川西气田中三叠统雷口坡组储层段灰岩薄夹层的识别及对钻井轨迹优化指导  

Identification of thin limestone interlayers in Leikoupo formation of middle Triassic in western Sichuan gas field and its guidance for drilling trajectory optimization

作　　者：贾鹏飞 苏成鹏 方思权 何莹[1,3] 晏国江 JIA Pengfei;SU Chengpeng;FANG Siquan;HE Ying;YAN Guojiang(Development Project Department of Pengzhou Gas Field(Marine facies),Southwest oil&gas Branch Company,SINOPEC,Pengzhou,Sichuan 611930,China;The First Natural Gas Production Plant,Southwest oil&gas Branch Company,SINOPEC,Chengdu,Sichuan,618099 China;Exploration and Development Research Institute of Southwest oil&gas Branch Company,SINOPEC,Chengdu,Sichuan 610041,China;Geological Logging Company of Southwest Petroleum Engineering Co.,Ltd.,SINOPEC,Mianyang,Sichuan 611330,China)

机构地区：[1]中国石化西南油气分公司彭州气田(海相)开发项目部,四川彭州611930 [2]中国石化西南油气分公司采气一厂,四川德阳618099 [3]中国石化西南油气分公司勘探开发研究院,四川成都610041 [4]中国石化西南石油工程有限公司地质录井分公司,四川绵阳611330

出　　处：《石油地质与工程》2021年第3期30-34,共5页Petroleum Geology and Engineering

基　　金：中国石化科技攻关项目群下属课题(P20059-3);中国石化重大科技攻关项目(P16092)。

摘　　要：川西气田鸭子河探区前期探井为直井且井数有限,一些灰岩薄夹层在测录井资料上未能真实反映,对钻井轨迹优化及下伏优质储层钻遇率有重要的影响。为了实现产能最大化,基于鸭子河构造带上资料相对丰富详实的2口大斜度井和1口直探井,研究川西气田主力产气层中三叠统雷口坡组四段三亚段3号层(T_(2)l_(4)^(3–3))灰岩薄夹层特征,并进行剖面对比分析。研究结果表明,T_(2)l_(4)^(3-3)层的中上部存在3~4套灰岩薄夹层,垂直厚度较薄且横向分布稳定,具有高电阻、低声波、低全烃、高钙低镁、差物性的特征。通过对灰岩薄夹层分布的系统解剖,其结果应用到后续施工井轨迹优化中,实现了快速穿过灰岩夹层,从而长穿优质储层,确保了优质储层的高钻遇率。The early exploration wells in Yazihe exploration area of western Sichuan gas field are vertical wells and the number of wells is limited.Some thin limestone interlayers cannot reflect the real logging data,which has an important impact on the optimization of drilling trajectory and the drilling encounter rate of underlying high-quality reservoirs.In order to achieve maximize productivity,based on 2 highly-deviated wells and 1 vertical exploratory well with relatively rich and detailed data in the Yazihe structural belt,the characteristics of thin limestone interlayer,the major gas pay zone in the western Sichuan gas field,in the third sub member of the Lei 4 member(T2l43-3)were studied.The results show that there are 3~4 sets of thin limestone interlayers in the middle and upper part of the high-quality reservoir of the third sub member of the Lei 4th member,with small thickness vertically and stable lateral distribution characterized by high resistance,low interval transit time,low total hydrocarbon and poor physical properties.Through the systematic analysis of the distribution of limestone thin interlayers,the results are applied to the follow-up construction well trajectory optimization,which can quickly pass through the limestone interlayers,so as to penetrate the high-quality reservoir and ensure the high drilling rate of the high-quality reservoirs.

关 键 词：川西气田 鸭子河构造 灰岩薄夹层 钻井轨迹优化 

分 类 号：TE242[石油与天然气工程—油气井工程]