云南晚第三纪地层分区及其含油气性

云南上第三系为山间盆地沉积。依据盆地的大地构造位置、地理位置、地层发育情况、基岩性质、沉积物及古生物特征，可划分为滇东、滇西２个地层区和１１个地层分区：昭通—会泽、宣威—曲靖、文山—广南、玉溪—建水、楚雄—元谋、丽江—洱源、兰坪—永平、思茅—江城、临沧—澜沧、保山—镇康、腾冲—潞西。分析各区的地层层序、区域地质特征及含油气性，认为滇东区的曲靖—宣威、丽江—洱源，滇西区的思茅—江城、保山—镇康等地层分区的一些盆地，烃源岩厚度、有机质丰度等指标和生储盖组合条件相对较好，有可能形成油气聚集带，为较有利的油气勘探领域。图１参６（梁大新摘）

Stratigraphic division and oil gas potential of the Late Tertiary in Yunnan province.

The Upper Tertiary in Yunnan province is the deposit of intermountain basin with complicated and varied lithology, lithofacies and palaeobiocoenosis. According to the basin's geotectonic location, geographical location, stratigraphy, the basement nature, sedimentary facies, palaeontologic characteristics etc., the Upper Tertiary can be divided into 2 stratigraphic areas (Diandong and Dianxi) and 11 subareas (Zhaotong Huize, Xuanwei Qujing, Wenshan Guangnan, Yuxi Jiangshui, Chuxiong Yuanmou, Lijiang Eryuan, Lanping Yongping, Simao Jiangcheng, Lincang Lancang, Baoshan Zhenkang, Tengchong Luxi). Analyzing the regional geologic characteristics, subarea stratigraphic sequence, subarea regional strata characteristics and the oil gas potential of each subarea, this paper indicates that conditions of some subarea basins, such as Qujing Xuanwei, Lijiang Eryuan in Diandong area and Simao Jiangcheng, Baoshan Zhenquan in Dianxi area, are good in thickness of hydrocarbon source rock, abundance of organic matter and source reservoir seal assemblage relatively. These basins are profitable ranges of oil gas exploration for their possibility of forming oil gas accumulation zone.