岩性油气藏 ›› 2023, Vol. 35 ›› Issue (3): 18–28.doi: 10.12108/yxyqc.20230302

• 地质勘探 • 上一篇    下一篇

珠江口盆地陆丰13洼转换带中生界陆丰7-9潜山成藏特征

何雁兵, 肖张波, 郑仰帝, 刘君毅, 易浩, 赵庆, 张月霞, 贺勇   

  1. 中海石油 (中国) 有限公司 深圳分公司, 广东 深圳 518054
  • 收稿日期:2022-08-15 修回日期:2022-09-19 发布日期:2023-04-25
  • 作者简介:何雁兵（1986—），男，硕士，工程师，主要从事石油地质综合研究工作。地址：（518054）广东省深圳市南山区后海滨路3168号中海油大厦A座。Email：heyb5@cnooc.com.cn。
  • 基金资助:
    中海油重大生产科研项目 “珠江口盆地 （东部） 浅水区古近系油气成藏条件及勘探突破方向”（编号： SCKY-2020-SZ-21） 资助。

Hydrocarbon accumulation characteristics of Mesozoic Lufeng 7-9 buried hill in Lufeng 13 subsag transition zone，Pearl River Mouth Basin

HE Yanbing, XIAO Zhangbo, ZHENG Yangdi, LIU Junyi, YI Hao, ZHAO Qing, ZHANG Yuexia, HE Yong   

  1. Shenzhen Branch of CNOOC Ltd., Shenzhen 518054, Guangdong, China
  • Received:2022-08-15 Revised:2022-09-19 Published:2023-04-25

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摘要： 珠江口盆地陆丰13洼转换带陆丰7-9潜山丰富的油气显示展现了其较大的勘探潜力。综合测井、录井、井壁取心薄片及地球化学等资料,对珠江口盆地陆丰13洼转换带中生界陆丰7-9潜山的成藏特征进行了研究。研究结果表明:①陆丰13洼发育上文昌组和下文昌组文四段2套优质烃源岩,平均TOC分别为1.54%和2.55%,有机质类型以Ⅱ1型为主。陆丰7-9潜山紧邻优质烃源岩,具有"双源-宽窗"供烃优势。②陆丰7-9潜山圈闭初始发育于中生代白垩纪,定型于古近纪,且高点位置长期稳定,有利于油气的运聚和保存。③陆丰7-9潜山垂向上发育风化带和内幕带,富脆性长英质矿物为潜山储层发育储集空间提供了物质条件,古地貌控制了风化带优质储层的展布,先存断裂持续活化有利于内幕带储层物性的改善。④断裂、不整合面及潜山内部网状裂缝系统共同构成了陆丰7-9潜山主要的油气运移通道,发育"侧源-断裂-不整合面"和"侧源-断裂-网状裂缝"2种供烃模式。⑤陆丰7-9潜山为晚期成藏,原油充注期为0~13 Ma,不同成藏要素之间的时空耦合关系较好,为双洼近源宽窗供烃、断裂-不整合面-网状裂缝联合输导式的晚期成藏模式。

关键词: 风化带, 内幕带, 古地貌, 潜山储层, 近源成藏, 中生界, 陆丰7-9潜山, 陆丰13洼, 珠江口盆地

Abstract: The oil and gas shows of Lufeng 7-9 buried hill in Lufeng 13 subsag transition zone of the Pearl River Mouth Basin show its great exploration potential. Based on the data of drilling，logging，borehole cores，thin sections and geochemistry，the hydrocarbon accumulation characteristics of Mesozoic Lufeng 7-9 buried hill in Lufeng 13 subsag transition zone of Pearl River Mouth Basin were studied. The results show that：（1）Two sets of high-quality source rocks are developed in Lufeng 13 subsag，namely，the upper Wenchang Formation and the fourth member of the lower Wenchang Formation，with the average TOC of 1.54% and 2.55%，respectively，and the organic matter is mainly typeⅡ1. Lufeng 7-9 buried hill is adjacent to high-quality source rocks，with the advantage of double source and wide window hydrocarbon supply.（2）Lufeng 7-9 buried hill trap was initially developed in the Mesozoic Cretaceous，finalized in the Paleogene，and the high point position was stable for a long time，which is conducive to the migration，accumulation and preservation of oil and gas.（3）Weathering zone and inner zone are vertically developed in Lufeng 7-9 buried hill. The brittle felsic minerals are conducive to the development of buried hill reservoirs. The paleogeomorphology controls the distribution of high-quality reservoirs in the weathering zone. The continuous activation of pre-existing faults is conducive to the development of reservoirs in inner zone.（4）The faults，unconformities and internal network fracture system constitute the main oil and gas migration channels of Lufeng 7-9 buried hill，and two hydrocarbon supply models of lateral sourcefault-unconformity and lateral source-fault-network fracture are developed.（5）Lufeng 7-9 buried hill is a late accumulation model with crude oil filling period of 0～13 Ma. The space-time coupling relationship between different accumulation elements is good. It is a late accumulation model of double-sag near-source and wide window hydrocarbon supply， fault-unconformity-network fracture combined transport.

Key words: weathering zone, inner zone, paleogeomorphology, buried hill reservoir, near-source accumulation, Mesozoic, Lufeng 7-9 buried hill, Lufeng 13 subsag, Pearl River Mouth Basin

中图分类号: 

  • TE122.2
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