天然气地球科学

• 非常规天然气 • 上一篇    下一篇

川东北巫溪地区五峰组—龙马溪组页岩气成藏条件与勘探前景

吴伟1,谢军2,石学文1,赵圣贤1,季春海1,胡颖1,郭艳波3   

  1. 1.中国石油西南油气田勘探开发研究院,四川 成都 610043;
    2.中国石油西南油气田公司,四川 成都 610051;3.西南油气田公司重庆气矿,重庆 400021
  • 收稿日期:2016-10-13 修回日期:2017-03-10 出版日期:2017-05-10 发布日期:2017-05-10
  • 作者简介:吴伟(1987-),男,四川南充人,工程师,博士,主要从事天然气地质学与地球化学研究. E-mail:wuwei06@petrochina.com.cn.
  • 基金资助:

    四川省科技厅重大科技专项“四川盆地下古生界页岩气资源评价及选区”(编号:2015SZ0001)资助.

Accumulation condition and exploration potential for Wufeng-Longmaxi shale gas in Wuxi area,northeastern Sichuan Basin

Wu Wei1,Xie Jun2,Shi Xue-wen1,Zhao Sheng-xian1,Ji Chun-hai1,Hu Ying1,Guo Yan-bo3   

  1. 1.Exploration and Development Research Institute,PetroChina Southwest Oil & Gasfield Company,Chengdu 610043,China;
    2.Petrochina Southwest Oil & Gasfield Company,Chengdu 610051,China;
    3.Chongqing Gas Production Division,Southwest Oil and Gasfield Company,Chongqing 400021,China
  • Received:2016-10-13 Revised:2017-03-10 Online:2017-05-10 Published:2017-05-10

摘要:

川东北巫溪地区是四川盆地五峰组—龙马溪组页岩气勘探正在初步探索的新区。通过跟踪,评价巫溪地区最新探井的页岩气相关地质参数,以及页岩储层和含气性特征,页岩气地球化学特征和古生物特征,认为巫溪地区虽然具有良好的页岩气物质基础,但是遭受了非常严重的多期构造破坏。主要表现为乙烷碳同位素明显高于其他成熟度相似区块,以干酪根晚期裂解气为主,反映非常高的排油气效率;巫溪地区页岩孔隙度极低,与构造作用强和滞留油保存少有关;近断裂的页岩甚至出现微弱的变质作用,岩心劈理现象严重,笔石化石表皮遭受热解破坏。综合研究认为巫溪地区页岩气有远景资源,但是现阶段商业开发的可能性极低。

关键词: 页岩气, 碳同位素, 资源评价, 龙马溪组, 笔石, 保存条件

Abstract:

Wufeng-Longmaxi shale gas is a new exploration field in Wuxi area,Sichuan Basin.Some shale gas evaluation-associated geological parameters of the new exploration wells in Wuxi area were studied,including shale reservoir,gas bearing,geochemical and paleontological characteristics.The study suggests that the original shale gas generation condition is excellent,but later this area went through serious and multi-phase tectonic damage.The major evidence presents as:the δ13C2 value of shale gas is obviously higher than others in areas with the same maturity ,indicating the shale gas is mainly late kerogen cracked gas,which is due to a high hydrocarbon expulsion efficiency;the porosity of shale is very low in Wuxi area because of strong tectonic movements and lack of residual oil in shale;some shale core near faults even show a very low metamorphic characteristics with intense cleavage,and the epidermis of graptolite fossils was pyrolyzed.The comprehensive study shows there are prospective resources in Wuxi area,but the possibility to get scaled commercial production in recent time is very low.

Key words: Shale gas, Carbon isotope, Resource evaluation, Longmaxi Formation, Graptolites, Preserve condition

中图分类号: 

  • TE121

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