织金珠藏次向斜煤层含气量分布特征及影响因素研究  被引量:6

Distribution characteristics and influential factors of coalbed methane content in Zhuzang subsyncline of Zhijin area

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作  者:马伟竣[1] 

机构地区:[1]中国石化华东分公司石油勘探开发研究院,江苏南京210011

出  处:《油气藏评价与开发》2014年第3期64-67,共4页Petroleum Reservoir Evaluation and Development

摘  要:从构造、沉积、水文地质等方面入手对织金珠藏次向斜多煤层含气量的影响因素进行探讨。煤层气含气量的影响因素主要为构造、煤层厚度,其次为顶底板岩性和水文地质条件。宽缓的向斜构造,构造变形相对较弱,有利于煤层气的保存,含气量分布平面上具有"轴部高、两翼低"的特点;潮坪—三角洲—泻湖的海陆过渡沉积体系造成了龙潭组上、下段煤层较发育,海平面的高频振荡形成了"多、薄"煤层的特点;以泥岩、泥质粉砂岩、粉砂岩为主的顶底板封盖条件好;龙潭组整体含水性弱,具有独立的水文地质单元,煤层气保存条件好,有利于煤层气富集。Starting from structure, deposition and hydrologic geology, this paper detailedly discussed coalbed methane content in Zhuzang subsyncline of Zhijin County. The main influential factors are structure and coalbed thickness. While the secondary fac-tors are adjacent rock lithology and hydrogeologic conditions. The trapped synclinal structure with weak deformation is conducive to CBM preservation. The gas distribution in the plane is high on the axis and low on the two wings. Sea-land transitional deposi-tional system of tidal flat-delta-lagoon makes the better development of coalbed in the upper and the bottom of Longtan formation. High-frequency oscillation of sea level forms many thin coalbed. Adjacent rock mainly consists of mudstone, argillaceous siltstone, siltstone has great sealing conditions. Longtan formation with weak aquosity has independent hydrogeologic unit for the great preser-vation conditions of CBM.

关 键 词:织金 珠藏次向斜 煤层气 含气量 

分 类 号:TE122.11[石油与天然气工程—油气勘探]

 

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