鄂尔多斯盆地东北缘叠置含气系统中菱铁质泥岩测井识别及地质意义

发布时间：2018-03-23 03:39

本文选题：菱铁质泥岩　切入点：含气系统　出处：《天然气地球科学》2017年04期 　论文类型：期刊论文

【摘要】：以鄂尔多斯盆地东北缘地区本溪组—山西组菱铁质泥岩为研究对象,对研究区钻孔岩心与测井资料采用逻辑判别、蛛网图等方法,量化了研究区菱铁质泥岩的测井识别特征,建立其测井识别模板。研究表明,菱铁质泥岩具有高光电吸收截面指数(PE)、高密度(DEN)、高自然伽马(GR)、低声波时差(AC)、低电阻率(M2RX)、低中子孔隙度(CNCF)的特征,研究区12口钻孔中的菱铁质泥岩识别结果表明,总厚度为3.9~25.4m,总层数为8~28层,区域分布不均;通过测井资料定量分析了菱铁质泥岩的物性及封盖性能,指出研究区菱铁质泥岩具低孔低渗性及高突破压力的特点,其平均渗透率为2.29×10~(-8)μm~2、平均有效孔隙度为1.20%、平均突破压力为12.32MPa,在叠置含气系统中具备隔水阻气性能。基于菱铁质泥岩的空间发育位置,沉积环境及形成过程分析,在本溪组山西组共识别出4个稳定隔水阻气层,结合气测资料将研究区本溪组—山西组垂向划分出5个独立含气系统,每个独立含气系统的边界便是区域分布稳定、连续性好且垂向发育具有一定规模的以菱铁质泥岩为主要岩层的隔层。
[Abstract]:Taking the rhombohedral mudstone of Benxi formation and Shanxi formation in the northeastern margin of Ordos Basin as the object of study, the logging identification characteristics of rhombohedral mudstone in the study area are quantified by using the methods of logical discrimination and cobweb map to the borehole core and logging data in the study area. The well logging identification template has been established. The results show that the rhombohedral mudstone has the characteristics of high photoelectric absorption cross section index (PEI), high density (DENU), high natural gamma ray (RG), low wave time difference (AC), low resistivity (M 2RX), and low neutron porosity (CNCFC). The identification results of rhombohedral mudstone in 12 boreholes in the study area show that the total thickness is 3.9 ~ 25.4 m, the total layer number is 8 ~ 28 layers, and the distribution is uneven, and the physical properties and capping properties of rhombotite mudstone are quantitatively analyzed by well logging data. It is pointed out that the rhombohedral mudstone has the characteristics of low porosity and low permeability and high breakthrough pressure. The average permeability is 2.29 脳 10 ~ (-8) 渭 m ~ (-2) 渭 m ~ (-2), the average effective porosity is 1.20 and the average breakthrough pressure is 12.32 MPa. It has the property of water insulation and gas resistance in the superimposed gas-bearing system. In the Shanxi formation of Benxi formation, four stable water and gas barrier reservoirs were identified, and five independent gas-bearing systems were divided into five independent gas-bearing systems in the vertical direction of Benxi formation and Shanxi formation combined with gas logging data. The boundary of each independent gas-bearing system is regional distribution stability. There is good continuity and vertical development of a certain scale of iron ribosite mudstone as the main strata of the interlayer.
【作者单位】：中国矿业大学煤层气资源与成藏过程教育部重点实验室;中国矿业大学资源与地球科学学院;中联煤层气有限责任公司;
【基金】：国家自然科学基金项目(编号:41102100;41541046;41672146) 国家科技重大专项项目(编号:2016ZX05044-002-001;2016ZX05066-001-004)联合资助
【分类号】：P618.13;P631.81

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