鄂尔多斯盆地大牛地气田盒2+3气藏特征

Gas reservoirs analysis of the He 2+3 member of Lower Shihezi Formation at Daniudi gas field in Erdos Basin

目的 盒2+3气藏是鄂尔多斯盆地北部塔巴庙地区大牛地气田的主力气藏,分析和研究气藏特征可为以后的勘探开发提供可靠依据。方法 从储层、流体及综合测井等3个方面对气藏特征进行分析研究。结果 盒2+3气藏为岩性圈闭型气藏,发育分流河道微相沉积环境,属于低孔隙度、低渗透率的非均质性储层,孔隙类型主要以粒间和粒内溶孔为主;盒2+3气藏为无水、极少量油的干气型气藏,其储集岩自身没有生气能力,纵向上距气源较远;在综合测井响应特征方面,其主要特征是高产井的深侧向电阻率值相对较高,可通过电阻率求取产能预测公式来预测产能。结论 认识了该气藏的特征,为该气田下一步高效勘探开发工作奠定了基础。

AimThe gas reservoirs of the He 2+3 member of lower Shihezi Formation is a main gas reservoirs in Daniudi gas field.Analysing its gas characters may offer trusty helpful for exploration and development in future.MethodsThrough analysing three major characteristics of the reservoir, three conclusions are made.ResultsFirstly,the gas reservoirs is a lithologic trop controlled by sedimentary environment of river, belonging to a low porosity and low permeability reservoirs.Secondly,it is a dry gas reservoirs of no waters and few oils. The reservoirs self have no ability of producing gas,or have a far distance of gas root reservoirs. Finally, on the all-around well log, the more the producibility, the more resistivity is.At the same time,through analysing resistivity to make pressions, it is helpful for predict producibility.ConclusionThe study and analysis on the character of the Daniudi He 2+3 gas reservoir become the base for exploration and development of the reservoir more efficiently later.