Early Palaeozoic carbonate reservoirs from the Yingshan Formation of Well block ZG‐43 in Tazhong Low Rise,Central Uplift,Tarim Basin,NW China: geological features and controlling factors     

Xiao‐dong Lan  Xiu‐xiang Lü  Hong‐feng Yu  Yan‐ming Zhu  Bo Yan 《Geological Journal》2014,49(3):256-270

Marine carbonate reservoirs, as a focus of petroleum exploration and development in China, are involved with high exploration risk and prediction difficulty owing to high heterogeneity and diversity of reservoir beds. In the Tarim Basin, NW China, carbonate reservoirs host about 38% of the whole basin's hydrocarbon resources in a large prospecting area mainly distributed in the Cambrian and Ordovician rocks in central (Tazhong) and northern (Tabei) Tarim. Recently, a better understanding has been made of the karsted weathering crust at the top of the Lower Ordovician Yingshan Formation in the northern slope area of the Tazhong Low Rise, Central Uplift, Tarim Basin. As a new frontier of exploration, oil/gas distribution and controlling factors of carbonate reservoirs in the Yingshan Formation are not clearly understood. In this work, we investigated the reservoir beds and oil/gas properties in 13 wells in Well block ZG‐43 on the No. 10 structural belt in the Tazhong Low Rise, and studied hydrocarbon accumulation characteristics with seismic and geochemical data. The Yingshan Formation in Well block ZG‐43 is mainly composed of calcarenite, dolomitic limestone, dolomite, cryptite, as low porosity and low permeability reservoir beds, with fracture‐void porosity constituting the main reservoir pore space. Oil/gas is quasi‐layer distributed beneath the unconformity between the Yingshan and Lianglitag formations to a depth of 140 m. The oil in Well block ZG‐43 is condensate with low density, low viscosity, low sulphur, low resin, low asphaltene, and high wax. The gas is 87.3% methane, generally containing H₂S. The oil/gas distribution pattern is oil in the east and gas in the west, and H₂S content in the west is lower than that in the east. The controlling factors for hydrocarbon are multi‐source supply and multi‐phase charging, interstratal karstification, hydrothermal activity, structural location and sealing condition. A structural–lithological trap is the main type of oil/gas accumulation. Oil/gas distribution was clearly affected by strike–slip faults. Oil/gas with multi‐source supply and multi‐phase charging was controlled by favourable local palaeo‐highs, and affected by later karsting and hydrothermal activity, as well as gas invasion in the Himalayan (Cenozoic) period. Under the caprock of compact limestone in the third to fifth members of the Lianglitag Formation, oil/gas migrated up along the strike–slip fault planes, and moved laterally to both sides in a ‘T’ shape, and formed large‐scale quasi‐layer condensate gas reservoirs controlled by reservoir bed quality. Copyright © 2013 John Wiley & Sons, Ltd.  相似文献   

土壤蚀变碳酸盐的区域性分布特征及其地球化学意义   总被引：1，自引：0，他引：1  

赵静  熊永强  梁前勇  李芸 《地球化学》2014,(6)

土壤蚀变碳酸盐(?C)是油气化探的一个重要指标,在油气化探中得到广泛的使用,并取得了较好的效果。然而由于对?C 的碳源及其具体矿物形态相知较少,导致该法在业内存在一定的质疑。本文通过对不同地区地表土壤样品、海底沉积物以及钻井岩屑样品进行对比分析,研究其碳源、分布特征及矿物形态。结果表明,不同化探样品中?C的含量与所处的地质环境有关,陆地地表土壤样品中?C的含量普遍较高,其次为海底沉积物样品,钻井岩屑样品中的最低;而钻井岩屑样品(还原环境)中?C 的δ13C 值比地表土壤样品及海底沉积物样品(近地表氧化环境)都要偏轻;由此推测形成?C的碳源有无机、有机以及混合源三种,各种来源的 C 对?C 的贡献因化探样品所处的地质环境的不同而不同; X 射线衍射物相分析结果表明,形成ΔC 的CO2除了由方解石和白云石的分解产生外,还有少量的由未知矿物提供。  相似文献   

硅酸钙晶种法回收污水中磷的实验研究     

孙华  郑红  马鸿文  李雍 《岩石矿物学杂志》2014,33(6):1151-1156

实验研究了以钾长石水热分解的副产物沉淀硅酸钙为晶种,回收模拟污水中磷的效果。结果表明,晶种用量0.4 g/L、p H值为8、Ca/P(摩尔比)=2条件下反应2 h后,污水中剩余磷浓度为0.32 mg/L,低于我国污水综合排放一级A标准0.5 mg/L。沉淀硅酸钙重复使用60次后回收磷的效果仍然较好,回收率为79.5%以上。采用扫描电镜、红外光谱、粉晶X射线衍射等测试手段对回收产物进行的分析表明,回收磷产物以羟磷灰石形态存在,产物中P2O5含量在35%以上,达到了富磷矿的品位。沉淀硅酸钙有望成为回收磷的理想晶种材料。  相似文献   

Preparation of K_2CO_3 Using Potassic Syenite from East Qinling Mountains     

YANG Jing  MA Hongwen  QI Hongbin  LUO Zheng  ZENG Cheng 《《地质学报》英文版》2014,88(Z1):388-388

