石油学报 ›› 1985, Vol. 6 ›› Issue (2): 31-38.DOI: 10.7623/syxb198502005

• 论文 • 上一篇    下一篇

鉴别煤成气和油型气若干指标的初步探讨

戴金星, 戚厚发, 宋岩   

  1. 北京石油勘探开发科学研究院
  • 收稿日期:1984-02-29 出版日期:1985-04-25 发布日期:2013-07-08

ON THE INDICATORS FOR IDENTIFYING GAS FROM OIL AND GAS FROM COAL MEASURE

Dai Jinxing, Qi Houfa, Sung Yen   

  1. Scientific Research Institute of Petroleum Exploration and Development Beijing
  • Received:1984-02-29 Online:1985-04-25 Published:2013-07-08

摘要: 鉴别煤成气和油型气的普遍性标志初步认为有:1.煤成气的甲烷碳同位素(δ13C1)一般比油型气的重:在Ro≤0.5%,煤成气和油型气δ13C1除-55‰至-74‰是重迭数域值外,当δ13C1<-74‰为油型气型生物成因气;在Ro>0.5%至-2.5%时,δ13C1-43‰至-30‰是煤成气与油型气重迭数域值,故δ13C1≤-43‰至-55‰的气是油型气;而δ13C1>-30‰的气是煤成气。2.煤成气中的汞蒸气比油型气的一般含量高。煤成气中平均汞含量一般在700毫微克/米3以上,多数大于1000毫微克/米3,而油型气中平均汞含量在600毫微克/米3以下,多数小于400毫微克/米3;煤成气中最高含汞量一般大于1000毫微克/米3,而油型气中的一般小于700毫微克/米3。3.当Ro为0.4%至1.35%时,一个含油层系形成以气为主以油为辅,这种气是煤成气。4.在与Ro0.4%至1.0%有成因关系的气中,若普遍见到凝析油,这种气是煤成气。

关键词: 煤成气, 油型气, 凝析油, 初步探讨, 毫微克, 甲烷碳同位素, 生物成因气, 四川盆地, 天然气, 鄂尔多斯盆地

Abstract: Four indicators have been mentioned for identifying gas from oil and gas from coal measure. (1)the carbon isotope of methane (σ~(13)C_1)in gas from coal measure is generally heavier than that from oil; (2) the content of mercury vaor in gas from coal measure is higher than that from oil; (3) in a basin or formation with Ro ranging 0.4 to 1.35% producing primarily gas and only a small amount of associated oil, the gas is from coal measure; and(4) if condensate oil is observed in the gas from a formation with Ro ranging 0.4 to 1.0%, the gas is from coal measure. Examples have been cited for illustrative purpose.