岩性油气藏 ›› 2022, Vol. 34 ›› Issue (5): 130–138.doi: 10.12108/yxyqc.20220511

• 地质勘探 • 上一篇    下一篇

川中古隆起北斜坡震旦系灯影组二段油气成藏特征

周红飞1,2, 戴鑫1, 贾敏1, 张芮1,2, 李国辉1, 李楠1, 杨强1, 白蓉1   

  1. 1. 中国石油西南油气田分公司 勘探开发研究院, 成都 610051;
    2. 页岩气评价与开采四川省重点实验室, 成都 610021
  • 收稿日期:2021-12-02 修回日期:2022-05-05 出版日期:2022-09-01 发布日期:2022-09-06
  • 作者简介:周红飞(1984-),男,硕士,工程师,主要从事沉积和储层地质方面的研究工作。地址:(610041)四川省成都市高新区天府大道北段12号。Email:zhouhf10@petrochina.com.cn。
  • 基金资助:
    中国石油科技重大专项“西南油气田天然气上产300亿立方米关键技术研究与应用”课题二“四川盆地震旦系—下古生界油气富集规律与目标评价”（编号：2016E-0602）资助

Hydrocarbon accumulation characteristics of the second member of Sinian Dengying Formation in the north slope of central Sichuan paleo-uplift

ZHOU Hongfei1,2, DAI Xin1, JIA Min1, ZHANG Rui1,2, LI Guohui1, LI Nan1, YANG Qiang1, BAI Rong1   

  1. 1. Research Institute of Exploration and Development, PetroChina Southwest Oil & Gas Field Company, Chengdu 610051, China;
    2. Key Laboratory of Gas Evaluation and Exploitation of Sichuan Province, Chengdu 610021, China
  • Received:2021-12-02 Revised:2022-05-05 Online:2022-09-01 Published:2022-09-06

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摘要： 通过岩心精细描述、薄片鉴定、烃源对比、地震相刻画等技术，对川中古隆起北斜坡震旦系灯影组二段油气成藏特征进行了综合研究。研究结果表明：①川中古隆起北斜坡灯二段沉积期主要发育局限台地相和台地边缘相，台缘藻丘相和颗粒滩相均较发育，灯二段储层厚度平均为176.6 m，储地比平均为34.6%，孔隙度平均为4.4%，渗透率平均为3.6 mD，为低孔低渗储层，储层质量整体上优于高磨地区。②研究区震旦系—寒武系成藏条件较好，发育多套烃源岩，具备“上生下储”和“旁生侧储”2种源储配置关系，灯二段天然气主要来源于筇竹寺组烃源岩和深部震旦系烃源岩；③研究区灯二段具备形成构造-岩性气藏和岩性气藏的条件，上倾方向的大型断裂以及岩性致密带的有效封堵是油气成藏及形成不同气水系统的关键；④研究区灯二段储集条件、烃源岩及源储配置关系等成藏条件较高磨地区更加优良，具备形成大气田的地质基础，圈闭资源量已达1.05×1012 m3，具有巨大的勘探潜力，是未来川中古隆起区大气田勘探的重要接替

关键词: 台缘藻丘相, 颗粒滩相, 低孔低渗, 上生下储, 旁生侧储, 灯二段, 震旦系, 北斜坡, 川中古隆起

Abstract: The hydrocarbon accumulation characteristics of the second member of Sinian Dengying Formation (Deng 2 member)in the north slope of central Sichuan paleo-uplift were comprehensively studied by means of fine core description,thin section identification,hydrocarbon source correlation and seismic facies characterization. The results show that:(1)During the depositional period of Deng 2 member,restricted platform facies and platform margin facies are mainly developed in the north slope,with relatively developed platform margin algal mound facies and grain shoal facies. The average values of reservoir thickness,storage-land ratio,porosity and permeability of Dengying 2 member are 176.6 m,34.6%,4.4% and 3.6 mD,respectively. It belongs to low porosity and low permeability reservoir,and the reservoir quality is better than that in Gaomo area as a whole. (2)The Sinian-Cambrian in the north slope have good accumulation conditions,multiple sets of source rocks are developed, with two types of source-reservoir configuration:upper source and lower reservoir,and side source and side reservoir. The natural gas of Dengying 2 member is mainly supplied by source rocks from Qiongzhusi Formation and the deep Sinian source rocks.(3)Deng 2 member in the study area has the conditions for forming structural-lithologic gas reservoirs and lithologic gas reservoirs. The large-scale faults in the updip direction and the effective sealing of lithologic tight zones are the key for hydrocarbon accumulation and formation of different gas water systems. (4)Deng 2 member in the study area has better reservoir conditions,source rocks and source-reservoir configuration than that in Gaomo area,showing the geological basis for forming large gas fields. The amount of trap resources has reached 1.05×1012 m3,with great exploration potential,so it is an important replacement field for large-scale gas field exploration in central Sichuan paleo-uplift.

Key words: platform margin algal mound facies, grain shoal facies, low porosity and low permeability, upper source and lower reservoir, side source and side reservoir, the second member of Dengying Formation, Sinian, north slope, central Sichuan paleo-uplift

中图分类号: 

  • TE122.2
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