潍北凹陷次级构造带孔三段火山岩油气成藏条件对比研究          下载免费PDF全文

孙耀庭徐守余张世奇刘金华 《地质科学》2017,(3):818-836

潍北凹陷是郯庐断裂带内部典型的走滑拉分盆地,火山岩发育在古近系孔三段。通过对该区火山岩油气藏成藏要素研究,认为孔二中上亚段油页岩和灰质泥岩为主力烃源岩;遭受强烈风化作用的溢流旋回上部亚相为主要储集层,储集空间以裂缝-孔隙型为主;断距较大的反向断块与两套主力烃源岩直接对接,形成良好的圈源配置;断层和风化壳形成的输导网络提供了有利的运移条件;孔二中下亚段暗色泥岩提供了良好的盖层条件。根据潍北凹陷孔三段火山岩油气藏成藏特征,总结出3 种成藏模式,即北部洼陷带近源相控成藏模式、灶户断鼻带断鼻带中源断-相双控成藏模式和南部斜坡带远源断控成藏模式,灶户断鼻带和南部斜坡带是有利成藏区。  相似文献   

塔东地区下古生界天然气成藏主控因素及勘探领域   总被引：1，自引：0，他引：1  

刘卫红  高先志  叶信林  冉启贵  程宏岗 《海相油气地质》2017,22(4)

利用岩心、分析化验及地球物理资料对塔东地区下古生界烃源岩和储集层进行了综合分析。研究认为寒武系—奥陶系烃源岩已处于高—过成熟阶段,原油裂解气是主要气源,并圈定裂解气有效供气范围主要集中在古城以北的地区。储层主要为颗粒灰岩和白云岩,颗粒灰岩的孔隙类型主要为裂缝及与之伴生的溶蚀孔洞,分布在古城台地边缘带和罗西台地边缘带的奥陶系中;白云岩主要发育溶蚀孔,在塔东地区广泛分布。结合区域构造演化史分析,指出古城鼻隆及其西北地区是最有利的勘探区带,其次为英东构造带及满加尔凹陷、英吉苏凹陷内的其他隆起区。  相似文献   

文山杨柳井铝土矿矿床成因及找矿标志   总被引：1，自引：0，他引：1  

缪鹰 《云南地质》2009,28(3):291-294

铝土矿产于第四系残坡积层中,属堆积型,分布于大塘组及威宁组形成的溶蚀漏斗及洼地中。讨论矿床成因及找矿标志。  相似文献   

羌塘盆地构造特征及油气远景初步分析   总被引：25，自引：3，他引：22       下载免费PDF全文

黄继钧  伊海生  林金辉 《地质科学》2004,39(1):1-10

羌塘盆地为一大型沉积盆地,基底为双层结构,基底构造具两坳夹一隆及断凸断凹特征。盆地盖层由中泥盆统—第三系组成,盖层中褶皱、断裂发育,具分带性,主变形期为燕山—喜马拉雅期。盆地经历长期演化,早期为拉张型盆地、晚期为挤压型盆地。盆地生油条件良好,具多种构造圈闭和良好盖层,构造圈闭形成时间与烃源岩排烃时间基本同步,具有良好的油气成藏条件。  相似文献   

Heavy metal removal efficiencies in a river–marsh system estimated from patterns of metal accumulation in sediments     

T. F. Rozan  G. Benoit 《Marine environmental research》1999,48(4-5)

Estuaries have long been thought to be effective traps for river-borne contaminants; however, accurately predicting removal efficiencies remains problematic. In the Quinnipiac River, CT, marsh system, patterns of metal accumulation (Ag, Cd, Cu, Pb) in sediments were used to estimate heavy metal removal efficiencies. Linear and multivariate regression models were fit to sediment metal concentrations to estimate removal curves and surfaces, which avoided the large temporal variability commonly encountered when using direct water column measurements. Second order regressions normalized to the shortest distance to the river channel were found to have the best fit (r>0.67) with the lowest standard error (<32%). The heavy metal removal efficiencies estimated by comparing total metal accumulation in marsh sediments with riverine flux were Ag=21%, Cd=6%, Cu=14%, and Pb=17%, which are comparable to the maximum removal efficiency of riverine suspended particulate matter (28%).  相似文献   

