特低渗裂缝性砾岩油藏储层特征及其对开发效果控制作用研究:以克拉玛依油田八区下乌尔禾油藏为例   总被引：1，自引：0，他引：1       下载免费PDF全文

徐怀民  阴国锋 《地学前缘》2012,19(2):121-125

在岩心储层研究及测井解释的基础上,动静结合确定了八区下乌尔禾组油藏的有效储层划分标准,在此基础上,运用综合评价方法将储层划分为4类,其中I类最好,IV类最差。对比四次加密试验井,储层评价效果好,储层厚度的预测误差率在5%以内,储层类型符合率为80%。统计岩心及成像测井资料显示,下乌尔禾组天然裂缝以构造高角度缝为主,人工裂缝以压裂羽状缝为主,各类裂缝多为闭合缝。结合开发动态资料分析认为:储层发育优势区控制了油井高产区,油层储层条件越好,初期产能越高;裂缝的存在导致注入水优先沿裂缝突进,使油井出现裂缝水窜、见水不见效等开发特征;综合分析发现油水井的驱替通道、储层及裂缝发育情况导致油井不同见效情况。在静动态研究基础上实施的四次加密试验井,90%以上的井可达到预期设计产能。  相似文献   

Molar‐Tooth Structure from the Mesoproterozoic Wumishan Formation in Lingyuan,Yanshan Region,North China,and Geological Implications   总被引：1，自引：0，他引：1  

KUANG Hongwei  LIU Yongqing  PENG Nan  LUO Shunshe  LI Jiahu  CEN Chao  CHEN Mingpei 《《地质学报》英文版》2012,86(1):85-95

Although its origin has not yet reached a consensus so far, MTS (Molar-Tooth Structure) has been documented for more than 100 years. Current study reports a discovery of MTS from the Mesoproterozoic Wumishan Formation, Lingyuan, Yanshan Region, North China, and the features and geological implications of MTS are further discussed. Here, straitigraphic horizons of MTS’s occurrences show that it was mainly located within the top part of the Wumishan Formation, i.e., limestone unit. Four kinds of morphology of MTS, i.e., fine fusiform, debris, ribbon, ptigmatic and nodular (irregular), were recognized and thought to be highly related to the sedimentary environments and facies. Geochemistry of MTS including oxides, trace elements and C, O and Sr isotopes indicates that the horizons of MTS-bearing is of higher Sr/Ba and Ca/Mg ratios, lower positive δ13C and highly negative δ18O values than the adjacent stratigraphic levels of rare MTS. Lithology, morphology and geochemistry of MTS in the Wumishan Formation suggest that MTS occurs mainly in shallow subtidal near the storm wave base, which is typically characterized by warm temperature, oversaturated calcium carbonate seawater and high organic productivity. Furthermore, occasional enrichment of algae bacteria here is more favorable for the calcification of calcium oozes and catalytic for MTS. C isotope composition of the Wumishan Formation and MTS of this study is well correlated with that of the Mesoproterozoic Belt Supergroup, North America and Riphean, Siberia, suggesting that MTS acts as a sedimentary record responding to global changes and is a perfect indicator in Precambrian stratigraphic correlation worldwide.  相似文献   

State of the climate in the Three Gorges Region of the Yangtze River basin in 2020          下载免费PDF全文

Tong Cui  Xianyan Chen  Xukai Zou  Qiang Zhang  Shuai Li  Hongling Zeng 《大气和海洋科学快报》2022,15(2):7-12

2020年,长江三峡地区年平均气温17.2℃,接近常年;年平均降水量1530.8毫米,偏多29％,为1961年以来第二多,仅次于1998年.6月,7月降水量及年平均暴雨日数均为1961年以来第二多.平均风速较常年偏大;相对湿度略偏高;各月均无酸雨出现,近十余年酸雨强度呈现明显减弱趋势.2020年,三峡地区夏季暴雨洪涝灾...  相似文献   

