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

        028-86015324

        028-86015319


邮箱:gaskk@petrochina.com.cn

QQ群:489323588

您所在位置:首页->过刊浏览->天勘2016.4


沁南盆地成庄区块高煤阶煤层气高产主控因素
Main Factors Influencing High Yield of High-Rank CBM in Chengzhuang Block, Southern Qinshui Basin
杨克兵 王海潮 王君 陈辉娜 符康
点击:705次 下载:7次
DOI:
作者单位:中国石油华北油田公司勘探开发研究院
中文关键字:沁南盆地 高煤阶煤层气 高产井 主控因素 排烃期 封堵条件
英文关键字:Southern Qishui Basin, high-rank CBM, high-productivity well, main influencing factor, duration of hydrocarbon discharge, plugging condition
中文摘要:我国聚煤盆地形成演化历史复杂,后期构造破坏严重,而高煤级煤储层更是多阶段演化和多热源叠加变质作用明显,使得煤层气储层物性具有极强的非均质性,单井产量普遍较低,煤层气开采难度大。已有研究成果主要对构造、沉积、水动力等控气作用进行了分析,不能有效解决生产中存在的煤层气探明率低、产能到位率低等难题。以华北油田南煤层气田成区块高产井的动、静态资料为基础,结合南气田其他区块的开发特点,对高产共性特征进行分析,认为煤储层微裂隙发育、渗透率高是煤储层高产的主要原因,煤储层富含游离气也是高产的重要原因,其他如厚度、含气量、构造运动、水动力等为局部影响因素。进一步研究发现:成区块煤层气属于沉积气,煤层排烃时期的煤储层封堵条件是煤层气井高产的主控因素。当煤层封堵条件好时,既有助于改善煤储层的物性,又使得煤储层富含游离气,为气藏的高产提供了物质基础。该观点的提出,不仅为煤层气高产区块选区评价提供了地质依据,而且对致密油气藏的甜点区评价也具有参考意义。

 

英文摘要: 

In China, most coal-accumulating basins went through complex evolution history and some structures formed in the late period were severely damaged. And lots of high-rank coal reservoirs also underwent multiple-stage tectonic evolution and obvious metamorphism, resulting in strong heterogeneity, and low yield of coalbed methane (CBM) or difficulty in its exploitation. Even though previous research focused on the analysis on such factors as structure, deposition, and hydrodynamics, many problems including low proven rate and low utilization rate of production capacity have not been solved very effectively. So, according to some dynamic and static data from high-productivity wells in Chengzhuang block, Southern Qinshui Basin, combining with development characteristics of surrounding blocks, we analyzed common features of these kinds of wells. Results show that (1) the main factors influencing high yield are developed microfractures and high permeability in coal reservoirs; (2) another important factor is rich free gas in these reservoirs; and (3) there are other factors including reservoir thickness, gas content, tectonic movement, and hydrodynamics. Our study also demonstrates that CBM in Chengzhuang block is controlled by sedimentation, and plugging condition during hydrocarbon discharge is the key factor influencing high productivity. Good plugging condition is conducive to improving petrophysical property and generating more free gas, which can provide material foundation for high yield. This viewpoint presented gives geologic evidence for optimizing high-yield blocks, and is significant for evaluating sweetspot of tight reservoirs.

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©2017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1455166名访问者