Acta Petrolei Sinica ›› 2022, Vol. 43 ›› Issue (10): 1351-1368,1394.DOI: 10.7623/syxb202210001

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Breakthrough and potential of natural gas exploration in multi-layer system of Penglai gas area in the north of central Sichuan paleo-uplift

Yang Yu1,2, Wen Long1,2, Song Zezhang3, Zhang Benjian1,2, Yan Wei1,2, Zhou Gang1,2, Tian Xingwang1,2, Zhong Yuan1,2, He Yuan1,2, Ma Kui1,2, Li Kunyu1,2, Yang Dailin1,2, Sun Yiting1,2, Ge Bingfei3, Yang Zhenzhong3   

  1. 1. PetroChina Southwest Oil & Gas Field Company, Sichuan Chengdu 610051, China;
    2. Exploration and Development Research Institute, PetroChina Southwest Oil & Gas Field Company, Sichuan Chengdu 610051, China;
    3. State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing 102249, China
  • Received:2022-06-10 Revised:2022-08-17 Online:2022-10-25 Published:2022-11-05

川中古隆起北部蓬莱气区多层系天然气勘探突破与潜力

杨雨1,2, 文龙1,2, 宋泽章3, 张本健1,2, 严威1,2, 周刚1,2, 田兴旺1,2, 钟原1,2, 和源1,2, 马奎1,2, 李堃宇1,2, 杨岱林1,2, 孙奕婷1,2, 葛冰飞3, 杨振中3   

  1. 1. 中国石油西南油气田公司 四川成都 610051;
    2. 中国石油西南油气田公司勘探开发研究院 四川成都 610051;
    3. 中国石油大学(北京)油气资源与探测国家重点实验室 北京 102249
  • 通讯作者: 宋泽章,男,1988年5月生,2016年获俄罗斯国立石油天然气大学博士学位,现为中国石油大学(北京)油气勘探与开发地质系副主任、副教授,主要从事致密储层评价及油气运聚成藏研究工作。Email:songzz@cup.edu.cn
  • 作者简介:杨雨,男,1971年11月生,1996年获成都理工大学硕士学位,现为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工作。Email:yangyu@petrochina.com.cn
  • 基金资助:
    国家科技重大专项"四川盆地二叠系—中三叠统大型气田富集规律与目标评价"(2016ZX05007-004)和中国石油天然气股份有限公司重大科技专项"西南油气田天然气上产300亿立方米关键技术研究与应用"(2016E-06)资助。

Abstract: In recent 3 years, breakthroughs have been made in exploration of Member 2 and 4 of Dengying Formation of Upper Sinian in Sichuan Basin, Member 1 of Canglangpu Formation of Lower Cambrian, and Member 2 of Maokou Formation of Permian in the north slope of the central Sichuan paleo-uplift. After the discovery of Anyue gas area, a new large gas area of trillion cubic meters, namely Penglai gas area, has been formed. Under the joint control of large extensional strike-slip faults, paleo-taphrogenic trough and platform margin zones, multi-layer large-scale source rocks, reservoirs and fault-controlled lithologic traps are vertically developed upwards in Penglai gas area; the good source-reservoir configuration and vertical transport pathways promote the efficient filling of multi-layer oil and gas; the tectonic evolution of "ancient uplift and present slope" ensures the efficient accumulation of oil and gas; the development of direct cap rocks and regional cap rocks in the multilayer system provides good conditions for hydrocarbon preservation. Thanks to the good spatio-temporal collocation of accumulation elements, the Sinian-Permian system in Penglai gas area has formed a unique three-dimensional accumulation model of deep, ultra-deep, multi-layer and marine carbonate rocks in the slope area, i.e., "three-dimensional hydrocarbon supply, three-dimensional reservoir formation, three-dimensional transportation, early oil and late gas, three-dimensional accumulation". The breakthrough in the natural gas exploration in multi-layer system of Penglai gas area can not only greatly expand the exploration of deep and ultra-deep natural gas in Sichuan Basin, but also prove that after multi-period tectonic movements, the ultra-deep and ultra-old strata at the slope of the ancient uplift still have the potential to form large-scale natural gas accumulation, which is of great significance for guiding the further exploration of ultra-deep natural gas in Sichuan Basin.

Key words: ultra-deep layer, three-dimensional accumulation, natural gas exploration, Penglai gas area, central Sichuan paleo-uplift

摘要: 近3年,四川盆地相继在川中古隆起北斜坡上震旦统灯影组二段和四段、下寒武统沧浪铺组一段、二叠系茅口组二段取得勘探突破,继安岳气区发现之后形成了新的万亿立方米级大气区——蓬莱气区。受大型张性走滑断裂、古裂陷槽、台缘带联合控制,蓬莱气区纵向上发育多层系规模化烃源岩、储集层及断控岩性圈闭;良好的"源-储"配置和垂向输导通道促进了多层系油气高效充注;"古隆今斜"的构造演化保证了油气高效汇聚;多层系直接盖层和区域盖层的发育为油气提供了良好的保存条件。得益于成藏要素在时间和空间上的良好配置,蓬莱气区震旦系—二叠系形成了特有的斜坡区深层—超深层、多层系、海相碳酸盐岩立体成藏模式——"立体供烃、立体成储、立体输导、早油晚气、立体成藏"。蓬莱气区多层系天然气勘探突破不仅大大拓宽了四川盆地深层—超深层天然气勘探领域,也证实了在历经多期构造运动后,古隆起斜坡部位的超深、超老地层仍具有形成规模性天然气聚集的潜力,对进一步深化四川盆地超深层天然气勘探具有重要指导意义。

关键词: 超深层, 立体成藏, 天然气勘探, 蓬莱气区, 川中古隆起

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