鄂尔多斯盆地长7页岩油层地质工程一体化评价

doi:10.3969/j.issn.1672-9803.2021.04.001

摘要/Abstract

摘要： 鄂尔多斯盆地长7页岩油层勘探历程回顾表明,制约页岩油直井勘探的主要问题:油产量整体较低;油产量与油层的厚度、基质渗流能力关系不密切;油产量整体与压裂规模呈正相关,但不完全取决于压裂规模;高油产量井勘探模式和成功经验难以推广,“甜点”难以确定;长7页岩油整体表现出“井井有油,井井不流”的特点。按照地质工程一体化理念,分析了流体微观和宏观运动规律以及体积压裂的适用条件,探讨了直井油产量主控因素,结果表明:对于天然裂缝不发育仅靠基质渗流的页岩油层,渗流力学决定了自然产能条件下直井难以达到工业意义的油产量;岩石力学决定了其不具有体积压裂条件,无法形成复杂的裂缝网络进而扩大泄油面积;天然裂缝或高渗砂体的发育程度是决定页岩油直井油产量的主要因素,也是页岩油“甜点”评价的重要指标。未来应按照地质工程一体化理念,转向高渗砂体形态的预测和刻画、天然裂缝的识别和预测、典型储层驱替压力(流速)-流体压力降的相关性、有效储层的多方法综合评价、“水平井+体积压裂”的裂缝有效性及分段贡献率评价等研究。

关键词: 岩石力学, 渗流力学, 油产量, 勘探历程, 页岩油层, 鄂尔多斯盆地

Abstract: A review of the exploration history of Chang 7 shale oil reservoirs in Ordos Basin shows that the main problems restricting shale oil vertical well exploration are: The overall oil production is low. Oil production is not closely related to reservoir thickness and matrix percolation ability. The overall oil production is positively correlated with the fracturing scale, but not entirely dependent on fracturing scale. The successes of high oil production wells are difficult to replicate, and the "sweet spot" is hard to determine. Chang 7 shale oil overall shows oil in each well, but under conventional conditions, the oil in the well does not flow. According to the idea of geology-engineering integration, the micro and macro movement laws of fluid and the applicable conditions of volume fracturing were analyzed, and the main controlling factors of vertical well oil production were discussed. The results show that for the shale oil reservoirs without natural fractures and only relying on matrix percolation, the dynamics of fluids in porous media determines that it is difficult for the vertical well to achieve industrial oil production under the condition of natural productivity. Rock mechanics determines that it does not have volume fracturing conditions, and fails to form complex fracture networks to expand drainage area. And the development degree of natural fractures or high permeability sand bodies is the main factor determining the oil production of shale oil vertical wells, and it is also an important index for shale oil "sweet spot" evaluation. Future researches should be in accordance with the idea of geology-engineering integration, and turn to prediction and characterization of high permeability sand body morphology, natural fracture identification and forecast, correlation between displacement pressure (fluid flow velocity) and fluid pressure drop of typical reservoirs, multi-method comprehensive evaluation of effective reservoirs, and evaluation of fracture effectiveness and section contribution rate of "volume fracturing with horizontal well", etc.

Key words: rock mechanics, the dynamics of fluids in porous media, oil yield, exploration history, shale oil reservoir, Ordos Basin

中图分类号:

TE132.1

齐亚林, 邵晓州, 庞锦莲, 程党性, 张晓磊, 孙勃. 鄂尔多斯盆地长7页岩油层地质工程一体化评价[J]. 录井工程, 2021, 32(4): 1-12.

QI Yalin, SHAO Xiaozhou, PANG Jinlian, CHENG Dangxing, ZHANG Xiaolei, SUN Bo. Geology-engineering integration evaluation of Chang 7 shale oil reservoirs in Ordos Basin[J]. Mud Logging Engineering, 2021, 32(4): 1-12.

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