涪陵气田焦石坝区块页岩气储层储集空间特征及其定量评价

Reservoir Space Characteristics and Quantitative Evaluation of Shale Gas Reservoir at Jiaoshiba Area in Fuling Gas Field

四川盆地涪陵气田焦石坝区块上奥陶统五峰组—下志留统龙马溪组一段海相页岩气储层是由孔隙和裂隙组成的双孔隙岩层。为确定储层的含气量和产出能力,应用页岩气测井评价技术对储层的孔隙度和渗透率进行了定性认识,并提出了定量评价方法。认为用"经验统计法"可以有效计算出页岩气储层的孔隙度,但由目前的测井评价技术所得到的渗透率仅能反映储层渗透率的变化趋势。

Upper Ordovician Wufeng to Lower Silurian Longmaxi Member-1 marine shale gas reservoir is developed at Jiaoshiba area of Fuling Gas Field, Sichuan Basin. The reservoir shale is of rich pores and crevices as well as fractures that are favorable to gas accumulation. On account of applying the logging evaluation technique, microscopic characteristics of shale reservoir space(porosity and permeability) is qualitatively revealed and some methods of quantitative evaluation of reservoir space are introduced in order to ascertain gas content and deliverability. It is outlined that although the porosity of shale gas reservoir can be counted out by the experienced statistical method, the permeability taken by the logging evaluation technique only reflects a change trend of it in shale reservoir.