jänschwalde (Germany)     

Wolfgang Rolland  Hella Wagner  Robert Chmielewski  Uwe Grünewald 《Journal of Geochemical Exploration》2001,73(2):307

The reconstruction of the hydrogeochemical composition of the dumps in the active Lusatian lignite mining region is necessary to forecast the acid mine drainage into the residual lakes and the natural groundwater systems. Therefore, a three-dimensional geochemical model of the Jänschwalde dump was developed. By analysing the geological situation and the mining technology, it is possible to calculate the pyrite oxidation in different parts of the mine (groundwater lowering in front of the mine, natural and dump slopes, marginal pits and the dump surface).Only 4% of the total pyrite content is oxidised during the mining process within its time of operation (43 years). The major fraction (about 60%) is oxidised on the surface of the dumps, whereas the other zones contribute less to the production of acidity (groundwater lowering 5.4%, short term exposed slopes (1.2% natural slopes; 7.4% dump slopes) and 22.4% inclusion of O₂ during the tipping). It may be concluded that the technology of conveyor belt bridges, combined with the selective tipping of loamy sediments on the surface is very favourable to minimise the oxidation of pyrite. It is also shown that in the open cast mine of Jänschwalde the buffer capacity of the carbonate dominates over the produced acid.  相似文献   

山东蒙山九龙潭冰川堆积“垄槽序列”的特征及演化过程研究——兼论冰川、泥石流堆积序列的差异性     

王照波  王江月  何乐龙  张剑  赵向阳  李宝杰 《地质力学学报》2021,27(1):105-116

中国东部中低山区是否存在第四纪冰川已经争议了一个世纪，作为东部地区冰川堆积重要依据的"泥砾"（冰碛），一直被持非冰川观点者称作是泥石流沉积物。但是，由于冰川与泥石流的堆积过程之间存在本质差别，这必然在堆积体的特征上表现出专属性差异。因此建立冰川与泥石流在堆积特征与堆积过程上的专属性差异，在冰碛物的成因分析、冰碛堆积过程恢复上就有着重要意义。文章在对比分析了冰川堆积与泥石流堆积的过程差异的基础上，发现两类堆积体在平面与剖面上都存在明确的专属性差别。冰川冰碛在平面上形成专属性的垄槽序列，剖面上显示为无层理、混杂堆积状态。泥石流形成堆积扇，扇面上呈放射状垄岗堆积，剖面上表现为韵律序列。这是区别冰川与泥石流堆积体的本质所在。在此基础上，对蒙山九龙潭一带混杂堆积体进行调查与恢复，发现其具有典型的冰川成因垄槽序列特征，结合其剖面上表现为无层理、混杂堆积特征，从沉积序列与沉积过程的角度，佐证了蒙山九龙潭混杂堆积为第四纪冰川作用的事实。垄槽序列既是堆积物是否为冰川作用属性判断的专属性特征，也是恢复冰碛堆积体基本地貌特征与堆积过程的理论基础。   相似文献   

大连地区某些石英岩底面的类似沟模,槽模现象     

彭丽君 《岩石矿物学杂志》1995,14(3):226-229

笔者在从事地质教学和地质录像过程中，于１９８８年在浅水沉积的砂岩底面发现了类似沟模、槽模现象，与国内沉积岩石学教科书引用的国外沟模、槽模实便有两点不同之处：①所见沟模是水流冲刷模而不是工具压刻模；②所见沟模、槽模下伏沉积物质是砂质的而不是泥质的。该现象的发现是对沟模、槽模现象的补充和完善，对探讨沟模槽模、的成因及填补国内沉积岩石学教科书缺少的国内沟模、槽模实例的空白很有意义。  相似文献   

碳酸盐岩铸体薄片面孔自动提取研究     

杜相仪  董少群  曾联波  何娟  孙福亭 《地质论评》2021,67(4):67050007-67050007

岩石孔隙是储层储集油气的重要场所,通过铸体薄片进行岩石孔隙结构分析对储层质量评价具有重要意义。碳酸盐岩孔隙结构较为复杂,铸体薄片图像中存在大量噪声和干扰因素,致使常规方法面孔提取效果不佳,因此本文引入一种多阈值铸体薄片面孔自动提取方法（ctsPore方法）进行孔隙区域提取和面孔率估计,方法综合利用HSV色彩空间中不同参数提取孔隙区域。本文针对碳酸盐岩储层的特点确定了一套ctsPore阈值参数,以解决溶蚀孔与噪声易混淆的问题。实验以伊拉克A油田中新统 Asmari组A段碳酸盐储层为例对所使用算法进行了效果检验。算法精度和效率分析实验表明,基于ctsPore方法的碳酸盐岩铸体薄片面孔提取误差小于0.24%。全井段铸体薄片分析结果表明,A段储层面孔率范围主要分布在6%~8%,储层较为致密,从上到下A1~A3小层的储层平均面孔率分别为6. 9%、11.7%、5.4%,与储层物性、沉积微相和岩性等纵向分布规律较为吻合。  相似文献   

深厚松散地层泄压槽治理井筒破坏判据及其与地下水水位关系     

潘维强  张黎明  丛宇 《吉林大学学报(地球科学版)》2021,51(5):1578-1586

为了解决深厚松散地层预防性治理后竖井井筒缺乏破坏判据问题,用数值极限应变方法分析井筒应变值的变化情况,将井筒中达到极限应变值的单元环向贯通,计算不收敛作为井筒整体破坏判别标准。分别建立了带卸压槽和无卸压槽井筒的数值计算模型,得出地下水水位下降诱发的井筒和周围岩土体的极限应变值。结果表明,井筒周围砂土层先于井筒在181~183 m发生破坏：若地下水水位下降27 m,无泄压槽井筒在181~182 m发生破坏;若地下水水位下降38 m,带卸压槽井筒在182~183 m发生破坏。目前地下水水位下降为20 m,井筒处于安全状态。数值计算卸压槽压缩量与实际监测值一致。  相似文献