滇黔桂地区新生代盆地生物气成藏分区性

POOL-FORMING ZONALITY OF BIOGASES IN THE CENOZOIC BASINS OF DIAN-QIAN-GUI AREA

陆黄生 周荔青

LU Huang-sheng ZHOU Li-qing

南京大学, 地球科学系, 江苏, 南京, 210093 2. 中国石化, 华东分公司, 江苏, 南京, 210011 3. 西北大学, 地质学系, 陕西, 西安, 710069

Department of Earth Sciences, Nanjing University, Nanjing, Jiangsu 210093, China 2. East China Branch, SINOPEC, Nanjing, Jiangsu 210011, China 3. Department of Geology, Northwest University, Xi'an, Shaanxi 710069, China

在印度板块与欧亚板块的"陆陆"碰撞拼贴构造作用下,滇黔桂地区在喜山Ⅰ、Ⅱ、Ⅲ幕,分别于桂、滇西和滇东—黔南地区,顺大型走滑断裂带形成了一大批始新世—渐新世、中新世和上新世第三期的小型山间走滑拉分盆地.3个地区发育的3期盆地具有不同的构造和沉积演化特征,使各地区盆地具有不同的生物气成藏条件,生物气藏主要分布于桂西和滇东—黔南地区的始新世—渐新世和上新世盆地中.在各盆地中,受沉降速度、沉积相带、烃源岩埋深、断层发育密度、圈闭类型和地层剥蚀程度等控制,各区带的生物气成藏条件也存在明显区别,生物气藏分布在各盆地的深凹及其相邻区带.

Under the "land-to-land" collision and matching structural action of the Indian Plate to the Euro-Asian Plate, a series of small intermountain strike-slip and pull-apart basins of the Eocene-Oligocene, the Miocene and the third stage of the Pliocene were formed along large strike-slip fault zones in Guangxi, West Yunnan and East Yunnan-South Guizhou areas during the Himalayan Ⅰ,Ⅱ and Ⅲ episodes. Three stages of the basins developed in three areas had different structural and sedimentary evolutionary characteristics, and resulted in different pool-forming conditions of biogases for the basins of each area. Biogas pools mainly distributed in the Eocene-Oligocene and the Pliocene basins in West Guangxi and East Yunnan-South Guizhou areas. In each basin, controlled by fall velocity, sedimentary facies zones, source rock depth, fault developing density, trap types and stratigraphic denuded degree, biogas pool-forming conditions were clearly different in each zone. Biogas pools distributed in the deep sags and adjacent zones of each basin.

https://doi.org/10.11781/sysydz200406525