摘要
陆良是我国滇黔桂地区为数不多的产出工业天然气的盆地。根据碳同位素与氦同位素以及气组成分析 ,表明该区所产天然气为典型的生物甲烷气。有机地球化学分析显示 ,陆良盆地上第三系为气源岩 ,含有较高的有机质丰度 (有机碳平均值达 1.0 4% ,氯仿沥青“A”平均值达 0 .485 % ) ,热解生烃潜量均大于 0 .5。多项地化分析证明 ,生烃有机质类型为Ⅱ2 型干酪根 ,且为未成熟烃源岩。极佳的生气母质类型与丰富的有机质、低矿化度水化学特征、地温适中、未成熟的烃源岩及良好的构造—岩性圈闭等因素 ,是形成陆良盆地工业性生物甲烷气藏的良好条件。在滇黔桂地区 ,存在为数不少类似陆良的构造与地球化学条件的盆地 。
Luliang Basin is one of a few commercial gas produced basins in Dian Qian Gui region in China.According to the results of carbon and helium isotopic analyses and gas component analysis,it is thought that the natural gas produced in the region belongs to a typical biogenic methane gas.In light of organic geochemical analysis,it is shown that in Luliang Basin the gas source rocks belong to Neogene,being of high organic matter abundance (the average of TOC is 1.04% and that of chloroform bitumem “A” 0.485%) and the pyrolytic source potential being more than 0.5 mg/g.It is proved by many terms of geochemical indicators that the hydrocarbon source rocks are immature,containing Type Ⅱ 2 kerogens.Luliang Basin is of a series of good conditions of forming commercial biogenic methane gas reservoirs,such as the excellent type of kerogen,high organic matter abundance,low salinity hydrochemical property,suitable geotherm,immature hydrocarbon source rocks and fair structural lithological traps,etc.In Dian Qian Gui region there are many basins which structural and geochemical conditions are similar to Luliang Basin,so that possible more gas reservoirs will be able to be found in this region.
出处
《天然气工业》
EI
CAS
CSCD
北大核心
2000年第3期12-15,共4页
Natural Gas Industry
关键词
云南陆良
生物气
天然气勘探
地球化学
烃源岩
Yunnan
Luliang
Biogas
Late Tertiary Period
Organic matter abundance
Dian Qian Gui
Gas reservoir
