| 陈 鑫.临兴区块致密砂岩储层水赋存状态及气层含水程度识别方法[J].地质与勘探,2022,58(6):1131-1140 |
| 临兴区块致密砂岩储层水赋存状态及气层含水程度识别方法 |
| Water occurrence and identification method of the water-bearing degree of tight sandstone reservoirs in the Linxing block |
| 投稿时间：2021-06-01 修订日期：2211-10-25 |
| DOI：10.12134/j.dzykt.2022.06.017 |
| 中文关键词: 致密砂岩 产水来源 赋存状态 识别方法 气层含水程度 临兴区块 鄂尔多斯盆地东缘 |
| 英文关键词: tight sandstone, origin of production water, water occurrence, identification method, water-bearing degree, Lingxing block, eastern margin of Ordos Basin |
| 基金项目:中国海洋石油总公司项目（编号： CNOOC-KJ PT GCJS 2016-01）资助 |
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| 中文摘要: |
| 为明确鄂尔多斯盆地东缘临兴区块气水分布规律，提高储层气水分布预测精度，通过半渗透隔板实验、核磁共振实验和扫描电镜实验确定储层水赋存状态，基于现场生产资料和测井数据提供可动水饱和度和气层含水程度预测方法。结果表明，临兴区块储层水以束缚水、毛细管水和自由水3种状态赋存，束缚水饱和度为28.26%~58.14%，以束缚水为主的储层射孔后基本不产水；毛细管水是生产压差增加克服毛细管压力而被驱替出来的水，该类储层射孔后生产初期不产水，随着生产压差增大，产水量逐渐增大；致密砂岩储层束缚水饱和度主要受孔隙结构影响，研究区致密砂岩储层主要发育粒间孔、溶蚀孔和晶间孔，从粒间孔、溶蚀孔到晶间孔，小孔含量不断增加且孔隙结构越来越复杂，束缚水饱和度不断增加；利用物性指数表征孔隙类型和结构差异，则临兴区块储层束缚水饱和度随着物性指数增加而降低，随着泥质含量增加而上升，可采用物性指数和泥质含量回归得到束缚水饱和度预测公式，进而得到可动水饱和度；根据孔隙度、束缚水饱和度与可动水饱和度交汇图得到了同含水程度气层的识别方法，气层一般Φ>8%、Swf<15%、Swi<50%；差气层一般Φ<10%，Swf<15%，Swi< 45%；含气水层一般Φ>10%、Swf>5%、Swi为30%~55%；射孔层日产水量可以通过Qw=0.51Swi+2.16Swf+ 13.63Φ+0.17H-1.51计算。 |
| 英文摘要: |
| This work aims to define the gas-water distribution and thus to improve the prediction accuracy of the tight sandstone reservoirs in the Linxing block in eastern margin of the Ordos Basin. The water occurrence was studied by semipermeable partition experiments, nuclear magnetic resonance (NMR) experiments and scanning electron microscopy (SEM) experiments, and the mobile water saturation and water-bearing degree were predicted based on production data and logging data. Results show that the reservoirs in the Linxing block were dominated by bound water, capillary water and free water. The saturation of bound water ranged from 28.26% to 58.14%, and the reservoirs dominated by bound water hardly produced water after perforation. Capillary water was displaced by the increase of production pressure which can overcome the capillary pressure. The reservoir mainly with capillary water hardly produced water after perforation at the initial stage of production, while the water production increased with the increasing pressure difference. The saturation of bound water in the tight sandstone reservoirs was mainly affected by the pore structures. The tight sandstone reservoirs in the study area mainly develop intergranular pores, dissolution pores and intercrystalline pores. From intergranular pores and dissolution pores to intercrystalline pores, the proportion of micropore increases and the pore structure is becoming complex, resulting in the increase of bound water saturation. Physical property index was used to characterize the difference of pore sizes and structures, and the bound water saturation in the Linxing block decreases with the increase of physical property index and increases with the increase of argillaceous content. The prediction formula of bound water saturation can be obtained by regression of physical property index and argillaceous content, based on which the movable water saturation was determined. By the intersection plots of porosity, irreducible saturation of bound water and movable water, the water-bearing degree of the tight sandstone gas reservoirs was identified. The gas layer is generally characterized by Φ>8%, Swf<15% and Swi<50%; the poor gas layer is featured byΦ<10%, Swf<15% and Swi<45%; and the gas-containing water layer has Φ>10%, Swf>5% and Swi ranging between 30% and 55%. The daily water production of perforated layer can be effectively determined by the equation Qw=0.51Swi+2.16Swf+ 13.63Φ+0.17H-1.51. |
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