CAJ | 학술논문

煤层气储盖组合在一定程度上控制煤层气的保存条件。依据煤层顶(底)板的封盖能力，将鄂尔多斯盆地东缘煤层气储盖组合划分为4种类型。优势储盖组合主要发育于保德—临县地区太原组泻湖、潮坪相带以及大宁—吉县地区山西组滨浅湖相带，对煤层气的封盖能力强。次优势储盖组合主要发育于保德—河曲地区太原组、石楼—三交地区山西组以及韩城—合阳地区三角洲前缘相带，对煤层气的封盖能力较强。一般储盖组合主要发育于三交—吉县地区太原组浅海陆棚相带、保德—临县地区山西组三角洲平原、河流泛滥盆地相带，对煤层气的封盖能力较弱。不利储盖组合主要发育于河曲以北山西组辫状河上游、冲积扇相带，对煤层气的封盖能力差；煤层气储盖组合类型在一定程度上控制煤储层含气量分布，是煤储层含气性预测的重要参考依据。
매층기저개조합재일정정도상공제매층기적보존조건。의거매층정(저)판적봉개능력，장악이다사분지동연매층기저개조합화분위4충류형。우세저개조합주요발육우보덕—림현지구태원조사호、조평상대이급대저—길현지구산서조빈천호상대，대매층기적봉개능력강。차우세저개조합주요발육우보덕—하곡지구태원조、석루—삼교지구산서조이급한성—합양지구삼각주전연상대，대매층기적봉개능력교강。일반저개조합주요발육우삼교—길현지구태원조천해륙붕상대、보덕—림현지구산서조삼각주평원、하류범람분지상대，대매층기적봉개능력교약。불리저개조합주요발육우하곡이북산서조변상하상유、충적선상대，대매층기적봉개능력차；매층기저개조합류형재일정정도상공제매저층함기량분포，시매저층함기성예측적중요삼고의거。
The preservation conditions of CBM are controlled by the reservoir-cap formation type to some extent. By analyzing the seal capacity of the seam roof and floor, CBM reservoir-cap formation type in the eastern margin of Ordos basin can be divided into 4 types. The first best reservoir-cap combination type is mainly developed in Taiyuan Formation in Baode - Lin Counties, and Shanxi Formation in Daning - Ji Counties, the former Formation is characterized by lagune- tidal flat facies, the latter Formation is shallow lake facies, which is favorable for CBM preservation. The second com-bination type is chiefly developed in Taiyuan Formation in Baode-Hequ area, Shanxi Formation in Shilou - Sanjiao area, and the above two formations in Hancheng – Heyang area, the sedimentation is of delta front facies, which is relatively good for CBM preservation. The third combination type developed in Taiyuan Formation in Sanjiao – Ji counties is con-tinental shelf facies, and in Shanxi Formation in Baode –Lin counties is deltaic plain and flood-plain facies, these deposi-tion types have weak sealing ability for CBM. The fourth and the poorest combination type is distributed in Shanxi For-mation in the region north of Hequ area, whose deposition is upstream of braided river facies and alluvial fan facies, which is not favorable for CBM preservation. The reservoir-cap formation types are closely related to the gas concentra-tion in the study area, so it is one important reference to forecast CBM abundance of the coal reservoir.