陆相湖盆夹层型页岩油甜点分级测井评价方法研究——以鄂尔多斯盆地陕北吴起地区延长组长7 段为例

doi:10.3969/j.issn.1672-7703.2024.04.012

摘要/Abstract

摘要： 针对夹层型页岩油甜点测井评价难题，提出了从烃源岩品质参数、储层品质参数和二者的空间距离等多角度定量评价其耦合关系，实现了基于试油井资料刻度的夹层型页岩油产能分级和具有工业产能的“甜点”下限标准的确立，其可靠性得到多口井的验证。根据岩心地球化学实验分析数据建立基于测井资料定量计算烃源岩总有机碳含量的区域模型，并参考相关标准确定鄂尔多斯盆地陕北吴起地区延长组长7段有效烃源岩发育段。基于研究区砂岩储层的孔渗曲线计算储层品质因子，在此基础上确定待试油储层段与有效烃源岩的纵向最短距离，最终综合储层品质因子、平均TOC 及有效烃源岩厚度等，构建能够反映试油层段与邻近主力烃源岩段耦合关系的源储耦合系数计算公式，根据已知井测试结果标定，在一个油田或一个井区确定能够获得工业油流的甜点段源储耦合系数下限，据此可以对新井待试油层段进行评估，避免无效试油，从而为提高非常规油气试油成功率、优化产能建设提供决策依据。

关键词: 页岩油, 甜点, 产能分级, 测井解释, 产能预测

Abstract: In view of the difficulty in logging evaluation of the interlayered type shale oil sweet spots, a quantitative evaluation method has been proposed for the coupling relationship of source rock quality parameters, reservoir quality parameters, and their spatial distance, achieving the production capacity classification of the interlayered type shale oil and the determination of the lower limit standard for sweet spots with commercial oil flows after calibrated by well test data, which is reliable confirmed by multiple wells. Based on geochemical experimental data of core samples, a regional model for qualitative TOC calculation has been constructed by using logging data, and the effective source rock interval in the seventh member of Yanchang Formation in Wuqi area has been determined by referring to the relevant standards. The porosity-permeability relationship curve has been used to calculate the reservoir quality factor, and the vertical shortest distance between reservoir interval to be tested and effective source rock has been determined. Finally, a formula for calculating source rock and reservoir coupling coefficient that reflects the coupling relationship between the tested interval and the adjacent main source rock has been established by combining with reservoir quality factor, average TOC and effective source rock thickness. After calibrated by well test results, the lower limit of coupling coefficient in an oilfield or a well area with commercial oil flows has been determined, which enables to evaluate intervals to be tested in new wells and avoid ineffective well testing, improving success rate of unconventional oil and gas well test and providing decision basis for the optimization of capacity construction.

中图分类号:

TE122.1

李潮流, 王长胜, 张文静, 王敏, 李高仁, 徐红军. 陆相湖盆夹层型页岩油甜点分级测井评价方法研究——以鄂尔多斯盆地陕北吴起地区延长组长7 段为例[J]. 中国石油勘探, 2024, 29(4): 160-169.

Li Chaoliu, Wang Changsheng, Zhang Wenjing, Wang Min, Li Gaoren, Xu Hongjun. Logging evaluation method for sweet spots classification of the interlayered type shale oil in continental lake basin: a case study of the seventh member of Yanchang Formation in Wuqi area in Ordos Basin[J]. China Petroleum Exploration, 2024, 29(4): 160-169.

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