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东海盆地西湖凹陷平北地区有机质热演化特征及其主控因素

作    者:章 超1,2, 陈践发1, 朱心健1, 刘凯旋1, 张 涛3, 刘金水3
单    位:1油气资源与探测国家重点实验室(中国石油大学(北京)); 2中国石油浙江油田公司; 3中海石油(中国)有限公司上海分公司
基金项目:本文受国家科技重大专项子课题“西湖凹陷深层大中型气田成藏机理及模式研究”资助
摘    要:
东海盆地西湖凹陷平北地区有机质热演化在垂向上具有明显的分段特征,深部超压地层相较于浅部常压地层有机质热演化的速率明显偏大。目前已有的研究多从镜质组反射率等单一因素来分析有机质热演化的分段性特征,缺乏系统全面的研究,且未对可能造成这一现象的因素进行分析。在前人研究的基础上,对可能造成有机质热演化分段性的有机质组成特征、地下流体的影响、热导率的变化和超压作用的影响等因素进行综合分析,对西湖凹陷平北地区有机质热演化做了系统的研究。研究结果表明:超压发育的深度与有机质热演化出现分段特征的深度具有很好的吻合性,超压作用是造成西湖凹陷平北地区有机质热演化在垂向上具有分段性特征的主要因素。
关键词:镜质组反射率; 有机质热演化; 超压作用; 平北地区; 西湖凹陷; 东海盆地

Characteristics of organic matter thermal evolution and its main controlling factors in Pingbei area of Xihu Sag

Author's Name: ZHANG Chao, CHEN Jianfa, ZHU Xinjian, LIU Kaixuan, ZHANG Tao, LIU Jinshui
Institution: 
Abstract:
The thermal evolution of organic matter in Pingbei area of Xihu Sag in the East China Sea Basin has obvious segmented characteristics in vertical direction, and the thermal evolution rate of organic matter in deep overpressure formation is obviously higher than that in shallow normal pressure formation.At present, most of the existing studies analyze the segmented characteristics of organic matter thermal evolution from the single factor such as vitrinite reflectance, and lack of systematic and comprehensive research, and do not analyze the factors that may cause this phenomenon. On the basis of previous studies, this paper makes a comprehensive analysis of the organic matter composition characteristics, the influence of underground fluid, the change of thermal conductivity and the influence of overpressure on the thermal evolution of organic matter in Pingbei area of Xihu Sag. The results show that the depth of overpressure development is in good agreement with segmented depth of the thermal evolution of organic matter. Overpressure is the main factor causing the vertical segmented characteristics of organic matter thermal evolution in Pingbei area of Xihu Sag.
Keywords: vitrinite reflectance; organic matter thermal evolution; overpressure; Pingbei area; Xihu Sag; the East China Sea Basin
投稿时间:2020-12-22  
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