Bioindication of Gold by Aquatic Bryophytes     

A. Samecka-Cymerman  A. J. Kempers 《洁净——土壤、空气、水》1998,26(2):90-94

As arsenopyrite is frequently present in auriferous deposits, concentrations of gold were measured in aquatic bryophytes collected from streams in zones of arsenic mineralization in the Polish and Czech Sudety Mountains. Data were compared with analyses of aquatic bryophytes from streams in non As mineralization areas with only background concentrations of Au. The highest contents of Au in bryophytes surpass the background concentration of this element in plants and are found in areas characterized by the presence of arsenopyrites.  相似文献   

Climatic and eustatic signals in a global compilation of shallow marine carbonate accumulation rates     

David B. Kemp  Peter M. Sadler 《Sedimentology》2014,61(5):1286-1297

Two of the most important factors that control the accumulation rate of material in carbonate platform environments on geological time scales are climate and eustasy. Accurately assessing the importance of these inter‐related factors through the study of both modern and ancient carbonate facies, however, is problematic. These difficulties arise from both the complexities inherent in carbonate depositional systems and the demonstrable incompleteness of the stratigraphic record. Here, a new compilation of more than 19 000 global Phanerozoic shallow marine carbonate accumulation rates derived from nearly 300 individual stratigraphic sections is presented. These data provide the first global holistic view of changes in shallow marine carbonate production in response to climate and eustasy on geological time scales. Notably, a clear latitudinal dependence on carbonate accumulation rates is recognized in the data. Moreover, it can also be demonstrated that rates calculated across the last glacial maximum and Holocene track changes in sea‐level. In detail, the data show that globally averaged changes in carbonate accumulation rates lagged changes in sea‐level by ca 3 kyr, reflecting the commonly observed delay in the response of individual carbonate successions to sea‐level rise. Differences between the rates of carbonate accumulation and sea‐level change over the past 25 kyr ostensibly reflect changing accumulation mode, with platform drowning (give‐up mode) pervasive during peak Early Holocene sea‐level rise, followed by a switch to catch‐up mode accumulation from ca 9 ka to the present. Carbonate accumulation rates older than the Quaternary are typically calculated over time spans much greater than 100 kyr, and at these time spans, rates primarily reflect long‐term tectonically mediated accommodation space changes rather than shorter term changes in climate/eustasy. This finding, coupled with issues of stratigraphic incompleteness and data abundance, tempers the utility of this and other compilations for assessing accurately the role of climate and eustasy in mediating carbonate accumulation rates through geological time.  相似文献   

准噶尔盆地腹部陆梁油田侏罗系-白垩系成藏模拟研究   总被引：1，自引：0，他引：1       下载免费PDF全文

刘刚  张义杰  姜林 《地质科学》2014,49(4):1314-1326

为明确陆梁油田储集层排驱压力对油气成藏及分布的影响作用,基于油田地质条件及成藏模式,设计实验模型,运用成藏物理模拟方法,模拟断层输导下的油气成藏过程,观察现象、 分析结果,揭示了陆梁油田不同储盖组合成藏性能受排驱压力控制,即在注入一定压力下,与断层对接储集层排驱压力较小的储盖组合优先成藏,且含油饱和度较高;与断层对接排驱压力较大的储盖组合成藏较晚难度较大,含油饱和度较低。未与断层对接的储集层,无论其排驱压力大小,均难以成藏。物理模拟实验再现了陆梁油田侏罗系-白垩系成藏过程。  相似文献   

云南勐海关双铁矿矿床成因     

王爱萍  高李阳  张吉寿 《云南地质》2011,30(2):160-163

关双铁矿位于大南婆—惠民—西定金多金属矿富集区。矿床成因与澜沧惠民铁矿类似,属海相火山沉积变质型。  相似文献   

重金属Pb和Cu对Cd在泥鳅（Misgurnus anguillicaudatus）组织器官蓄积的影响          下载免费PDF全文

唐建勋  程樟顺  张婕  徐玉花  邢承华 《海洋与湖沼》2011,42(2):262-265

采用静水生物测试方法,研究了Pb（0.5mg/L）和Cu（0.1mg/L）的相互作用对Cd（0.05mg/L）在泥鳅组织器官中蓄积的影响。结果表明,重金属离子相互作用对Cd在泥鳅组织器官中蓄积的影响与重金属的种类、数量、染毒时间及组织器官性质有关,Cd在泥鳅组织器官中的蓄积顺序为肝〉肾〉肌肉。研究发现,Cd在组织器官中...  相似文献