Source rock features of the middle-upper Jurassic Lagongtang Formation in Biru Basin, Tibet Plateau

doi:10.7623/syxb201101006

Editorial office of ACTA PETROLEI SINICA ›› 2011, Vol. 32 ›› Issue (1): 41-48.DOI: 10.7623/syxb201101006

• Petroleum Exploration • Previous Articles Next Articles

Source rock features of the middle-upper Jurassic Lagongtang Formation in Biru Basin, Tibet Plateau

WANG Xianmei WU Xinhe ZHENG Herong WANG Yi

Received:2010-06-05 Revised:2010-09-08 Online:2011-01-25 Published:2011-03-23

青藏高原比如盆地中-上侏罗统烃源岩

王先美伍新和郑和荣王毅

中国石油化工股份有限公司石油勘探开发研究院北京 100083

通讯作者: 王先美
作者简介:王先美，男， 1967年 5月生，2007年3月获中国科学院地质与地球物理研究所博士学位，现在中国石油化工股份有限公司石油勘探开发研究院工作工程师，主要从事石油地质、构造地质、地球物理研究。
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重建与油气远景》资助成果。

Abstract

Abstract:

The middle-upper Jurassic Lagongtang Formation, composed mainly of a turbidite depositional system of bathyal-deep sea facies, is characterized by an incomplete Bouma sequence. The statistic data of observations at different parts of the residual basin as well as the measurement and analysis on source rock samples showed that the Lagongtang Formation source rock had a huge accumulative thickness and contained organic matter dominated by typeⅠand type Ⅱ₁ kerogens. The source rock was characterized by abundant organic matter with TOC mostly ranging from 0.40% to 1.20%, and a high or even over maturity with R_omainly varying between 2.0%～5.0%. Under special evolutionary settings of the Tethys tectonic domain, the regional metamorphism and local structural deformation arising from the Mesozoic folding, stacking, thickening and the Yanshanian-Himalayan magmatic and hydrothermal alterations were likely to be the important factors that gave rise to high maturity of the Mesozoic organic matter and regional differences in maturity. Therefore, the paper suggested that the prospecting and assessment on hydrocarbon resources in Tibet Plateau should focus on the influence of the Himalayan tectonic evolution on oil-gas accumulation and preservation.

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

摘要：

比如盆地中上侏罗统拉贡塘组以一套半深海—深海相浊积沉积体系为主，不完整的鲍玛序列为其标志性沉积构造。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，认为拉贡塘组烃源岩累计厚度巨大，有机质类型以Ⅰ型与Ⅱ₁型为主，有机质丰度较高，TOC主峰分布在0.40%~1.20%；拉贡塘组有机质R_o主峰分布在2.0%~5.0%，处于高—过成熟演化阶段。对拉贡塘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—喜山期岩浆、热液等方面作用，引起中生界区域变质作用与局部构造变质作用，很可能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山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 WU Xinhe ZHENG Herong WANG Yi. Source rock features of the middle-upper Jurassic Lagongtang Formation in Biru Basin, Tibet Plateau[J]. Editorial office of ACTA PETROLEI SINICA, 2011, 32(1): 41-48.

王先美伍新和郑和荣王毅. 青藏高原比如盆地中-上侏罗统烃源岩[J]. 石油学报, 2011, 32(1): 41-48.

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Source rock features of the middle-upper Jurassic Lagongtang Formation in Biru Basin, Tibet Plateau

青藏高原比如盆地中-上侏罗统烃源岩

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