1951—2009年衢州气候变化特征     

吴利强  李娜 《辽宁气象》2011,(4):44-48

基于1951—2009年衢州国家基本气象站近59 a的气温、降水等资料,对衢州市特征性灾害天气——暴雨分布进行分析,探讨衢州市区域性气象要素的变化特征。结果表明：近59 a来衢州市年平均温度在波动中呈上升趋势,特别是20世纪90年代初期开始,气温急剧上升;90年代以后19 a的平均温度比50年代上升了0.68℃,其中冬季变暖比较明显,其次为夏季。极端气温年平均值也有上升趋势,且具有明显季节性,最高温度上升幅度大于最低温度上升幅度。衢州市年降水量变化有向极端方向变化的趋势,通常以4—5 a为一个周期,偏多和偏少年份交替出现,但平均年降水量的变化并不明显。年内降水量分布呈现明显的季节性,夏季较多,冬季较少。1966年前,年降雨量变化幅度较平稳,年降雨量偏少;1966年后,降雨量逐渐增多,1975年前后达到峰值,而后逐渐减少;1980年前后发生突变,且波动增多。  相似文献   

新疆金山金矿床中Cu-Zn合金矿物的发现及其地质意义     

杨隆勃  刘家军  朱亿广  朱炳玉 《矿物学报》2011,31(1):1-8

在研究新疆金山金矿床物质组分的过程中,通过对矿石矿物进行反光显微镜下观察与电子探针分析,发现了Cu-Zn合金矿物。与国内外已发现的Cu-Zn合金矿物相比,所发现的Cu-Zn合金矿物中Cu含量(81.35%～85.36%,平均83.75%)较高,Zn含量(6.08%～10.10%,平均为7.39%)较低,并含少量的Sn(4.13%～6.75%,平均为5.23%)、Ni(0.88%～1.38%,平均为1.05%),属于为α相Cu-Zn合金矿物。Cu-Zn合金矿物在自然界极为罕见,其生成条件也很独特。结合金山金矿成矿特征和形成条件,作者认为该Cu-Zn合金矿物是在热液成矿晚阶段(第Ⅳ阶段)强还原条件下的缺氧、缺硫环境中形成的。  相似文献   

新疆北山黑山岭一带多元信息综合分析与找矿靶区优选     

陈俊  郑勇  高俊宝  肖忠 《新疆地质》2011,29(4):437-441

以现代成矿理论为指导,通过GIS平台,经数据综合分析,提取新疆北山黑山岭一带地质、化探、物探、遥感和矿产等多元找矿信息,确定本区成矿要素,圈定出7个找矿靶区.采用成矿要素加权法对靶区进行优选和分类,并对优选找矿靶区进行野外验证,发现多处金、铜、钒矿点.表明在该区进行多元找矿信息综合分析与找矿靶区优选是有效的,可为新疆北...  相似文献   

长江三角洲地区生态足迹的时空动态及其可持续发展分析(英文)   总被引：3，自引：0，他引：3  

王萍  王新军 《地理学报(英文版)》2011,21(5):859-868

In the urbanizing world,the Yangtze Delta Region (YDR) as one of the most developed regions in China,has drawn a lot of the world’s attention for the remarkable economic development achieved in the past decades.Nevertheless,the rapid economic development was certain to be accompanied by unprecedented consumption and loss of natural resources.Therefore,the analysis of the ecological situation and driving factors of environmental impact was of great significance to serve the local sustainable development decision-making and build a harmonious society.In this paper,the ecological footprint (EF) was taken as the index of the ecological environmental impact.With the help of Geographic Information System (GIS),we studied the spatiotemporal change of ecological footprint at two scales (region and city) and assessed urban sustainable development ability in YDR.Then we discussed the driving factors that affected the change of ecological footprint by the Stochastic Impacts by Regression on Population,Affluence,and Technology (STIRPAT) model.The results showed that increasing trends of regional ecological footprint during 1998-2008 (1.70-2.53 ha/cap) were accompanied by decreasing ecological capacity (0.31-0.25 ha/cap) but expanding ecological deficit (1.39-2.28 ha/cap).The distribution pattern of ecological footprint and the degree of sustainable development varied distinctly from city to city in YDR.In 2008,the highest values of ecological footprint (3.85 ha/cap) and the lowest one of sustainable development index (SDI=1) in YDR were both presented in Shanghai.GDP per capita (A) was the most dominant driving force of EF and the classical EKC hypothesis did not exist between A and EF in 1998-2008.Consequently,increasing in ecological supply and reducing in human demand due to technological advances or other factors were one of the most effective ways to promote sustainable development in YDR.Moreover,importance should be attached to change our definition and measurement of prosperity and success.  相似文献   

