Evaluation of Carboniferous source rocks in Qaidam area

doi:10.7623/syxb201006007

Editorial office of ACTA PETROLEI SINICA ›› 2010, Vol. 31 ›› Issue (6): 913-919.DOI: 10.7623/syxb201006007

• Petroleum Exploration • Previous Articles Next Articles

Evaluation of Carboniferous source rocks in Qaidam area

YANG Chao CHEN Qinghua WANG Guanmin LIAO Qianyu PANG Xiaojun MA Tingting

Received:2010-04-25 Revised:2010-07-15 Online:2010-11-25 Published:2011-01-20

柴达木地区上古生界石炭系烃源岩评价

杨超陈清华王冠民廖黔渝庞小军马婷婷

中国石油大学地球资源与信息学院山东青岛 266555

通讯作者: 杨超
作者简介:杨超，男，1979年8月生， 2007年获中国石油大学构造地质学硕士学位,现为中国石油大学在读博士研究生，主要研究方向为盆地构造解析、储层建筑结构与储层建模。
基金资助:
国家科技重大专项（2008ZX05005-004）资助。

Abstract

Abstract:

Organic geochemistry measurements and analyses were conducted on Carboniferous dark-colored mudstones, carbonates, coals and carbonaceous mudstones in marginal areas around the Qaidam Basin. The results indicated that the Carboniferous source rock consists predominantly of dark-colored mudstones among which coals and carbonaceous mudstones probably have hydrocarbon-generative potential. The lower Carboniferous dark-colored mudstone generally has poor to moderate contents of organic carbon, while the upper Carboniferous one contains a good or very good abundance of organic carbon. However, the upper and lower Carboniferous dark-colored limestone shows a lower content of organic carbon, constituting only a non-to poor-source rock. Mudstones with good source potential developed mainly in deposits of tidal flat, lagoon and marsh facies and horizons occurring in the middle Huaitoutala Formation, Keluke Formation and the lower Zhabusagaxiu Formation were evaluated as a good or very good source rock. Organic matter in the samples is mainly dominated by type II and III kerogens, and all the source rocks, except for the Dulan and Geermu areas where they have been at the post-mature stage to generate dry gases, are in a peak period of oil generation and expulsion with a moderate maturity of organic matter, thus, they have a good petroleum prospect.

Key words: Qaidam Basin, Carboniferous, hydrocarbon source rock, abundance of organic matter, type of organic matter, maturity of organic matter

摘要：

通过柴达木盆地周缘地区上古生界暗色泥岩、碳酸盐岩、煤及碳质泥岩的有机地球化学的测试分析，研究结果表明，石炭系烃源岩主要以暗色泥岩为主,炭质泥岩和煤可能具有生烃能力。下石炭统暗色泥岩有机碳含量一般达到了差到中等，而上石炭统暗色泥岩有机碳含量达到好或者很好；上、下石炭统的暗色灰岩有机碳含量均比较低，一般仅为非到差等烃源岩。有机碳评价较好的泥岩主要发育在潮坪、泻湖、沼泽相沉积相类型中；剖面上评价较好的层位为怀头他拉组的中部和克鲁克组及其扎布萨尕秀组的下段，评价结果已经达到好到很好等级。样品中的有机质类型均以Ⅲ型和Ⅱ₂型为主。除都兰、格尔木地区有机质成熟度过高、处于过成熟的生干气阶段外,其他地区有机质成熟度中等,正处于生烃、排烃高峰期,具有良好的油气勘探前景。

关键词: 柴达木盆地, 石炭系, 烃源岩, 有机质丰度, 有机质类型, 有机质成熟度

YANG Chao CHEN Qinghua WANG Guanmin LIAO Qianyu PANG Xiaojun MA Tingting. Evaluation of Carboniferous source rocks in Qaidam area[J]. Editorial office of ACTA PETROLEI SINICA, 2010, 31(6): 913-919.

杨超陈清华王冠民廖黔渝庞小军马婷婷. 柴达木地区上古生界石炭系烃源岩评价[J]. 石油学报, 2010, 31(6): 913-919.

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Evaluation of Carboniferous source rocks in Qaidam area

柴达木地区上古生界石炭系烃源岩评价

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