中国大中型气田有利勘探区带

EXPLORATION PLAYS IN LARGE AND MIDDLE GAS FIELDS IN CHINA

目前,中国(除台湾省外)共发现储量大于或等于1000亿m^3以上的大、中型气田33个,为全国气层气探明总储量的72％。本文着重探讨了中国大、中型气田的主要控制因素:即发育于生气中心及其周缘;成气区内古隆起(构造);潜伏低、中阶煤系或其上、下与之关联的圈闭;大、中型气田成藏期晚;大面积孔隙性储层和良好的区域性盖层。根据这些控制因素对塔里木、准噶尔、吐哈、柴达木、鄂尔多斯、四川、莺歌海、琼东南和东海盆地进行了综合评价,并指出了寻找大中、型气田的有利区带。

Up till now, China (Taiwan province not included) has discovered 33 large and middle gas fields (each of them has a reserve of ≥10×10~9m^3). The total proved reserves of these fields count 72% of the national proved reserves. This paper chiefly discusses the main controlling factors of large and middle gas fields in China, i. e., they are: developed in gas generating center and /Or its surrounding areas; occurred in paleo-uplifts within the gas generating area, and in buried low, middle Coal series or related traps above or beneath them; of late reservoir-forming period possessing largearea porous reservoirs and good regional cap rock. Based on these controlling factors, this paper gives comprehensive evaluations for Tarim, Junggar, Turpan-Hami, Qaidam, Ordos, Sichuan, Yinggehai, Qiongdongnan and Donghai basins. It also points out the exploration plays for discovering large and middle gas fields.