Geochemistry of Clayey Aquitard Pore Water as Archive of Paleo-Environment,Western Bohai Bay

The record of paleo-environment in clayey aquitard pore water is much more effective relative to aquifer groundwater owing to the low permeability of clayey aquitard. Oxygen-18 (18O), deuterium (D), an...     

Innovation on Petroleum Engineering Technology of China Beach and Shallow Water Areas

1Chinaoffshoreoil&gasresourcesandtheircharacteristicfeatures　Chinaoffshoreoil&gasexplorationstartedduringthe1 95 0s .Until 1 971 ,thecommercialHai 4fieldwasfoundinBohai.Subsequentlytwoproductionplatformswereconstruc ted ,thefirstChinaoffshoreoilfieldwasformed .Fromthenon ,Chinaoffshoreoil&gasexplorationandexploitationspeedbecameprogressivelyfaster.Afteralargeamountofexplorationwork ,theoilandgasresourcesinChinacoastalareasweremadeclearpreliminarily .AccordingtoState sSecondaryResourceEva…     

贵县式三水铝土矿微量元素地球化学特征及其意义

本文应用微量元素地球化学理论,通过研究区内地层、红土剖面及矿物相中微量元素含量分配特点,结合野外观察结果,得出了本区三水铝土矿的成矿源岩是郁江组地层的结论,为本区找矿提供了新的线索。     

沉积盆地侵入岩区的异常“温度场、压力场和地球化学场”与油气的关系——以东营凹陷纯西辉长岩为例

通过岩石学、有机地球化学等分析 ,发现纯西辉长岩周围烃源岩具有有机质含量极低、高熟和裂缝发育以及油气比较丰富等特征 .研究表明 ,其根源是辉长岩形成的特殊温度场、压力场和地球化学场 ;辉长岩形成的异常高温大大促进了烃源岩热演化 ,并提高了生烃量 ;高压产生的大量裂缝为烃源岩排烃和油气聚集提供了通道和储集空间 ;而辉长岩带来的深源氢对烃源岩起到加氢作用 ,扩大了生烃量     

WDC-D地球化学数据分类与编码的初步研究

首先以地球化学实体为基本分类对象,运用线分类法进行数据分类.作者共把地球化学数据分为四个层次,从第一到第四层次的数据量分别为9、40、192和604.然后作者采用层次码编码方法对数据进行编码.码长共有9位,第1位用“J”表示地球化学数据分类在WDC-D中的顺序;第2位用“1~9”表示第一层次数据;第3、4位,第5、6位,第7、8位均用“00~99”分别表示第二、三、四层次数据,第9位用“1~3”表示数据的共享级别.     

Experimental and Parametric Design of Petroleum Back-pressured Hydraulic Impactor

Percussive-rotary drilling technology was considered many years ago as one of the best approaches for hard rock drilling. It is a key for popularizing this technology on a large scale to design and make an impactor with excellent performance. This paper presents a suit of method to design the percussive parameters for the oil or gas field by introducing the working principle of back-pressured impactor, dividing the working periods of impactor into three phases and establishing the computer emulational model of percussive parameters. It draws a comparison between the results of model calculation and experiment on the basis of analyzing the experiment results of impactor. The conclude provides credible foundation for designing and further ameliorating the impactor.     

华北克拉通恒山地区晚太古代变质火山岩的地球化学特征及构造意义

对恒山地区出露的变质火山岩开展岩相学、地球化学、锆石U-Pb年代学和Hf同位素研究,旨在确定其形成时代,探讨岩石成因及地球动力学意义。锆石U-Pb定年结果表明,这些变质火山岩喷发于新太古代晚期(2508±20Ma)。地球化学分析结果显示,恒山变质火山岩由变质玄武岩和变质玄武安山岩组成,SiO₂(45.51%～62.67%)、FeO_T (4.43%～15.72%)和MgO (3.75%～8.14%)含量变化幅度大,是幔源岩浆经单斜辉石、角闪石和磁铁矿分离结晶的产物。这些变质火山岩富集轻稀土(LREE)和大离子亲石元素(LILE),亏损重稀土(HREE)和高场强元素(HFSE),具有相对高的Th含量和Th/Yb比值,呈现钙碱性岛弧火山岩的特征。结合不相容元素比值Nb/Yb,Zr/Yb和(Nb/La)_N的特点,推测其来源于俯冲带具流体交代特征的富集地幔源区。结合区域构造背景,推断恒山变质火山岩形成于新太古晚期大陆弧环境。     

Origin of immature sulfur-rich oil in Jianghan oil field

Chemical structure of immature sulfur-rich kerogen and composition of immature sulfur-rich crude oil in Jianghun oil field have been studied. In molecular level, crude oil differs from thermolysed and chemolysed products of kerogen but does resemble the bitumen in immature sulfur-rich source rock. Therefore, immature sulfur-rich oil may be derived from the expelling of bitumen rather than from thermal cracking of kerogen.     

Determination of tectonic background for sedimentary basin from sandstone geochemistry

The chemical composition of sedimentary rocks is mainly controlled by source rocks. Through examining chemical composition of terrigenous rocks, the tectonic evolution of a sedimentary basin can be modeled. The Turpan Basin belongs to a continental sedimentary basin and its source rocks are derived from the upper continental crust.     

The neodymium isotopic characteristic and geological significance of Kuokesu plagioclase amphibolites from the Kuruktag, Xinjiang, China

The plagioclase amphibolites from Kuokesu area, Kuruktag, Xinjiang occur as enclaves embedded in the granodioritic gneiss. In the light of major elements and REE data, the parent rocks of the plagioclase amphibolites belong to weak_alkaline basalts. Their Nd model ages mainly range from 2 832 to 3 075 Ma. The seven plagioclase amphibolites yield a reasonable good isochron age of (828±86) Ma(2σ) with I Nd =0.510 981±82, ε Nd ( t )=-11.5±1.6. Such a case shows the existence of great proportion of the Archaean mafic crustal basement on the Kuokesu area. The strong tectonic_thermal event at about 820 Ma made the Sm_Nd isotope of the metamorphic rocks homogenization. This event would be associated with the Tarim Movement.