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大庆油田外围地区塔20井第8层等油(气)层电阻率比较低(52Ωm以下),按常规解释方法,判断为水层或油水同层。射孔后出纯油,甚至自喷,产量高达18.34m~8/d,且不含水。对这些层岩心分析的结果表明,储油层电阻率低的主要原因在于砂岩含有自生粘土矿物伊利石并呈搭桥式产状。在利用测井资料评价低电阻率储集层时,可用密度-中子孔隙度交会图估计粘土矿物的成分,然后再根据地层埋藏深度估计粘土矿物的产状。对于这类地层油水层界限值V_(wf)应增大到0.12。此外,综合研究其它录井资料以及地质、构造特征,对正确评价低阻油气层也是必要的
In the outer area of Daqing Oilfield, the oil layer resistivity of layer 8 of tower 20 is relatively low (less than 52Ωm). According to the common interpretation method, it is judged as the water layer or the oil-water layer. Perforated after a pure oil, or even spray, the output as high as 18.34m ~ 8 / d, and does not contain water. The core analysis of these layers shows that the main reason for the low resistivity of reservoirs is that the sandstone contains illicit clay mineral illite and appears bridged. When using logging data to evaluate low resistivity reservoirs, the density-neutron porosity cross-plot can be used to estimate the composition of clay minerals and then to estimate the occurrence of clay minerals based on their depth of burial. The threshold V_ (wf) for this formation should increase to 0.12. In addition, a comprehensive study of other logging data, as well as geological and tectonic features, is also necessary for the correct assessment of low resistivity reservoirs