天然气地球科学 ›› 2020, Vol. 31 ›› Issue (3): 393–401.doi: 10.11764/j.issn.1672-1926.2019.12.016

• 非常规天然气 • 上一篇    下一篇

四川盆地焦石坝地区龙马溪组一段上部页岩气层地质特征及开发潜力

舒志恒(),方栋梁,郑爱维,刘超,刘莉,吉婧,梁榜   

  1. 中国石化江汉油田分公司勘探开发研究院,湖北 武汉 430223
  • 收稿日期:2019-08-15 修回日期:2019-12-05 出版日期:2020-03-10 发布日期:2020-03-26
  • 作者简介:舒志恒(1987-),男,湖北汉川人,工程师,硕士,主要从事非常规油气地质综合研究.E-mail:289016702@qq.com.
  • 基金资助:
    国家科技重大专项“涪陵页岩气开发示范工程”(2016ZX05060)

Geological characteristics and development potential of upper shale gas reservoirs of the 1st member of Longmaxi Formation in Jiaoshiba area, Sichuan Basin

Zhi-heng SHU(),Dong-liang FANG,Ai-wei ZHENG,Chao LIU,Li LIU,Jing JI,Bang LIANG   

  1. Research Institute of Exploration and Development,Sinopec Jianghan Oilfield Company,Wuhan 430223,China
  • Received:2019-08-15 Revised:2019-12-05 Online:2020-03-10 Published:2020-03-26
  • Supported by:
    The China National Science and Technology Major Project(2016ZX05060)

摘要:

涪陵页岩气田虽已取得巨大成功,但随着气田开发进入递减期,单井产量逐年递减,因此需寻找新的增产阵地。以四川盆地焦石坝地区龙马溪组一段上部为研究对象,在有机地球化学、全岩X?射线衍射、扫描电镜和岩心观察的基础上进行分析。结果表明,上部气层整体为Ⅱ类页岩储层,具有较优的地质条件。此外通过微地震监测等手段发现,下部气层井压裂形成的有效裂缝大部分未向上延伸至上部气层;上部气层井投产前地层压力比同期邻井的实测地层压力高21.03 MPa,也证实上、下部气层未沟通,上部气层可单独开发。对上部气层评价井进行生产动态分析,计算单井技术可采储量,均达到较高的技术可采储量,具有良好的开发潜力。

关键词: 上部气层, 地质特征, 微地震监测, 开发潜力

Abstract:

Fuling shale gas field has achieved great success, but with the development of the gas field entering the middle and late stages, the production of single well is decreasing year by year, so it is necessary to find new production increasing positions. Based on organic geochemistry, X-ray diffraction, scanning electron microscopy and core observation, the analysis results show that the upper shale gas reservoir belongs to class II shale reservoir, with good geological conditions. In addition, through micro seismic monitoring and other means, most of the effective fractures formed by fracturing of the lower gas reservoir well do not extend upward to the upper gas reservoir; the formation pressure of the upper gas reservoir well before production is 21.03 MPa higher than the measured formation pressure of the adjacent well in the same period, which also proves that the upper and lower gas reservoirs are not connected, and the upper gas reservoir can be developed independently. By analyzing the production performance of the upper gas reservoir evaluation wells and calculating the technical recoverable reserves of a single well, both of them have reached high technical recoverable reserves and have good development potential.

Key words: Upper shale gas reservoirs, Geological characteristics, Microseismic monitoring, Development potential

中图分类号: 

  • TE132.2

图1

焦石坝区块平面位置"

图2

研究区上部气层页岩岩心及镜下特征照片(a)笔石化石发育; (b)粉砂质纹层;(c)纹层镜下特征,粉砂呈纹层状; (d)纹层镜下特征,纹层特征不明显; (e)黏土矿物镜下特征,呈片状; (f)石英颗粒,晶形完整"

图3

研究区上部气层矿物组分交会"

表1

页岩气藏综合地质评价标准[13]"

评价类别脆性评价脆性矿物含量/%

TOC

/%

物性评价孔隙度/%

含气量

/(m3/t)

好(Ⅰ类)>55≥4≥4≥2.5
中(Ⅱ类)40~552~42~41.5~2.5
差(Ⅲ类)<40<2<2<1.5

图4

研究区上部气层孔隙类型(a)纳米—微米级有机质孔隙;(b)黏土矿物晶间孔;(c)粒内溶孔与粒间孔"

图5

焦页A井上部气层孔径分布特征"

图6

焦页A井上部气层孔径分布特征"

图7

焦石坝地区上部气层孔径分布与TOC交会"

表2

上、下部气层地质综合评价参数"

地层厚度/m脆性矿物含量/%TOC/%孔隙度/%

含气量

/(m3/t)

综合评价
亚段小层分类
龙马溪组龙一段三亚段上部气层58.455.71.614.001.07Ⅱ类为主
二亚段
一亚段下部气层40.372.123.976.543.84Ⅰ类为主
五峰组

图8

下部气层井压裂上缝高占比直方图"

图9

上部气层井压裂缝缝高占比直方图"

表3

上部气层井投产前静压与邻井目前压力统计"

上部气层井

上部气层井投产前静压

/MPa

同期老井测压值

/MPa

与老井目前静压差值

/MPa

焦页21-SHF31.287.224.08
焦页29-SHF33.2810.722.58
焦页5-SHF26.49.9716.43
平均值30.329.2921.03

图10

JY5-SHF井生产曲线"

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