Characteristics of natural gas generation of source rocks in major petroliferous basins in offshore China

Huang Zhengji

doi:10.11743/ogg20050404

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Characteristics of natural gas generation of source rocks in major petroliferous basins in offshore China
Vol. 26, Issue 4, Pages: 422-426(2005)
Online First：25 August 2005，

Published：2005
DOI： 10.11743/ogg20050404
稿件说明：

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DOI：

Huang Zhengji. Characteristics of natural gas generation of source rocks in major petroliferous basins in offshore China[J]. 2005, 26(4): 422-426. DOI： 10.11743/ogg20050404.

摘要

采用天然气源岩定量评价技术

对中国近海海域主要含油气盆地各类烃源岩的天然气产出能力及成气规律作了探索与研究

获得的初步认识是:1)琼东南、珠江口和东海3个盆地所发育的煤系烃源岩有很高的天然气产率

天然气产出均出现了两个成气高峰

表现出成气窗很宽的特征;2)莺歌海盆地海相烃源岩有机质组成以陆源有机质为主

天然气生成也具产率高、成气窗宽的特征;3)渤海、东海、珠江口和北部湾盆地湖相烃源岩除个别iv型泥岩有高的产气率之外

各湖盆广泛分布的

型泥岩只有较高的产气率

天然气大量产出仅出现一个成气高峰

表现为单峰型

其成气窗远窄于煤系与海相烃源岩。

Abstract

Quantitative evaluation technologies of gas source rocks are used to study the gas generating capacity of various source rocks in the major petroliferous basins in offshore China.The following understandings have been achieved: ① gas yields of coal-measure source rocks in Qiongdongnan basin

Pearl River Mouth basin and East China Sea basin are very high.Gas generations in these three basins have the characteristics of dual peaks and wide gas windows;② marine source rocks in Yinggehai basin are mainly composed of terrestrial organic matters

and gas generation in this basin is also characterized by high gas yield and wide gas window;③ as to the lacustrine source rocks in Bohai

East China Sea

Pearl River Mouth and Beibuwan basins

except for some mudstones with typeⅠkerogen have high gas yield

the mudstones with type

kerogen which are widely distributed in these lake basins have relatively high gas yield and only a single peak of gas generation.Their gas windows are much narrower than that of coal-measures and marine source rocks.