摘要
在岩性、热解参数等原生性识别和碳酸盐烃源岩评价的基础上，经统计有机质丰度、类型、性质，确定有机质成熟度与演化阶段，进行综合评价与对比后，对研究区烃源岩的生烃能力作出了综合评价，认为原始生烃母质属Ⅰ—Ⅱ1型，具有中等生烃强度的烃源岩特点，属较好烃源岩范畴，研究认为，鄂尔多斯下古生界碳酸盐烃源岩具有三段式四阶段的生烃演化特征，即以见R0=0．65％、1．50％、2．25％划分为低成熟、成熟、高成熟三段式和热裂解气生成的第四阶段。第四阶段主要处于过成熟阶段，以残余干酪根的热裂解以生成高温甲烷干气为特征，马家沟组中下部和寒武系正处于这一成烃演化阶段。
Based on primary lithology, thermolysis parameter of Lower Paleozoic carbonate source rocks in Ordos Basin,the abundane,types and nature of organic matter in the source rocks are used to determine the maturity and evolution stages of organic matter and estimate hydrocarbon generation ability of the study area. It is considered the kerogen wasⅠ-Ⅱ1 types with middle-intensity hydrocarbon generation. It is emphasized that hydrocarbon generation of LowerPaleozoic carbonate source rocks can be divided into three phases including four stages, that is, low-maturation phase with R0 = 0.65%;maturation phase with R0 = 1. 50% and high-maturation phase with R0= 2.25%, and the fourthstage of over-maturated pyrolysis gas stage. In this stage, residual kerogen was pyrolyzed and dry gas of high-tempraturemethan was generated. The source rocks of middle-lower parts of Majiagou Formation and the Cambrian System in thestudy area are of this stage.
出处
《石油与天然气地质》
EI
CAS
CSCD
北大核心
1999年第4期349-353,共5页
Oil & Gas Geology
基金
九五国家重点科技攻关二级专题!96-110-04-04-02
关键词
海相
碳酸盐岩
烃源岩评价
下古生界
成烃特征
marine facies
carbonate rock
source rock evaluation
organic matter abundance
Lower Paleozoic
Ordos
