油气藏评价与开发
油氣藏評價與開髮
유기장평개여개발
2014年
2期
70-75
,共6页
彬长区块%低阶煤层气%成藏特点
彬長區塊%低階煤層氣%成藏特點
빈장구괴%저계매층기%성장특점
Binchang block%low-rank coalbed methane (CBM)%reservoir formation characteristics
鄂尔多斯盆地彬县-长武地区（以下称“彬长地区”）的低煤阶煤层气资源量丰富，勘查程度较高。与高煤阶煤层气成藏特征相比，低煤阶由于热演化程度较低，生气量受到构造演化史、沉积相的限制，同时保存条件影响了煤层气成藏。阐述了彬长地区低煤阶煤层气基本地质条件，并且从构造、沉积和水动力条件三个方面分析了低煤阶煤层气成藏特点。通过研究认为侏罗系延安组8号煤是彬长区块的主要目标层位，而且厚度较大，渗透性较好，尤其是研究区中南部的8号煤层又具有有利的盖层条件，是煤层气的富集区。
鄂爾多斯盆地彬縣-長武地區（以下稱“彬長地區”）的低煤階煤層氣資源量豐富，勘查程度較高。與高煤階煤層氣成藏特徵相比，低煤階由于熱縯化程度較低，生氣量受到構造縯化史、沉積相的限製，同時保存條件影響瞭煤層氣成藏。闡述瞭彬長地區低煤階煤層氣基本地質條件，併且從構造、沉積和水動力條件三箇方麵分析瞭低煤階煤層氣成藏特點。通過研究認為侏囉繫延安組8號煤是彬長區塊的主要目標層位，而且厚度較大，滲透性較好，尤其是研究區中南部的8號煤層又具有有利的蓋層條件，是煤層氣的富集區。
악이다사분지빈현-장무지구（이하칭“빈장지구”）적저매계매층기자원량봉부，감사정도교고。여고매계매층기성장특정상비，저매계유우열연화정도교저，생기량수도구조연화사、침적상적한제，동시보존조건영향료매층기성장。천술료빈장지구저매계매층기기본지질조건，병차종구조、침적화수동력조건삼개방면분석료저매계매층기성장특점。통과연구인위주라계연안조8호매시빈장구괴적주요목표층위，이차후도교대，삼투성교호，우기시연구구중남부적8호매층우구유유리적개층조건，시매층기적부집구。
Binchang block of Ordos basin has abundant low-rank coalbed methane (CBM) and high exploration degree. Because of low thermal evolution degree, compared with forming characters of high-rank CBM, gas generation content of low-rank CBM is re-stricted by structural evolution history and sedimentary facies. Meanwhile, preservation conditions affect CBM accumulation. This paper described the basic geological condition of low-rank CBM in Binchang block and analyzed its forming characters from three aspects, such as structural environment, deposition condition and hydrodynamic condition. The research shows that No.8 coalbed of Jurassic Yan’an formation is the main target stratigraphic position. Having the advantages of large coalbed thickness and high per-meability, especially No.8 coalbed possessing favorable conditions of forming capping formation, it is the enrichment region of CBM.
