塔里木盆地哈得逊油田东河砂岩油藏原油特征和倾斜油-水界面成因初探   总被引：1，自引：0，他引：1       下载免费PDF全文

徐汉林  江同文  顾乔元  牛玉杰  张秋茶 《地质科学》2009,44(1):338-346

塔里木盆地哈得逊油田东河砂岩油藏内部存在着由北向南原油密度等物性呈现规律变化的特征.西北部的"重质油"（密度>0.34 g/cm³）与中-南部的"轻质油"（密度<0.34g/cm³）来源于同一套烃源岩,但原油族组成、原油成份等方面的特征存在着较大的差别.东河砂岩油藏的原油可能不是直接来自于烃源岩,而是来源于古油藏,原油物性的差异是晚喜马拉雅运动导致晚海西期形成的古油藏发生调整并在运移过程中造成的成份分异等原因所致.哈得逊鼻隆构造高点至今仍在迁移,东河砂岩油藏正处于充注、调整之中,导致了其油-气-水界面的大幅度倾斜.  相似文献   

应用先进微波探测器AMSU资料遥感反演春季陆地表层湿度   总被引：2，自引：0，他引：2  

谷松岩  邱红  杨忠东  董超华 《气候与环境研究》2004,9(1):43-53

利用先进微波探测器(AMSU)正演快速微波辐射传输模型,完成了AMSU 窗区通道亮温与地表温湿特征的相关性分析,根据模拟计算结果改进了现有业务上反演地表微波辐射率的统计分析方法,得到适用于我国非冻土积雪覆盖地区地表微波辐射率反演的指数分析模型;进一步通过地表微波辐射传输模型迭代反演得到土壤体积含水量信息.2001年相互匹配的AMSU资料和地面农业气象观测站地表相对湿度观测结果的对比分析表明二者间具有一定的相关性.利用2002年3月和2003年3月的AMSU资料,反演了我国陆地区域地表湿度;连续两年春季地表湿度反演结果的对比分析表明,与2002年春季相比,2003年我国北方沙尘暴发生源区地表湿度反演值普遍偏高,潮湿的下垫面特征与沙尘暴发生频次的减少之间有一定的对应关系.试验结果表明,利用AMSU遥感资料可以获取大范围陆地表层湿度信息,进行区域尺度陆地表层湿度特征的动态分析,为我国沙尘暴监测分析提供陆地表层湿度基础信息.  相似文献   

甘肃阿克塞县安南坝地区镁铁质麻粒岩锆石U-Pb年龄和Hf同位素组成:对塔里木东南缘前寒武纪地质演化的启示          下载免费PDF全文

辜平阳  徐学义  何世平  赵惠博  庄玉军  查显锋  陈锐明  郭亚鹏 《地质科学》2019,54(2):549-570

甘肃阿克塞县安南坝地区镁铁质麻粒岩呈脉状或透镜状赋存于新太古代米兰岩群和TTG片麻岩中。岩石主要由斜方辉石（Opx）+单斜辉石（Cpx）+角闪石（Amp）+斜长石（Pl）+磁铁矿（Mt）等组成,具有典型中-低压麻粒岩相岩石的矿物组合特征。LA-ICP-MS锆石U-Pb测年结果显示镁铁质麻粒岩原岩形成时代可能为2 561±29 Ma,与塔里木东南缘2.6～2.5 Ga岩浆作用时代基本一致,说明新太古代晚期是塔里木东南缘重要的陆壳增生期。此外,通过测年还获得了～1.95 Ga、～1.86 Ga两期变质年龄。其中,～1.95 Ga的峰期变质年龄是塔里木克拉通东南缘古元古代晚期强烈构造—热事件的地质记录。～1.86 Ga的变质年龄可能与该地区古元古代末期构造—岩浆事件密切相关。镁铁质麻粒锆石¹⁷⁶Hf/¹⁷⁷Hf比值均＜0.281 621,ε_Hf(t) 值为-14.08～3.12,两阶段模式年龄（T_DM2）主要集中在～2.65 Ga,指示其原岩岩浆起源于新太古代富集岩石圈地幔。  相似文献   

北大别罗田榴辉岩的减压出溶结构与超高压变质作用   总被引：1，自引：0，他引：1       下载免费PDF全文

刘贻灿  古晓锋  陈振宇 《地质科学》2009,44(1):202-212

岩石学研究表明北大别罗田榴辉岩经过了榴辉岩相、麻粒岩相和角闪岩相变质作用,表现出多种减压出溶结构.特征性的减压出溶结构有单斜辉石和石榴石中分别发育石英+角闪石+斜长石等与金红石+单斜辉石+角闪石等针状矿物出溶体,以及锆石中含有柯石英残晶.这些进一步证明北大别南部（罗田一带）同北部（如黄尾河、百丈岩等地）榴辉岩一样经过了>5～7CPa的超高压变质作用.  相似文献   

