摘要
四川盆地高石梯-磨溪地区震旦系灯影组碳酸盐岩储层溶蚀缝洞发育、非均质性强、测试产量变化大、控制因素复杂,常规测井在碳酸盐岩复杂溶蚀缝洞定量分析及有效性评价上具有很大的局限性。为了更好地进行储层评价,采用微电阻率成像测井缝洞有效性分析新技术对溶蚀缝洞进行有效性半定量-定量评价,可计算得到面孔率、孔洞面积及连通性指数等关键参数。该技术的优势在于可基于岩心刻度,通过人机互动的方式来约束门槛值的选取,从而去除电成像图像上泥质、黄铁矿、诱导缝及井壁崩落等信息的影响,只提取有效缝洞的信息。通过现场应用得出,缝洞有效性分析新技术能够较为准确地评价井筒附近溶蚀缝洞的有效性,高石梯-磨溪地区优质储层缝洞有效性分析结果与岩心特征吻合度较高。此外,还尝试将有效性参数与单井无阻流量作为输入,利用神经网络学习,进行无阻流量与缝洞有效性参数及储层厚度关系的探讨分析,形成了初步预测无阻流量级别的方法。
The secondary pores occurred in post-sediment deposition are very heterogeneous in the Sinian Dengying carbonate formation of Gaoshiti-Moxi area in Sichuan basin,which has caused significant test production differences.Conventional logging and seismic data have lots of limitation in Dengying carbonate reservoir effectiveness analysis,but the advanced technology about secondary pore-fracture effectivity analysis can solve this problem.Surface porosity,size and connectedness parameter curves of effective pore-fracture can be calculated through the advanced technology.The key point of this advanced technology is that fake information like muddy,pyrite,induced fracture and breakout can be distinguished and removed,and only remains unfilled effective pores by selecting an appropriate threshold value based on core calibration.The result shows the new technology for analyzing the effectiveness of fractures and vugs can accurately evaluate the effectiveness of fractures and vugs near the wellbore,and the effectiveness analysis results of fractures and vugs are highly consistent with the core in Gaoshiti-Moxi area.In addition,an attempt is made to use the effectiveness parameters and open flow rate as inputs,and IPSOM is used to explore and analyze the relationship between open flow rate level,reservoir effective parameters,and reservoir thickness,forming a preliminary method for predicting open flow rate levels.
作者
莫静
谢冰
赖强
王大力
王玥
MO Jing;XIE Bing;LAI Qiang;WANG Dali;WANG Yue(SLB,Chengdu,Sichuan 610500,China;Research Institute,PetroChina Southwest Oil&Gasfield Company,Chengdu,Sichuan 610500,China)
出处
《测井技术》
CAS
2023年第3期344-349,共6页
Well Logging Technology
关键词
电成像测井
储层缝洞有效性分析
震旦系灯影组
高石梯-磨溪地区
electrical image logging
reservoir fracture-vug effectivity analysis
Sinian Dengying formation
Gaoshiti-Moxi area
