21世纪初叶四川盆地天然气发展前景

PROSPECTS FOR DEVELOPING NATURAL GAS IN SICHUAN BASIN IN THE EARLY PART OF THE 21ST CENTURY

随着 2 1世纪的到来 ,国家大力发展天然气工业 ,四川盆地将面临勘探领域和接替层系的选择。笔者通过分析勘探成果与待发现资源潜力、成藏地质条件与储备圈闭 ,结合“八五”、“九五”科技攻关成果 ,提出了具备大中型气田条件的七个主要地区和层系 ,川东石炭系、下三叠统飞仙关组 ;川西北侏罗系、中上三叠统 ;川中中、上三叠统 ;川西南震旦系 ;川南、川西南下二叠统。指出了 2 1世纪初叶具有发展远景的五大勘探领域 :①盆地东部石炭系 ;②盆地东北部下三叠统飞仙关鲕粒滩岩 ;③盆地东北部上二叠统长兴组陆棚边缘礁相带 ;④盆地中西部上三叠统和侏罗系浅气层 ;⑤盆地震旦系及下古生界。认为 2 1世纪初叶四川盆地天然气资源潜力大、勘探领域广阔、勘探前景看好。

Along with the coming of the 21st century,the natural gas industry has been greatly developed in our country and the choices of exploration realms and succeeding strata will be faced in Sichuan Basin.Through analyzing exploration results,undiscovered resource potential,reservoir formation geological conditions and stored traps,the strata,being of the geological conditions of forming large-and medium-sized gas fields,in seven regions are proposed in combination with the results of the national scientific and technological key research projects of the “Eighth Five-Year Plan” and “Ninth Five-Year Plan”.They are:the Carboniferous,the Feixianguan Formation of the Lower Triassic in East Sichuan;the Jurassic,Middle-Upper Triassic in Northwest Sichuan;the Middle-Upper Triassic in Central Sichuan;the Sinian in Southwest Sichuan;and the Permian in South Sichuan and Southwest Sichuan.Five exploration realms being of broad prospects for hydracarbons in the early part of 21st century are also proposed in the paper.They are:①the Carboniferous in the east part of the basin,②the oolitic beach rocks of the Feixianguan Formation of the Lower Triassic in the northeast part of the basin,③the continental shelf marginal reef facies zones of the Changxing Formation of the Upper Permian in the northeast part of the basin,④the shallow gas layers of the Upper Triassic and Jurassic in the central-west part of the basin,and ⑤ the Sinian and Lower Paleozoic in the basin.Finally,it is concluded that the natural gas resource extent is large,its exploration realms are wide and its exploration prospects are good in Sichuan Basin in the early part of 21st century.