The missing half of the subduction factory: shipboard results from the Izu rear arc,IODP Expedition 350     

Cathy J. Busby  Yoshihiko Tamura  Peter Blum  Gilles Guèrin  Graham D. M. Andrews  Abigail K. Barker 《International Geology Review》2017,59(13):1677-1708

IODP Expedition 350 was the first to be drilled in the rear part of the Izu-Bonin, although several sites had been drilled in the arc axis to fore-arc region; the scientific objective was to understand the evolution of the Izu rear arc, by drilling a deep-water volcaniclastic section with a long temporal record (Site U1437). The Izu rear arc is dominated by a series of basaltic to dacitic seamount chains up to ~100-km long roughly perpendicular to the arc front. Dredge samples from these are geochemically distinct from arc front rocks, and drilling was undertaken to understand this arc asymmetry. Site U1437 lies in an ~20-km-wide basin between two rear arc seamount chains, ~90-km west of the arc front, and was drilled to 1804 m below the sea floor (mbsf) with excellent recovery. We expected to drill a volcaniclastic apron, but the section is much more mud-rich than expected (~60%), and the remaining fraction of the section is much finer-grained than predicted from its position within the Izu arc, composed half of ashes/tuffs, and half of lapilli tuffs of fine grain size (clasts <3 cm). Volcanic blocks (>6.4 cm) are only sparsely scattered through the lowermost 25% of the section, and only one igneous unit was encountered, a rhyolite peperite intrusion at ~1390 mbsf. The lowest biostratigaphic datum is at 867 mbsf (~6.5 Ma), the lowest palaeomagnetic datum is at ~1300 mbsf (~9 Ma), and the rhyolite peperite at ~1390 mbsf has yielded a U–Pb zircon concordia intercept age of (13.6 + 1.6/?1.7) Ma. Both arc front and rear arc sources contributed to the fine-grained (distal) tephras of the upper 1320 m, but the coarse-grained (proximal) volcaniclastics in the lowest 25% of the section are geochemically similar to the arc front, suggesting arc asymmetry is not recorded in rocks older than ~13 Ma.  相似文献   

Hydrochemistry,multidimensional statistics,and rock mechanics investigations for Sanshandao Gold Mine,China     

Hongyu Gu  Fengshan Ma  Jie Guo  Kepeng Li  Rong Lu 《Arabian Journal of Geosciences》2017,10(3):62

Prediction of bursting water in a submarine mine (Sanshandao Gold Mine) is very important. The aim of this study was to understand the water sources, mixing ratios, and flow paths in a mining region by using hydrochemistry, principal component analysis (PCA), and rock mechanics. Field observations reveal that there are unusual geothermal gradients and complicated geological conditions. Samples collected from the surface and every depth of the tunnel were analyzed for various ions and isotopes (¹⁸O and D). PCA was used to identify the most likely water sources on the foundation of hydrochemistry and a conceptual model. Four kinds of water sources were identified: (1) water mixture of surface freshwater and seawater, (2) brine derived from a deep closed environment, (3) thermal brine derived from the northwestern fault (F3), and (4) Quaternary water. The water sources were variable with time at a sampling site. The combination of water sources in a specific sampling campaign can be decided by the positive scores on principal components (PCs). The PCA results indicate that the first and the fourth kind of water source appear in the deep tunnel with the continual mining activity. Mixing ratio calculations for each sampling campaign show that the first and the fourth kind of water source constitute a small proportion of the total water. The main water sources are the second and third kinds of water. Finally, water flow paths were determined based on the PCA, and rock mechanics is used to explain the change in the water flow paths after excavation. The results show the following: (1) There are several strong water diversion zones that distribute at a certain spacing interval on the large scale and (2) “zonal disintegration” is also found in the tunnel. The fractured zone and the non-fractured zone appear in turn around the tunnel. The rock mass in these two zones represents the tensile and compressive properties, respectively. Thus, volumes of water and permeability of joints and fractures in these two zones are great different.  相似文献   

