烃源岩生气增压定量评价模型及影响因素

郭小文; 何生; 刘可禹; 董甜甜

doi:10.3799/dqkx.2013.123

烃源岩生气增压定量评价模型及影响因素

doi: 10.3799/dqkx.2013.123

郭小文^{1, 2,},
何生¹,
刘可禹^{2, 3},
董甜甜⁴

1.
中国地质大学构造与油气资源教育部重点实验室, 湖北武汉 430074
2.
中国石油勘探开发研究院, 北京 100083
3.
澳大利亚联邦科学与工业研究组织地球科学与资源工程, BentleyWA 6102
4.
中国石油辽河油田分公司, 辽宁盘锦 124010

基金项目:

国家自然科学基金项目 41302110

中国地质大学构造与油气资源教育部重点实验室开放基金 TPR-2013-17

详细信息

作者简介:
郭小文(1980-), 男, 副教授, 主要从事油气地质方面研究.E-mail: cuggxw@163.com

中图分类号: TE122
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出版历程
- 收稿日期: 2012-11-24
- 刊出日期: 2013-06-01

A Quantitative Estimation Model for the Overpressure Caused by Natural Gas Generation and Its Influential Factors

GUO Xiao-wen^{1, 2
,},
HE Sheng¹,
LIU Ke-yu^{2, 3},
DONG Tian-tian⁴

1.
Key Laboratory of Tectonics and Petroleum Resources, Ministry of Education, China University of Geosciences, Wuhan 430074, China
2.
Research Institute of Petroleum Exploration and Development, Beijing 100083, China
3.
CSIRO Earth Science and Resource Engineering, BentleyWA 6102, Australia
4.
Liaohe Oilfield Subcompany, PetroChina, Panjin 124010, China

摘要

摘要: Ⅲ型干酪根烃源岩生气增压定量评价是一个复杂过程, 因为Ⅲ型干酪根以生气为主的同时伴生少量的油生成, 而且在达到一定的温度条件下原油还将逐渐裂解成天然气.在考虑烃源岩生烃过程中天然气的渗漏和排出、氢指数对生烃量的影响、原油裂解成气、生烃作用产生的超压对孔隙水, 油和干酪根的压缩作用、天然气在孔隙水和石油中的溶解作用等因素的基础上建立了Ⅲ型干酪根烃源岩生烃增压定量评价模型, 并对模型参数进行敏感性分析.Ⅲ型干酪根烃源岩生气增压受到烃源岩孔隙度、成熟度、有机质丰度、天然气残留系数等多种参数的影响.有机碳含量、氢指数和天然气残留系数3个参数中以氢指数对Ⅲ型干酪根烃源岩生烃增压产生的影响最大, 天然气残留系数影响最小.天然气残留系数只要大于0.2就可以产生超压, 表明保存条件不是Ⅲ型干酪根烃源岩形成生烃增压最主要的控制因素.
- 烃源岩 /
- 生气增压 /
- 定量模型 /
- 参数敏感性 /
- 天然气 /
- 残留系数 /
- 干酪根
Abstract: It is very complicated to quantitatively estimate the overpressure caused by natural gas generation in the source rocks with type Ⅲ kerogen firstly due to the small amount of the associated oil to the dominant gas generated and secondly due to the fact that thermal cracking of liquid oil occurs with the increasing depth and temperature. In this paper, a quantitative estimation model for the overpressure change due to natural gas generation is proposed, taking into consideration the episodic natural gas leakage and expulsion, and parameters such as effect of hydrogen index on hydrocarbon generation, thermal cracking of liquid oil to natural gas, the compressibility of kerogen, oil and water, natural gas solution within the water and remaining oil, and so on. In addition, sensitivity analyses of parameters such as residual natural gas coefficient, TOC and hydrogen index have been carried out. Many parameters can affect overpressure due to natural gas generation including source rock porosity, maturity, organic matter abundance, residual natural gas coefficient and so on. Sensitivity analyses indicate that the hydrogen index is the most effective parameter on the pressure change due to natural gas generation in the source rocks and the residual natural gas coefficient has the least effect on the pressure change. Overpressure can be generated when the residual natural gas coefficient is as low to 0.2, suggesting that the pressure seal in the source rock is not the most important parameter for the overpressure development caused by natural gas generation in the source rocks.
- source rock /
- natural gas generated overpressure /
- quantitative model /
- sensitivity analysis /
- natural gas /
- residual coefficient /
- kerogen

HTML全文

图 1 烃源岩生烃增压概念模型

Fig. 1. The concept model of overpressure caused by hydrocarbon generation of source rocks

下载: 全尺寸图片幻灯片

图 2 Ⅲ型干酪根生烃特征以及油气生成率与转化率的关系

Fig. 2. Characters of modeled oil and natural gas generation for the source rocks with type Ⅲ kerogen and relationship between the transformation ratio and hydrocarbon (oil and gas) generation ratio

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图 3 Ⅲ型干酪根生烃作用形成的超压和压力系数随深度变化关系

Fig. 3. Relations of natural gas generated overpressures and pressure coefficients with depths

下载: 全尺寸图片幻灯片

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