天然气工业2024，Vol.44Issue(3)：97-107,11.DOI:10.3787/j.issn.1000-0976.2024.03.008
基于拓扑分析的断层连通性定量评价及其油气地质意义
Quantitative evaluation of fault connectivity based on topological structural analysis and its petroleum geological implications:A case study of the Well H area in the southern Sichuan Basin
摘要
Abstract
Due to the influence of multi-stage structural superposition,a large number of medium to small scale faults are developed in deep shale gas reservoirs in the southern Sichuan Basin.Quantitative evaluation of fault network structures and plane connectivity is of great significance for deep shale gas exploration and development.In this paper,the medium to small scale faults in the deep shale gas reservoirs in the Well H area in the southern Sichuan Basin are delineated in detail using 3D data.On this basis,topological structural analysis and plane connectivity evaluation are conducted on faults in the shale reservoirs in this area.Then,through correlation analysis of available production data of shale gas wells,the controls of fault network topology and plane connectivity on shale gas enrichment are qualified.This study achieves new findings in three aspects.First,the fault nodes and branches show noticeable differential distribution in space,and agree well with the structures in strikes(NE-SW),as stripes.They are concentrated in the three narrow anticlines,but rare in the three synclines.Second,plane fault connectivity is greatly variable in different structural positions,with better connectivity in the anticlines than in the synclines.The northern portion of the western anticline,the eastern anticline and the central anticline present good,medium and poor fault connectivity,respectively.In the eastern anticline,the northern portion presents relatively higher connectivity than the southern portion.Third,there is a significant correlation between the production data of shale gas and the plane fault connectivity.With increasing fault connectivity,the production of shale gas climbs up and then falls down,indicating that neither high connectivity nor low connectivity of faults is beneficial to the enrichment of shale gas.This recognition is very valuable for evaluating the connectivity of medium to small scale faults and highly practical for exploration and development of deep shale gas.关键词
四川盆地南部/深层页岩气/断层/平面连通性/拓扑结构分析/定量评价/油气地质意义Key words
Southern Sichuan Basin/Deep shale gas/Fault/Plane connectivity/Topological structural analysis/Quantitative evaluation/Significance in petroleum geology分类
能源科技引用本文复制引用
裴仰文,赵静茹,郭伟,牟毅城,赵庆奇,苗正硕..基于拓扑分析的断层连通性定量评价及其油气地质意义[J].天然气工业,2024,44(3):97-107,11.基金项目
国家自然科学基金面上项目"含油气盆地深层亚地震断层变形机制及其储层改造作用:以莺琼盆地为例"(编号:42272147)、"碎屑岩储层断裂带构造成岩作用和油气封堵特征研究"(编号:41872143),山东省泰山学者青年专家项目(编号:tsqn202211081). （编号:42272147）
