海相烃源岩的正反演对比分析

解习农; 殷鸿福; 谢树成

海相烃源岩的正反演对比分析

1.
中国地质大学资源学院, 湖北武汉 430074
2.
中国地质大学生物地质与环境地质教育部重点实验室, 湖北武汉 430074

基金项目:

中国石油化工股份有限公司海相油气勘探前瞻性项目 G0800-06-ZS-319

详细信息

作者简介:
解习农(1963-), 男, 教授, 主要从事能源地质与盆地流体的教学和科研工作.E-mail: xnxie@cug.edu.cn

中图分类号: P539.2;P618.130
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出版历程
- 收稿日期: 2007-08-12
- 刊出日期: 2007-11-25

Comparison on Forward and Inverse Analysis Methods of Marine Hydrocarbon Source Rocks

1.
Faculty of Earth Resources, China University of Geosciences, Wuhan 430074, China
2.
Key Laboratory of Biogeology and Environmental Geology of Ministry of Education, China University of Geosciences, Wuhan 430074, China

摘要

摘要: 海相优质烃源岩有效的评价体系是海相地层油气勘探开发中的关键问题之一.沉积盆地内保存的残余有机质从生物物质到烃源岩的演化过程经历了两个阶段, 即从生物物质到沉积有机质的形成阶段和从沉积有机质到残余有机质的烃源岩形成阶段, 后者包括沉积有机质在未熟阶段经历生物化学作用成为埋藏有机质和在成熟-过成熟阶段经历热解作用成为残余或风化残余有机质两个亚阶段.烃源岩反演分析是利用残余或风化残余有机质的量来推断埋藏有机质的量或者原始生烃潜力.而正演分析则是根据沉积物沉积环境、生物物质及其介质物理化学条件特征运用地球生态学、地球微生物学、分子地球生物学和生物地球化学方法推断沉积有机质的量, 甚至推断埋藏有机质的量, 进而评估烃源岩的原始生烃潜力, 也就是利用生物生产力和保存环境等综合分析沉积有机质的量.正反演对比分析相互验证和相互补充, 更好地揭示了烃源岩基本特征, 为海相优质烃源岩的预测和评价提供了有效的研究方法.
- 海相烃源岩 /
- 沉积有机质 /
- 埋藏有机质 /
- 残余有机质 /
- 评价体系
Abstract: An effective evaluation system of high-quality marine source rocks plays an important role in hydrocarbon exploration and exploitation of marine strata. Remnant organic matter preserved in a sedimentary basin underwent two evolutionary stages from organic matter to source rocks, i.e. the formation of deposited organic matter and the formation of source rocks transferring from deposited organic matter to remnant organic matter. The latter includes the immature stage during which the deposited organic matter experienced biogeochemical processes to become burial organic matter, and the mature and the post-mature stages during which the burial organic matter underwent geothermal processes to become remnant organic matter and subsequently to be weathered. The inverse analysis of source rocks is defined as a method and technique to estimate the amount of burial organic matter and original potential of hydrocarbon generation of source rocks based on the analysis of remnant or weathered organic matter. The forward analysis of source rocks is defined as a method to estimate the amount of depositional organic matter or burial organic matter, and ulteriorly to estimate their original potential of hydrocarbon generation of source rocks by using the information of sedimentary environments, features of living biomass and physical chemistry in water medium through the geobiological analysis of geoecology, geomicrobiology, molecular geobiology and biogeochemistry. Quality and quantity of depositional organic matter can be calculated according to the productivity and preservation environments. Comparison between the forward and the inverse analysis can be validated and complemented by each other, which would reveal the features of source rocks and provide an effective method for the prediction and evaluation of good-quality marine source rocks.
- marine source rocks /
- depositional organic matter /
- burial organic matter /
- remnant organic matter /
- evaluation system

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图 1 烃源岩中生物有机质演化过程及成岩阶段划分

Fig. 1. Evolution and diagenesis stages of sedimentary organic matters in the source rocks

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图 2 正反演方法应用范围对比

Fig. 2. Comparison between forward and inverse analysis methods

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