海相油气地质2013，Vol.18Issue(3)：29-38,10.DOI:10.3969/j.issn.1672-9854.2013.03.004
川北仪陇—平昌地区雷口坡组顶部古岩溶的识别及其与储层的关系
Recognition and Potential Zones of Paleokarst at the Top of Middle Triassic Leikoupo Reservoir in Yilong-Pingchang Area,Northern Sichuan Basin
李浩 1王兴志 2胡杨 3朱童 4李顺 5杨雪飞2
作者信息
- 1. 中海石油(中国)有限公司天津分公司勘探开发研究院
- 2. 西南石油大学资源与环境学院
- 3. 川庆钻探工程公司地质勘探开发研究院
- 4. 成都理工大学能源学院
- 5. 中国石油西南油气田分公司
- 折叠
摘要
Abstract
The Middle Triassic Leikoupo carbonate rock is divided in five members (from T2l1 to T2l5) in YilongPingchang Area,Northem Sichuan Basin.The Leikoupo 5th Member has been denudated up and at the top of Leikoupo 4th Member (T2l4) is directly unconformably overlied by Xujiahe Formation (T3x).The residual thickness of leikoupo Fm.is from 800m to 950m.Extensive dissolution had been undergone in a range of over then to a hundred meters at the top of T2l4 Member,which resulted in epidiagentic karstification and formed karst breccia,silicification and dissolved ditches,holes,caves and fractures.Contributed to the karstification,a large amounts of dissolution space was produced,in which parts of dissolution space were rilled all or locally with argillaceous material that had fallen from the overlying T3x.Acording to the analysis of imaging logging and well cores,it is shown that three karst zones develop,including vertical seepage flow,horizontal underflow and deep slow flowage zones.Overall,the development of the reservoir with the vertical seepage flow zone is better than that with the horizontal underflow zone and the development of the reservoir with slow flowage zone is poor.Besides,the karstification is more extensive and reservoir property is better in higher location.Based on the map of the drawing energy storage coefficient(ESC) distribution of T2l4,it is suggested that the areas of Well A21-Well A19,Well A22-Well A23 and Well A160,in which the ESC are all great than 0.6,are the potential reservoir areas.关键词
四川盆地北部/雷口坡组/岩溶储层/储层特征Key words
Sichuan Basin/ Middle Triassic/ Leikoupo Fm./ Karst reservoir/ Reservoir characteristics分类
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李浩,王兴志,胡杨,朱童,李顺,杨雪飞..川北仪陇—平昌地区雷口坡组顶部古岩溶的识别及其与储层的关系[J].海相油气地质,2013,18(3):29-38,10.
