Petroleum Exploration and Production Research lnstitute,SINOPEC

针对鄂尔多斯盆地东南缘延川南区块二叠系山西组2号煤层埋深大,煤储层为特低渗,压力系数和地温梯度低,煤层气上产缓慢的问题,通过对该区块大量基础资料开展深煤储层精细描述,基于建立的测井曲线定量划分煤体结构标准,结合部分探井岩心观察,将延川南气田山西组2号主力煤层煤体结构划分为原生结构煤、碎裂结构煤和碎粒结构煤3种。根据气田试采产量拟合不同煤体结构厚度发现,碎裂结构煤次生裂隙发育,渗透性好,单井产气量高,其中碎裂结构煤厚度大于1 m的次生裂隙发育区为最有利高产区,煤层产气效果好,可通过持续稳定排采实现面积降压,以达到提高单井产量的目的。

According to the problems of the high depth,ultra low permeabity of the coal reservoirlow pressure co.eficient and geothermal radientcoalbed methane production slow occurred in No. 2 seam of Permian ShanxiFormation in Yanshuangnan Block at the Southeast edge of Ordos Basin.itfine description of the deep coal reservoir conducted on the great basic information of the block, based on the establishment of the coal structure standard quantitative divided with the logging curve,in combination with the observation of the parial ogging rock core,the coal structure of No.2 major seam inShanxiformation of Yanchuannan gas field was divided to the primary structure cal fractured structure coal and broken partical structure coal .According to the trial drainage production of the gas fel.,th fited diferent coal structure thickness found that the second crack of the fractured structure coal was developed,the permeability was good and the single well gas production was high.Among them the second crack developed zone with the t ickness of the broken structure coal more than1 m was the most favorable high production zone.T'he gas production effect of the sean was good and the sustainable and stable drainage could realize the area reduced,so as to improve the production of single wel.

中国石化科技攻关资助项目(G580015ZSYTB034)；