页岩气资源量计算:以鄂尔多斯盆地中生界三叠系延长组长7为例

摘要

鄂尔多斯盆地三叠系延长组长7暗色泥页岩是重要的烃源岩.最近的勘探表明,长7具有良好的页岩气开发前景.重点利用鄂尔多斯盆地279口测井资料、18口取心井的347块岩样实验室多种分析测试资料,开展了鄂尔多斯盆地中生界延长组长7页岩气的岩性、岩相、孔隙类型、有机碳含量、热演化程度、含气性、气体储存方式及其在测井曲线的反响研究；在页岩气形成条件的研究基础上,建立了岩性、含气性、有机质含量与自然伽马、声波时差、电阻率之间的关系,有效地识别含气泥页岩；选择容积法对延长组页岩气资源量进行计算,为未来页岩气的勘探和开发奠定基础.%The Mesozoic Triassic Yanchang Formation Chang 7 shale in Ordos Basin is an important hydrocarbon source rock and recently has developed into a very active point in shale gas exploration.The goal of the study is to estimate the shale gas resources.On the basis of 279 wells logging data,geological and geochemical database consisting of 347 core samples from 18 core wells of this area,we conducted an overall analysis of lithology,petrofacies,porosity,total organic carbon (TOC) content,thermal maturity and gas content for the Chang 7 gas shale and studied the response of logging curves to the patterns of gas reservoir.On the basis of the study of the forming conditions of the gas shale the present paper builds up the quantitative relationship between TOC and logging data,including acoustic time logging,natural gamma ray logging and resistivity logging.We use volumetric method to estimate the shale gas resources.The results will lay a foundation for the exploration and exploitation of shale gas in the future.