正1 Introduction Songxian at East Qinling mountains in China possesses more than 100 million tons potassic syenite with the average K2O content of 13%and the main mineral phase of K-feldspar which is a kind of potential potassium  相似文献   

Lithium Extraction from Carbonate-type Saline Lake by Utilizing of Geothermal Solar Pond in Tibet     

YU Jiangjiang  ZHENG Mianping  WU Qian  NIE Zhen  BU Lingzhong 《《地质学报》英文版》2014,88(Z1):389-390

正1 Introduction The geothermal solar pond is a kind of special solar pond.It is different from traditional solar pond,which high temperature geothermal water can be used to heat brine.When the salt in the brine reaches saturation temperature,it precipitate out and is separated from the brine.Compared with solar pond,the geothermal solar pond does not rely entirely on solar radiation as a heat  相似文献   

Separation Technologies of Potassium from Salt Lakes     

SHA Zuoliang  LI Jibin  WANG Yanfei  YUAN Jianjun 《《地质学报》英文版》2014,88(Z1):367-368

正1 Introduction Salt Lake,as a kind of chemical resources,has been attracted to many researchers,especially the resources of lithium.As reported,many kinds of brines exist in the world depending on the compositions of the brine.Based on the chemical composition the brines can be classified as the types of chloride,carbonate,sulfate.For different  相似文献   

广东禾尚田钨锡矿床地质特征及成矿模式     

周明文 《华南地质与矿产》2014,(2):146-154

禾尚田钨锡矿床产于上泥盆统天子岭组碳酸盐岩中,矿床类型为石英细脉带型,脉体具有倾向上延伸长、厚度变化不大等特征。根据区域重、磁及化探资料推测,在九峰岩体与大东山岩体之间的瑶山复背斜,两岩体深部几乎可以相连,矿区深部可能有隐伏岩体,且矿区所做的重力剖面测量工作发现矿区处于隐伏岩体的上凸部位;另外,钨锡矿床的成矿时代与其南北两侧的大东山岩体、九峰岩体时代基本一致,且该时期又为粤北乃至整个南岭地区成岩成矿高峰期;说明禾尚田矿区钨锡矿的成矿与深部的隐伏岩体关系密切,基于此,建立了禾尚田钨锡矿床的成矿模式,为后续的勘查工作提供新思路。  相似文献   

碳酸盐岩地层中B元素测试方法——一种改进的ICP-AES方法简     

刘玖芬  赵正鹏  刘淑亮  刘晓煌  温良  黄北川 《地质通报》2014,33(1):120-126

为解决碳酸盐岩地层中B元素分析困难的问题,采用HF-HNO3-HClO4-H3PO4溶样,电感耦合等离子体发射光谱法测定碳酸盐地层中的B元素。该方法的特点是,在溶样体系中加入适量H3PO4避免B元素的挥发损失,并对H3PO4最佳用量进行了试验。方法检出限3.8×10-6（10SD）,用国家一级标准物质进行准确度、精密度验证,精密度（RSD）小于6.44%,准确度（ΔlgC）小于0.087。该方法还可以同时测定Be、Ba、Cr、Cu、Co、Ni、Pb、Mo、V、Mn、Li、Zn、Ga 等十几种元素,也适用于土壤、岩石、水系沉积物其它样品中B等多元素同时测定。运用该方法测试了西南天山哈拉奇地区碳酸盐地层中B、Co、Ni、Cu、Zn、Pb、Ba等元素,并对其地质意义进行了简要探讨。  相似文献   

大电流密度下阴极产物膜的探讨   总被引：4，自引：0，他引：4  

朱锡昶  葛仁淦  朱颖 《海洋工程》1997,(1)

在室内和现场不同大电流密度下形成阴极产物膜，通过观察膜的形貌、厚度、强度、分析成份，对其进行电位衰变试验、阴极极化试验、生锈试验及维持保护电流试验，进行分析比较，同时对涂层和阴极保护联合防腐时涂层破损、剥落处阴极产物膜的形成，及其对电流密度、保护电位的影响作了探讨。本文还对阴极产物膜的应用价值，以及在阴极保护中应用的可能性作了阐述。  相似文献   

鄂西峡口地区中二叠统栖霞组碳酸盐岩微相及相序     

李飞  张宁  夏文臣 《地质科技情报》2010,29(1)

鄂西峡口地区在构造上属中扬子台地北缘,发育了一套比较完整的中、上二叠统海相碳酸盐岩沉积。采用微相分析的方法,对中二叠统栖霞组碳酸盐岩的生物组合、微相类型和沉积环境进行了研究,将峡口地区的栖霞组沉积归纳为7种微相:多类型生物碎屑粒泥灰岩、含大壳体有孔虫的生物碎屑粒泥-泥粒灰岩、粗枝藻粒泥-泥粒灰岩、破碎的生物碎屑粒泥灰岩、具定向排列的藻屑—腕足泥粒灰岩、含内碎屑的生物碎屑泥粒灰岩、含原地珊瑚和藻类的生物碎屑泥粒灰岩。碳酸盐岩微相类型的垂向序列指示了峡口地区的栖霞组形成于碳酸盐岩缓坡环境,其底部地层沉积于内缓坡局限海相,中上部地层为内缓坡边缘低能生物丘相与内缓坡开阔海相的交替沉积。  相似文献