石油与天然气地质 ›› 2022, Vol. 43 ›› Issue (4): 902-916.doi: 10.11743/ogg20220413

• 油气地质 • 上一篇    下一篇

广西雪峰山南缘石炭系寺门组储层特征及其控制因素

刘自亮1,2(), 张明何1,2(), 刘四兵1,2, 王均杰3, 郝景宇3, 陈义才1,2, 周月1,2   

  1. 1.成都理工大学 油气藏地质及开发工程国家重点实验室,四川 成都 610059
    2.成都理工大学 能源学院,四川 成都 610059
    3.中国石化 勘探分公司,四川 成都 610041
  • 收稿日期:2022-03-22 修回日期:2022-05-05 出版日期:2022-07-14 发布日期:2022-07-14
  • 通讯作者: 张明何 E-mail:bugliu2001@163.com;1102553662@qq.com
  • 作者简介:刘自亮(1978—),男,博士、副教授,沉积学、储层地质学。E?mail: bugliu2001@163.com
  • 基金资助:
    国家重点研发计划专项(2018YFC0604201);油气藏地质及开发工程国家重点实验室(成都理工大学)开放基金项目(PLC20190103)

Reservoir characteristics and controlling factors of the Carboniferous Simen Formation at the southern margin of Xuefeng Mountain, Guangxi Zhuang Autonomous Region, China

Ziliang Liu1,2(), Minghe Zhang1,2(), Sibing Liu1,2, Junjie Wang3, Jingyu Hao3, Yicai Chen1,2, Yue Zhou1,2   

  1. 1.State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Chengdu University of Technology,Chengdu,Sichuan 610059,China
    2.College of Energy,Chengdu University of Technology,Chengdu,Sichuan 610059,China
    3.Exploration Company,SINOPEC,Chengdu,Sichuan 610041,China
  • Received:2022-03-22 Revised:2022-05-05 Online:2022-07-14 Published:2022-07-14
  • Contact: Minghe Zhang E-mail:bugliu2001@163.com;1102553662@qq.com

摘要:

广西雪峰山南缘石炭系寺门组具有较好的油气成藏背景条件,查明寺门组储层的形成发育机制及其控制因素对该区油气勘探具有重要意义。利用野外露头、钻井和岩心资料,结合运用扫描电镜、铸体薄片、包裹体和孔-渗分析等手段,明确了广西雪峰山南缘石炭系寺门组储层的基本特征,探讨了储层发育的控制因素及优质储层形成模式和有利区分布。研究表明,寺门组储层岩石类型主要为细粒石英砂岩和岩屑质石英砂岩;储集空间包括原生粒间孔、次生溶蚀孔和裂缝;储层类型属于孔隙-裂缝型和孔隙型,整体呈低孔、低渗特征。储层质量主要受沉积、成岩及构造作用的共同控制:沿岸砂坝、砂泥质滨岸和混合坪微相控制了寺门组储层砂体的分布;强烈的压实作用是储层致密化的最主要原因,造成的孔隙损失率约85.2 %;溶蚀作用使储层质量得到有效提升(增孔量约2.3 %);构造裂缝极大地促进了储层的输导能力,使局部地区仍具备优质储层发育的物性条件。最后,建立了储层发育模式,预测研究区存在德胜和洛埠2个有利储层分布区。

关键词: 储层特征, 储层发育模式, 储层有利区分布, 致密砂岩, 寺门组, 石炭系, 雪峰山南缘

Abstract:

The Carboniferous Simen Formation located at the southern margin of Xuefeng Mountain in Guangxi Zhuang Autonomous Region of China is of good hydrocarbon accumulation conditions. It is of great significance to finding out the formation and development mechanism and controlling factors of Simen Formation reservoirs regarding the petroleum exploration therein. An integration of field outcrop observation and various data including drilling and core, scanning electron microscopy (SEM), casting thin section, inclusions, as well as porosity and permeability, is applied to clarify the basic characteristics of the Carboniferous Simen Formation reservoir at the southern margin of Xuefeng Mountain; and meanwhile the factors controlling reservoir development, formation mode of high-quality reservoirs, and distribution of play fairways are discussed. The research results show that the reservoir rocks of Simen Formation mainly include fine-grained quartzite sandstone and detrital quartzite sandstone, which are dominated by reservoir spaces of primary intergranular pores, secondary dissolved pores and fractures. The reservoirs are of the pore-fracture type and pore type, characterized by low porosity and low permeability as a whole. On the other hand, sedimentation, diagenesis and tectonism jointly control the reservoir quality, that is, microfacies of coastal sand bar, sandy-argillaceous shore and mixed flat control the distribution of reservoir sand bodies in the Simen Formation. Strong compaction is the primary cause for tight reservoirs, which could result in a pore loss rate of about 85.2 %, while dissolution effectively improves the reservoir quality (with a porosity rise of about 2.3 %), and structural fractures greatly promote the carrier system of the reservoirs with some areas still favorable for the development of high-quality reservoirs in terms of physical conditions. Finally, a model for the reservoir development is established, by which two favorable areas for reservoir distribution of Desheng and Luobu counties are mapped in the study area.

Key words: reservoir characteristics, reservoir development model, play fairway distribution, tight sandstone, Simen Formation, Carboniferous, southern margin of Xuefeng Mountain

中图分类号: