基于图像识别技术的裂缝发育程度定量评价新方法——以安岳气田须二气藏为例  

A new method for quantitative evaluation of fracture development degree based on image recognition technology:Take the Xu2 gas reservoir in the Anyue gas field as an example

作　　者：彭越 张满郎[2] 李明秋 万玉金[2] 李昱宏 张静平[2] 滕柏路 牛梦瑶 罗万静[1] PENG Yue;ZHANG Manlang;LI Mingqiu;WAN Yujin;LI Yuhong;ZHANG Jingping;TENG Bailu;NIU Mengyao;LUO Wanjing(School of Energy Resources,China University of Geosciences(Beijing),Beijing 100083,China;PetroChina ResearchInstitute of Petroleum Exploration&Development,Beijing 100083,China;Research Institute of Exploration&Development,PetroChina Southwest Oil&Gas Field Company,Chengdu 610041,China)

机构地区：[1]中国地质大学(北京)能源学院,北京100083 [2]中国石油勘探开发研究院,北京100083 [3]中国石油西南油气田分公司勘探开发研究院,成都610041

出　　处：《非常规油气》2024年第1期12-21,共10页Unconventional Oil & Gas

基　　金：中国石油集团重大科技专项“致密气井型优化与提高EUR技术研究”(2021DJ2105)。

摘　　要：储层天然裂缝的预测及评价对裂缝性气藏开发至关重要。岩心观察、地球物理方法和裂缝建模是目前对裂缝定性和定量描述的主要方法。以安岳气田须二气藏为例,以裂缝建模三维数据体为基础,引入图像自动识别技术,定义无量纲裂缝发育指数,对单井储量控制体内的裂缝发育程度进行定量评价,形成了一套新的裂缝发育程度评价方法。研究结果表明:1)图像识别技术利用计算机读取每个像素的RGB基础色强度数值,通过RGB数值的大小来判断图像所代表的实际物理参数分布规律,能实现对裂缝发育程度的快速定量评价;2)安岳气田须二气藏平均单井储量控制体积内无量纲裂缝发育指数为0.38,整体裂缝发育;3)裂缝发育指数可作为气井早期生产预测的重要指标,裂缝发育指数大的气井初期产量和无阻流量较大,井位部署可优先考虑裂缝发育指数大于0.40的区域。该研究对国内外类似储层裂缝的定量评价及安岳气田须二气藏后续开发有指导意义。The prediction and evaluation of natural fractures play a significant role in developing fractured gas reservoirs.Three manners are widely used to characterize natural fractures qualitatively and quantitatively,including core observation,geophysical method,and fracture modeling.Based on the 3D fracture model,the fracture development degree of the controllable reserves volume per well in Anyue gas field was evaluated using image automatic recognition technology and the dimensionless fracture development index.In addition,a new method was established.The study on Xu2 gas reservoir in Anyue gas field showed that:1)The image recognition technology uses the computer to read the RGB basic color intensity value of each pixel to judge the distribution rule of the actual physical parameters represented by the image through the size of the RGB value,and the fracture development degree can be evaluated quickly and quantitatively.2)The average dimensionless fracture development index is 0.38,which indicates fractures are developed in the controllable reserves volume per well of Xu2 gas reservoir in Anyue gas field,and the fracture development index can be used as an essential index for early production prediction of gas wells.3)Fracture development index can be used as an important index for early production prediction of gas wells,the initial production and open-flow rate of gas wells with high fracture growth index are large,and the region with fracture growth index greater than 0.40 can be preferentially considered for well location deployment.This study has guiding significance for the quantitative evaluation of similar reservoir fractures in China and abroad and the subsequent development of Xu2 gas reservoir in Anyue gas field.

关 键 词：图像识别 裂缝发育程度 安岳气田 气井产能 

分 类 号：TE332[石油与天然气工程—油气田开发工程]