Shale petrophysical evaluation of the Middle Jurassic Dameigou Formation in Chaiye1 Well, Qaidam Basin
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摘要:
页岩储层测井评价是后期压裂改造工程的基础, 通过分析柴页1井常规测井曲线特征, 结合特殊测井和岩心样品分析化验数据, 综合评价了中侏罗统大煤沟组页岩岩性、物性、地球化学、含气性、可压裂性等特征, 获得了储层评价及工程改造参数。柴页1井中侏罗统大煤沟组至少发育128.1m厚的富有机质页岩, 具有高伽马、高声波时差、高中子、高电阻、低密度的特点; 测井计算有利的富有机质页岩的总有机碳含量介于3.20%~4.20%之间, 总含气量介于1.50~4.50m3/t之间, 有利页岩层段脆性矿物含量介于45%~75%之间, 划分出3个有利层组, 第Ⅰ层组和第Ⅱ层组具有杨氏模量高、泊松比低的特点, 有利于后期射孔压裂
Abstract:Petrophysical evaluation of shale reservoirs is the basis of the fracturing project. The drilling project of Chaiye1 well was organized by China Geological Survey in 2013. The results of conventional logging and element capture spectroscopy of Chaiye1 well provided data for shale gas exploration and development of Qaidam Basin. Based on the open hole logging data, core analysis data, lithology, physical properties, geochemical characteristics, gas-bearing properties and geomechanics, this paper has summarized reservoir evaluation and fracturing characteristics. The organic-rich shale with high gamma, high acoustic, high neutron, high resistivity, low density features at least has the thickness of 128.1m, the total organic carbon content is between 3.20% and 4.20%, the total gas content is between 1.50~4.50m3/t, and the brittle mineral content is between 45% and 76%, as shown by the result of petrophysical evaluation. In addition, three potential layers are recognized in Chaiye1 well, with the shale inⅠandⅡintervals characterized by high Young's modulus and low Poisson's ratio being most favorable for perforation optimization design.
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Keywords:
- Middle Jurassic /
- shale gas /
- logging /
- fracturing
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致谢: 成文过程中得到中国地质调查局油气资源调查中心翟刚毅教授级高工、中国地质调查局总工程师室任收麦研究员的指导，数据处理解释过程中得到斯伦贝谢中国公司吴丽艳博士的帮助，在此深表感谢。
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图 3 柴页1井中侏罗统大煤沟组页岩Tmax-HI和Tmax-PC/TOC划分类型图
Tmax—岩石热解最高峰温度；HI—烃源岩氢指数；PC/TOC—降解率
Figure 3. HI-Tmax and PC/TOC-Tmax partition type of shale in the Middle Jurassic Dameigou Formation
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图 4 柴页1井页岩气有利层段测井曲线划分
Figure 4. Favorable intervals from logging curves in Chaiye1 well
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图 5 柴页1井页岩气有利层段元素及矿物成分
Figure 5. Element and mineral composition of favorable intervals in Chaiye1 well
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图 7 柴页1井有利层段页岩孔隙度分布
Figure 7. Porosity of rich organic shale in favorable intervals of Chaiye1 well
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图 8 柴页1井测井计算含气量与现场解吸含气量对比
Figure 8. Gas content from logging evaluation and desorption measurement of Chaiye1 well
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图 9 柴页1井页岩气层段TOC和含气量分析统计
Figure 9. Statistical diagram of total organic carbon content and gas content in Chaiye1 well
表 1 不同类型含气页岩储层综合对比
Table 1 Comprehensive correlation of different gas-bearing shale reservoirs
类別/地区 四川盆地东部 鄂尔多斯盆地 柴达木盆地北缘 地层特征 目的层位 志留系龙马溪组一奥陶系五峰组 石炭系一二叠系本溪组、太原组、山西组 中侏罗统大煤沟组 储层深度/m 2500~3500 2400~3300 1950~2110 压力系数 1.55 0.83~0.95 0.94 沉积环境 海相 海陆交互相 陆相 地层温度/℃ 99.4 86 55 夹层特征 少或无 夹较多砂岩、灰岩和煤层 夹较多砂岩和煤层 储层特征 岩性 为灰黑色炭质笔石页岩 喑色泥页岩夹灰岩和煤层 黑色、灰黑色炭质泥岩为主，夹白色中砂岩和煤层 孔隙度 1.17%~8.61%, 平均4.9% 1.0%~4.0% 2.0%~8.0%, 平均3.7% 渗透率 0.002~335.2, 平均1.17 0.007~4.84, 平均0.89 多数样品小于0.05mD 脆性矿物 37.2%~83.4%, 平均59.1% 46.51-54.04% 多介于45%~70% 裂缝发育 不发育，多见水平层理 较少 有微裂缝 烃源岩 有机质类型 Ⅰ型 Ⅰ~Ⅲ型 Ⅱ型 TOC 0.55%~7.13%, 平均2.65% 1.00%~5.00%, 平均2.80% 1.00%~9.30%, 平均6.45% Ro 2.20%~2.58%, 平均2.48% 1.10%~2.50% 0.45%~1.23% 
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表 2 柴页1井部分样品渗透率分析结果
Table 2 Permeability of shale in Chaiye1 well
序号 深度/m 空气渗透率/10-3μm2 岩石密度/(g.cm-3) 1 1932.84 < 0.05 2.904 2 1933.79 0.032 3.083 3 1935.69 < 0.05 3.066 4 1936.69 < 0.05 3.047 5 1940.14 < 0.05 2.970 6 1942.69 < 0.05 3.334 7 1943.49 < 0.05 3.214 8 1944.6 < 0.05 2.790 9 1950.5 < 0.05 3.027 10 1958.8 0.22 3.135 11 1989.7 0.56 2.648 12 1996.6 < 0.05 2.602 13 2030.93 0.0047 3.34
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