关键词: 储层分析, 裂缝, 数值模拟, 长兴组, 四川盆地

Abstract: ReefreservoiristhemainreservoirtypeofChangxingFormationinHuanglongStructure， butthedynamic
data analysis suggests that different production wells vary dramatically in productivity. Research shows that the
productionofsinglewellismainlyaffectedbyfractures. Therefore， predictionsonfracturesofChangxingFormation
in Huanglong Structure can better guide well pattern and development. By analyzing the tectonic origin and power
source of the study area， this paper builds up the structure formation models of the study area. By combining
petroleum geology， structural geology， rock mechanics and a variety of production materials and by applying two-
dimensional numerical simulation of paleo-tectonic stress field， the cracking degree of the rock mass is predicted.
Then the failure approach index is calculated and the relation between fracture development and the cracking degree
oftherockmassisdefined， whichhelpstodeterminethedevelopmentlevelsoffracturesandmakesacomprehensive
prediction of fracture development， fracture types and attitude. Vector direction of principal stress in early and late
stages in Huanglong Chang classifies the fracture development into 2 stages， 4 grades and 6 categories.

Key words: Structure analysis, fracture, numerical simulation, Changxing Formation, Sichuan Basin