新疆若羌县阿热力一带冰沟群沉积环境及层序地层分析     

栾元滇  宫述林  岳伟佳  孟令远 《山东地质》2011,(9):10-15

新疆若羌县阿热力一带位于东昆仑西段北坡、柴达木盆地西南缘。地层区划隶属于秦祁昆地层区、东昆仑-中秦岭地层分区,该区冰沟群分布广泛。对该区开展区域地质调查、对冰沟群的沉积环境和层序地层进行分析研究具有重要地质意义。在开展区域地质调查中,采用路线调查、剖面测量、实验测试等方法对冰沟群的岩性特征、岩石组合、地球化学特征、古生物特征以及形成时代等进行了系统研究,依据岩石组合特征将其划分为狼牙山组和丘吉东沟组。把该区冰沟群与区域上都兰县冰沟群层型剖面进行了对比,通过对比研究,认为该区的冰沟群与都兰县冰沟群层型剖面具明显可对比性。依据岩性特征、岩石组合特征、古生物特征等,对冰沟群沉积环境进行了分析,认为狼牙山组沉积环境属于潮下较深水陆棚相低能环境;丘吉东沟组属于浅海陆棚相带内缘斜坡沉积环境。并对冰沟群层序地层进行了划分,将其划分为2个Ⅲ级层序,即第一层序（B-1）和第二层序（B-2）。  相似文献   

新疆尼勒克县喀英迪地区铅锌矿地质特征及成因     

姚德刚  赵环金  贺业峰 《山东国土资源》2011,27(9)

喀英迪铅锌矿主要产于早石炭世阿克沙克组及其与晚奥陶世呼独克达坂组的接触带上。通过普查工作共圈定15个铅锌矿体。其中主要矿体4个,Ⅰ-4矿体处于晚奥陶世呼独克达坂组灰岩与早石炭世阿克沙克组的不整合接触面上及其两侧,工程控制总长度为523m,最大斜深100m。倾向70°～100°,倾角一般20°～50°,连续性较好。该矿体铅单工程厚0.86～5.64m,平均2.86m,厚度变化系数为70.57%;锌单工程厚0.80～5.64m,平均1.81m,厚度变化系数为93.97%,属于变化较稳定型矿体。铅单工程品位0.62%～16.47%,平均4.53%,品位变化系数114.34%;锌单工程品位0.53%～12.37%,平均3.78%,品位变化系数57.47%。属于有用组分分布较均匀型矿体。通过对矿床地质特征的研究,认为该矿床属沉积岩容矿的、层控的、构造控制非岩浆型低温热液矿床。  相似文献   

城市土地集约利用与区域城市化的时空耦合协调发展评价——以环渤海地区城市为例   总被引：24，自引：2，他引：22  

刘浩  张毅  郑文升 《地理研究》2011,30(10):1805-1817

处于城市化不同发展水平的城市,其土地集约利用的利用强度、利用形式与利用类型存在显著差异,城市土地利用最佳集约度与城市化水平密切相关,而城市土地集约利用与城市化的耦合协调可有效推动城市可持续发展。基于城市土地集约利用与城市化的交互耦合作用机制,本文构建两者之间的耦合协调发展度模型,定量评价城市土地集约利用与城市化的耦合协...  相似文献