柴达木盆地天然气开发技术进展

青海气区是我国陆上的大气区之一，现已累计探明天然气地质储量3046.57×10⁸m³，可采储量1619.31×10⁸m³。该区的主力气田--涩北气田为第四系生物成因气田，具有特殊的地质条件，主要表现在气藏埋藏浅、储层岩性疏松、含气井段长、气层层数多、气水分布复杂、气田开发难度大。通过实施科技创新战略，积极探索和试验新工艺、新技术，气田开发水平得到了提高。为此，系统总结了2001年以来青海气区天然气开发技术的进展：低阻气层识别技术水平不断提高，天然气增储效果显著；疏松砂岩取心技术的突破，完成了大批岩心分析试验项目，推动了储层评价、气水关系等深入研究；开发层系及射孔单元的划分、井网部署、多层合采射孔层位优化、多层合采气井合理配产等方面的研究进展，使气藏工程研究及方案设计水平得到了提高。

INTRODUCTION OF TECHNOLOGY IMPROVEMENT ON NATURAL GAS DEVELOPMENT IN THE QAIDAM BASIN

Qinghai gas region, whose total identified natural gas reserve is 3046.57×108m3 with 1619.31×108m3 recoverable, is one of the primary gas regions inland China. Sebei gas field is the main gas field in this region, belonging to the quaternary formation. It has special geologic conditions: shallow gas reservoirs, unconsolidated reservoir rock, long gaseous well sections, multiple gas zones and complex gas water distribution, etc. Developing technologies of the gas field have so far been greatly improved through innovative implementation of scientific and technologic strategies, active research and testing on new techniques. In this paper, development of natural gas exploitation technologies in Qinghai gas region since 2001 has been systematically summarized. These technologies include identification of low resistivity gas zones which obviously increase the natural gas reserves, coring in unconsolidated sandstone which are helpful for core analysis, reservoir appraisal and gas water studies, and defying of development systems and perforation units, well patterns, optimization of perforation selection and production allocation in commingled wells, etc.