摘要
经过10余年的探索和实践,四川盆地南部地区3 500 m以浅的页岩气资源已进入了规模开发阶段,该区上奥陶统五峰组—下志留统龙马溪组页岩气藏目的层小层明确,但如何依靠录井配套技术实现水平井批量优快钻井是当前需要研究的重点问题之一。为此,从分析该盆地五峰组—龙马溪组页岩气储层特征入手,结合100余口页岩气井的录井成果,开展页岩气储层识别、小层划分与评价方法等方面的研究,优选适用于页岩气评价的录井采集参数,形成了页岩气储层识别与评价的录井配套技术系列。研究结果表明:①利用元素录井+自然伽马能谱录井,可有效划分页岩气目的层小层,结合随钻伽马可有效辅助地质导向,确保页岩气水平井入靶成功率及水平段井眼轨迹的适时调整;②综合利用元素录井+自然伽马能谱录井+核磁共振录井+气体录井,结合页岩气储层评价标准,可实现对页岩气储层的划分和定量评价,为水平井导向提供支撑;③现场应用效果证实,所形成的录井配套技术拓展了录井技术的应用领域,能够快速识别、评价页岩气储层,有效指导了该区的钻井作业、提高了页岩气优质储层的钻遇率。
After more than ten years of exploration and practices,the shale gas resources above the burial depth of 3 500 m in the southern Sichuan Basin has stepped into the stage of scale development.The sublayers of target layers in the shale gas reservoirs of Upper Ordovician Wufeng Formation–Lower Silurian Longmaxi Formation are defined,but how to realize batch optimal and fast drilling of horizontal well by means of mud-logging support technologies is currently one of the key issues to be investigated.To this end,the characteristics of shale gas reservoir of the Wufeng Formation–Longmaxi Formation in the Sichuan Basin were firstly analyzed in this paper.Then,combined with the mud-logging results of over 100 shale gas wells,a series of researches were carried out from the aspects of shale gas reservoir identification,sublayer division and evaluation method,and the mud-logging acquisition parameters suitable for shale gas evaluation were selected.In this way,the mud-logging support technologies for the identification and evaluation of shale gas reservoirs are developed.And the following research results were obtained.First,the combination of element logging and gamma-ray energy spectrum logging can subdivide the target shale gas layers effectively,and combined with the gamma ray while drilling,it can assist the geosteering effectively,so as to ensure the targeting success ratio of shale gas horizontal wells and the timely adjustment of horizontal section trajectories.Second,the comprehensive application of element logging,gamma-ray energy spectrum logging,nuclear magnetic resonance logging and gas logging,combined with the shale gas reservoir evaluation criterion,can realize the division and quantitative evaluation of shale gas reservoirs and provide the support for the geosteering of horizontal wells.Third,the field application effect verifies that the mud-logging support technologies developed in this paper expand the application scope of mud logging technologies.By virtue of these mud-logging support technologies,shale gas reservoirs can be identified and evaluated quickly,the drilling operation in this area is under effective guidance,and the drilling rate of shale gas reservoirs is improved.
作者
郑马嘉
唐洪明
瞿子易
刘雪梅
贾昭清
肖平
罗鑫
庞江平
王柯
Zheng Majia;Tang Hongming;Qu Ziyi;Liu Xuemei;Jia Zhaoqing;Xiao Ping;Luo Xin;Pang Jiangping;Wang Ke(School of Geosciences and Technology,Southwest Petroleum University,Chengdu,Sichuan 610500,China;Shale Gas Exploration Department,PetroChina Southwest Oil&Gasfield Company,Chengdu,Sichuan 610051,China;Geological Exploration and Development Research Institute,CNPC Chuanqing Drilling Engineering Co.,Ltd.,Chengdu,Sichuan 610051,China;Sichuan Shale Gas Exploration and Development Co.,Ltd.,Neijiang,Sichuan 641100,China;Development Department,PetroChina Southwest Oil&Gasfield Company,Chengdu,Sichuan 610051,China;Sichuan Changning Natural Gas Development Co.,Ltd.,Yibin,Sichuan 644300,China)
出处
《天然气工业》
EI
CAS
CSCD
北大核心
2019年第8期41-49,共9页
Natural Gas Industry
基金
国家自然科学基金面上项目“页岩气储层纳米尺度非均质性研究”（编号：51674211）
关键词
页岩气
录井技术
地层划分
储集层评价
水平井地质导向
随钻解释评价
四川盆地南部地区
晚奥陶世—早志留世
Shale Gas
Mud logging technology
Stratigraphic division
Reservoir evaluation
Geosteering of horizontal wells
Interpretation and evaluation while drilling
Southern Sichuan Basin
Late Ordovician–Early Silurian
