渤海湾盆地石炭-二叠系页岩气资源分布特征研究

Distribution characters of Carboniferous-Permian shale gas in Bohai Bay Basin

渤海湾盆地石炭-二叠系是我国重点海陆过渡相页岩气目的层系,具备一定成气条件和基础。本文通过沉积和地球化学特征分析认为泥页岩有机碳含量相对较高,太原组好于山西组;整体演化程度比较高,太原组高于山西组,均处于有利生气范围之内;有机质类型以Ⅱ2-Ⅲ型为主,有利于生气。建立了海陆过渡相页岩气有利区优选标准,重点优选了济阳坳陷有利区,有利区总面积1675km2,主要分布在车镇凹陷西部、惠民凹陷南部、东营凹陷南部等地区。石炭-二叠系太原组、山西组海陆过渡相碳质泥岩是页岩气发育的有利层段,整体上以聚集页岩气为主,具备形成页岩气藏的物质基础、储集条件和资源潜力。

The Permo‐Carboniferous strata of Bohai Bay Basin ,the transitional facie ,are the most important shale gas target strata in China which have a geologic gas accumulation condition . The sedimentary and geochemical characters show that the shale has a higher organic carbon and evolution degree .Overall ,the organic geochemical characteristics of Taiyuan Group are better than those of Shan Xi Group ,and the organic type is mainly Ⅱ2‐Ⅲ which is in the pale of gas generating range .The optimization standard of favorable zone of shale gas in transitional facie is established in this study . The Jiyang Depression is selected as the advantageous area ,its total payable acreage is 1675km^2 ,mainly distribute in the west of Chezhen Sag ,south of Huimin Sag and south of Dongying Sag .All the evidences proved that the carbonaceous mudstone of Permo‐Carboniferous strata is the favorable bed for shale gas generation and accumulation ,and it has the potential for shale gas exploration .