岩性油气藏 ›› 2016, Vol. 28 ›› Issue (4): 16–23.doi: 10.3969/j.issn.1673-8926.2016.04.003

• 油气地质 • 上一篇    下一篇

四川盆地龙马溪组与大安寨段泥页岩差异性分析

闫建平1,2,崔志鹏2,耿斌3,郭红梅4,李兴文4   

  1. 1.西南石油大学天然气地质四川省重点实验室,成都610500;2.西南石油大学地球科学与技术学院,成都610500;3.中国石化胜利油田分公司勘探开发研究院,山东东营257015;4.中国石油集团测井有限公司长庆事业部,西安710201
  • 出版日期:2016-07-20 发布日期:2016-07-20
  • 作者简介:闫建平(1980-),男,博士,副教授,主要从事测井地质学、岩石物理及非常规储层测井评价方面的教学和研究工作。地址:(610500)四川省成都市新都区西南石油大学地球科学与技术学院。E-mail:yanjp_tj@163.com。
  • 基金资助:

    国家自然科学基金项目“页岩气储层微观结构及岩石物理响应数值模拟研究”(编号:41202110)、天然气地质四川省重点实验室开放课题基金项目“湖相泥页岩地层岩相测井定量识别方法研究”(编号:2015trqdz07)和四川省应用基础研究计划项目“泥页岩地层周期及高分辨率沉积旋回测井识别研究”(编号:2015JY0200)联合资助

Differences of shale between Longmaxi Formation and Da’anzhai member in Sichuan Basin

Yan Jianping 1,2,Cui Zhipeng2,Geng Bin3,Guo Hongmei4,Li Xingwen4   

  1. 1. Sichuan Key Laboratory of Natural Gas Geology,Southwest Petroleum University,Chengdu 610500,China;2. School of Geoscience and Technology,Southwest Petroleum University,Chengdu 610500,China;3. Research Institute of Exploration and Development,Sinopec Shengli Oilfield Company,Dongying 257015, Shandong,China;4. Changqing Division,CNPC Logging Company,Xi’an 710201,China
  • Online:2016-07-20 Published:2016-07-20

摘要:

陆相泥页岩油气勘探已引起越来越多的关注。选取我国四川盆地下侏罗统自流井组大安寨段陆相泥页岩与已经初步实现规模化商业性生产的下志留统龙马溪组海相泥页岩进行类比,分析二者在发育层位、岩石类型、岩石组分、有机质地球化学特征及储集物性等方面的差异性,以便建立一套适用于四川盆地陆相页岩气勘探开发的评价标准。研究表明:龙马溪组埋藏深度一般为2 000~4 000 m,主要发育黑色硅质页岩、硅质岩、炭质页岩和深灰色泥岩等,具有纹层状构造,泥页岩矿物成分主要为石英、碳酸盐矿物、黏土矿物、白云母和黄铁矿等,TOC 质量分数主要为1%~4%,Ro 一般为2.4%~3.6%,处于高—过成熟生气阶段,有机质类型以Ⅰ型为主,晶间孔、粒间孔和微裂缝发育,构造保存条件较好;大安寨段埋藏深度主要为1 400~4 300 m,发育暗色泥页岩,且以暗色泥页岩夹薄层介壳灰岩或二者互层为特征,泥页岩页理发育,具有纹层状构造,矿物成分主要为石英、长石、黏土矿物、方解石、白云石及黄铁矿等,TOC 质量分数主要为0.58%~3.81%,Ro 为1.05%~1.85%,处于成熟—高成熟生气阶段,有机质类型以Ⅱ2 型为主,主要发育粒间孔、晶间孔、生物体腔孔、溶蚀孔和裂缝,具有裂缝型介壳灰岩油气藏或孔隙-裂缝型含有机质介壳灰岩油气藏与页岩气藏共存的特征。综合研究认为,与龙马溪组相比,大安寨段也具有较大的页岩气资源潜力和较好的勘探开发前景。

Abstract:

The exploration of nonmarine shale oil and gas gets more and more attention. This paper selected nonmarine shale in Da’anzhai member of Lower Jurassic Ziliujing Formation in Sichuan Basin to conduct comparison with marine shale in Lower Silurian Longmaxi Formation which has gained achievements of preliminary scale production,and then analyzed their differences in strata,rock types,rock fabric,organic geochemical characteristics and physical properties of shale reservoir, so as to establish an evaluation standard for nonmarine shale gas exploration and development in Sichuan Basin. The results show that the buried depth of Longmaxi Formation is generally 2 000?4 000 m, where black siliceous shale, chert, carbonaceous shale and dark gray mudstone are mainly developed, with lamellar structure, and the main minerals of shale are quartz, carbonate minerals, clay minerals, muscovite and pyrite. With higher content of organic matters, Longmaxi shale contains 1%-4% of TOC, with Ro of 2.4%-3.6%, being at the high-over mature stage of gas generation, and dominated by type Ⅰ-kerogen, it mainly developed intergranular pores, intracrystalline pores and microfissure. In addition, the tectonic preservation conditions are good. The buried depth of Da’anzhai member is generally 1 400-4 300 m, where dark shale is mainly developed. Characterized by dark shale with thin coquina or both interbedded, the shale developed lamellation with lamellar structure, and the main minerals are quartz, feldspar, clay minerals, calcite, dolomite and pyrite. The shale in Da’anzhai member contains 0.58%-3.81% of TOC, with Ro of 1.05%-1.85%, being at mature?high mature stage, and dominated by type Ⅱ2 -kerogen, it mainly developed intergranular pores, intracrystalline pores, organism pores, dissolved pores and fissures. Da’anzhai member has features of the coexistence of fractured coquina reservoirs or pore?micro fractured reservoir containing organic coquina with shale gas reservoir. It is considered that compared with Longmaxi Formation, the Da’anzhai member in Sichuan Basin also has a large shale gas resource potential and good prospects for exploration and development.

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