地址:四川省成都市高新区天府大道北段12号中国石油科技大厦

电话:028-86015441;028-86015319

邮箱:gaskk@petrochina.com.cn

QQ群:489323588

您所在位置:首页->过刊浏览->天勘2020.3


四川盆地麦地坪组—筇竹寺组沉积充填规律及勘探意义
Sedimentation and filling laws of Maidiping-Qiongzhusi formations in Sichuan Basin and their significance of oil and gas geological exploration
赵立可1 李文皓2 和 源1 周红飞1 刘 冉1 李 亚1 王 尉1  钟 原1 王莹莹3
点击:32次 下载:5次
DOI:
作者单位:1. 中国石油西南油气田公司勘探开发研究院 2. 中国石油西南油气田公司勘探事业部 3. 中国石油川庆钻探工程有限公司地质勘探开发研究院
中文关键字: 烃源岩 沉积旋回划分与对比 裂陷槽 早寒武世 麦地坪组 筇竹寺组 四川盆地
英文关键字:Source rock; Division and correlation of sedimentary cycle; Aulacogen; Early Cambrian; Maidiping Formation; Qiongzhusi Formation; Sichuan Basin.
中文摘要:    为进一步深化四川盆地下寒武统烃源岩的地质认识,弄清烃源岩层的沉积演化过程及天然气成藏规律,重点通过岩性特征、测井响应及地球化学示踪等分析,对下寒武统麦地坪组—筇竹寺组进行沉积旋回序列划分与对比, 揭示烃源岩层系在绵阳—长宁裂陷槽及周缘不同区域的沉积充填规律,并结合各旋回有机碳含量探讨天然气勘探领域。研究结果表明:①裂陷槽区域麦地坪组—筇竹寺组沉积最为完整,典型井如GS17 井、Z4 井自下而上可划分出5 个沉积旋回序列SC1、SC2、SC3、SC4 和SC5,并依次对应于麦地坪组、筇一段、筇二段、筇三段以及筇四段;②裂陷槽周缘台地区域下部地层往往缺失而上部地层保留,典型井如GS1 井、WT1 井仅可识别出最上部的一个筇四段回序列SC5 ;③沉积旋回横向对比发现,麦地坪组与筇竹寺组一段、二段、三段主要分布在裂陷槽内,而筇四段则以广覆式分布为特征,进一步结合筇竹寺组沉积旋回有机质含量特征发现,筇一段至筇三段厚度大且有机碳含量相比最高;筇竹寺组天然气的勘探今后仍需紧紧围绕裂陷槽及周缘展开,且北斜坡将是下一步重点勘探区域。
英文摘要:    In order to deeply recognize the geological conditions of Lower Cambrian source rocks in Sichuan Basin and clarify the sedimentation and evolution process of source rocks and the reservoir-forming laws of related natural gas, the division and correlation of sedimentary cycle sequence were done for the Lower Cambrian Maidiping-Qiongzhusi formations by means of lithologic characteristics, logging response, and geochemical trace. Then, the sedimentation and filling laws of the source rocks surrounding the Mianyang-Changning Aulacogen were revealed. Finally, combined with the organic content of each cycle, several exploration domains were discussed. Results show that, (1) some deposit of Maidiping-Qiongzhusi formations around the aulacogen is the most complete. In many typical wells (e.g. GS17 and Z4 wells), there are five sedimentary cycle sequences determined, including SC1, SC2, SC3, SC4, and SC5 from bottom to top, which respectively correspond to Maidiping Formation and Qiongzhusi 1, 2, 3, and 4 members; (2) around the aulacogen platform, the lower parts are absent while the upper parts are preserved. In other typical wells (e.g. GS1 and GS6 wells), only the uppermost SC5 of Qiongzhusi 4 Member is identified; and (3) the lateral comparison of sedimentary cycles shows that Maidiping Formation and Qiongzhusi 1, 2, and 3 members are mainly distributed in the aulacogen and Qiongzhusi 4 Member is distributed widely. Combined with the organic content in the sedimentary cycles of Qiongzhusi Formation, it is shown that Qiongzhusi 1,2, and 3 members are thick with higher organic content. So, the next gas exploration in Qiongzhusi Formation shall concentrate on the aulacogen and its periphery, and the north slope is also the following important exploration area.

读者评论

      读者ID: 密码:   
我要评论:
国内统一连续出版物号:CN51-1159/TE |国内发行代码: |国际标准出版物号:ISSN1673-3177 |国际发行代码:
主管单位:中国石油西南油气田公司  主办单位:中国石油西南油气田公司勘探开发研究院
版权所有©2020天然气勘探与开发》编辑部 蜀ICP备10004100号
本系统由北京菲斯特诺科技有限公司设计开发
您是本站第3011663名访问者