沁水盆地南部变质变形煤储层特征及煤层气富集区划分

沁水盆地南部周缘被挤压性断裂褶皱带所围限，区内缓坡带形成煤层气富集区。受中新生代区域构造—热演化影响，盆地内煤储层在深成变质作用基础上叠加了不同程度的构造动力变质作用和岩浆热变质作用，产生了不同程度的变质和变形，导致其在变质变形程度、含气性及渗透性等煤储层物性方面具有不同的特征，有明显的区域分异，形成展布方向与盆地复向斜主轴方向及燕山期岩浆侵入方向一致的3个北东—北北东向的煤层气富集区块：枣园—潘庄区块（TREND1）、寺底—成庄区块（TREND2）和郑庄区块(TREND3)。其含气量和渗透率具有明显的东西展布、南北分带的特征。从东向西TREND1、TREND2和TREND3富集的高渗条件依次降低。从南向北TREND1又可以细分为潘庄区块（1A）、枣园区块和胡底—蒲池区块（1B）以及樊庄区块（1C）。其中1A富集的高渗条件最好， 1B次之， 1C再次。

Characteristics of coal reservoirs and division of coalbed methane enrichment areas in the south of Qinshui Basin

The margin of the southern Qinshui Basin is confined by faulted fold belts，the enrichment region is formed in gentle slope area.By the affection of regional tectonic thermal evolution，the coal reservoirs have undergone the plutonic metamorphism，tectonic dynamic metamorphism and magmatic thermal metamorphism，and they were caused into different degrees of metamorphic and deformation.The reservoirs possess different characteristics in many aspects of physical properties，such as metamorphic and deformation，gas bearing capacity and permeability.They show obvious regional differentiation and form three NE NNE structural regions of coalbed methane pool，which have the same spreading direction with the direction of synclinorium spindle and magma intrusion in Yanshan period.The structural regions are Zaoyuan fanzhuang region(TREND1)，Sidi chengzhuang region(TREND2)and Zhengzhuang region(TREND3).Their gas content and permeability possess obvious distribution in EW and SN.From east to west，the gas content and permeability in TREND1，TREND2 and TREND3 reduce one by one.From south to north，the TREND1 can also be divided into three parts：Panzhuang block(1A)，Zaoyuan block and Hudi pichi block(1B)and Fanzhuang block(1C).The gas content and permeability is best in 1A，medium in1B，low in 1C.