| 山西沁水盆地某煤层气区块储层特征及敏感性评价 |
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| 引用本文： | 赵彦宏.山西沁水盆地某煤层气区块储层特征及敏感性评价[J].中国煤炭地质,2020(3):34-38. |
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| 作者姓名： | 赵彦宏 |
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| 作者单位： | 山西兰花煤炭实业集团有限公司 |
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| 基金项目： | 十三五国家重大科技专项(编号:2016ZX05045)资助。 |
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| 摘 要： | 与常规油气储层相比,煤层气储层往往具有低孔、低渗、低压、吸附性强以及裂隙发育等特点,在勘探开发过程中容易造成比较严重的储层损害。因此研究煤层气储层特征及敏感性,找出储层潜在损害因素,对预防储层损害具有十分重要的意义。以沁水盆地某煤层气区块为研究对象,采用X射线衍射、压汞实验以及测井资料分析等手段对储层特征进行了研究,结果表明,目标区块煤储层显微组分以镜质组为主,惰质组含量较少,不含壳质组;黏土矿物含量在7.5%左右,以蒙脱石为主;储层孔隙度、渗透率以及孔隙直径均较小,物性较差。储层敏感性实验评价结果表明,速敏损害程度为中等偏强,水敏损害程度为强,碱敏损害程度为弱,酸敏损害程度为中等偏弱至中等偏强,应力敏损害程度为强。基于以上研究结果,开发出了适合目标区块煤储层的钻井液体系和压裂液体系,均具有良好的储层保护性能,能够满足煤层气储层钻井和压裂施工的需要。
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| 关 键 词： | 煤层气 储层特征 敏感性 储层保护 沁水盆地 |
Reservoir Features and Sensitivity Assessment of a CBM Block in Qinshui Basin,Shanxi |
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| Zhao Yanhong.Reservoir Features and Sensitivity Assessment of a CBM Block in Qinshui Basin,Shanxi[J].Coal Geology of China,2020(3):34-38. |
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| Authors: | Zhao Yanhong |
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| Institution: | (Shanxi Lanhua Coal Industry Group Co.Ltd.,Jincheng,Shanxi 048000) |
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| Abstract: | Comparing with conventional oil and gas reservoirs CBM reservoir usually has features of low porosity,low permeability,low pressure,strong adsorptivity and developed fissures.During the exploration and exploitation processes can cause rather serious reservoir damages easily.Thus to study CBM reservoir features and sensitivity,find out reservoir potential damage factors have fundamental significance in damage prevention.Taking a CBM block in the Qinshui Basin as subject investigated,using X-ray diffraction,mercury intrusion porosimetry and well logging data analysis carried out reservoir features study.The result has shown that coal reservoir macerals in the target block are mainly vitrinite,less inertinite and without exinite.Clay minerals content is about 7.7%,mainly montmorillonite.Reservoir porosity,permeability and pore diameter are all smaller with poorer physical properties.Reservoir sensitivity experimental assessment results have shown that the damage extent of velocity sensitivity is medium on weak side to medium on strong side;of water sensitivity is strong;of alkali sensitivity is weak;of acid sensitivity is medium on weak side to medium on strong side;of stress sensitivity is strong.Based on the above studied results have developed coal reservoir drilling flush fluid and fracturing fluid systems propitious to target block.They all have better reservoir protection performance,and satisfied to CBM reservoir drilling and fracturing operation demands. |
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| Keywords: | CBM reservoir features sensitivity reservoir protection Qinshui Basin |
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