鄂尔多斯盆地致密气勘探开发形势与未来发展展望

鄂尔多斯盆地致密气主要分布在上古生界石炭—二叠系,致密气资源量10.37×1012m3,占盆地天然气总资源量的68%,1995年以来先后发现了米脂、乌审旗、大牛地、神木、苏里格5个致密大气田,致密气地质储量3.78×1012m3,目前已进入储量产量快速增长阶段,近5年来储量年均增幅超过5 000×108m3,致密气产量年均增幅30×108m3,建成了以苏里格气田为代表的致密气生产基地,集成创新形成了以全数字地震、优化钻井、储层改造、井下节流、排水采气、数字管理等为核心的致密气勘探开发关键技术,转变发展方式形成了以"标准化设计、模块化建设、数字化管理、市场化运作"为重点的致密气田开发模式,2011年苏里格气田生产致密气137×108m3,成功地向北京、上海、西安、银川、呼和浩特等重点城市供气。综合评价认为:苏里格南部、靖边—高桥、神木—米脂、盆地西南部是近期致密气增储上产的主要地区,预计2015年以前,盆地致密气储量规模将超过4.5×1012m3,致密气产量将达到255×108m3,并持续长时间稳产。

Status and prospects of tight gas exploration and development in the Ordos Basin

Tight gas of the Ordos Basin is mainly distributed in the Upper Paleozoic Permo-Carboniferous source rocks,tight gas resources reaching 10.37 × 1012 m3,among which natural gas resources occupy 68 %.Since 1995,five large gas fields have been developed and proved in Ordos Basin,Mizhi,Wushenqi,Daniudi,Shenmu and Sulige,in which accumulation reserves of tight gas reached 3.78 × 1012 m3.At present,the field has now entered a stage of rapid growth of reserves production.The average annual increase of reserves is more than 5 000 × 108 m3 in the past five years,and the average annual increase of tight gas production is 30 × 108 m3.A tight gas production base was established,taking Sulige gas field as the representation.Key technologies of tight gas exploration and development were integrated innovated around full digital seismic,optimization of drilling,reservoir reconstruction,downhole choke,draining gas exploitation technology and digital management.The mode of development was changed to form a mode of dense gas field development by focusing on"standardized design,modular construction,digital management,market-oriented operation".In 2011,the production of Sulige gas field reached 137 × 10 8 m3,which has made a contribution to improving the gas supply conditions for key cities such as Beijing,Shanghai,Xi’an,Yinchuan etc.Multiple-discipline comprehensive research shows that the south part of Sulige gas field,Jingbian-Gaoqiao and Shenmu-Mizhi areas are the impartant fields for future exploration of tight gas and increasing reserves and productions.By 2015 as expectation,the accumulated reserves would increase up to totally over 4.5 × 1012 m3 of tight gas and 255 × 108 m3 of tight gas would be produced in Sulige area.