张贺,李雅君,徐康宁,宋玲
ZHANG He,LI Yajun,XU Kangning,SONG Ling

• 1:中国地质大学(北京)海洋学院
• 2:中石油华北油田分公司勘探开发研究院

摘要(Abstract)：

恩平组是珠江口盆地主要烃源岩层之一。恩平组主要沉积了滨—浅湖相暗色泥岩,三角洲相炭质泥岩、煤系泥岩,有机质类型多样,生烃作用复杂。为探讨不同类型烃源岩的生烃特点,分别在惠州凹陷、白云凹陷选取了炭质泥岩(Ⅲ)、暗色泥岩(Ⅱ2)和煤系泥岩(Ⅱ-Ⅲ) 3个样品,进行热压模拟实验。结果表明:恩平组滨—浅湖相暗色泥岩具有较强的生烃潜力,产烃率可达383. 7 kg/t,主生油期(0. 76% 0. 76%)产气率提升明显;三角洲相炭质泥岩较早进入大量生气阶段(Ro> 0. 67%),产烃率为307. 3 kg/t;白云凹陷恩平组煤系烃源岩产烃率较低,为167. 3 kg/t;珠江口盆地油气资源分布受源热耦合作用共同控制,烃源岩类型制约了凹陷的生烃潜力,所经历的热演化过程控制了生烃产物的分布,白云凹陷及惠州凹陷中部深凹地区成熟度较高,天然气大量生成,惠州凹陷周缘成熟度相对较低,油气兼生。
Enping Formation is one of the major source rocks in Pearl River Mouth Basin. The shore-shallow lacustrine dark mudstone,delta carbonaceous mudstone and coal-measure mudstone are mainly deposited in Enping Formation. Due to various types of the organic matter,the hydrocarbon generating actions are rather complex. In order to explore and discuss the hydrocarbon generated features of different source rocks,3 samples including carbonaceous mudstone( Ⅲ),dark mudstone( Ⅱ2) and coal-measure mudstone( Ⅱ-Ⅲ) were collected from the Huizhou and Baiyun Sags for the thermocompression simulating experiment. The experiment results show that there werepretty stronger hydrocarbon-generating potential for Enping-Formation dark shore-shallow lacustrine mudstone,the generation ratio was up to 383. 7 kg/t,the main maturity stage( 0. 76% < Ro< 1. 20%) was greatly longer,the ratio of the gas generation increased obviously when Ro> 0. 76%; the delta carbonaceous mudstone early entered into the stage of a large amount of the gas generated( Ro> 0. 67%),the hydrocarbon generation ratio was 307. 3 kg/t;while for the coal-measure source rock in Baiyun Sag,the hydrocarbon generation ratio was relatively lower( 167. 3 kg/t); the distribution of the petroleum resources in Pearl River Mouth Basin is co-controlled by the source rocks and thermal coupling action,the hydrocarbon generation potential of the sag was restricted by the types of the source rocks,and the distribution of the generated hydrocarbon products was controlled by the thermal evolution process,the maturities in Baiyun Sag and deep Middle Huizhou Sag were pretty higher,so a large amount of the gas was generated,on the contrary,the maturity in the periphery of Huizhou Sag was rather lower,both oil and gas were generated.

关键词(KeyWords)： 热压模拟实验;生烃条件;烃源岩;恩平组;珠江口盆地
thermocompression simulation experiment;hydrocarbon-generating condition;source rock;Enping Formation;Pearl River Mouth Basin

Abstract:

Keywords:

基金项目(Foundation): 国家科技发展规划重大专项“南海北部深水区油气成因与运聚过程研究”下属专题“珠二坳陷油气资源评价及成藏动力研究”(2011ZX05025-003-004-001)

作者(Author): 张贺,李雅君,徐康宁,宋玲
ZHANG He,LI Yajun,XU Kangning,SONG Ling

DOI: 10.19597/j.issn.1000-3754.201805072

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