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现代地质 ›› 2017, Vol. 31 ›› Issue (03): 565-573.

• 能源地质 • 上一篇    下一篇

鄂尔多斯盆地苏77、召51区块山23段储层成岩作用与孔隙演化定量分析

王晓晨1(), 罗静兰1, 李文厚1, 王若谷2, 唐启银3   

  1. 1.西北大学地质学系 大陆动力学国家重点实验室,陕西 西安 710069
    2.陕西延长石油(集团) 有限责任公司 研究院,陕西 西安 710075
    3.中国石油青海油田分公司 采油二厂,甘肃 敦煌 736202
  • 收稿日期:2016-08-29 修回日期:2017-03-26 出版日期:2017-06-10 发布日期:2017-06-27
  • 作者简介:王晓晨,男,博士研究生,1989年出生,矿产普查与勘探专业,主要从事沉积学及储层地质学研究。Email:wxc_3134@sina.com
  • 基金资助:
    国家自然科学重点基金项目(41330315);中国地质调查局地质调查计划项目(12120114009201)

Diagenesis Characteristics and Quantitative Analysis of Porosity Evolution of Reservoir of Shan23 Formation in Su77-Zhao51 Well Region,Ordos Basin

WANG Xiaochen1(), LUO Jinglan1, LI Wenhou1, WANG Ruogu2, TANG Qiyin3   

  1. 1. Department of Geology, Northwest University, State Key Laboratory of Continental Dynamics, Xi’an,Shaanxi 710069,China
    2. Research Institute of Yanchang Petroleum(Group)Co.Ltd., Xi’an,Shaanxi 710075,China
    3. The Second Oil Recovery Plant of Qinghai Oilfield Branch,PetroChina, Dunhuang,Gansu 736202,China
  • Received:2016-08-29 Revised:2017-03-26 Online:2017-06-10 Published:2017-06-27

摘要:

利用扫描电镜、岩石薄片、高压压汞、X衍射等实验及物性分析资料,对鄂尔多斯盆地苏77、召51区块山23段储层基本特征、成岩作用类型及强度、孔隙演化模式进行研究。结果表明:储层主要岩石类型为成分成熟度较高、结构成熟度较低的石英砂岩和岩屑石英砂岩;孔隙类型以溶孔为主,残余粒间孔和晶间孔含量次之。储层在经历中等-强程度的压实,中等程度的胶结以及强烈的溶蚀作用后,处于中成岩阶段B期,局部处于晚成岩阶段。压实作用和胶结作用导致原生孔隙遭到破坏,孔隙度损失分别为16.94%和14.29%,晶间孔和溶蚀作用分别使孔隙度增加0.92%和5.64%,储层物性得以改善。孔隙空间经历原生孔隙减少→次生孔隙发育→次生孔隙减少→混合孔隙并存的复杂演化过程。

关键词: 苏77—召51区块, 23段, 成岩作用, 孔隙演化

Abstract:

Taking advantage of the experiment of scanning electron microscopy,the casting thin section,high pressure Hg injection,X-ray diffraction and physical properties,this paper have studied the reservoir essential characteristics,including diagenesis types and intensity,porosity evolution of Shan23 Formation in Su77-Zhao51 well region in the Ordos Basin.The results show that there are mainly two rock types,i.e.quartz sandstone and lithic quartz sandstone,both of which have high compositional maturity and low structural maturity.In addition, the pore type is mainly dissolution pore,while the residual intergranular pore and intercrystalline pore take the second place.After undergoing moderate-strong degree compaction,moderate cementation and strong dissolution,the reservoir is now in the phase B of the middle diagenetic stage,part of which is in the late diagenetic stage.The compaction and cementation result in destroying primary pores,leading to the loss of porosity by 16.94% and 14.29%, respectively.The intercrystalline pore and dissolution make porosity increase by 0.92% and 5.64% so that the reservoir property is improved.The pore space experienced a complex evolutionary process:reduction of primary pore→development of secondary pore→reduction of secondary pore→coexistence of mixture pore.

Key words: Su77-Zhao51 well region, Shan23 Formation, diagenesis, porosity evolution

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