宜川-旬邑地区长8油层组储层特征与控制因素   总被引：1，自引：0，他引：1  

田亚铭  施泽进  吴晓明  宋江海  齐亚林  高翔  洪成云 《新疆地质》2011,29(3):314-318

宜川-旬邑地区上三叠统延长组长8油层组主要为三角洲前缘沉积环境,局部发育湖底滑塌扇体.岩心观察、薄片分析、扫描电镜及压汞测试表明,长8油层组主要为长石岩屑砂岩和岩屑长石砂岩,孔隙类型以残余原生粒间孔为主,次为长石溶孔,多为片状喉道和弯片状喉道,孔隙结构以小孔隙-微喉-细喉型与细孔隙-微喉-细喉型为主,储层非均质性强,水下分流河道、河口坝储层物性最好,分支水道最差,绿泥石环边胶结成岩相及石英次生加大胶结成岩相为有利成岩相,压实和胶结作用分别损失的孔隙度为25.65%和3.31%,溶蚀作用整体新增0.83%孔隙度,形成长8油层组目前低孔-超低孔致密砂岩储层.  相似文献   

三峡库区消落区表层沉积物磷吸附特征   总被引：2，自引：0，他引：2       下载免费PDF全文

曹琳  吉芳英  林茂  黎司  王图锦 《水科学进展》2011,22(1):89-96

以三峡库区消落区表层沉积物为研究对象,通过对干湿交替沉积物中磷的赋存形式、吸附等温曲线的分析,揭示了干湿交替过程中沉积物磷的分布规律、吸附特征以及磷的源汇变化。结果表明:上覆水总磷变化呈现11月总磷<5月总磷<8月总磷。消落区覆水到出露沉积物最大磷吸附量、土壤最大缓冲能力在增加,磷零吸持平衡浓度、易解吸磷在降低,表明沉积物在夏季出露落干的过程中,固磷能力增强,释磷能力减弱;消落区土壤首次覆水过程中土壤磷呈现出由源到汇的转变。成库初期,覆水时沉积物主要表现为磷的积累,次年水库开闸放水排沙时,消落区表层富磷沉积物被冲刷排出。  相似文献   

龙羊峡水库水温结构演变及其对下游河道水温影响   总被引：1，自引：0，他引：1       下载免费PDF全文

宋策  周孝德  辛向文 《水科学进展》2011,22(3):421-428

多年调节水库由于年际运行过程的差异引起水库水温结构变化,探明其规律及对下游河道水温响应具有重要意义。以黄河龙羊峡水库为研究对象,利用水库蓄水后的1988～2008年运行过程及水温观测资料,分析了水库运行方式与水温结构变化关系,探讨了水库不同运用过程对下游河道水温的影响。研究结果表明:龙羊峡水库水温结构演变及其对下游河道水温影响程度与水库运用过程密切相关。12～3月,水温结构为弱分层或等温分布,较高水位的蓄热增温效应明显,下游河道水温与水库水位变化具有同相位关系;5～10月,水温结构为分层分布,水位是决定分层形态变化最主要因素,下游河道水温与水库水位变化具有反相位关系,同时,水位与河道水温在不同的出入库水量条件下,呈现不同的线性相关关系。11月和4月,水温结构近乎为等温状态,也是水温结构变化的转折点。研究成果为分析大型水库在不同运行条件下水温结构及下游河道水温提供一定的参考依据。  相似文献   

鄂尔多斯盆地陕北斜坡延长区块储层流体识别     

申安斌  严云奎  李辉峰  张春灌  鲁海鸥 《陕西地质》2011,29(2):60-65

延长油田区块位于鄂尔多斯盆地陕北斜坡东部延安单斜的中间部位,为研究天然气储层及储层中高含气分布区,2008年在延长油田区块内完成三维地震勘探344km2。本文对三维地震资料应用吸收系数、频谱分解、振幅衰减等地震属性进行流体识别试验。试验结果表明振幅衰减对含气层段异常响应相对敏感,吸收系数对高含气层段有一定反映。利用天然气储层各层段振幅衰减极大值,参考吸收系数剖面的高值层段,分析预测了三维区块含气概率高的平面分布区,2009年在预测的含气概率高分布区进行了探井验证,取得了比较理想的效果。  相似文献   

确定Brooks-Corey土壤水力特性模型参数的垂直入渗方法          下载免费PDF全文

马东豪  张佳宝  黄平 《水科学进展》2011,22(2):235-241

在水平入渗方法的基础上,提出了一种不需测定饱和导水率,仅利用一维垂直入渗试验即可确定Brooks-Co-rey模型参数的新方法.利用封丘县两种质地土壤的入渗资料,对所提出的方法进行了检验.结果表明,只要入渗历时足够长,基质势和重力势作用相当,垂直入渗方法确定的土壤水力参数与水平吸渗方法的预测结果相近;利用预测的参数,数...  相似文献   

