柴达木盆地一里坪地区上新统狮子沟组生物气成藏研究  

RESEARCH ON BIOGENETIC GAS RESERVOIR FORMATION OF SHIZIGOU FM ON PLIOCENE IN YILIPING OF THE CAIDAM BASIN

作　　者：刘成林[1] 蒋助生[2] 李剑[2] 谢增业[2] 姜桂凤[3] 王金鹏[3] 

机构地区：[1]石油大学 [2]中国石油勘探开发研究院廊坊分院 [3]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14-16,共3页Natural Gas Industry

摘　　要：通过生物气模拟实验、生物气生成条件及储盖条件分析，建立起柴达木盆地一里坪地区上新统狮子沟组（Ｎ２３）生物气成藏模式。首先，根据厌氧微生物菌群的检测与计数和模拟生化产气实验，证实一里坪 Ｎ２３天然气为生物气。其次，根据生物气形成机理的特殊性，从沉积相、古气候条件及温度条件分析生物气形成条件，认为一里坪地区 Ｎ２３沉积湖盆总体水体多为微咸至咸水环境，草本植物丰富，奠定了生物气形成的物质基础，高盐度和低温条件减缓了沉积有机质向生物气的转化进程，使生物气的下限深度增加。然后，对储盖层条件进行分析，认为一里坪地区 Ｎ２３生物气储层和盖层条件不错，盖层封盖机理有物性差异封闭和烃类浓度封闭两种。最后，建立了一里坪地区Ｎ２３生物气动态成藏模式，整个成藏过程可分为游离散失、水溶气藏、纯气藏－水溶气藏和水溶气藏－纯气藏四个阶段。The forming history of biogenetic gas reser voir is discussed at Shizigou FM on Pliocene in Yiliping of the Caidam Basin. Firstly,natural gas of Shizigou FM is testified as biogenetic gas by the biogenetic gas simulating experiment. Sec ondly, producing mechanism of biogenetic gas is different from that of conventional natural gas. Through analyzing sedimentary facies, ancient climate, and temperature, the producing conditions of biogenetic gas are clear and higher salinity and lower temperature make it possible for biogenetic gas to appear on the deeper formation. Next,the reservoir and cap conditions are fine on Shizigou FM of Pliocene in Yiliping. There are two kinds of preserving mechanism, one is reservoirs physical property variation preservation,the other is hydrocarbon density preservation. In the end, the model of reservoir forming is constructed and biogenetic gas reservoir formation process is divided into four phases, which are free gas escaping phase, water-soluble gas reservoir phase, water-soluble gas containing net gas reservoir phase,and net gas water-containing soluble gas reservoir phase.

关 键 词：柴达木盆地 上新世 生物气 沉积相 储集层 盖层 气藏形成 

分 类 号：P618.13[天文地球—矿床学]