沁水盆地晚古生代含煤沉积体系及其控气作用   总被引：3，自引：0，他引：3  

贾建称 《地球科学与环境学报》2007,29(4):374-382

沁水盆地晚古生代含煤地层主要为晚石炭世太原组和早二叠世山西组,可采煤层有太原组第15号煤层和山西组第3号煤层,两者均为高煤阶无烟煤。对含煤地层内部各成因相及其组合的综合分析表明,太原组为陆表海多堡岛与碳酸盐台地复合沉积体系。第15号煤层形成于海退持续时间较长的潮汐三角洲环境,其中三角洲平原沼泽相中煤层较厚,滞留泻湖相中煤层较薄,障壁沙坝一带煤层厚度较稳定。山西组为河控三角洲沉积体系。三角洲平原沼泽环境中均衡补偿沉积持续时间较长,形成的第3号煤层厚度较大,结构简单。三角洲前缘沙坝中煤层厚度稍薄,分流河道中煤层不稳定。煤层气勘探实践表明,在同一口试气井中,盆地内大部分地方第3号煤层比第15号煤层厚度大,生气能力强,煤层气保存条件优越,气体质量浓度、含气饱和度、煤层气资源量高。因此,第3号煤层应是沁水盆地煤层气试采和商业化开发的首选目标层。  相似文献   

黄河落淤治理巨野煤田塌陷区可行性初探   总被引：2，自引：0，他引：2       下载免费PDF全文

黄文峰  朱昶  张洪波  成广宇  张楠 《山东国土资源》2006,22(6):126-129

巨野煤田自南向北呈条带状分布。北依黄河，南接万福河。洙水河、洙赵新河、郓鄄河、郓巨河等黄河支流倾斜穿过矿区，这为大面积利用黄河落淤治理沉陷地区提供了天然的运输河道和动力，通过合理疏通和开挖河道引流落淤并配合使用远距离输沙技术，将使巨野煤田恢复沃野千里成为可能。  相似文献   

Late Cretaceous-Paleogene Palynostratigraphy from the Arkhara-Boguchan Brown Coal Mine of Zeya-Bureya Depression, Russia     

Tatyana V.Kezina 《世界地质(英文版)》2003,6(2)

A well-preserved Late Cretaceous-Paleogene palynological flora from the middle member of the Tsagajan Formation and the upper member of the Tsagajan Formation including the Kivda Beds is reported for the first time from the Arkhara-Boguchan brown coal mine, southeastern part of the Zeya-Bureya Basin. Four palynocomplexes were established for the Cretaceous-Tertiary transition. The climate and phytocoenoses were also analyzed,based on the detailed palynological data. The results are coincident with those of mega-flora studied by Akhmetiev et al. (2002).  相似文献   

朝阳石炭系煤层中的漂砾     

童玉明  张荣江 《国土资源》1989,(1)

作者在辽宁省朝阳煤矿北腰矿井石炭系煤层内获石英岩漂砾。漂砾层厚约几 cm,漂砾多呈圆形或椭圆形,倾斜产出,长约2.5—4cm,宽约2.2—3.5cm,厚约1.2—1.5cm。砾石呈深灰色,表面光滑,有一层薄膜,无棱角,具裂缝。煤的变质程度低,灰分高。推测系华北地台型聚煤盆地北缘古陆震旦系石英岩被风化剥蚀,随水流长距离搬运,并泛入泥炭沼泽而形成的。  相似文献   

于家沟地下水反应溶质运移规律数值仿真     

梁冰  王岩 《地球科学与环境学报》2006,28(4):58-63

针对矸石淋滤液对于家沟地区地下水污染的实际情况,分析其在含水层中运移的规律,充分考虑了地下水变密度对浓度分布的影响,建立了多组分溶质在地下水中运移的耦合动力学数学模型,采用Galerkin有限元方法和Picard迭代法相结合对耦合模型进行了离散,通过室内土柱实验求得基本参数并对地下水污染的动态过程进行了仿真模拟,预测了污染浓度的时空分布特征。结果表明:污染面积随时间推移不断向两轴方向扩大,且纵向显著;不同组分由于各自特征的巨大差异,受到地下水密度影响的程度也有很大差别;渗滤液浓度拟合误差小于6%,从而验证了模型的可靠性和实用性。  相似文献   

煤层气藏的储集特征及储层评价   总被引：1，自引：0，他引：1  

杨建业  杜美利  苏小鹏  李慧利 《地球科学与环境学报》1995,(3)

论述了煤层气非常规天然气的特征，指出控制煤储集性能的因素主要是煤岩性质、煤层埋藏深度及地质构造条件等，并综合分析了煤层气储层各种评价参数，指出各种有利于煤层气藏的地质条件和物性条件。  相似文献   

