PDF《郑丹珠江口盆地惠州凹陷泥岩压实特征及其成因_郑丹》

第32 卷第4期2010 年12 月 地球科学与环境学报 Journal of Earth Sciences and Environment Vol .

32 No .

4 Dec .

2010 收稿日期 :

2010 -04-14 基金项目 : 国家油气重大专项项目( 2008ZX05023-01) 作者简介 : 郑丹(

1984 - ) , 男,河南邓州人 , 工学硕士研究生 , 从事油气地质研究 . E-mail: danzhcug @sina . com 珠江口盆地惠州凹陷泥岩压实特征及其成因 郑丹, 徐思煌, 尚小亮 ( 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) 摘要 :为了弄清楚珠江口盆地惠州凹陷新生界地层泥岩压实与油气生成和聚集的关系, 首先探讨了该地区泥岩压 实的特征, 并运用最高热解温度和生烃指数等对欠压实的成因进行了讨论. 研究表明: 从纵向上来看, 惠州凹陷内 发育浅部快速压实段、正常压实段和低幅度欠压实段等

3 种类型, 浅部快速压实段主要发育在深度小于

700 m 的 万山组和第四系地层, 正常压实段自万山组底部或者粤海组顶部到珠海组底部或者恩平组顶部(

1 800~

3 200 m) , 低幅度欠压实段自恩平组顶部向深部延伸到文昌组(

2 400~

4 000 m);

从横向上来看, 惠州凹陷划分为东北部和中 西部两个具有不同欠压实特征的区域, 东北部欠压实区地层发育珠江组―韩江组和文昌组―恩平组

2 个低幅度欠 压实段, 中西部欠压实区只发育文昌组―恩平组欠压实段;

珠江组―韩江组欠压实段主要由泥质高含量和快速沉 积沉降引起, 文昌组―恩平组欠压实段主要由沉积作用、高地热值和生烃作用共同引起, 后者为有效生油段 ;

惠州 凹陷新生界地层砂岩不存在超压. 关键词:泥岩;

压实作用;

生烃作用;

新生界地层;

惠州凹陷;

珠江口盆地 中图分类号:TE121.

1 +

2 文献标志码:A 文章编号:1672-6561( 2010)

04 -0372 -06 Characteristics and Genesis of Mudstone Compaction in Huizhou Depression , Pearl River Mouth Basin ZHENG Dan , XU Si-huang , SHANG Xiao-liang ( Key Laboratory of Tectonics and Petroleum Resources of Ministry of E ducation , ChinaUniversity of Geosciences, Wuhan 430074, H ubei, China) Abstract:In order to find out the relationship between the mudstone compaction in Cenozoic Strata and the generation and accumulation of hydrocarbon in H uizhou Depression , Pearl River Mouth Basin, characteristics of mudstone compaction were analyzed, genesis of undercompaction was discussed based on maximum pyrolysis temperature and hydrocarbon generation index .The results showed that three different types of compactions in longitudinal direction w ere rapid compaction in shallow layer , normal compaction and low amplitude undercompaction , rapid compaction in shallow layer w as mainly developed in Wanshan Formation and Pleistocene S trata ( less than

700 m), normal compaction w as mainly developed from the bottom of Wanshan Formation or the top of Yuehai Formation to the bottom of Zhuhai Formation or the top of Enping Formation(

1 800-3

200 m), and low amplitude undercompaction was mainly developed from the top of Enping Formation to Wenchang Formation (2

400 -4

000 m);

Huizhou Depression was divided into northeast and midw est undercompactions , northeast undercompaction developed tw o low amplitude undercompactions from Zhujiang Formation to Hanjing Formation and from Wenchang Formation to Enping Formation , midw est undercompaction developed one undercompaction from Wenchang Formation to Enping Formation;