收稿：2020-12-24，
纸质出版：2021-10-28
移动端阅览
鄂尔多斯盆地庆城油田是中国发现的首个页岩油10亿吨级大油田，水平井体积开发是页岩油效益开发的关键技术。文中提出了一种细分切割体积压裂缝网波及体积计算模型，应用多元线性回归的方法建立了关键地质工程参数与微地震覆盖体积关系式，进一步利用矿场实际产量数据对关系式进行校正，建立了缝网波及体积定量表征经验公式，进而绘制了其与产能的相关性图版，为体积压裂工程参数优化给予指导。研究结果表明：鄂尔多斯盆地页岩油体积改造裂缝总体呈现以主裂缝为主、分支缝为辅的条带状缝网形态，形似“仙人掌”。影响缝网波及体积的主控因素依次为入地液量、裂缝密度、排量、油层厚度和砂量。经矿场实践证实，该研究建立的经验公式及相关性图版预测结果准确、可靠，可为庆城油田页岩油水平井体积压裂优化设计及效果评价提供科学依据。
Qingcheng oilfield in the Ordos Basin is the first shale oilfield with over one-billion tons of reserves discovered in China.Volume fracturing of horizontal well is a key technology for effective development of shale oil in the oilfield.In this study
a fracture network swept volume (
FSV
) model for volume fracturing is built
the relation between key geologic and engineering parameters and microseismic coverage volume is established by multivariate linear regression
actual production data are applied to correct the relation to get an empirical formula for quantitative calculation of
FSV
and then the correlation template between
FSV
and productivity is plotted to guide the optimization of engineering parameters of volume fracturing.The results show that fractures created during the volume fracturing of shale oil reservoirs appear as a stripped fracture network dominated by main fractures together with branch fractures in the shape of cactus; and the main factors affecting
FSV
include fracturing fluid volume
fracture density
pumping rate
oil layer thickness
and proppant load.Field practices prove that the empirical formula and correlation template proposed in the study can predict
FSV
with accuracy and provide scientific basis for design optimization and effect evaluation of volume fracturing of horizontal shale oil well in Qingcheng oilfield.
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