Characteristics of the Lower Cretaceous source rock in Biru Basin, Tibet

doi:10.7623/syxb201205011

Editorial office of ACTA PETROLEI SINICA ›› 2012, Vol. 33 ›› Issue (5): 822-829.DOI: 10.7623/syxb201205011

• Petroleum Exploration • Previous Articles Next Articles

Characteristics of the Lower Cretaceous source rock in Biru Basin, Tibet

WANG Xianmei 1　ZHENG Herong 1　WANG Yi 1　QI Kailing 2　WU Xinhe 1

Received:2012-01-24 Revised:2012-06-23 Online:2012-09-25 Published:2012-11-27

西藏比如盆地下白垩统烃源岩特征

王先美 1　郑和荣 1　王　毅 1　祁开令 2　伍新和 1

1　中国石化石油勘探开发研究院　北京　100083；2　中国石化南方勘探公司　四川成都　610041

通讯作者: 王先美
作者简介:王先美，男， 1967年 5月生，2007年获中国科学院地质与地球物理研究所博士学位，现为中国石化石油勘探开发研究院高级工程师，主要从事石油地质、构造地质研究。
基金资助:
国家自然科学基金项目（No.41072160）和中国石化海相前瞻性项目“青藏特提斯活动古地理与油气远景”（T060007ZS15）资助。

Abstract

Abstract:

The Lower Cretaceous Duoni Formation in Biru Basin is dominated by paralic deposits with sedimentary structures of well-developed typical delta facies. Statistical data from different observation points of the residual basin, sample analyses and measurements showed that source rocks of Duoni Formation have a great accumulated thickness, dominant typeⅡ and type Ⅲ kerogens and a high abundance of organic carbon. The TOC ranges mostly from 0.40% to 1.20%, and R_o varies mainly between 2.0% and 5.0%, indicating a high to post maturity stage. Major factors that result in a higher maturity of Duoni Formation hydrocarbon source rock were preliminarily attributed to the Mesozoic regional metamorphism and local tectonic metamorphism caused by formation thickening of the Mesozoic folding, superimposition, magma intrusion and hydrothermal fluid having developed from the late Yanshanian to Himalayan stages under unique evolutionary settings of the Tethys structural domain. As one of residual basins of Tibet, Biru Basin is of Mesozoic source rocks with higher R_o values and regional differences in thermal evolution, therefore, the tectonic evolutionary history of the Himalayan stage should be regarded as a key factor controlling oil & gas accumulation and preservation conditions in Tibet Plateau.

Key words: Biru Basin, Mesozoic, organic matter abundance, maturity of organic matter, organic matter type

摘要：

比如盆地下白垩统多尼组以海陆过渡相沉积体系为主，发育典型三角洲相沉积构造。通过对残留盆地不同部位观测点数据统计、样品测试与分析，认为多尼组烃源岩累计厚度巨大，有机质类型以Ⅱ1型与Ⅲ型为主，有机质丰度较高，TOC主峰分布在0.40%~1.20%；有机质R_o主峰分布在2.00%~5.00%，处于高—过成熟演化阶段。对多尼组烃源岩热演化指标R_o偏高的原因进行探讨，初步认为特提斯构造域独特的构造演化背景下，中生界的褶皱、堆垛加厚，以及燕山期—喜马拉雅期岩浆、热液等方面作用引起的中生界区域变质作用与局部构造变质作用，是导致中生界有机质高演化及其出现演化程度地区性差异的重要因素。由此提出，青藏高原油气勘探与评价应注重喜马拉雅期构造演化对油气富集与保存的研究。

关键词: 比如盆地, 中生界, 有机质丰度, 有机质成熟度, 有机质类型

WANG Xianmei　ZHENG Herong　WANG Yi　QI Kailing　WU Xinhe. Characteristics of the Lower Cretaceous source rock in Biru Basin, Tibet[J]. Editorial office of ACTA PETROLEI SINICA, 2012, 33(5): 822-829.

王先美　郑和荣　王　毅　祁开令　伍新和. 西藏比如盆地下白垩统烃源岩特征[J]. 石油学报, 2012, 33(5): 822-829.

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Characteristics of the Lower Cretaceous source rock in Biru Basin, Tibet

西藏比如盆地下白垩统烃源岩特征

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