热带海洋学报 ›› 2017, Vol. 36 ›› Issue (1): 25-34.doi: 10.11978/2016047

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南海深水区白云凹陷烃源岩热演化与油气资源潜力预测*

王柯(), 张功成, 杨海长, 仝志刚, 杨树春   

  1. 中国海洋石油总公司中海油研究总院, 北京100028
  • 收稿日期:2016-05-06 修回日期:2016-06-08 出版日期:2017-01-18 发布日期:2017-01-19
  • 作者简介:

    作者简介:王柯(1987—), 男, 陕西省西安市人, 工程师, 硕士, 主要从事盆地模拟、成油体系与成藏动力学研究。E-mail:wangke6@cnooc.com.cn

  • 基金资助:
    国家科技重大专项“海洋深水区油气勘探关键技术”(2008ZX05025、2011ZX05025);感谢各位同事在文章撰写过程中提供的帮助!感谢审稿专家对本文的修改和建议!

Thermal evolution of source rock and prediction of petroleum resources potential in Baiyun Depression, deep-water area of the northern South China Sea

Ke WANG(), Gongcheng ZHANG, Haizhang YANG, Zhigang TONG, Shuchun YANG   

  1. China National Offshore Oil Corporation Research Institute, Beijing 100028, China
  • Received:2016-05-06 Revised:2016-06-08 Online:2017-01-18 Published:2017-01-19
  • Supported by:
    National Science and Technology Major Projects “Key Techniques in the Deep Ocean Oil and Gas Exploration” (2008ZX05025、2011ZX05025)

摘要:

基于钻井、测井、地震及地质等资料及盆地数值模拟技术, 结合成因法及类比法, 对南海深水区白云凹陷现今地温场特征、烃源岩热演化、烃源岩排烃强度、烃源岩排烃量以及已发现油气田石油、天然气聚集系数进行了系统研究, 进而综合预测白云凹陷油气资源潜力。研究表明, 白云凹陷地温梯度较高, 介于34~67℃·km-1之间, 均值为40℃·km-1, 有利于有机质的成熟与烃类生成; 各烃源岩现今均处于成熟生油或过成熟生气阶段, 烃源岩成熟度从珠海组顶面到文昌组底面增幅较大, 文昌组烃源岩底面过成熟面积占凹陷面积的53.7%; 各烃源岩排气强度均大于排油强度, 且恩平组上段为主力排烃层位; 文昌、恩平及珠海组3套烃源岩总排烃量为1143×108m3油当量。且结合石油、天然气聚集系数预测白云凹陷保守资源量为25.2×108m3油当量。

关键词: 珠江口盆地, 白云凹陷, 烃源岩热演化及排烃量, 聚集系数, 资源潜力

Abstract:

Based on the data of drilling, logging, seismic, geology and basin modeling, we analyzed the characteristics of geothermal, source rock maturation, hydrocarbon expulsion, and accumulation coefficient by using the analogy and genetic methods. Then, prediction of petroleum resources potential in Baiyun depression is carried out. The results show that the Baiyun Depression presents high geothermal gradient, ranging from 34 to 67℃·km-1 and with an average of 40℃·km-1, which is favorable for organic matter maturation and hydrocarbon generation. Each source rock has been in the stage of mature or post mature, and the source rock maturation increases from the top formation of Zhuhai to the bottom formation of Wenchang; the area of post mature is 53.7% in the bottom formation of Wenchang. The strength of gas expulsion is bigger than the strength of oil expulsion, and the upper formation of Enping is the major formation of hydrocarbon expulsion. The hydrocarbon expulsion of three source rocks is 1143×108 m3, and prediction of petroleum resources potential in the Baiyun Depression is 25.2×108 m3 combining the accumulation coefficients of oil and gas.

Key words: Pearl River Mouth Basin, Baiyun Depression, source rock maturation and hydrocarbon expulsion, accumulation coefficient, resource potential