基于主控因素分析的致密砂岩产气与产水能力评价方法  

Evaluation method for gas and water production capacity of tight sandstone based on main control factor analysis

作　　者：王冬冬[1] 刘世伟[1] 侯振学[1] 肖凌毅 石磊 WANG Dongdong;LIU Shiwei;HOU Zhenxue;XIAO Lingyi;SHI Lei(Oilfield Technology Division of China Oilfield Services Co.,Ltd.,Korla 841000,China)

机构地区：[1]中海油田服务股份有限公司油田技术事业部,新疆库尔勒841000

出　　处：《复杂油气藏》2025年第1期16-23,共8页Complex Hydrocarbon Reservoirs

摘　　要：鄂尔多斯盆地神木地区致密气储量丰富,但致密砂岩储层地质和测井响应特征复杂,储层产气能力不明。为了明确致密砂岩储层的产气能力,以常规测井和阵列声波、核磁共振测井资料为基础,结合岩心实验资料和压裂测试资料进行分析,明确了导致致密气测井响应出现低孔、高孔与低阻、高阻交互组合等多样性特征的原因在于复杂的孔隙结构与黏土矿物等地质特征的影响,在此基础上探讨了物性、孔隙结构、含气丰度、脆性对储层产气性的影响,并提出了一种基于主控因素逐步分析的产气与产水评价方法。结果表明,致密砂岩储层产气控制因素不是单一因素或者多种控制因素的综合叠加,而是具有明确规律的不同物性情况下的“主控性”。在孔隙度大于9.6%的情况下,物性本身为致密砂岩产气的主控因素,结合电性可以判断储层是否出水;孔隙度小于9.6%情况下,物性不是主控因素,孔隙结构+含气丰度共同控制了产气能力与产水能力;在物性及孔隙结构+含气丰度均较差的情况下,脆性+物性控制了产气性。该评价方法和思路,在研究区经过测试验证效果良好,有效指导了致密砂岩气储层的勘探开发。The Shenmu area of the Ordos Basin has abundant tight gas reserves,but the geological and logging response characteristics of tight sandstone reservoirs are complex,and the gas production capacity of the reservoirs is unknown.In order to clarify the gas production capacity of tight sandstone reservoirs,based on conventional logging,array acoustic and nuclear magnetic resonance logging data,combined with the analysis of core experimental data and fracturing test data,it was clarified that the reason for the diversity characteristics of low porosity,high porosity-low resistance,and high resistance interactive combinations of the tight gas logging response is the influence of complex pore structure,clay minerals,and other geological characteristics.Based on this,the effect of physical properties,pore structure,gas abundance,and brittleness on reservoir gas production in reservoirs are studied,and a method for evaluating gas and water production based on stepwise analysis of main control factors is proposed.The results indicate that the control factors for gas production in tight sandstone reservoirs are not a single factor or a combination of multiple control factors,but rather the main controlling factors under different physical properties with clear patterns.When the porosity is greater than 9.6%,the physical property is the main controlling factor for gas production in tight sandstone,and combined with the electrical properties,it can be judged whether the reservoir is producing water or not;when the porosity is less than 9.6%,physical property is not the main controlling factor,pore structure and gas abundance jointly control the gas and water production capacity;in the case of poor physical properties,pore structure,and gas abundance,brittleness and physical properties control gas production.This evaluation method and idea have been tested and verified to be effective in the research area,effectively guiding the exploration and development of tight sandstone gas reservoirs.

关 键 词：致密砂岩 测井响应 产气性 产水能力 低阻气层 主控因素 

分 类 号：TE122[石油与天然气工程—油气勘探]