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致密气储层随钻孔隙度模型及预测 ——以四川蓬莱地区须家河组为例
Porosity model and forecast while drilling in tight gas reservoirs: An example from Xujiahe Formation, Penglai area, Sichuan Basin
唐 谢 唐家琼 杨 琳 赵 磊 阮 聪
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作者单位: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:碎屑岩 致密气 微钻时 钻时校正 随钻孔隙度 推导 反演计算
英文关键字:Clastic rock; Tight gas; Micro drilling time; Drilling time correction; Porosity while drilling; Derivation; Inversion calculation
中文摘要:    一直以来,四川盆地上三叠统须家河组致密气储层的随钻解释多是采用曲线法或交会法,依据特征曲线的纵向变化或交会特征对储层进行判识。这些方法直观、明确、可操作性强,并能够在钻探过程中及时发现储层、划分储层,为致密气勘探提供快捷、有效的储层识别手段。然而,由于该方法中人为因素较大,无法建立定量化的解释标准,随钻解释仍处于定性—半定量阶段。随着四川盆地须家河组致密气勘探、开发的快速推进,单一的储层识别已无法满足随钻地质评价的需求,需要更具指向意义的随钻解释参数为钻井和导向决策提供更有价值的地质信息,以达到提速增效目的。以微钻时与测井声波的相关性为基础,结合钻速方程推导出工程参数对钻时的校正函数,再通过区域数据反演得到函数关系和关键系数,形成了一种随钻孔隙度定量计算方法。该方法为致密气储层孔隙度定量评价的实现提供一种成本低、效率高、效果好的途径,有力支持致密气随钻评价。
英文摘要:    For most tight gas reservoirs of Upper Triassic Xujiahe Formation, Sichuan Basin, their interpretation while drilling is chiefly carried out by means of curve or intersection methods to identify reservoirs according to some vertical change or intersection of characteristic curve. These methods not only are intuitive, definite, and strongly operable, but also can discover and classify reservoirs in time during drilling, so as to provide fast and effective reservoir identification for tight-gas exploration. However, due to artifacts,
a quantitative interpretation standard has not been established yet, and the interpretation while drilling is still in the qualitative and semi-quantitative stage. Along the exploration and development of tight gas in Upper Triassic Xujiahe Formation of Sichuan Basin advances fast, only reservoir identification method cannot meet the demand of geologic evaluation while drilling. Therefore, more instructive parameters of interpretation while drilling are needed to provide more valuable geological information to make decision in
drilling and steering, and to reach two targets of ROP increase and efficiency improvement. So, a correction function of engineering parameter to drilling time was derived based on one correlation between micro drilling time and log acoustic wave as well as ROP equation. Then, functional relation and key parameters were obtained by means of regional data inversion. Thus, one method to quantitatively calculate porosity while drilling was developed. This porosity-calculating method with low cost, high efficiency, and good
effect may provide powerful support for tight-gas evaluation while drilling.
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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:
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