石油勘探与开发 >

2022 , Vol. 49 >Issue 2: 238 - 248

DOI: https://doi.org/10.11698/PED.2022.02.03

油气勘探

扬子克拉通西北缘震旦系油气成藏条件及勘探潜力

  • 杨雨 ,
  • 汪泽成 ,
  • 文龙 ,
  • 谢武仁 ,
  • 付小东 ,
  • 李文正
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  • 1.中国石油西南油气田公司,成都 610051;
    2.中国石油勘探开发研究院,北京 100083
杨雨（1971-）,男,重庆人,硕士,中国石油西南油气田公司高级工程师,主要从事油气勘探与综合研究。地址：四川省成都市府青路一段3号, 中国石油西南油气田公司, 邮政编码：610051。E-mail:yangyu@petrochina.com.cn

收稿日期: 2022-01-14

  网络出版日期: 2022-03-16

基金资助

中国石油天然气股份有限公司前瞻性与基础性重大科技项目“不同类型大气田（区）成藏主控因素及领域评价”（2021DJ0605）

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Sinian hydrocarbon accumulation conditions and exploration potential at the northwest margin of the Yangtze region, China

  • YANG Yu ,
  • WANG Zecheng ,
  • WEN Long ,
  • XIE Wuren ,
  • FU Xiaodong ,
  • LI Wenzheng
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  • 1. PetroChina Southwest Oil & Gas Field Company, Chengdu 610051, China;
    2. PetroChina Research Institute of Petroleum Exploration & Development, Beijing 100083, China

Received date: 2022-01-14

  Online published: 2022-03-16

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摘要

基于露头、钻井、测井和地震资料,对扬子克拉通西北缘超深层震旦系灯影组成藏条件、成藏模式与勘探潜力进行系统研究。结果表明：①扬子克拉通西北缘震旦纪—早寒武世早期为克拉通裂陷阶段,表现为同沉积断裂发育与裂陷快速沉降,沉积分异显著,裂陷两侧灯影组发育大型台缘带;②震旦系—寒武系发育陡山沱组与麦地坪组—筇竹寺组两套优质烃源岩,其中后者厚度为150~600 m,生烃强度为（100~200）×108 m3/km2;③震旦系灯影组断控台缘带丘滩体厚度大且成排成带分布,受同生期—准同生期和表生期岩溶作用叠加改造,形成厚度为200~400 m的孔洞型储集层;④两套烃源岩主生油期在二叠纪—早三叠世,石油近距离运移至灯影组丘滩体岩性圈闭中聚集形成规模巨大的古油藏群;晚三叠世—侏罗纪古油藏裂解成气,奠定现今天然气藏基础;⑤灯影组台缘带丘滩体与两套优质烃源岩形成多种有利源储配置关系,具备近源高效成藏的条件,可形成大型岩性气藏群。绵阳—剑阁地区是潜在的万亿立方米储量规模大气区,位于该区域的老关庙构造灯影组二段丘滩体面积约1 300 km2,是近期超深层勘探值得探索的目标。

关键词： 克拉通裂陷; 灯影组; 烃源岩; 断控型台缘带; 岩性油气藏; 扬子克拉通西北缘

本文引用格式

杨雨 , 汪泽成 , 文龙 , 谢武仁 , 付小东 , 李文正 . 扬子克拉通西北缘震旦系油气成藏条件及勘探潜力[J]. 石油勘探与开发, 2022 , 49(2) : 238 -248 . DOI: 10.11698/PED.2022.02.03

Abstract

Based on outcrop, drilling, logging and seismic data, the reservoir forming conditions, reservoir forming model and exploration potential of the ultra-deep Sinian Dengying Formation at the northwest margin of Yangtze region were examined. (1) This area is in craton rifting stage from Sinian to Early Cambrian, characterized by syn-sedimentary faults and rapid subsidence, significant sedimentary differences, and development of Dengying Formation platform margins on both sides of the rift. (2) The Sinian-Cambrian in this area has two sets of high-quality source rocks, Doushantuo Formation and Maidiping-Qiongzhusi Formation; of which, the latter has a thickness of 150-600 m and hydrocarbon generation intensity of (100-200)×108 m3/km2. (3) The mounds and shoals in the platform margin of Sinian Dengying Formation controlled by faults are thick and distributed in rows and zones; they are reformed by contemporaneous-quasi-contemporaneous and supergene karstification jointly, they become pore-type reservoir with a thickness of 200-400 m. (4) The two sets of source rocks enter oil generation windows from Permian to Early Triassic, and the oil migrates a short distance to the lithologic traps of mounds and shoals to form a huge scale paleo-oil reservoir group; from Late Triassic to Jurassic, the oil in the paleo-oil reservoirs is cracked into gas, laying the foundation of present natural gas reservoirs. (5) The mound-shoal body at the platform margin of Dengying Formation and the two sets of high-quality source rocks combine into several types of favorable source-reservoir combinations, which, with the advantage of near source rock, can form large lithologic gas reservoirs. The Mianyang-Jiange area is a potential large gas field with trillion cubic meters of reserves. According to seismic prediction, the Laoguanmiao structure in this area has the Deng-2 Member mound-shoal reservoir of about 1300 km2, making it a ultra-deep target worthy of exploration in the near future.

Key words： craton rift; Dengying Formation; source rock; fault-controlled platform margin belt; lithologic petroleum reservoir; northwest margin of Yangtze region

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