石油与天然气地质 ›› 2024, Vol. 45 ›› Issue (1): 200-214.doi: 10.11743/ogg20240114

• 油气地质 • 上一篇    

四川盆地蓬莱气区震旦系灯影组二段岩溶古地貌与控储模式

张自力1(), 乔艳萍1, 豆霜1, 李堃宇1(), 钟原1, 武鲁亚1, 张宝收1, 戴鑫1, 金鑫2, 王斌2, 宋金民2   

  1. 1.中国石油 西南油气田分公司 勘探开发研究院,四川 成都 610041
    2.油气藏地质及开发工程国家重点实验室(成都理工大学),四川 成都 610059
  • 收稿日期:2023-09-02 修回日期:2023-12-07 出版日期:2024-02-01 发布日期:2024-02-29
  • 通讯作者: 李堃宇 E-mail:zzl_kyy@petrochina.com.cn;likunyu2018@petrochina.com.cn
  • 第一作者简介:张自力(1986—),男,博士、高级工程师,沉积盆地分析与油气地质。E-mail: zzl_kyy@petrochina.com.cn
  • 基金项目:
    中国石油天然气股份有限公司科学研究与技术开发项目(2021DJ0501);中国石油天然气股份有限公司重大科技专项(2023ZZ16YJ01)

Karst paleogeomorphology and reservoir control model of the 2nd member of Dengying Formation in Penglai gas area, Sichuan Basin, China

Zhili ZHANG1(), Yanping QIAO1, Shuang DOU1, Kunyu LI1(), Yuan ZHONG1, Luya WU1, Baoshou ZHANG1, Xin Dai1, Xin JIN2, Bin WANG2, Jinmin SONG2   

  1. 1.Research Institute of Exploration and Development,Southwest Oil & Gas Field Company,PetroChina,Chengdu,Sichuan 610041,China
    2.State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Chengdu University of Technology,Chengdu,Sichuan 610059,China
  • Received:2023-09-02 Revised:2023-12-07 Online:2024-02-01 Published:2024-02-29
  • Contact: Kunyu LI E-mail:zzl_kyy@petrochina.com.cn;likunyu2018@petrochina.com.cn

摘要:

基于钻井岩心描述、薄片鉴定、测井资料以及三维地震资料,对四川盆地蓬莱气区震旦系灯影组二段(灯二段)表生岩溶古地貌与储层发育规律进行系统研究。结果表明:①蓬莱气区灯二段垂向上可划分为地表岩溶带、垂直渗流带、叠合带、水平潜流带和深部缓流带,其中水平潜流带发育储层厚度最大。②采用双界面法恢复了蓬莱气区灯二段岩溶古地貌,划分为4个一级古地貌单元:岩溶高地、岩溶斜坡、岩溶洼地和岩溶盆地,整体表现为“一高、一斜、两洼”的古地貌特征。③东部高石梯—磨溪地区为岩溶高地,中部发育岩溶斜坡,西北侧及西南侧为岩溶洼地。岩溶高地主要发育垂直渗流带,岩溶斜坡主要发育水平潜流带。蓬莱气区灯二段储层的发育由岩溶古地貌与沉积相联合控制。④表生岩溶储层是四川盆地蓬莱气区灯二段的主要储层类型,岩溶斜坡叠合丘滩体微相形成了优质储层。

关键词: 表生岩溶, 岩溶分带, 岩溶古地貌, 灯二段, 震旦系, 蓬莱气区, 四川盆地

Abstract:

An integration of core and thin section observation, log and 3D seismic data is applied to systematically analyze the epigenetic karst paleogeomorphology and reservoir development pattern of the 2nd member of the Dengying Formation (hereafter referred to as Deng 2 Member) in the Penglai gas area, Sichuan Basin, China. Key findings are summarized as follows. First, the Deng 2 Member in the Penglai gas area can be vertically divided into the epigenetic karst zone, vertical vadose zone, superimposed zone, horizontal phreatic zone, and deep tranquil flow zone. Notably, the horizontal phreatic zone exhibits the thickest reservoirs; second, the karst paleogeomorphology of the Deng 2 Member was restored using the dual interface method. The results indicate that it can be categorized into four types of first-order paleogeomorphic units, namely karst highland, karst slope, karst depression, and karst basin, exhibiting one karst highland, one karst slope, and two karst depressions overall; third, the karst highland is situated in the Gaoshiti-Moxi area in the east, the karst slope is present in the central part of the study area, and the karst depressions are found on the northwest and southwest sides of the study area. The karst highland and karst slope primarily contain vertical vadose zones and horizontal phreatic zones, respectively. It is proposed that reservoirs in the Deng 2 Member of the Penglai gas area are jointly influenced by karst paleogeomorphology and sedimentary facies; fourth, epigenetic karst reservoirs emerge as the predominant reservoir type in the study area, with high-quality reservoirs occurring in the karst slope with superimposed microfacies of mound-shoal complexes.

Key words: epigenetic karst, karst zonation, karst paleogeomorphology, Deng 2 Member, Sinian, Penglai gas area, Sichuan Basin

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