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干酪根裂解气和原油裂解气的成因判识方法
石油实验地质
2002年 24卷 第4期
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Title
GENETIC IDENTIFICATION METHOD OF KEROGEN-CRACKED GASES AND OIL-CRACKED GASES
Authors
CHEN Shijia
FU Xiaowen
MA Lining
CHEN Xinling
ZHANG Xiang
单位
西南石油学院, 四川, 南充, 637001
2. 中国石油, 青海石油勘探开发研究院, 甘肃, 敦煌, 736302
Organization
Southwestern Petroleum Institute, Nanchong, Sichuan 637001 China
2. Qinghai Petroleum Exploration and Development Institute, Dunhuang, Gansu 736302, China
摘要
天然气既可来源于干酪根的裂解气,也可来源于原油的裂解气。对于腐泥型有机质,绝大部分天然气是来自源岩生成的原油裂解气,只有部分来自干酪根的裂解气,因此天然气气源研究不仅要指出来自哪套源岩,还需指出它的成因,尤其是高演化地区天然气气源研究。该文以塔里木盆地海相腐泥型天然气为例,根据天然气组成ln(C2/C3)与(δ13C2-δ13C3)以及甲烷碳同位素特征判识其成因。塔北地区的干气主要为干酪根晚期裂解气,塔北英买力奥陶系及塔中石炭系的天然气主要为原油裂解气。
Abstract
Natural gas is not only originated from kerogen cracking,but also from oil cracking. For type Ⅰ or Ⅱ kerogen,most of natural gas is derived from cracking of oil generated from source rock during oil generation peak, only part of natural gas is originated from kerogen cracking directly. Genetic identification of kerogen and oil-cracked gases is very important for the study of natural gas sources and area exploration evaluation, especially for high maturity areas. Natural gas genesis in the North and Central Tarim was studied according to ln(C2/C3) and (δ13 C2-δ13 C3)of gas composition. The results showed that dry gas in the North Tarim is mainly kerogen-cracked gas,and gas in the Central Tarim is mainly oil-cracked one.
关键词：
成因判识;
干酪根裂解气;
原油裂解气;
塔里木盆地;
Keywords:
genetic identification;
kerogen-cracked gas;
oil-cracked gas;
the Tarim Basin;
基金项目
“九五”国家重点科技攻关项目(96-111-01-06-01);西南石油学院油气藏地质与开发工程国家重点实验项目(PLN99005)
DOI
https://doi.org/10.11781/sysydz200204364
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