渤海湾盆地第三系火山岩及其成因

对渤海湾盆地第三系火山岩及其成因进行的研究表明,渤海湾盆地火山夺主要为玄武岩,其次是辉绿岩,局部分布有少量安山岩、玄武安山岩、粗面岩、火山碎屑岩;辽河坳陷基本为高钾玄武岩;黄骅坳陷火山夺与济阳坳陷相似,既有高钾玄武岩,也有中钾玄武岩。全盆地范围内玄武岩基本上为碱性玄武岩,少量为亚碱性玄武岩。所有喷出相的火山岩（包括玄武岩和火山碎屑岩）中铕（Eu)异常均不明显,δEu近于1,因此岩石形成过程中未曾发生铕的亏损或富集事件。这说明原始玄武岩浆生成后,在个上升和结晶过程中未受到地壳物质的强烈混染,各期玄武岩均是幔源原生岩浆固结的产物。而侵入相的辉绿岩中铕的含量则有明显的正异常,这可能与岩浆能量较弱、上升速度较慢及发生分离结晶作用有关。盆地内玄武岩是具有突出特征的板内玄武岩。     

软岩遇水膨胀引起的巷道底臌

本文通过力学分析,建立了适用于煤矿开采巷道中求解膨胀引起的巷道底臌的数学表达式。基于该式,对现场实际巷道进行了分析,并探讨了膨胀对巷道底臌的影响程度及其影响因素。     

YJL—90型岩体弱面直剪流变仪的研究

本文介绍了一种岩体弱面直剪仪的研制及其主要参数。     

Discussion on marine source rocks thermal evolvement patterns in the Tarim Basin and Sichuan Basin, west China

Taking marine source rocks of lower Paleozoic in the Tarim Basin and Paleozoic ones in the Sichuan Basin as examples, their sedimentation process could be classified into four styles continuous subsldence with deep sedimentation in early stage, continuous subsidence with deep sedimentation in later stage, that deeply buried-uplift-shallowly buried, and that shallowly buried-uplift-deeply buried.Unlike that in East China, the marine source rocks evolvement patterns did not accord with sedimentation styles one by one in superimposed basins in west China. Taking local geothermal field into account, four types of source rock evolvement patterns were built that evolved fast in early stage,evolved fast in middle stage, evolved continuously and evolved in multistage. Among them, the 1st pattern contributed little to the present industrial oil pools directly, but paleo-oil reservoirs and gases cracked from crude oils were main exploration targets. Although some gases were found in the 2nd pattern, the scale was not big enough. For the 3rd and 4th patterns, the hydrocarbon potential depended on organic matters maturity in early stage. For relatively low mature rocks, it was possible to generate some oils in later stage; otherwise the main products were gases. Paleo-oil reservoirs remained fairly well in the Sichuan Basin, and most source rocks underwent kerogen-oil-gas processes,which was useful reference to gas exploration in the Tarim Basin.     

岩石裂纹扩展机理分析模型与应用

以单一裂纹岩石为研究对象,采用东北大学岩石破裂与失稳研究中心的岩石破裂过程分析系统(RFPA),分析裂纹破坏机理.依据铜川矿区东坡井田的实际地质资料,建立Z2M1、Z2M2两种不同均质度的构造界面模型.数值实验结果表明,岩石的破坏是由原生裂纹引起的,构造界面的不同是引起采煤沉陷及覆岩破坏规律差异性的重要因素.对岩体变形机理的研究为控制地表破坏提供理论依据.     

