古地理学报 ›› 2014, Vol. 16 ›› Issue (6): 790-801. doi: 10.7605/gdlxb.2014.06.063

• 古地理学及矿产资源 • 上一篇    下一篇

龙门山前缘中三叠统雷口坡组储集层成岩作用差异性

彭靖淞1,刘树根2,张长俊2,张如才1,张江涛1   

  1. 1 中海石油(中国)有限公司天津分公司,天津 300452
    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:2013-11-01 修回日期:2014-05-18 出版日期:2014-12-01 发布日期:2014-12-01
  • 作者简介:彭靖淞,1984年生,2009年毕业于成都理工大学,获硕士学位,现为中海石油(中国)有限公司天津分公司渤海石油研究院勘探地质工程师,主要从事石油地质综合研究工作。通讯地址:天津市塘沽区闸北路1号609信箱;邮编:300452。E-mail: pengjs@cnooc.com.cn。

Study on diagenetic heterogeneity of the Middle Triassic Leikoupo Formation in front area of Longmenshan Mountains

Peng Jingsong1, Liu Shugen2, Zhang Changjun2, Zhang Rucai1, Zhang Jiangtao1   

  1. 1 Tianjin Branch of CNOOC Ltd., Tianjin 300452
    2 State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu 610059, Sichuan
  • Received:2013-11-01 Revised:2014-05-18 Online:2014-12-01 Published:2014-12-01
  • About author:Peng Jingsong,born in 1984,graduated from Chengdu University of Technology in 2009 with his master degree. Now he is an engineer in Tianjin Branch of CNOOC Ltd.,and engaged in petroleum geology research.E-mail: pengjs@cnooc.com.cn

摘要: 随着近年来四川盆地一系列新的碳酸盐岩气田的发现,具有丰富油气资源潜力的川西龙门山前缘逐渐成为寻找高丰度大中型气田的现实地区。针对储集层特征在区内表现出强烈的非均质性,笔者等通过对龙门山前缘中坝地区和天台山大元包地区中三叠统雷口坡组岩心描述和薄片观察,对其成岩作用进行了详细的分析和对比研究。研究表明:(1)龙门山前缘中三叠统雷口坡组储集层成岩作用复杂,其主要成岩作用包括压实压溶作用、胶结作用、溶蚀作用、重结晶作用、藻泥晶化作用、白云石化作用、膏化和硅化作用等;(2)受中三叠世末期龙门山前缘裂陷作用的影响,雷口坡组发育大量的热液构造,包括热液溶蚀、热液矿物的胶结和热液白云石化;(3)受构造高点控制的胶结中断—表生溶蚀是中坝—青林地区储集层优于天台山地区的主要控制因素。龙门山前缘反转之前的构造背景和古地貌决定了雷口坡组成岩作用的差异,从而控制了优质储集层的分布。

关键词: 成岩作用差异, 白云石化作用, 胶结作用, 溶蚀作用, 雷口坡组, 龙门山

Abstract: With a series of new carbonate gas fields discovered in Sichuan Basin,the front area of Longmenshan Mountains in western Sichuan Basin, where has good petroleum potential, is gradually becoming a target area for large- and middle-scale oil and gas fields. Focusing on the reservoir heterogeneity of the Middle Triassic Leikoupo Formation,by means of core description and slice observation, this paper in detail studied the reservoir diagenesis of the Zhongba and Dayuanbao subareas in the front areas of Longmenshan Mountains. The conclusions are:(1)The diagenesis of the Middle Triassic Leikoupo Formation is complicated in the front areas of Longmenshan Mountains. And it mainly includes compaction,pressolution,cementation,gypsification,dissolution,recrystallization,dolomitization,silicafication and so on.(2)The hydrothermal fluids from the deep layer invaded into Leikoupo Formation and resulted in extensive hydrothermal dissolution,cementation and dolomitization,influenced by the rifting activity in the final phase of the Middle Triassic.(3)Cementation interrupting and hypergene dissolution controlled by tectonic high points are the main factors that lead to better reservoirs in Zhongba-Qinling subareas than in Tiantaishan subarea. The tectonic background and palaeogeomorphology before inversion of the front area of Longmenshan Mountains determined the diagenetic heterogeneity of Leikoupo Formation,and controlled the distribution of quality reservoir.

Key words: diagenesis heterogeneity, dolomitization, cementation, dissolution, Leikoupo Formation, Longmenshan Mountains

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