大陆下地壳麻粒岩的流变学研究进展   总被引：1，自引：0，他引：1  

李丽敏  刘祥文  谢战军 《地球科学进展》2011,26(3):275-285

大险下地壳麻粒岩的流变学研究可以解释地壳变形、壳幔物质交换以及岩石圈深部动力学过程等科学问题.前人通过研究各矿物的显微构造变形特征与变形机制,运用广义混合流变律探讨多矿物复合岩石的流变性质,结合水与流体对岩石变形强度的弱化作用,阐明在大陆下地壳变形环境下复矿麻粒岩的塑性变形和韧性流变性质.目前人们致力于对天然变形岩石和...  相似文献   

鄂尔多斯盆地旦八油田延长组长3储层研究     

许小强  赵进义  郭浩  潘翔 《云南地质》2011,30(1):115-117

三叠系延长组长3储集层灰色细粒长石砂岩储层物性差,属低孔、低渗储层.空隙以粒间孔、溶孔为主,且成岩作用控制孔隙结构.根据岩性、物性特征,把研究区储层分为四类:Ⅰ类好储集层,Ⅱ类较好储集层,Ⅲ类较差储集层,Ⅳ类非储层.  相似文献   

华庆地区延长组长6油层组储集砂岩特征及对储层物性的影响          下载免费PDF全文

苏楠  隆昊  田景春  王卫红  张锦泉 《沉积与特提斯地质》2011,31(1):65-71

长6油层组储集砂岩主要为岩屑长石砂岩,粒度较细,分选中等偏差,填隙物主要为碳酸盐矿物和粘土矿物。砂岩的物质组成影响着其储层性能,储层物性随着石英含量的增加而变好,而随着岩屑含量的增加而变差。砂岩中长石的溶蚀作用是改善储层物性的关键因素。填隙物的含量越大,则孔隙喉道堵塞和充填的程度增加,导致储层物性变差。  相似文献   

More than just access to fish: The pros and cons of fisher participation in a customary marine tenure (Padu) system under pressure     

Sarah Coulthard 《Marine Policy》2011

The Padu system of South Asia has received growing attention as an example of customary marine tenure that has survived despite rapid development and change throughout the region’s fisheries. This paper describes the Padu system as it functions at Pulicat lagoon, India, where it has enjoyed decades of legitimacy amongst its members, and has contributed to sustainable fishing. Recently, however, the Padu system has become unstable, driven by pressures of an expanding fishing population, reduced access to fishing grounds and a growing ‘shared poverty’. In spite of this, fisher loyalty to uphold the Padu system remains strong. This raises questions about the broader social, political and cultural meanings of Padu, which extend beyond access to a lucrative fishery. The paper highlights a trade-off between the benefits received through Padu membership at a societal level through collective action, and the individual costs of partaking in ‘shared poverty’, which is inherently distributed unequally amongst fishing families. The paper concludes with a discussion on the future of the Padu system in Pulicat, drawing from evolutionary pathways of other Padu systems in the region. It is suggested that, in the Pulicat case, the high social values attributed to the Padu system, alongside complex power structures, may hinder institutional adaptation.  相似文献   

3-D internal architecture of methane hydrate-bearing turbidite channels in the eastern Nankai Trough, Japan     

Satoshi Noguchi  Naoyuki Shimoda  Osamu Takano  Nobutaka Oikawa  Takao Inamori  Tatsuo Saeki  Tetsuya Fujii 《Marine and Petroleum Geology》2011,28(10):1817-1828

The reservoir architecture of methane hydrate (MH) bearing turbidite channels in the eastern Nankai Trough, offshore Japan is evaluated using a combination of 3-D seismic and well data. On the 3-D seismic section, the MH-bearing turbidite channels correspond to complex patterns of strong seismic reflectors, which show the 3-D internal architecture of the channel complex. A seismic-sequence stratigraphic analysis reveals that the channel complex can be roughly classified into three different stages of depositional sequence (upper, middle, and lower). Each depositional sequence results in a different depositional system that primarily controls the reservoir architecture of the turbidite channels. To construct a 3-D facies model, the stacking patterns of the turbidite channels are interpreted, and the reservoir heterogeneities of MH-bearing sediments are discussed. The identified channels at the upper sequence around the β1 well exhibit low-sinuosity channels consisting of various channel widths that range from tens to several hundreds of meters. Paleo-current flow directions of the turbidite channels are typically oriented along the north-northeast-to-south-southwest direction. High-amplitude patterns were identified above the channels along the north-to-south and north-northeast-to-south-southeast directions. These roughly coincide with the paleo-current flow of the turbidite channels. An interval velocity using high-density velocity analysis shows that velocity anomalies (>2000 m/s) are found on the northeastern side of the turbidite channels. The depositional stage of the northeastern side of the turbidite channels exhibits slightly older sediment stages than the depositional stages of the remaining channels. Hence, the velocity anomalies of the northeastern side of the channels are related to the different stages of sediment supply, and this may lead to the different reservoir architectures of the turbidite channels.  相似文献