石油地质与工程2025，Vol.39Issue(4)：33-40,8.
川西地区须家河组裂缝发育特征及精细刻画
Fracture development characteristics and fine description of the Xujiahe Formation in Western Sichuan:A case study of Xinchang Gas Field
摘要
Abstract
In the deep Sichuan Basin,tight sandstone gas reservoirs in the Xujiahe Formation feature sub-stantial reserve volumes.However,the current recovery rates remain low,demonstrating good potential for production expansion.Investigating the enrichment patterns of"fault-fold fracture bodies"has emerged as a breakthrough for achieving large-scale,efficient development and boosting reserves and production of deep tight sandstone gas.This study leverages the multi-attribute fusion technology of entropy,maximum likelihood,and curvature,grounded in artificial fault interpretation results,to conduct a fine description of"fault-fold fracture bodies."Key findings include:1)Fractures in the study area exhibit diverse genetic types and complex occurrences,with spatial distributions mainly controlled by faults and structural highs,thereby forming three"sweet spot"models:fault-fracture bodies,fold-fracture bodies,and fault-fold fracture bodies.2)Integrating entropy and maximum likelihood attributes enables precise delineation of fault-fracture body contours;positive curvature attributes effectively reveal fold-fracture body outlines;and fusing seismic attributes of both types outperforms conventional techniques in characterizing fault-fold fracture bodies.3)Fault-fold fracture bodies primarily occur in the structural core of the Xinchang Gas Field,with the LJ and GMZ areas identified as prime development zones.Actual drilling results demonstrate a 100％success rate in encountering fault-fold fracture bodies in new wells.The coincidence rate of effec-tive fracture prediction for each sand group has significantly increased from 45.9％to 86.4％,confirming favorable gas well testing and production outcomes.Overall,the study proves that fracture development in the Xujiahe Formation of Western Sichuan is governed by faults and structural highs.The established"fault-fold fracture body"geological model,coupled with multi-attribute fusion technology,offers a reliable approach to mapping their spatial distribution,thus providing a technical support for efficient explo-ration and development of deep tight sandstone gas resources.关键词
川西地区/须家河组/裂缝特征/控制因素/精细刻画Key words
western Sichuan/Xujiahe Formation/fracture characteristics/main controlling factors/fusion attributes/fine description分类
天文与地球科学引用本文复制引用
杨成,毕有益,冯英,严焕榕,邓美洲,王荐,苏娜,苏燕..川西地区须家河组裂缝发育特征及精细刻画[J].石油地质与工程,2025,39(4):33-40,8.基金项目
中国石化油田勘探开发事业部先导项目"川西须二气藏Ⅱ+Ⅲ类区开发评价及部署研究"(YTBXD-QTKF-2024-1-01-001). （YTBXD-QTKF-2024-1-01-001）
