天然气地质学

沉积过程对莺歌海盆地烃源岩生气的控制作用

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  • 中海石油(中国)有限公司湛江分公司, 广东 湛江 524057
熊小峰(1986-),男,湖北应城人,工程师,硕士,主要从事石油天然气地球化学与成藏研究. E-mail:xiongxf@cnooc.com.cn.

收稿日期: 2016-05-26

  修回日期: 2016-08-08

  网络出版日期: 2019-09-06

基金资助

国家重大科技专项“莺琼盆地高温高压天然气富集规律与勘探开发关键技术”(编号:2016ZX05024-005)资助.

Controlling effects of sedimentation on organic matter maturation in Yinggehai Basin

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  • Research Institution,Zhanjiang Branch of CNOOC Ltd.,Zhanjiang 524057,China

Received date: 2016-05-26

  Revised date: 2016-08-08

  Online published: 2019-09-06

摘要

东方区与乐东区是莺歌海盆地2个主要天然气探区,2 个区中新统烃源岩有机质成熟度存在较大差异,表现为相同埋深时东方区有机质演化程度比乐东区高。在莺歌海盆地构造演化、温压场与烃源岩地球化学特征研究的基础上,通过沉积过程分析与盆地模拟相结合探讨有机质热演化差异的成因。研究认为:新近纪至第四纪盆地沉积沉降中心由东方区向乐东区迁移,导致二者在不同时期的沉积速率不同。尽管盆地的高温高压场对有机质热演化产生一定影响,但造成东方区与乐东区有机质热演化差异的主要原因是2个区不同的沉积速率。而有机质热演化差异造成了生气过程的差别:东方区生气时间早、持续时间长,而乐东区表现为晚期快速生气的特点,更有利于天然气的聚集成藏。乐东区中新统烃源岩生烃过程中有机酸的形成时间也较晚,有助于该储层次生孔隙的发育,因此乐东区成藏条件更优越,勘探前景良好。该成果不仅对莺歌海盆地天然气勘探具有重要的指导作用,同时对其他区域也具有较为广泛的借鉴作用。

本文引用格式

熊小峰, 徐新德, 郭潇潇, 梁刚, 罗威 . 沉积过程对莺歌海盆地烃源岩生气的控制作用[J]. 天然气地球科学, 2016 , 27(12) : 2169 -2175 . DOI: 10.11764/j.issn.1672-1926.2016.12.2169

Abstract

Both Dongfang and Ledong areas are the main exploration field in Yinggehai Basin.When the organic matter is buried in the same depth,the thermal maturation level of organic matter is higher in Dongfang area than that in Ledong area.The high temperature and overpressure systems have affected the thermal maturation.But,the main reason of the difference of thermal maturation between Dongfang area and Ledong area is the different deposition rates which is caused by the migration process of depocenter during Neogene-Quaternary.The depocenter migration marked a differentiation hydrocarbon generation between Dongfang area and Ledong area.In Dongfang area,the generation begins early and lasts a long time.But,in Ledong area,it initiates late but is fast.The organic acid is also formed late in Ledong area,which contributed to the formation of secondary pore in mid-depth formations.Therefore,there is good accumulation condition and favorable exploration prospect in Ledong area.

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