Organic Geochemistry of Triassic Source Rocks in the Southern Qilian Basin

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Organic Geochemistry of Triassic Source Rocks in the Southern Qilian Basin

XIE Qifeng¹, ZHOU Lifa¹, MA Guofu², TAN Xiuzhong², WAN Yanzhou³, LIANG Shiwei⁴, ZHANG Kai¹, ZHAO Junhui¹

1. State Key Laboratory of Continental Dynamics, Department of Geology, Northwest University, Xi’an 710069; 2. Institute of Petroleum Exploration and Development, Yumen Oilfield Company, PetroChina, Yumen 735200; 3. Exploration and Development Research Institute, Northwest Oilfield Company, Sinopec, Urumqi 830001; 4. Zhongyuan Oilfield Company, Sinopec, Puyang 457001;

Received:2010-12-01 Online:2011-11-20 Published:2011-11-20

南祁连盆地三叠系烃源岩有机地球化学特征

谢其锋¹,周立发¹,马国福²,谭修中²,万延周³,梁士伟⁴,张凯¹,赵俊辉¹

1. 大陆动力学国家重点实验室, 西北大学地质系, 西安 710069; 2. 中国石油天然气股份有限公司玉门油田分公司勘探开发研究院, 玉门 735200; 3. 中国石油化工集团公司西北油田分公司勘探开发研究院, 乌鲁木齐 830001; 4. 中国石油化工集团公司中原油田分公司, 濮阳 457001;

Abstract

Abstract: According to the outdoor profile survey, collection of samples in systematic and the organic geochemical analysis technique including rock pyrolysis, residual organic carbon content, kerogen analysis, organic maceral, vitrinite reflectance, gas chromatography of saturated hydrocarbon and transmitted light microscopy, the authors discussed organic matter abundance, type and maturity of T₃g carbonate and T₂d mudstone outcrop samples in the Southern Qilian Basin, the original sedimentary environment and bio-inputs of organic matter. The results show that T₃g carbonate belong to good source rocks, the organic matter is type Ⅰ~Ⅱ and T₂d mudstone is type Ⅱ~Ⅲ. The organic matter has a high degree of thermal evolution and is at the high and over mature stage. They are deposited in transitional and mainly terrestrial facies. Organic matters are mainly derived from aquatic plant and errestrial life biodegradation.

Key words: organic geochemistry, source rock, the Southern Qilian Basin, Triassic

摘要： 通过系统的野外剖面测量和样品采集, 并运用岩石热解、有机碳测试、干酪根分析、镜质体反射率、饱和烃气相色谱、透射光照射等技术进行室内样品测试, 综合评价了南祁连盆地三叠系碳酸盐岩和泥岩露头样品的有机质丰度、类型和成熟度, 探讨了有机质的原始沉积环境和生源特征。结果表明: 尕勒得寺组(T₃g)属于好烃源岩, 有机质类型为Ⅰ~Ⅱ型, 大加连组(T₂d)为Ⅱ~Ⅲ型; 有机质演化程度高, 处于高?过成熟阶段; 碳酸盐岩和泥质岩沉积环境分别为海陆过渡相和陆源为主; 碳酸盐岩与泥岩有机质生源分别为生物降解的水生生物和陆生生物。

关键词: 有机地球化学, 烃源岩, 南祁连盆地, 三叠系

CLC Number:

P593

XIE Qifeng,ZHOU Lifa,MA Guofu,TAN Xiuzhong,WAN Yanzhou,LIANG Shiwei,ZHANG Kai,ZHAO Junhui. Organic Geochemistry of Triassic Source Rocks in the Southern Qilian Basin[J]. .

谢其锋,周立发,马国福,谭修中,万延周,梁士伟,张凯,赵俊辉. 南祁连盆地三叠系烃源岩有机地球化学特征[J]. 北京大学学报（自然科学版）.

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