十屋断陷天然气成因类型初探  

Preliminary Study on Genetic Types of Natural Gas in Shiwu Fault Depression

作　　者：宋振响[1] 郜建军[1] 周卓明[1] 

机构地区：[1]中国石油化工股份有限公司石油勘探开发研究院无锡石油地质研究所,江苏无锡214151

出　　处：《天然气地球科学》2012年第1期167-174,共8页Natural Gas Geoscience

基　　金：中国石油化工股份有限公司科技部项目(编号:P09026)资助

摘　　要：在天然气组分组成、轻烃参数及组分碳同位素分析基础上,讨论十屋断陷不同地区的天然气成因类型。研究结果显示十屋断陷天然气主要存在伴生气和气藏气2种赋存状态,然后按照母质来源及热演化程度的差异又细分为4种成因类型:秦家屯地区、太平庄地区及七棵树地区的天然气多为伴生气,从能够反映母质类型和成熟度的轻烃参数及组分碳同位素特征来看,综合判识为偏腐泥型热解气;皮家地区、八屋地区、十屋地区及四五家子地区天然气多为气藏气,综合判识为过渡型裂解气;孤家子地区天然气为气藏气,碳同位素分布序列发生完全倒转,指示可能有无机气的混入,综合判断为高成熟腐殖型混合气;后五家户地区也为气藏气,碳同位素分布序列发生完全倒转和部分倒转,也显示可能有无机气的混入,综合判识为高成熟过渡型混合气。This paper discussed the genetic types of natural gases in Shiwu fault depression based on the analyses of gas component composition, light hydrocarbon parameters and carbon isotopic compositions. The result indicates that the natural gases in Shiwu fault depression can be divided into two categories：Associated gas and independent reservoir gas, furthermore, the gases can subdivided into four types according to organic matter origin and thermal evolution stages. Most of the natural gas in Qinjiatun,Taipingzhuang and Qikeshu areas is associated gas, belonging to partial sapropelic pyrolysis gas based on light hydrocarbon parameters and carbon isotopic compositions which can reflect the organic types and thermal evolution degrees. The natural gas in Pijia,Bawu,Shiwu and Siwujiazi areas is independent reservoir gas,belonging to transitional cracking gas. The natural gas in Gujiazi is independent reservoir gas,and belongs to high matu- rity humic mixed gas judged by the completely reversal carbon distribution series indicating inorganic gas mixed. The natural gas in Houwujiahu also belongs to independent reservoir gas and the carbon distribution series show completely reversal or partly reversal,indicating inorganic gas mixed, thus belonging to high maturity transitional mixed gas.

关 键 词：倒序 碳同位素 无机成因 轻烃 天然气成因 十屋断陷 

分 类 号：TE122.113[石油与天然气工程—油气勘探]