【摘要】 为评价古龙页岩油弹性开发后储层吸气能力，验证CO₂吞吐增能效果及吞吐对邻井生产动态的影响，在古龙页岩油核心区构建“地下实验室”，以GY40井青山口组二段Q₈―Q₉油层为靶层开展矿场试注试验。采用阶梯升速方式累计注入CO₂量为1.1×10⁴ t，闷井30 d后开井返排，系统监测GY40井及邻井生产响应。结果表明：GY40井阶段累计产油量由措施前的36 t增至462 t，增幅达12倍；邻井Q₉-H5井在注气约75 d后产油量上升、含水率下降，返排气中CO₂体积分数由1.1%升至8.1%，显示直井-水平井间已建立有效驱替通道；吸气与产液剖面显示该井段吸气及产出均匀，证实直井具备作为注采井组核心实施立体开发的潜力；试验发现注气过程中G72井出现井口结冰、CO₂体积分数达80%的气窜显示，推测与断层活化或井筒完整性有关；直井CO₂吞吐可有效提升古龙页岩油单井产油量，直-平井网具备构建有效驱替的地质基础，但规模化应用中需重视气窜风险防控。研究成果为古龙页岩油CO₂驱技术推广提供了关键矿场依据，对推动陆相页岩油效益开发具有重要指导意义。更多还原

【Abstract】 In order to evaluate CO₂ absorption capacity of Gulong shale oil reservoir after elastic development and verify energy replenishment effect and the impact of CO₂ huff and puff on production performance of adjacent wells, an “underground laboratory” is established in the core area of Gulong shale oil. A field trial injection test is conducted by taking Q₈-Q₉ reservoirs in the second member of Qingshankou Formation in Well GY40 as target reservoirs. A total of 1.1×10⁴ t of CO₂ is injected using a stepwise rate-increasing method, followed by a 30-day soaking period before flowback, systematically monitoring production response of Well GY40 and adjacent wells. The results show that, the cumulative oil production of Well GY40 increases from 36 t to 462 t after treatment, representing a 12-times increase. In adjacent well Q₉-H5, oil production increases and water cut decreases approximately 75 days after gas injection, with CO₂ volume fraction in produced gas increasing from 1.1% to 8.1%, indicating the establishment of an effective displacement channel between vertical wells and horizontal wells. CO₂ absorption and liquid production profiles reveal that the absorption and production in the well interval are uniform, confirming the potential of vertical wells as the core of injection-production well patterns for three-dimensional development. During gas injection process, Well G72 exhibits wellhead freezing and gas channeling with a CO₂ volume fraction of 80%, possibly relating to fault activation or wellbore integrity. CO₂ huff and puff in vertical wells effectively enhances singlewell oil production of Gulong shale oil, and the vertical-horizontal well pattern provides a geological basis for effective displacement. However, attention should be paid to gas channeling risk prevention and control in large-scale application. The research provides key field reference for popularizing CO₂ flooding technology in Gulong shale oil, being of significant guidance for promoting the economic development of continental shale oil.更多还原