基于珠一坳陷旋回地层分析的烃源岩沉积速率研究

李劭杰,何生，朱伟林，王晓龙，吴景富,程甜

doi:10.11764/j.issn.1672-1926.2014.09.1328

天然气地球科学 >

2014 , Vol. 25 >Issue 9: 1328 - 1340

DOI: https://doi.org/10.11764/j.issn.1672-1926.2014.09.1328

天然气地质学

基于珠一坳陷旋回地层分析的烃源岩沉积速率研究

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1.中国地质大学资源学院，构造与油气资源教育部重点实验室，湖北武汉 430074；2.中国海洋石油总公司，北京 100010；
3.长江大学地球物理与石油资源学院,湖北武汉 430100;
4.长江大学油气资源与勘探技术教育部重点实验室,湖北武汉 430100;
5.中海油研究总院,北京 100027;6.中国石油吐哈油田分公司勘探开发研究院,新疆哈密 839009

李劭杰(1990-)，男，山西阳泉人，硕士研究生，主要从事旋回地层及层序地层学研究. E-mail：lishaojie714@gmail com.

收稿日期: 2013-10-20

修回日期: 2014-03-17

网络出版日期: 2014-09-10

基金资助

“中国近海新生代盆地演化与油气聚集”项目；国家科技重大专项“渤海湾盆地精细勘探关键技术”(编号：2011ZX05006-002);高等学校学科创新引智计划资助项目(编号:B14031)联合资助.

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The Study on Sedimentation Rate of Source Rock Based onCyclostratigraphic Analysis in the Zhuyi Depression

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1.Key Laboratory of Tectonics and Petroleum Resources,Ministry of Education,Faculty of Earth Resources,
China University of Geosciences,Wuhan 430074,China;
2.China National Offshore Oil Corporation China Ltd,Beijing 100010,China;
3.Geophysics and Oil Resource Institute,Yangtze University,Wuhan 430100,China; 
4.Key Laboratory of Exploration Technologies for Oil and Gas Resources,Ministry of Education,Yangtze University,Wuhan 430100， China；
5.China National Off Oil Corporation Research Institute,China National Offshore Oil Corporation,Beijing 100027,China;
6.Petroleum Exploration and Development Research Institute of Tuha Oilfield Branch,PetroChina,Hami 839009，China.

Received date: 2013-10-20

Revised date: 2014-03-17

Online published: 2014-09-10

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摘要

珠江口盆地珠一坳陷发育3套烃源岩层系,自下而上有始新统文昌组、始新统—渐新统恩平组和渐新统珠海组。基于3套烃源岩层系的GR曲线资料，运用旋回地层分析方法(频谱分析技术及小波分析技术)实现了对珠一坳陷3套烃源岩层系天文周期的识别，并通过滤波技术精细计算了烃源岩沉积速率，得到2点基本认识：①珠一坳陷始新世—渐新世受天文周期影响，对应于天文周期(100ka偏心率周期、40ka斜率周期、20ka岁差周期)，文昌组存在厚度为19.8m、9.1m、3.8m 3种米兰科维奇旋回，恩平组存在厚度为17.0m、6.8m、3.4m 3种米兰科维奇旋回，珠海组存在厚度为9.2m、4.1m、1.8m 3种米兰科维奇旋回，其中偏心率周期的影响最为显著；②珠一坳陷3套烃源岩的沉积速率各自分布在一定的区间，不同沉积环境中烃源岩的沉积速率分布范围不同。文昌组中深湖相很好烃源岩沉积速率为8.50~14.00cm/ka，恩平组湖沼相好烃源岩沉积速率分布在8.00~15.50cm/ka之间，珠海组滨海相好烃源岩沉积速率分布在7.50~12.50cm/ka之间。



关键词： 沉积速率; 烃源岩; 米兰科维奇旋回; 天文周期; 偏心率周期; 珠一坳陷

本文引用格式

李劭杰,何生，朱伟林，王晓龙，吴景富,程甜 . 基于珠一坳陷旋回地层分析的烃源岩沉积速率研究[J]. 天然气地球科学, 2014 , 25(9) : 1328 -1340 . DOI: 10.11764/j.issn.1672-1926.2014.09.1328

Abstract

There are three series of source rocks in the Zhuyi Depression,Pearl River Mouth Basin,including Wenchang Formation (Eocene),Enping Formation (Eocene-Oligocene)and Zhuhai Formation (Oligocene).On the basis of GR curve,the astronomical orbital periods hidden in the source rock series are recognized by spectral analysis and wavelet analysis in the Zhuyi Depression.Meanwhile,the sedimentation rates of the source rocks have been calculated by utilizing band-pass filtering.Two conclusions have been obtained: (1)Sedimentation process in the Zhuyi Depression was influenced by the astronomical orbital periods from Eocene to Oligocene.Corresponding to the astronomical orbital periods (100ka Eccentricity,40ka Obliquity,20ka Precession),there are Milankovitch Cycles of 19.8m,9.1m and 3.8m in Wenchang Formation,17.0m,6.8m and 3.4m in Enping Formation,and 9.2m,4.1m and 1.8m in Zhuhai Formation respectively.Overall,Eccentricity had the most significant impact on these three formations.(2)Sedimentation rates of source rocks are in different ranges in different sedimentary environment.The sedimentation rates of Wenchang Formation′s excellent source rocks of middle-deep lacustrine facies lie between 8.50cm/ka and 14.00cm/ka.The sedimentation rates of Enping Formation′s good source rocks of limnetic facies lie between 8.00cm/ka and 15.50cm/ka.The sedimentation rates of Zhuhai Formation′s good source rocks of neritic facies lie between 7.50cm/ka and 12.50cm/ka.

Key words： Sedimentation rates; Source rocks; Milankovitch Cycles; Astronomical orbital cycles; Eccentricity; Zhuyi Depression

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