Characteristics of hydrocarbon source rocks of No.3 buried-hill region in Nanpu Sag

Based on the data of 44 samples of hydrocarbon source rocks in Nanpu No.3 buffed-hill region, the kerogen type is judged through the pyrolysis and microscopic identification. At the same time, organic matter maturity and hydrocarbon generation threshold are studied by using vitrinite reflectance, pyrolysis yield and hydrocarbon abundance. Meanwhile the hydrocarbon expulsion threshold is calculated. And the characteristics of organic hydrocarbon generation and expulsion are preliminarily revealed and evaluated. The result shows that the No.3 buffed-hill region has abundant hydrocarbon source rocks with high content of organic carbon. And the primary types of kerogen are II, and lI 2. The hydrocarbon source rocks which passed biochemistry, thermolysis and thermal cracking have developed into the mature-postmature phase of different extents. And plenty of oil and gas were expelled out. It is believed the depth of oil-generating window is 3 600 m and the depth of hydro- carbon-expulsion threshold is 4 100 m. The comprehensive analysis indicates that Nanpu No.3 burried-hill region has a certain condition to generate hydrocarbon which is very promising in oil exploration and thus can become an important exploration and development target next.     

六盘山盆地白垩系烃源岩发育特征与勘探方向

在野外实测地层剖面、钻井资料和二维地震资料解释的基础上,结合野外露头和钻井取心岩样的地球化学资料,总结分析了六盘山盆地白垩系的烃源岩发育特征,研究认为:K1l组暗色泥岩发育程度低,单层厚度薄,有机质丰度低但已达成熟阶段;K1n,K1m沉积厚度较K1l薄,暗色泥岩发育程度高,单层厚度厚,有机质丰度高,处于低成熟阶段。利用生物标志化合物对C1,C2井原油、露头沥青与白垩系烃源岩进行了油源对比分析,认为K1m与K1l烃源岩都发生过油气生成和运移,而K1l烃源岩为目前最现实的烃源岩;结合探井钻探效果分析,认为六盘山盆地油气勘探应以寻找靠近生烃中心的断裂发育区和构造圈闭为主。     

埋藏有机酸性流体对白云岩储层溶蚀作用的模拟实验

通过0.2%乙酸与亮晶鲕粒含灰云岩、鲕粒云岩和粉细晶云岩的埋藏溶蚀模拟实验,对埋藏环境下有机酸流体流经白云岩内部对其溶蚀改造作用及其产生的溶蚀效应进行研究。结果表明:3种类型白云岩释放出Ca2+、Mg2+物质的量浓度为(13.19~20.48)×10-3mol/L,随着埋藏深度的增加(温度和压力升高),有机酸对白云岩的溶蚀能力相应降低,但降低的幅度不超过20%;溶蚀后样品的质量平均损失约1%,而孔隙度平均提高5%,渗透率平均增加幅度高达300%;有机酸性流体在深埋条件下仍对白云岩地层具有较强溶蚀性;白云岩经埋藏溶蚀后其内部孔隙和喉道溶蚀加大,并相互连通,导致孔喉体积增加、数量降低,这对渗透率的提高具有异常明显的效果,从而有利于油、气的储集与运移。     

吐哈盆地水西沟群“近生近储”型致密砂岩气藏特征及其成藏机制

通过对多种地化指标的分析、对气藏与煤层关系的统计对比以及储层物性的测定,在野外露头观测、精细岩心观察和区域沉积剖面对比的基础上,总结吐哈盆地水西沟群的沉积模式,并结合气藏剖面实例对水西沟群致密砂岩气藏进行研究。结果表明:研究区致密气与其煤系源岩密切相关;成藏的有利因素主要来自于砂岩与煤层的大面积直接接触,以及决口扇体及构造裂缝这种"烟囱"状通道对源储的有效连通,其在本质上是一种源、储皆在水西沟群内的煤系源岩和致密砂岩储层间产生、运移和聚集的"近生近储"型气藏。     

贵阳乌当教学实习基地红花园组硅质岩成因的初步研究

乌当大、小麻窝断裂中的红花园组硅质岩呈团块状、透镜状、不规则状产出.野外观察和显微镜下鉴定表明这些硅质岩可能为交代作用形成.常量元素分析表明硅质岩以SiO2为主,其他含量较低.通过岩石显微镜下研究、化学全分析、微量元素分析、稀土元素分析,初步推测:该区硅质岩的形成是含大量硅质的热液活动作用于红花园组的生物碎屑灰岩,发生...