声波变密度测井地层波能量的孔隙校正方法研究

利用声波变密度测井资料进行水泥胶结质量评价时,声波全波列中的地层波能量大小可实现对二界面固井胶结质量的定量评价。地层孔隙发育时,二界面固井胶结质量评价受到的影响较大,故利用地层波能量进行二界面定量评价时需要考虑地层孔隙的影响。通过建立套管井声波正演模型,开展套管井声波数值模拟,建立地层波能量与孔隙的关系,利用校正后的地层波能量评价二界面固井胶结质量,消除了地层孔隙发育对地层波能量的影响,提高二界面固井胶结质量定量评价的精度和准确性,为下一步制定油气井工艺措施的科学性和精确性提供依据。

Method of porosity correction for formation wave energy in acoustic variable density logging

When using the acoustic variable density log(CBL/VDL)data to evaluate the cement bond quality,the formation wave energy of acoustic full waveform can be applied to achieve quantitative evaluation of the secondary interface. When the formation porosity develops, the cementing quality evaluation of the secondary interface can be greatly affected, so the influence of the formation porosity should be taken into account in the quantitative evaluation of the secondary interface by using the formation wave energy. By establishing the acoustic forward modeling model of casing wells, the acoustic wave numerical simulation of casing well was carried out, the formation wave energy and the relationship between the pore was established. By making use of the formation wave energy after correction, the cementing quality of the secondary interface was evaluated,the influence of the formation wave energy on formation pore development was eliminated, the precision and accuracy of the cementing quality of the secondary interface was improved, which provides a basis for the scientific and accurate development of oil and gas well technology measures in the next step.