煤矿开采对明水泉的影响浅析          下载免费PDF全文

袁传芳  张运区  逯志强 《山东国土资源》2003,19(6):48-51

明水泉群为我国北方罕见的岩溶大泉，具有典型的雨源型特征。大气降水和雨洪水下渗后，向明水一带汇集，受西部文祖断层阻挡而富集，受上覆煤系地层阻隔而承压，在特定的构造条件下，沿断层破碎带或人工钻孔涌出地表，便形成明水泉群。煤系地层是明水泉群形成和存在的基本地质条件之一。煤矿开采吸引大量岩溶泉水，而且破坏原生的地质结构，影响明水泉群的正常出流，危及明水泉群的存在。针对煤矿开采对明水泉群的影响，建议实施相应保泉措施。  相似文献   

青海煤层气资源概况及找气方向     

王嵩  张廷江 《青海国土经略》1997,(2)

本文在总结青海省煤田地质系统、省属各煤矿、地方煤矿及石油地质系统资料的基础上,估算了各煤田或矿区(井田)的煤层气资源量,并指出了青海现阶段资源条件、开发条件及找气前景较好的区域。  相似文献   

浅析中国中西部盆地煤系烃源岩成烃研究     

曾治平  邹华耀 《南方国土资源》2002,15(2):43-46

烃源岩作为石油、天然气的母源 ,在油气地质研究和油气勘探中占有相当重的位置。伴随着传统生油理论“源控论”的发展 ,煤系烃源岩的发展也得到广泛的关注 ,其研究内容也不断拓展。根据煤系烃源岩的有机质丰度及相关指标 ,指出煤系烃源岩可以成烃 ,只是作为未成熟—低成熟的向油气转化阶段 ,同时也能够在一定条件下成为具有工业性价值的煤系地层油气藏。中国西北部地区广泛存在煤系地层 ,同时也发现煤系有机质转化为烃类 ,对比西北部 ,中国中西部的含煤地层 ,存在构造的复杂因素 ,在转化过程中考虑的因素很多 ,因此在研究煤系地层的成烃作用时 ,必须慎重 ,结合综合指标才能判断  相似文献   

Permeability evolution in fractured coal: The roles of fracture geometry and water-content   总被引：4，自引：0，他引：4  

Shugang Wang  Derek ElsworthJishan Liu 《International Journal of Coal Geology》2011,87(1):13-25

We report laboratory experiments that investigate the permeability evolution of an anthracite coal as a function of applied stress and pore pressure at room temperature as an analog to other coal types. Experiments are conducted on 2.5 cm diameter, 2.5-5 cm long cylindrical samples at confining stresses of 6 to 12 MPa. Permeability and sorption characteristics are measured by pulse transient methods, together with axial and volumetric strains for both inert (helium (He)) and strongly adsorbing (methane (CH₄) and carbon dioxide (CO₂)) gases. To explore the interaction of swelling and fracture geometry we measure the evolution of mechanical and transport characteristics for three separate geometries — sample A containing multiple small embedded fractures, sample B containing a single longitudinal through-going fracture and sample C containing a single radial through-going fracture. Experiments are conducted at constant total stress and with varied pore pressure — increases in pore pressure represent concomitant (but not necessarily equivalent) decreases in effective stress. For the samples with embedded fractures (A and C) the permeability first decreases with an increase in pressure (due to swelling and fracture constraint) and then increases near-linearly (due to the over-riding influence of effective stresses). Conversely, this turnaround in permeability from decreasing to increasing with increasing pore pressure is absent in the discretely fractured sample (B) — the influence of the constraint of the connecting fracture bridges in limiting fracture deformation is importantly absent as supported by theoretical considerations. Under water saturated conditions, the initial permeabilities to all gases are nearly two orders of magnitude lower than for dry coal and permeabilities increase with increasing pore pressure for all samples and at all gas pressures. We also find that the sorption capacities and swelling strains are significantly reduced for water saturated samples — maybe identifying the lack of swelling as the primary reason for the lack of permeability decrease. Finally, we report the weakening effects of gas sorption on the strength of coal samples by loading the cores to failure. Results surprisingly show that the strength of the intact coal (sample A) is smaller than that of the axially fractured coal (sample B) due to the extended duration of exposure to CH₄ and CO₂. Average post-failure particle size for the weakest intact sample (A) is found to be three times larger than that of the sample B, based on the sieve analyses from the samples after failure. We observe that fracture network geometry and saturation state exert important influences on the permeability evolution and strength of coal under in situ conditions.  相似文献