珠二坳陷白云凹陷海相烃源岩及其成藏贡献

郭玉峰, 杜秀琴, 傅宁

doi:10.11764/j.issn.1672-1926.2014.12.1975

天然气地球科学 >

2014 , Vol. 25 >Issue 12: 1975 - 1982

DOI: https://doi.org/10.11764/j.issn.1672-1926.2014.12.1975

天然气地质学

珠二坳陷白云凹陷海相烃源岩及其成藏贡献

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1.中国石油长庆油田分公司勘探开发研究院，陕西西安 710018；2.中海油研究总院，北京 100027

郭玉峰(1962-),男,陕西西安人，工程师，主要从事石油工程研究.E-mail:gyf_cq@petrochina.com.cn.

收稿日期: 2014-02-14

修回日期: 2014-03-25

网络出版日期: 2019-09-18

基金资助

国家重点基础研究发展规划(“973”) 项目“南海深水区盆地热演化与生烃作用研究”(编号:29CB219402)资助.

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Contribution of Marine Source Rock to Hydrocarbon Accumulation,Zhu ⅡSag

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1.Exploration and Development Research Institute of PetroChina Changqing Oilfield Company，Xi′an 710018,China;
2.China Research Institute,China National Offshore Oil Corporation,Beijing 100027,China

Received date: 2014-02-14

Revised date: 2014-03-25

Online published: 2019-09-18

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摘要

珠二坳陷白云凹陷海相烃源岩主要指的是海陆过渡相沉积背景下形成的海相烃源岩(恩平组和珠海组烃源岩)，该类烃源岩具有陆源生烃母质和海相生烃母质双源输入的混合特征，其生成的油气亦有双源成因的特征，烃源岩TOC平均值为1.2%，干酪根类型主要为Ⅱ₂型，具有油气兼生的能力。油源对比和混合比例估算表明，珠二坳陷白云凹陷目前所发现的轻质(凝析油)油可分为3类不同成因油:煤成油、海相油和混合油。白云凹陷北坡PY34-1-B、PY30-1-C、PY34-1-A等气田为煤成烃，恩平组煤系烃源岩的贡献量均大于70%|LH19-5-A、LH19-5-2D、PY30-1-B、PY35-2-A和PY35-2-E等气田主要为海相成因油气，恩平组海相烃源岩的贡献量高达60%~87%|白云凹陷深水区(荔湾地区)LW3-1-B、LW3-1-D、LH34-2-A、LH29-1-A和LH16-2-A等油气田主要为混合成因，但仍以恩平组海相烃源岩为主要贡献，贡献量在60%左右。煤系烃源岩主要分布在白云凹陷的北部陆坡区，而海相烃源岩则主要分布在白云凹陷深水区，海相烃源岩可能是深水区的主力烃源岩。

关键词： 海相烃源岩; 原油成因分类; 油源对比; 混合比例计算; 白云凹陷; 珠江口盆地

本文引用格式

郭玉峰, 杜秀琴, 傅宁 . 珠二坳陷白云凹陷海相烃源岩及其成藏贡献[J]. 天然气地球科学, 2014 , 25(12) : 1975 -1982 . DOI: 10.11764/j.issn.1672-1926.2014.12.1975

Abstract

Marine source rocks within Zhu ⅡSag were defined as the source rocks deposited under the marine-terrestrial transitional facies (Enping Formation and Zhuhai Formation).This kind of source rock,with average TOC of 1.2% and Ⅱ₂ type kerogen,contains mixed organic matters of terrestrial and marine origin,so it has the ability to yield oil and gas.Comprehensive oil-source correlation indicated that light (condensate) oils can be classified to three types:coal-derived oil,marine-soured oil and mixed oil.Mixture contribution of two end members of coal and marine source rock was calculated with mathematic method.It shows that the oil from PY34-1-2,PY30-1-3,PY34-1-1 gas fields in the north slope of Baiyun Sag are predominate from coal measure with its contribution more than 70%|while the oil from LH19-5-1,LH19-5-2D,PY30-1-2,PY35-2-1 and PY35-2-5 gas fields are originated mainly from marine source rocks with its contribution up to 60%-87%|and the oil,from LW3-1-2,LW3-1-4,LH34-2-1,LH29-1-1 and LH16-2-1 wells in deep water zone,Baiyun Sag(Liwan area),are mixture origin but with about 60% from marine source rock.The result indicates that coal measure source rocks are restricted within northern slope area,while marine source rocks distributed in deep water zone of Baiyun Sag are the main contributor within this area.

Key words： Marine source rocks; Oil origin type; Oil source correlation; Mixture proportion calculation; Baiyun Sag; Pearl River Mouth Basin

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