成岩

This paper reviews the forming reasons of extremely low permeability of tight sandstone gas reservoir,including congenital aggradation and acquired diagenesis.

论述了致密砂岩气藏特低渗形成的原因：即先天的沉积因素和后天的成岩作用等。

The paragenetic sequence are in the order of calcite-kaolinite, secondary quartz overgrowths-illite-dawsonite and ankerite.

成岩共生序列依次为方解石-自生高岭石、次生加大石英-伊利石-片钠铝石、铁白云石。

For excluding poorly preserved shells, a shell alteration index is suggested to estimate the state of preservation of brachiopod shells through examination under cathodoluminescence and scanning electron microscopes. This study shows brachiopod taxa e.

基于壳体保存程度的详细分析，以阴极发光程度、壳体显微结构为参数建立了壳体成岩作用改造程度的量化模式，经化石壳体氧、碳同位素值的验证，这一模式基本可以用来对不同保存环境下的样品进行筛选。

Objective To observe the effect of calcium hydroxide glycerin paste on dissolution of smear layer inside the root canals.

认为这一地区重要的成岩作用类型有压实作用、胶结作用及溶解作用。11。目的观察氢氧化钙甘油糊剂对根管壁玷污层的溶解作用。

The main diagenesis includes compaction, cementation, corrosion and dissolution, etc.

典型的成岩作用类型包括压实作用，胶结作用和溶蚀、溶解作用等。

Volumetric contraction in the process of compaction, in our opinion, is the main reason for this phenomenon.

笔者认为在成岩过程中沉积物可能发生的体积收缩应该是导致这种伸展率异常的主要原因。

Deep formation reservoir ; organic-inorganic interactions ; fluid chemistry ; circulated convection current ; diagenesis

深部储层；有机-无机化学反应；水介质性质；循环热对流；成岩作用

Based on the compared and simulated experiment, it was quantitively studied on the effect of macrobenthos (Ilyoplax deschampsin and Corbicula fluminea) on the exchange of nutrient across the sediment-water interface and the early diagenesis of nutrient in the tidal flat sediments from the Yangtze Estuary. Ilyoplax deschampsin and Corbicula fluminea affected the exchange of nutrient across the sediment-water interface by the different biological mechanisms.

本文依据长江河口滨岸潮滩大型底栖动物的自然分布特征，选取了两段典型的研究区域－崇明东部潮滩和浒浦岸段边滩，运用实验模拟和对比分析方法，定量地研究了大型底栖动物谭氏泥蟹和河蚬对潮滩生态系统中营养盐的界面扩散及其早期成岩变化的影响。

On the other hand, Cu, Co and Ni are all present in manganese phase in the hydrogenic nodules.

这些过渡金属元素在成岩作用形成的结核中的存在与铁锰结核中锰矿物和铁的氧化物、氢氧化物的晶体化学特征密切相关，而在水成作用形成的铁锰结核中的富集与锰矿物和铁的氧化物、氢氧化物的晶体化学特征关系不大。

Nationwide sampling program is designed according to the resources distribution and coal-forming periods as well as coal rank and yield of coal in China, 305 coal samples were collected and determined by catalytic spectrophotometry combined with pyrohydrolysis.The geochemical mechanism of the concentration or depletion of iodine was discussed during the process of coalification,which including peat diagenesis and coal metamorphism.The contents of iodine in Chinese coals fall in the range of 0.04-39.51 mg/kg.

根据中国煤炭资源分布和成煤时代，兼顾煤的变质程度和煤炭产量分布，在全国范围内采集了305个煤样，采用高温热水解—催化分光光度法分析了煤中碘的含量，探讨了煤化作用(包括泥炭成岩作用和煤变质作用)过程中煤中碘富集或亏损的地球化学机制。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。