摘要
中国中西部前陆盆地(冲断带)以发育陆相烃源岩为特征。中西部周缘和弧后前陆盆地烃源岩形成于前陆盆地沉积期,包括准噶尔西北缘、准噶尔南缘、塔里木盆地西南缘、吐哈盆地二叠系烃源岩和川西、鄂尔多斯盆地西缘三叠系烃源岩;再生前陆盆地(冲断带)烃源岩主要形成于再生前陆盆地沉积之前的三叠—侏罗系和白垩系、古近系。根据沉积环境可以将烃源岩分为被动大陆边缘海相、残留海—(泻)湖相、湖沼相、内陆坳陷淡水湖相以及内陆坳陷断陷半咸水-咸水湖相烃源岩5种类型,其中湖沼相煤系烃源岩有机质类型为III型,以产气为主,其他烃源岩有机质类型主要为II型,其次为I型,以产油为特征。中国中西部前陆盆地石油潜在资源量为89.17×108t,天然气潜在资源量为101 464×108m3,与国外典型前陆盆地相比,中国前陆盆地具有富气特征。
The thrust belt-related foreland basins in central and western China are characterized by non-marine source rocks. The source rocks in peripheral and retro-arc foreland basins were formed in the period when the basins were developing, such as the Permian source rocks found in the northwestern and southern Junger basin, the southwestern Tarim basin, the Tuha basin and the Triassic source rocks found in the western Sichuan and western Ordos basins. The source rocks in reactivated foreland basins were formed in the Triassic-Jurassic, the Cretaceous, and the Paleogene, before the thrust-related foreland basins were formed. Based on their sedimentary environments, all of the source rocks in the foreland basins may be classified into five types： passive continental margin marine facies, relic marine-lacustrine facies, limnetic facies, intracontinental fresh-water lacustrine facies, and intracontinental semi-saline to saline lacustrine facies. The organic matter from the limnetic coal measure is of type Ⅲ and gas bearing. The organic matter from the other four types of source rocks is of typeⅠ and Ⅱand oil-bearing. Oil and gas resources in the foreland basins in the central and western China are ca. 89. 17 × 10^8 t and ca. 101 464×10^8 m^3 respectively, showing that gas is enriched in Chinese foreland basins compared with foreland basins elsewhere.
出处
《地学前缘》
EI
CAS
CSCD
北大核心
2005年第3期59-65,共7页
Earth Science Frontiers
基金
"十五"国家重点科技攻关项目(2004BA616A-04-04)
关键词
前陆盆地
烃源岩
油气资源
foreland basin
source rock
oil and gas resources
作者简介
柳少波（1967- ）,男,博士,高级工程师,石油地质专业,主要从事油气成藏研究.Tel：010-62098113;E-mail：lsb@petrochina.com.cn
