新疆石油地质

›› 2019, Vol. 40 ›› Issue (6): 1-1.doi: 10.7657/XJPG20190605

• 论文 •    

鄂尔多斯盆地东南部长7段页岩气含气量及影响因素

张洪洁1a，王凤琴1a，1b，刘航1a，刘建升2，张雪1a，王海萍1a，王钰婷1a   

  1. (1.西安石油大学 a.地球科学与工程学院;b.陕西省油气成藏地质学重点实验室,西安 710065;2.中国石油 长庆油田分公司 第三采油厂,西安 750001)
  • 出版日期:2019-12-01 发布日期:2019-12-01

Shale Gas Content and Its Influencing Factors in Chang 7 Member of Southeastern Ordos Basin

ZHANG Hongjie1a, WANG Fengqin1a,1b, LIU Hang1a, LIU Jiansheng2, ZHANG Xue1a, WANG Haiping1a, WANG Yuting1a   

  1. (1.Xian Shiyou University, a.School of Earth Sciences and Engineering; b.Key Laboratory of Shaanxi Province for Oil and Gas Accumulation Geology, Xian, Shaanxi 710065, China; 2.No.3 Oil Production Plant, Changqing Oilfield Company, PetroChina, Xian, Shaanxi 750001, China)
  • Online:2019-12-01 Published:2019-12-01

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摘要： 通过经验公式法、等温吸附法、多元线性回归法等方法，对比了鄂尔多斯盆地东南部长7段页岩气不同相态含气量特征，建立了含气量与影响因素之间定性或定量关系，探讨了各相态含气量的主控因素。研究表明，研究区长7段泥页岩吸附气、游离气和溶解气平均含量分别为1.37 m3/t，1.81 m3/t和 0.74 m3/t，吸附气含量由西南向东北方向递减，游离气和溶解气含量由西北向东南方向逐渐递减。总有机碳含量是控制长7段泥页岩吸附气含量的主要因素；矿物质中伊蒙混层对吸附气含量有重要影响；随着有机质成熟度增加，残余液态烃大量出现，吸附气和游离气含量减少，溶解气含量增加；中—大孔的孔隙体积是游离气和溶解气含量的主控因素，砂岩夹层和脆性矿物石英、长石等影响中—大孔占比，进而影响游离气和溶解气含量。

Abstract: By means of empirical formula method, isothermal adsorption method and multiple linear regression method, the paper compares the characteristics of shale gas content in different phase states of Chang 7 member in the southeastern Ordos basin, establishes the qualitative or quantitative relationships between the shale gas content and its influencing factors, and discusses the main controlling factors of the shale gas content in each phase state. The results show that the average contents of adsorbed gas, free gas and dissolved gas in the shale of Chang 7 member in the study area are 1.37 m3/t, 1.81 m3/t and 0.74 m3/t, respectively, the adsorbed gas volume gradually decreases from southwest to northeast, and the contents of free gas and dissolved gas decrease gradually from northwest to southeast. The total organic carbon（TOC） content is the main factor controlling the adsorbed gas content in the shale of Chang 7 member; the mixed layer of illite/ montmorillonite in minerals has an important influence on the content of adsorbed gas; with the increase of organic matter maturity, a large number of residual liquid hydrocarbons appear, the contents of adsorbed gas and free gas decrease, and the content of dissolved gas increases. The medium-large pore volume is the main factor controlling the contents of free gas and dissolved gas. Sandstone intercalation and brittle minerals such as quartz and feldspar affect the proportion of medium-large pores and further influence the contents of free gas and dissolved gas

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