我国页岩气资源及影响因素     

史长营  王峰  秦娜  王辉 《山东地质》2014,(4):58-61

在世界面临能源短缺的背景下,页岩气作为油气勘探的一个新领域,越来越得到世界各国的重视。我国页岩气资源丰富,许多盆地或地区具有页岩气大规模成藏的地质条件,对页岩气的研究显得尤为重要。该文介绍了我国页岩气资源储量、分布及开采面临的问题,概述了页岩气地质特征。在此基础上探讨了我国页岩气的影响因素,认为我国页岩气主要受有机碳含量、成熟度、裂缝的发育程度、地层压力的控制;页岩气与煤层气同属于非常规天然气,其赋存形态、成因类型、富集规律具有很多相似之处,因此可将页岩气与煤层气进行对比研究。  相似文献   

陕西黄陇煤田侏罗系煤层气开发关键技术     

祁满意 《中国煤炭地质》2014,(2):21-24

黄陵煤田侏罗纪煤层裂隙发育,渗透率高,煤层气开发的地质条件优越,即将成为我国煤层气开发一个重要的潜在接替领域,根据焦坪矿区和彬长矿区煤层气开发取得的成果,详细探讨了煤层气开发方式、井位部署、钻完井工艺、压裂工艺和排采工艺等关键技术,指出欠平衡钻进、基于储层保护的洞穴完井和分层控压联合排采将是该区煤层气开发技术发展的方向。  相似文献   

沁水盆地南部王坡井田煤层气开发潜力分析     

吴静 《中国煤炭地质》2014,(4):25-28

根据王坡井田地质条件及3号煤层储层特征,结合区内地形和交通等条件,分析了适合于王坡井田的煤层气开发方式,并采用数值模拟方法预测了不同方式的煤层气井产量及储层压力和含气量的变化,评价了本区煤层气的开发潜力。结果表明:王坡井田3号煤厚度大,含气量高,渗透性好,具有良好的资源开发前景;丛式井和水平井开发不仅能提高产量,还能有效降低井下瓦斯含量,两种方式相结合将带来巨大的经济效益和广阔的商业前景。  相似文献   

彬长矿区煤层气储层参数及开发潜力     

辛欣  张培河  姜在炳  张东亮  田振林 《中国煤炭地质》2014,(3):19-22

彬长矿区煤的变质程度低,矿井瓦斯涌出量大,瓦斯治理形势日趋严峻。根据矿区地质勘查、井下及煤层气井所获得的地质资料显示,煤层气开发的主要目标4煤层厚度大,分布稳定,煤体结构好,渗透率和气含量相对较高,气含量最高可达6.29m3/t,估算煤层气资源量为132.743×108m3。依据煤层气资源丰度划分,矿区煤层气富集区总面积为87.41km2,资源量为40.06×108m3,主要分布在大佛寺井田,相对富集区主要位于胡家河井田中南部和孟村井田东部,贫气区主要位于孟村井田西部、文家坡井田。综合分析认为研究区煤层气开发地质条件相对较好,属于可以抽采煤层,大佛寺井田为地面煤层气勘探开发最具潜力的地区。  相似文献   

降雨入渗补给地下水数值模拟研究     

何渊 《中国煤炭地质》2014,(7):36-41

针对在地下水资源评价中入渗补给量采用经验估算存在较大误差的问题,以神东矿区为例,在广泛调查矿区包气带岩性结构并结合野外取样、室内参数测定的基础上,采用数值模拟的方法建立包气带水分运移数值模拟模型,定量模拟矿区内不同地段降雨入渗强度,探讨影响降雨入渗强度的主要因素,计算得出研究区降雨入渗系数大致在0.18~0.27,分析认为影响降雨入渗强度的因素有降雨量、潜水埋深、包气带岩性等。其中在研究区广泛分布的风积沙对地下水资源起到了一定的保护作用。  相似文献   

黑龙江七星河含煤盆地古近纪-新近纪沉积相及层序地层特征   总被引：1，自引：0，他引：1  

商晓旭  ;邵龙义  ;马立军  ;野兆瑞  ;曲延林 《中国煤炭地质》2014,(9):1-7

黑龙江省东部七星河盆地是一新生代聚煤盆地,其含煤地层为古近系宝泉岭组、新近系富锦组。宝泉岭组由各级砂岩、泥岩、炭质泥岩以及褐煤组成,发育滨浅湖相、深-半深湖相、三角洲平原相,属于湖泊沉积体系、三角洲沉积体系。富锦组主要由泥岩、粉砂岩、中砂岩、含砾粗砂岩及煤层、炭质泥岩、硅藻岩组成,发育滨浅湖相、扇三角洲平原相,分别属于湖泊沉积体系和扇三角洲沉积体系。层序SI相当于宝泉岭组,发育低位体系域、湖侵体系域和高位体系域,煤层主要发育高位体系域中后期,成煤环境以滨浅湖淤积沼泽为主。层序SII相当于富锦组,主要发育湖侵体系域、高位体系域,局部地区发育低位体系域,煤层亦主要发育高位体系域中后期,成煤环境以扇三角洲淤积沼泽和滨浅湖淤积沼泽为主。层序SI、SII的高位体系域中后期,盆地基底沉降速率和物源供给处于相对平衡状态,主要发育了扇三角洲淤积沼泽、滨浅湖和滨浅湖淤积沼泽环境,发育可采煤层。  相似文献   

