民和盆地窑街矿区窑街组页岩储层含气性及地化特征

Yaojie Formation Shale Reservoir Gas-bearing and Geochemical Characteristics in Yaojie Mine Area, Minhe Basin

窑街矿区中侏罗统窑街组发育油页岩、炭质泥岩、暗色泥岩和煤层,均是较好的气源岩,其中成烃母质以油页岩最佳。实测油页岩含气量为0.88-1.96 m3/t,平均1.35 m3/t;TOC含量为0.75%-42.31%,平均11.08%,有机质类型与热成熟度匹配较好。民和盆地与一些大型页岩气盆地相比储层的含气性及地化特征相似,页岩分布面积虽较小,但烃源岩厚度大、含气量和资源丰度高,综合评价认为页岩气具有较好的开发前景。

Oil shale, carbonaceous mudstone, dark mudstone and coal seams are well developed in the middle Jurassic Yaojie Formation, Yaojie mine area Minhe Basin. They are all excellent gas source rocks, in which oil shale is the best hydrocarbon generating parent material. Measured oil shale gas content is 0.88-1.96 m3/t, average 1.35 m3/t; TOC 0.75%-42.31%, average 11.08%. The adaption of organic matter and thermal maturity is preferable.Comparison the Minhe Basin with some large-sized shale gas basins, gas-bearing property and geochemical features have similarities.The former has rather small shale distribution area, but larger source rock thickness, higher gas content and resource abundance.The overall assessment has considered that the area＇s shale gas has preferable exploitation prospect.