鄂尔多斯盆缘PY地区长8段流体饱和度特征及校正研究  

Fluid saturation characteristics and correction for Chang 8 reservoir of Yanchang Formation in the PY area,the southwestern margin of Ordos Basin

作　　者：梁正中 许红涛 常利娜 LIANG Zhengzhong;XU Hongtao;CHANG Lina(College of Chemistry Engineering,Yulin University,Yulin 719000,China;School of Petroleum Engineering,Xi’an Shiyou University,Xi’an 710065,China)

机构地区：[1]榆林学院化学与化工学院,陕西榆林719000 [2]西安石油大学石油工程学院,陕西西安710065

出　　处：《复杂油气藏》2023年第2期179-184,共6页Complex Hydrocarbon Reservoirs

基　　金：陕西省科学技术厅重点研发计划(2020SF-369);榆林市科技局项目(CXY-2022-73)。

摘　　要：致密砂岩油藏是当前非常规油气勘探中的最现实领域之一。鄂尔多斯盆地西南缘PY地区长8段主力油层非均质强、含油性差异大,相关流体饱和度参数测试分析与对比校正极为重要。通过地面测量的含油饱和度一般小于30%,常存在流体饱和度损失而和地下储层真实值之间存在较大差距,为此本文采用数理统计方法建立了该区流体饱和度校正模型。结果表明,校正之后的长8含油饱和度参数提高15%以上,更加吻合测录井显示及试油对比结果。但PY地区整体含油饱和度仍显著低于湖盆内部,其原因在于供烃成藏条件相对不利造成本区欠充注型油藏发育。由于储层物性相对较好导致可动油饱和度略高,从而出现含油显示虽差而出油尚可的情况,提出应在流体饱和度校正基础上进一步开展可动油评价。The tight sandstone reservoirs are one of the most realistic areas in current unconventional oil and gas exploration.In the PY area of the southwest margin of the Ordos Basin,the main oil reservoir in the Chang 8 section has strong reservoir heterogeneity and large oil-bearing differences,so the relevant fluid saturation parameters are extremely important for test analysis and comparative calibration.The oil saturation of the PY reservoir measured in the laboratory is generally less than 30%,and there is often a large difference between the fluid saturation loss and the real value of the subsurface reservoir.Therefore,a correction model of fluid saturation in this region was established by using mathematical and statistical methods.The results show that the corrected oil saturation of the Chang 8 reservoir is improved by more than 15%,which is more consistent with the results of logging data and oil testing comparison.However,the overall oil saturation in the PY area is still significantly lower than that in the interior of the lake basin,which is due to the relatively unfavorable hydrocarbon supplying reservoir formation conditions causing the development of underfilled reservoirs in this area.Due to the relatively better reservoir physical properties,the mobile oil saturation is slightly higher,resulting in a situation where the oil-bearing indication is poor but oil production is still feasible,and it is proposed that further mobile oil evaluation should be carried out based on fluid saturation correction.

关 键 词：流体饱和度 校正模型 欠充注 长8段 鄂尔多斯盆地 

分 类 号：TE122[石油与天然气工程—油气勘探]