王坡井田煤层气井部署方法研究     

杜志强  吴艳  张妙逢 《中国煤炭地质》2014,(9):24-26

王坡煤矿是高瓦斯矿井,已有的井下瓦斯抽排不能满足矿井安全生产的要求,迫切需要通过地面抽采来缓解。在已有地质成果基础上,采用煤层气藏数值模拟方法,对王坡井田地面煤层气抽采工程部署方案进行优化。结果表明:A区块是井田煤层气开发试验首选区,以梅花形井网作为试验井网,井间距300m×250m,井网长轴方向60°。这种布井方式在工程实践中取得了较好效果,具有较大的推广价值。  相似文献   

平朔矿区杨涧煤矿90102工作面底板堵截技术研究     

张仲斌  李华  李文钧  徐智敏  王蓉蓉 《中国煤炭地质》2014,(12):54-57

杨涧煤矿90102工作面底板隔水层厚度约50m,隔水层底板奥灰水压约1.8MPa,经煤矿开采该工作面揭露5个陷落柱,运输顺槽230~290m发生底鼓并多处开裂涌水,分析水源为底部砂岩水,底板隔水层发育的裂隙在近距离厚煤层回采条件下,必将加剧其底板破坏,为确保工作面安全开采,有必要实施底板堵截工程。为此,在矿区岩溶陷落柱发育规律探查、底鼓监测条件下,以XL1陷落柱和底鼓区为例,针对柱体下段、底板破坏带,采用水泥浆液来截断底板出水补给来源的同时加固底板隔水层强度。经钻探验证堵截效果较好。最后对治理方案、注浆层段、注浆参数等进行了详细总结,形成了适用于朔州矿区的注浆堵截技术,可为指导矿区今后防治水实践提供借鉴。  相似文献   

On the topography influence on subsidence due to horizontal underground mining using the influence function method     

《Computers and Geotechnics》2014

The classical influence function method is widely used in mining subsidence prediction, but its use is typically limited to predicting the subsidence associated with horizontal stratiform underground mining when the ground surface is flat. By investigating the topography influence on subsidence under simplified mining conditions, this study attempts to improve the original influence function method to take topographic variations into account. New asymmetrical influence functions are used to simulate element subsidence. Integrating this asymmetrical approach into the influence function method increases the realism of subsidence computation when compared to the numerical simulation results. The maximum subsidence value and influence angle got from field data are introduced into the improved method, then two field subsidence cases are studied and acceptable comparison results are achieved. This improved method should serve as the foundation for future work.  相似文献   

Experimental Investigation on the Basic Law of Hydraulic Fracturing After Water Pressure Control Blasting     

Bingxiang Huang  Pengfeng Li  Jian Ma  Shuliang Chen 《Rock Mechanics and Rock Engineering》2014,47(4):1321-1334

Because of the advantages of integrating water pressure blasting and hydraulic fracturing, the use of hydraulic fracturing after water pressure control blasting is a method that is used to fully transform the structure of a coal-rock mass by increasing the number and range of hydraulic cracks. An experiment to study hydraulic fracturing after water pressure blasting on cement mortar samples (300 × 300 × 300 mm³) was conducted using a large-sized true triaxial hydraulic fracturing experimental system. A traditional hydraulic fracturing experiment was also performed for comparison. The experimental results show that water pressure blasting produces many blasting cracks, and follow-up hydraulic fracturing forces blasting cracks to propagate further and to form numerous multidirectional hydraulic cracks. Four macroscopic main hydraulic cracks in total were noted along the borehole axial and radial directions on the sample surfaces. Axial and radial main failure planes induced by macroscopic main hydraulic cracks split the sample into three big parts. Meanwhile, numerous local hydraulic cracks were formed on the main failure planes, in different directions and of different types. Local hydraulic cracks are mainly of three types: local hydraulic crack bands, local branched hydraulic cracks, and axial layered cracks. Because local hydraulic cracks produce multiple local layered failure planes and lamellar ruptures inside the sample, the integrity of the sample decreases greatly. The formation and propagation process of many multidirectional hydraulic cracks is affected by a combination of water pressure blasting, water pressure of fracturing, and the stress field of the surrounding rock. To a certain degree, the stress field of surrounding rock guides the formation and propagation process of the blasting crack and the follow-up hydraulic crack. Following hydraulic fracturing that has been conducted after water pressure blasting, the integrity of the sample is found to be far lower than after traditional hydraulic fracturing; moreover, both the water injection volume and water injection pressure for hydraulic fracturing after water pressure blasting are much higher than they are for traditional hydraulic fracturing.  相似文献