内蒙古双尖子山银多金属矿床花岗斑岩年代学、地球化学特征及构造意义   总被引：2，自引：0，他引：2  

顾玉超 《地质与勘探》2017,53(3):495-507

本文对内蒙古双尖子山银多金属矿床花岗斑岩进行了锆石SHRIMP U-Pb定年,并对花岗斑岩的主量元素、微量元素组成进行了分析研究。结果显示,双尖子山花岗斑岩加权平均年龄为(133.4±1.2)Ma,为大兴安岭南段早白垩世岩浆活动集中期产物;花岗斑岩SiO_2含量为68.81%~70.05%,低MgO、TiO_2,K_2O/Na_2O为0.97~1.27,较为富钾;A/CNK在0.94~1.12之间,属准铝-弱过铝系列;富集Rb、Th、U、K等大离子亲石元素(LILE),亏损Sr、P、Ti等高场强元素(HFSE);稀土总量ΣREE中等,δEu为0.55~0.62,Eu中等负异常。本文认为双尖子山银多金属矿床为多期次叠加的岩浆热液型矿床,160Ma和133Ma可能分别是岩浆活动的两个高峰期。花岗斑岩形成于陆内晚造山期-造山期后的伸展环境,蒙古-鄂霍次克洋俯冲板片在深部断离,引发软流圈物质上涌,这是导致大兴安岭南段早白垩世岩石圈伸展环境的主要机制。  相似文献   

鄂尔多斯盆地黄陵地区长6油层组流体过剩压力与油气运移研究     

雷俊杰  吴颖 《江苏地质》2017,41(4):542-547

随着鄂尔多斯盆地黄陵地区油气勘探的不断推进,加深长6油层组石油运移、成藏的认识对指导进一步的勘探开发十分必要。通过对黄陵地区延长组流体过剩的计算,以及运移通道、运移方向和长 6油藏形成时油气运移特征的研究结果表明,黄陵地区长7油层组具有远大于长6油层组的过剩压力分布,两者之间过剩压力差平均为344 MPa,过剩压力差值为长 7 油气向长6 油层组储层运移的主要动力。油气从长7烃源岩排出后,在过剩压力驱动下沿通道体系向优质砂体展布上倾方向孔隙剩余压力的减小方向运移,遇到合适的圈闭聚集成藏。  相似文献   

Compositional dual mesh method for single phase flow in heterogeneous porous media—application to CO<Subscript>2</Subscript> storage     

Dominique Guérillot  Jérémie Bruyelle 《Computational Geosciences》2017,21(5-6):949-961

Numerical simulation of fluid flow coupled with chemical reactions has been an active field in the hydrogeology community and many formulations have been programmed into different software. In recent years, this subject has attracted increasing interest in the reservoir simulation community, partly for the application of chemical methods for hydrocarbon extraction but also for research on the geological sequestration of CO₂. In this paper, an extension to the concept of dual mesh for reactive transport modeling is presented. This approach involves two meshes, a low-resolution mesh to resolve the pressure equation and a high-resolution mesh to transport the species and to calculate the geochemical equilibrium. The main objective is to preserve the fine scale heterogeneities to reach a more accurate field behavior simulation than conventional approach which consist in performing simulations on a coarser mesh. The method is applied to a simulation of CO₂ storage in the SPE10 model that keep a high resolution of the heterogeneities.  相似文献   

Understanding the triggering mechanism and possible kinematic evolution of a reactivated landslide in the Three Gorges Reservoir   总被引：2，自引：0，他引：2  

Dong Ming Gu  Da Huang  Wei Dong Yang  Ji Liang Zhu  Guo Yang Fu 《Landslides》2017,14(6):2073-2087

More than 5000 landslides or potential landslides have been induced in the Three Gorges Reservoir (TGR) region since the impoundment in 2003, which have caused great damage and remain a huge threat to the dam and people living in the reservoir area. Understanding the deformation characteristics and failure mechanism of the landslides can be helpful in stability evaluation and landslide prediction. The primary aim of this study is to research the characteristics of the landslide motion and its relationships with environmental triggers, taking the Quchi landslide, a large, slow-moving, reactivated landslide in the TGR region, as an example. The instability clearly showed visible signs of movements since 2002, and after that, the slope has been experiencing persistent deformation. By combining 4 years of meteorological, hydrological data with displacement measurements from open fractures, deep boreholes, and surface points, as well as in situ observations, this paper reports the geological and geotechnical investigations performed to define the movement. The deformation is believed to be governed by reservoir water levels, while the precipitation has a minor effect. Seasonally, the slope movement has a very distinctive pattern with large deformation starting abruptly right after reservoir drawdown in June and lasting into late summer (September). Then there is a rapid transition to constant deformation (almost no displacement) as the reservoir level rises. The slope displacements appear to gradually increase every year, which suggests very high possibility of the large and overall failure of the slide. Both monitoring results and geomorphological observations have highlighted that the two active slide masses Q1 and Q2 would probably collapse in different kinematic evolution modes, i.e., the multistage failure and whole sliding motion.  相似文献