页岩油井周地质甜点评价——以庆城油田为例

Evalution of Geological Sweet Spot Around Well in Shale Oil: Taking Qingcheng Oilfield as An Example

摘要

页岩油作为非常规油气勘探开发的重要领域之一，已经逐渐成为国内外各大油田主要研究对象。以庆城油田长7段为研究对象，其面临储层非均质性强、纵向隔夹层多、地质甜点刻画难等诸多问题。利用测井资料开展四性评价由来已久，能够从井筒对地质甜点进行定量表征，但随着勘探开发实践的不断深入，仅从井筒角度评价地质甜点已无法满足油田需求。针对这种情况，利用随钻伽马成像分析井眼轨迹与地层的位置关系并计算地层倾角，利用随钻电阻率探边判断地层边界范围、拾取井旁构造产状变化，利用随钻核磁实时精准测量储层孔隙度和流体饱和度，评价储层物性特征，形成了页岩油井周地质甜点评价技术。该技术在庆城油田页岩油水平井地质导向、射孔段簇优选中有着重要的指导意义，此研究思路和应用效果在其他非常规油气藏具有较好的推广价值。

Abstract

Shale oil, as one of the important fields in unconventional oil and gas exploration and development, has gradually become a major research object for domestic and foreign oilfields. We take the Chang 7 sections of the Qingcheng Oilfield as the research objects, which pose many difficulties such as strong heterogeneity of the reservoir, numerous vertical interlayers, and that in characterizing geological sweet spots. The four-property evaluation using logging data has a long history and can quantitatively characterize geological sweet spots from the wellbore. However, with the continuous deepening of exploration and development practices, the evaluation of geological sweet spots only from the wellbore perspective can no longer meet the needs of the oilfield. In response to this situation, the logging-while-drilling gamma imaging is used to analyze the positional relationship between the wellbore trajectory and the formation and calculate the formation dip angle. The logging-while-drilling resistivity probe is used to determine the boundary range of the formation and pick up the changes in the structural dip near the wellbore. The logging-while-drilling nuclear magnetic resonance is used to accurately measure the porosity and fluid saturation of the reservoir in real time and evaluate the physical properties of the reservoir, forming a geological sweet spot evaluation technology around the wellbore for shale oil. This technology has important guiding significance in the geological steering and perforation cluster optimization of horizontal wells in the Qingcheng Oilfield's shale oil, and has good promotion value in other unconventional oil and gas reservoirs.

关键词

页岩油 / 井周地质甜点 / 随钻成像测井 / 地质导向 / 射孔段簇优选

Key words

shale oil / geological sweet spots around the well / logging-while-drilling imaging / geosteering / perforation cluster optimization

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基金资助

国家油气重大专项(2025ZD1404802)