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延长组长6段是鄂尔多斯盆地白豹地区的主要含油层位,储层岩性为近深湖相带薄而致密的泥质粉砂岩,其中大量发育的滑塌沉积进一步增加了储层非均质性和评价难度;为建立适合长6储层的油水识别标准及方法,从粘土成分、成岩作用、孔隙结构、地层水矿化度4方面分析其测井特征的影响因素,在143口井长6段试油资料标定下,分析含油性与测井参数或测井组合参数的响应关系。结果表明选用综合反映储层物性特征的组合参数(△t×(USP/SSP)×(1-△GR))与深感应曲线LID(地层真电阻率Rt)制作交会图,能较好的区分出油层与非油层;在此基础上编制AC-Rt交会图可进一步将水层、干层和个别油水同层逐次区分,达到有效定性区分油、水层为油田射孔选层提供依据。
Yanchang Formation Member 6 is the main oil-bearing layer in Baibao area, Ordos Basin. The lithology of the reservoir is thin and dense muddy siltstone near the deep lacustrine facies, and a large number of developed slump deposits further increase the reservoir non-uniform Quality and evaluation difficulty. In order to establish the oil-water identification standard and method suitable for Chang 6 reservoir, the influencing factors of logging characteristics are analyzed from clay composition, diagenesis, pore structure and formation water salinity. In 143 wells Long 6 section test oil calibration, analysis of oil and logging parameters or logging combination of response parameters. The results show that it is better to make a cross-plot by using composite parameters (Δt × (USP / SSP) × (1- △ GR)) and deep response curve LID (real resistivity Rt) that comprehensively reflect the physical properties of the reservoir. Oil and non-oil reservoirs. On this basis, the AC-Rt cross-plot can further distinguish the water layer, the dry layer and the individual oil-water layers one after another to achieve the effective qualitative distinction between oil and water layer for the perforation of the oil field.