准噶尔盆地滴西地区石炭系火成岩气藏产能主控因素
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  • 英文篇名:Main controlling factors of productivity of Carboniferous igneous gas reservoirs in Dixi area of Junggar basin
  • 作者:张兆辉 ; 杜社宽 ; 廖建波 ; 陈华勇 ; 于红果
  • 英文作者:ZHANG Zhaohui;DU Shekuan;LIAO Jianbo;CHEN Huayong;YU Hongguo;Key Laboratory of Petroleum Resources, Gansu Province/Key Laboratory of Petroleum Resources Research,Chinese Academy of Sciences;University of Chinese Academy of Sciences;Northwest Branch, Research Institute of Petroleum Exploration and Development,PetroChina;Western Drilling Logging Company,PetroChina;
  • 关键词:产能 ; 影响因素 ; 灰色关联度 ; 火成岩气藏 ; 石炭系 ; 准噶尔盆地
  • 英文关键词:productivity;;influencing factors;;grey relative analysis;;igneous gas reservoirs;;Carboniferous;;Junggar basin
  • 中文刊名:ZGKD
  • 英文刊名:Journal of China University of Mining & Technology
  • 机构:甘肃省油气资源研究重点实验室/中国科学院油气资源研究重点实验室;中国科学院大学;中国石油勘探开发研究院西北分院;中国石油西部钻探测井公司;
  • 出版日期:2018-12-11 14:40
  • 出版单位:中国矿业大学学报
  • 年:2019
  • 期:v.48;No.228
  • 基金:甘肃省自然科学基金项目(17JR5RA313);; 中国科学院油气资源研究重点实验室开放基金项目(KFJJ2016-02);; 甘肃省油气资源研究重点实验室“十三五”科技创新基金项目(135CCJJ20160524)
  • 语种:中文;
  • 页:ZGKD201903014
  • 页数:12
  • CN:03
  • ISSN:32-1152/TD
  • 分类号:141-152
摘要
为了明确影响准噶尔盆地滴西地区石炭系火成岩气藏产能的各个因素并确定主控因素,基于58口探井、评价井86层的试气结果及对应井段的测井解释岩性、裂缝发育,建立了岩性、基质孔隙度、裂缝发育程度以及构造位置等因素与火成岩气藏产能的配置关系,采用灰色关联分析方法,定量分析并确定出火成岩气藏产能影响因素的大小次序为:岩性>裂缝发育程度>基质孔隙度>含气饱和度>单层岩性体厚度>距不整合顶面距离>距主控断裂距离.研究结果表明:储层岩性、基质孔隙度、含气饱和度以及裂缝发育程度、单层岩性体厚度是影响火成岩气藏产能的内在地质因素;压裂改造可以数10倍地提高潜力气藏的产能.火山角砾岩、凝灰岩气藏产能分布在(0.68~9.45)×10~4 m~3范围,随基质孔隙度的增加呈现约1.4倍的增大趋势;酸性侵入岩、基性熔岩气藏产能分布在(1.2~30.2)×10~4 m~3范围,随裂缝层密度、裂缝发育率的增加呈现约3倍的增大趋势;整体上,裂缝发育程度对基性熔岩和酸性侵入岩气藏产能的影响较高于基质孔隙度,而火山角砾岩和凝灰岩气藏与此相反.单层岩性体厚度小于15 m,天然气日产量与厚度关系不大,一般低于5×10~4 m~3;大于15 m,气藏产能均明显增大,其中酸性侵入岩气藏呈现约3.6倍的增大趋势.单层岩性体厚度为扩大有效裂隙的纵向规模奠定了物质基础,与气藏产能呈现正相关.高产气藏在纵向上主要分布在石炭系不整合顶面以下200 m内,且向深部产能逐渐减小;平面上主要分布在断裂发育区及构造高部位,其中DX18井区气藏产能最高,DX17井区次之,DX14井区最低.
        To clarify the factors affecting the productivity of Carboniferous igneous gas reservoirs in Dixi area of Junggar basin and determine the main controlling factors, the relationships between lithology, matrix porosity, fracture development degree, structural location and productivity of igneous gas reservoirs were established based on 86 test results from 58 wells and the logging interpretation among lithology and fracture. On this basis, gray relative analysis methods were used to analyze the affecting factors and obtain the degree order of influencing factors of Carboniferous igneous gas reservoirs. The order of influence from big to little is lithology, fracture development degree, matrix porosity, gas saturation, lithologic body thickness of single layer, distance from unconformity top surface, distance from main controlled fracture. The results show that reservoir lithology, matrix porosity, gas saturation, fracture development degree and lithologic body thickness of single layer are intrinsic geological factors affecting productivity of igneous gas reservoirs, and fracturing can increase the productivity of potential gas reservoirs by more than 10 times. The productivity of volcanic breccia and tuff gas reservoirs ranges from 0.68×10~4 to 9.45×10~4 m~3, and shows a growth relationship about 1.4 times with matrix porosity. The productivity of basic lava and acid intrusive gas reservoirs ranges from 1.2 ×10~4 to 30.2 ×10~4 m~3, and shows a growth relationship about 3 times with fracture layer density and fracture development ration. Overall, the influence of fracture development degree on productivity of basic lava and acid intrusive gas reservoirs is higher than that of matrix porosity, whereas volcanic breccia and tuff gas reservoirs are the opposite. When the thickness of single lithologic body is less than 15 m, the daily production of gas has little relationship with the thickness, and the production is generally less than 5×10~4 m~3. When the thickness of single lithologic body is more than 15 m, the daily production increases obviously, and the acid intrusive rock gas reservoir shows a growth relationship about 3.6 times with thickness of single lithologic body. The single layer thickness of lithologic body lays a material foundation for enlarging the vertical scale of effective fractures and is positively correlated with the gas reservoir productivity. Longitudinally, the gas reservoirs with higher-productivity are mainly distributed within 200 m below the unconformity surface of the Carboniferous, and the productivity of igneous gas reservoirs gradually decreases with the increase of depth. Horizontally, they are mainly distributed in the fault development area and the high position of the structure, among which the productivity of gas reservoir in the DX18 well area is the highest, followed by the DX17 well area and the lowest in the DX14 well area.
引文
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