地化录井技术在低渗透油层解释评价中的应用

鄂尔多斯盆地中生界石油资源丰富,但油藏类型以隐蔽岩性油藏为主,储集层物性差、非均质性强,利用常规录井资料和测井参数很难准确判别油层.现场试验表明,利用地化录井技术判别油层具有比较独特的优势.通过对环县-贺旗地区长6-长8段油层进行综合分析,利用地化录井参数结合物性参数进行综合判别,分别建立(S0 S1)/S2、孔隙度与热解烃总量的解释图板,尝试对低渗透油层进行解释,最终解释结论与试油资料进行对比,其效果明显,解释符合率达到72%以上,能够满足现场快速评价储集层的要求.

The application of geochemical logging technology in the interpretation and evaluation in low permeability oil formation

Mesozoic crude oil resources in Erdos Basin is plenty, however the oil reservoir type is dominated by concealed lithologic oil reservoir with poor physical properties and strong heterogeneity, it is hard to accurately distinguish oil bed by using the conventional drilling fluid logging data and wireline logging parameters. The geochemical logging technology showed the unique advantages in oil bed distinguishing by site experiment. By comprehensively analyzing the intervals of Chang 6, 7 and 8 oil reservoir in Huan County to Heqi area and distinguishing it by combining geochemical logging parameters with physical parameters, the interpretation charts of (S0+S1)/S2, porosity and total quantity of pyrolysis hydrocarbon were respectively established, which were attempted to carry out interpretation on the low permeability oil bed, its effect was obvious in comparing the final interpretation conclusion with oil testing data, the interpretation coincidence rate reached to more than 72%, and can meet the requirement of wellsite fast evaluating reservoir.