岩性油气藏 ›› 2017, Vol. 29 ›› Issue (1): 71–80.doi: 10.3969/j.issn.1673-8926.2017.01.009

• 油气地质 • 上一篇    下一篇

查干凹陷下白垩统巴二段储层特征及孔隙演化

吴陈冰洁1,2, 朱筱敏1,2, 魏巍1,2, 蒋飞虎3, 谈明轩1,2, 潘荣1,2   

  1. 1. 中国石油大学(北京)地球科学学院, 北京 102249;
    2. 中国石油大学(北京)油气资源与探测国家重点实验室, 北京 102249;
    3. 中国石化中原油田分公司 石油勘探开发研究院, 河南 濮阳 457001
  • 收稿日期:2016-08-10 修回日期:2016-10-15 出版日期:2017-01-21 发布日期:2017-01-21
  • 通讯作者: 朱筱敏(1960-),男,教授,主要从事沉积储层与层序地层学的教学与研究工作。Email:xmzhu@cup.edu.com。
  • 作者简介:吴陈冰洁(1992-),女,中国石油大学(北京)在读硕士研究生,研究方向为沉积储层与成岩作用。地址:(102249)北京市昌平区府学路18号中国石油大学地球科学学院。Email:656377553@qq.com
  • 基金资助:
    国家油气重大专项项目“岩性地层油气藏沉积体系、储层形成机理与分布研究”（编号:2011zx05001-002）资助

Reservoir characteristics and pore evolution of the second member of the Lower Cretaceous Bayingebi Formation in Chagan Depression

WU-CHEN Bingjie1,2, ZHU Xiaomin1,2, WEI Wei1,2, JIANG Feihu3, TAN Mingxuan1,2, PAN Rong1,2   

  1. 1. College of Geosciences, China University of Petroleum, Beijing 102249, China;
    2. State Key Laboratory of Petroleum Resource and Prospecting, China University of Petroleum, Beijing 102249, China;
    3. Research Institute of Exploration and Development, Sinopec Zhongyuan Oilfield Company, Puyang 457001, Henan, China
  • Received:2016-08-10 Revised:2016-10-15 Online:2017-01-21 Published:2017-01-21

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摘要： 为了研究查干凹陷西部次凹巴二段碎屑岩储层特征，分析成岩作用对孔隙度的影响，根据岩心、薄片观察，以及X 射线衍射、扫描电镜等储层分析测试资料，建立适合研究区的孔隙度演化定量模型，进而对孔隙演化史进行定量恢复。巴二段储层以长石岩屑砂岩为主，具有“两低一高”的特征，储层物性差，以特低—超低孔、特低—超低渗储层为主，孔隙度为0.17%～15.32%，平均为5.7%，渗透率为0.003 7～162.300 0 mD，平均为3.4 mD，储集空间类型主要为粒间溶蚀孔；巴二段储层经历了早期机械压实、早期碳酸盐胶结、碳酸盐溶蚀和晚期碳酸盐胶结等成岩作用，在埋深为2 100～2 800 m 处发育次生孔隙带，现今巴二段大部分处于中成岩A2 期。孔隙度演化定量模型计算结果表明：乌力吉构造带巴二段储层原始孔隙度为30.5%，压实作用减孔（使孔隙度减小）19.8%，胶结-交代作用减孔9.7%，溶蚀作用增孔（使孔隙度增加）3.7%，这在一定程度上改善了储层物性（现今孔隙度约为4.8%）。计算结果与实测孔隙度吻合，建立的模型对孔隙演化过程和优质储层预测具有指导作用。

Abstract: In order to study the characteristics of clastic reservoir and the effects of diagenesis on porosity of the second member of the Lower Cretaceous Bayingebi Formation(K1 b2)in Chagan Depression,a pore evolution model was established based on the data of core,thin section observation,X-ray diffraction and SEM. The reservoir rock of K1 b2 is mainly composed of feldspar lithic sandstone. The reservoir properties are poor,with ultralow porosity and ultra-low permeability. The porosity ranges from 0.17% to 15.32% with an average of 5.7%, and the permeability ranges from 0.003 7 mD to 162.300 0 mD,with an average of 3.4 mD. Intergranular dissolved pores are the main reservoir space. The reservoir of K1 b2 underwent mainly mechanical compaction,early carbonate cementation,carbonate dissolution and late carbonate cementation. Dissolution of carbonate cements, feldspar and rock debris created a secondary pore zone among 2 100-2 800 m,which improves the reservoir properties. The K1 b2 reservoir is mainly at the middle diagenetic A2 stage. The results show that the original porosity of K1 b2 is 30.5% in the Wuliji tectonic zone,compaction reduced the porosity of 19.8%,while the cementation reduced porosity of 9.7%,and the dissolution increased porosity by 3.7%,which improves the reservoir properties( the current porosity is approximately 4.8%). This result matches well with actual porosity,which has a contribution to cognize pore evolution process and predict high quality reservoirs.

中图分类号: 

  • TE343
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