摘要
煤系本身及其上覆地层能够形成具有工业开发价值的致密砂岩和页岩气藏,综合勘探这些非常规天然气资源将有助于提高煤层气开发效益。依托17口井的气测录井资料,分析了沁水盆地南部石炭二叠纪煤系及其上覆地层致密砂岩和页岩的气测显示规律,讨论了致密砂岩气与页岩气的赋存方式和勘探前景。结果显示:区内砂岩和页岩的气测显示十分普遍,区域和层位显示差异较大;砂岩气发现几率相对较高,页岩气品位相对较好;下石盒子组具有砂岩气和页岩气的勘探潜力,太原组具有页岩储层厚度品位,山西组具有砂岩储层厚度品位。研究认为,页岩气最有利勘探层位为太原组,砂岩气最有利层位是下石盒子组,山西组也有一定的砂岩气和页岩气勘探潜力。以此为基础,初步划分出独立砂岩气、独立页岩气、煤-页岩-砂岩互层气组合3种气藏类型,认为砂岩气和页岩气有利区主要位于盆地中央地带,总体上沿复向斜轴部呈NNE向展布。其中,沁源区块中—南部、郑庄区块-马必区块-沁南区块结合部、柿庄北区块西北部3个核心区值得关注。
Tight sandstone and shale gas reservoirs with commercial value can occur in coal measures and its overlying strata,and the integrated exploration of these unconventional gas resources will help to improve the efficiency of the coalbed methane development.Based on the gas logging data from 17 wells,the gas shows of the tight sandstones and shales in the Permo-carboniferous coal measures and its overlying strata from southern Qinshui basin were investigated,and the occurrence and exploration prospects of the gas resources were discussed.It is turned out that the gas logging show of the sandstones and shales in the basin is widespread,but there is a large difference in region and horizon showed.The gas show has a relatively high probability in the sandstones and relatively good grade in the shales.Lower Shihezi formation has the exploration potential of the sandstone and shale gas,the Taiyuan formation has a grade advantage of the reservoir thickness in shale,and the Shanxi formation in sandstone.Investigation showed that the most favorable exploration hori-zon for shale gas occurs in Taiyuan formation,for sandstone gas in the Lower Shihezi formation,and the Shanxi formation also has a certain exploration potential of sandstone and shale gases.On this basis,three types of gas reservoir was preliminarily distinguished including the independent sandstone gas,independent shale gas and interbeded coalbed-shale-sandstone gas reservoirs.Investigation showed that the gas favorable area might occurs in the central belt of the basin with a NNE strike along the synclinore axis as the whole.Among them,three core blocks are worthy of attention,including the central and southern Qinyuan,bond zone among Zhengzhuang,Mabi and south Qinnan,and northwestern Shizhuangbei.
出处
《煤炭学报》
EI
CAS
CSCD
北大核心
2014年第8期1559-1565,共7页
Journal of China Coal Society
基金
国家自然科学基金重点资助项目(U1361207)
山西省煤层气联合基金资助项目(2012012001)
国家科技重大专项资助项目(2011ZX05034)
关键词
沁水盆地
致密砂岩气
页岩气
气测显示
气藏类型
石炭二叠系
Qinshui Basin
tight sandstone
shales
gas logging shows
gas reservoir types
permo-carboniferous
