摘要
安场地区页岩气田位于贵州省北部,产气层为五峰组—龙马溪组页岩,该气田具有源储一体、分布稳定和自生自储的特征,属于正常压力型的浅层山地页岩气田。由上至下,主要含气层的硅质矿物含量逐渐升高,黏土矿物含量逐渐降低;页岩储集空间以纳米级有机质孔为主,其次为残余粒间孔、晶间孔、次生溶孔、黏土矿物片间孔等。气井生产具有见气返排率较低、产量递减较缓慢和稳产时间长的特征。针对该类型气藏地质与开发特征,应加强精细地质建模和压裂方案优化,适度扩大井距;针对断裂发育和非均质性强的特征,需要加强地质工程一体化设计,通过不断迭代优化,建立精确的页岩气藏模型;针对水平应力差异系数较大及复杂缝网形成难的特征,应优化压裂段长度和簇间距,实施密切割和裂缝转向技术;针对气藏压力低、井口压力下降快和产气量低的特征,应进一步优化试气阶段的返排管理制度。
The shale gas field in Anchang area in the northern part of Guizhou province is primarily producing from the shales in the Wufeng formation to Longmaxi formation.This gas field is characterized by a source-reservoir integrated system in stable distribution and self-generation and self-storage pattern,and it is classified as a shallow mountainous shale gas field under normal pressure.From top to bottom,the gas-bearing layers show an increasing content of siliceous minerals and a decreasing content of clay minerals.The shale reservoir space primarily consists of nanometer-scale organic pores,followed by residual intergranular pores,intercrystalline pores,secondary dissolution pores,and clay mineral interlamellar pores.The gas wells generally exhibit low flowback rates upon gas breakthrough,slow production decline,and long stable production period.Considering the geological and developmental characteristics of this type of gas reservoir,it is important to enhance detailed geological modeling and fracturing design optimization,as well as to moderately expand well spacing.Given the presence of faults and strong heterogeneity,integrated geological and engineering design should be strengthened,and the 3D reservoir geological model should be iteratively optimized to establish an accurate shale gas reservoir model.In view of the large differential horizontal stress ratios and the difficulty in forming complex fracture networks,fracturing stage length and cluster spacing should be optimized,and multi-cluster fracturing and fracture diversion techniques can be implemented.For low reservoir pressure,fast decline in wellhead pressure,and low gas production,the flowback management system in the gas testing stage should be further optimized.
作者
刘洪林
鲁眈
梁峰
何新兵
李刚权
赵群
拜文华
LIU Honglin;LU Dan;LIANG Feng;HE Xinbing;LI Gangquan;ZHAO Qun;BAI Wenhua(Research Institute of Petroleum Exploration and Development,PetroChina,Beijing 100083,China;Guizhou Shale Gas Exploration and Development Co.,Ltd.,Zunyi,Guizhou 563499,China)
出处
《新疆石油地质》
北大核心
2025年第1期78-87,共10页
Xinjiang Petroleum Geology
基金
中国石油前瞻性基础性技术攻关项目(2024DJ87)。
关键词
贵州
安场地区
页岩气
龙马溪组
页岩
常压气田
孔隙结构
Guizhou province
Anchang area
shale gas
Longmaxi formation
shale
normal-pressure gas field
pore structure
作者简介
第一作者:刘洪林(1973-),男,江苏丰县人,高级工程师,博士,非常规油气地质评价,(Tel)13831684241,(Email)liuhonglin69@petrochina.com.cn。
