柴达木盆地第四系生物气的成藏条件及控制因素  

THE ESSENTIAL CONDITIONS AND CONTROLLING FACTORS OF FORMATION OF QUATERNARY BIOGENIC GAS RESERVOIRS

作　　者：管志强[1] 徐子远[1] 周瑞年 姜桂凤[1] 

机构地区：[1]中油股份青海油田分公司勘探开发研究院

出　　处：《天然气工业》2001年第6期1-5,共5页Natural Gas Industry

基　　金：本文内容属于'九五'国家重点天然气科技攻关项目部分科研成果。

摘　　要：柴达木盆地第四系沉积时，气候寒冷干燥，水体含盐度高，有利于生物气的生成。从古气候、古水体、气源岩、储集层、封盖层以及圈闭条件、保存条件等方面阐述了该区第四系生物成因甲烷气的形成背景和聚集条件，并着重强调：充足的气源条件、良好的储盖组合以及适时的圈闭准备是第四系生物气形成规模聚集的前提条件，而良好的后期保存条件则是第四系生物气勘探取得成功的重要保障。根据统计资料和对已知气田的解剖研究结果，结合圈闭发育史和沉积相研究，建立了第四系生物气的动态成藏模式；阐明第四系生物气藏的纵向分布受源岩和盖层的共同控制，而气藏的横向分布则严格受控于构造圈闭。This article presents the formation environ ments and accumulation conditions of Quaternary biogenic methane gas from palaeoclimate, palaeocurrents, source rocks, reservoirs, seals, trapping conditions and preservation conditions. There also emphasizes that the preconditions of biogenic gas accumulating are sufficient sources, perfect combination of reservoir-and-seals and proper preparations of traps, and the late well-preserved conditions are the guarantee of successful exploration of biogenic gas. According to data statistics and research es of known oilfields, as well as researches of trap development and sedimentary faces, the dynamic accumulating model of Quarternary biogenic gas is founded. This article discusses the vertical and horizontal distribution regularities and controlling factors of biogenic gas pools, expounds that the vertical distri bution of biogenic gas pools is controlled by source rocks and seals and the horizontal distribution is strictly controlled by trap structure.

关 键 词：柴达木盆地 第四纪 生物气 气藏形成 控制因素 生储盖组合 气源岩 圈闭 

分 类 号：P618.13[天文地球—矿床学]