洞庭盆地第四系生物气地质特征及远景分析  

GEOLOGICAL CHARACTERISTICS OF QUATERNARY BIOGAS IN DONGTING BASIN AND ITS PROSPECTS

作　　者：黄泽新 罗小平 

机构地区：[1]中南石油地质局地质大队

出　　处：《石油与天然气地质》1996年第1期62-67,共6页Oil & Gas Geology

摘　　要：洞庭盆地面积约１．５×１０４ｋｍ２，是在元古代基底的基础上发育而成的中新生代断陷盆地。在新构造运动的影响下，几度沉降接受了厚达１００～３３４ｍ的第四系沉积。在洞庭湖区，普遍见生物气显示。生物气的聚集主要受控于气源条件及储集条件。富含有机质的暗色沉积物是良好的气源层，砂、砂砾层是生物气主要聚集场所。全新统上部的粘土或砂质粘土为区域性的良好盖层。肖家湾－鸭子港区及三仙湖－茶盘洲区是洞庭盆地第四系生物气勘探的有利区域。Dongting Basin,covering an area of 1. 5×104 km2,is a Meso-Cenozoic fault-depressedbasin developed on the basement of the Proterozoic.It subsided several times and received100￣334 m thick Quaternary sediments under the influence of neotectonic movement. Biogasshowing could be seen very often. The accumulation of the biogas is primarily controlled bygas source and reservoir conditions. The organic-rich dark sediments are good source beds;sand beds and gravel beds are major places for biogas accumulation, the clay and sand claybeds of the upper part of the Proterozoic are fine regional cap beds.It is suggested thatXiaojiawan-Yazigang and Sanxianhu-Chapanzhou regions are favourable for Quaternary biogas exploration of the basin.

关 键 词：洞庭盆地 第四系 生物气 地质特征 远景分析 

分 类 号：P534.63[天文地球—第四纪地质学]