新疆石油地质 ›› 2025, Vol. 46 ›› Issue (3): 296-307.doi: 10.7657/XJPG20250306

• 油气勘探 • 上一篇    下一篇

庆阳气田山1段差异性成岩作用及其对储集层的影响

曹江骏a,b(), 张道锋a,b, 王继平a,b, 周游b,c, 李笑天a,b, 李娅a,b, 范倩倩a,b, 董倩云a,b   

  1. 中国石油 长庆油田分公司 a.勘探开发研究院;b.低渗透油气田勘探开发国家工程实验室;c.气田开发事业部,西安 710018
  • 收稿日期:2024-12-04 修回日期:2024-12-17 出版日期:2025-06-01 发布日期:2025-06-13
  • 作者简介:曹江骏(1993-),男,陕西西安人,工程师,博士,沉积与储层地质学,(Tel)029-86978132(Email)cjjun_cq@petrochina.com.cn
  • 基金资助:
    中国石油重大科技专项(2023ZZ25);中国石油长庆油田分公司项目(2025D4QP10)

Differential Diagenesis of Shan-1 Member and Its Impact on Reservoirs in Qingyang Gas Field

CAO Jiangjuna,b(), ZHANG Daofenga,b, WANG Jipinga,b, ZHOU Youb,c, LI Xiaotiana,b, LI Yaa,b, FAN Qianqiana,b, DONG Qianyuna,b   

  1. PetroChina Changqing Oilfield Company, a. Research Institute of Exploration and Development; b. National Engineering Laboratory for Exploration and Development of Low-Permeability Oil & Gas Fields;c.Gas Field Development Department, Xi’an, Shaanxi 710018, China
  • Received:2024-12-04 Revised:2024-12-17 Online:2025-06-01 Published:2025-06-13

摘要:

庆阳气田二叠系山1段埋藏深度大,成岩作用复杂,成岩-孔隙演化差异大,对有利储集层认识不清晰。利用铸体薄片、扫描电镜、高压压汞、阴极发光、自生黏土矿物X射线衍射等资料,结合前人研究成果,对庆阳气田山1段成岩作用进行研究。结果表明:庆阳气田山1段从西南至东北依次发育曲流河三角洲平原亚相及前缘亚相,前缘亚相储集层较平原亚相储集层而言,填隙物含量低,孔隙发育,孔喉结构好,物性较高;沉积作用控制了储集层的初始孔隙度,差异性成岩-孔隙演化影响了储集层的致密化程度,前缘亚相储集层初始孔隙度较高,压实-胶结作用降低了36.34%的孔隙度,溶蚀作用升高了4.28%的孔隙度,现今平均孔隙度为7.13%,平原亚相储集层初始孔隙度较低,压实-胶结作用降低了37.72%的孔隙度,溶蚀作用升高了3.65%的孔隙度,现今平均孔隙度为4.43%;前缘亚相储集层经历了中等压实作用降低孔隙度—中等胶结作用降低孔隙度—中等溶蚀作用升高孔隙度的致密化过程,储集层质量较好;平原亚相储集层经历了强压实作用降低孔隙度—中等胶结作用降低孔隙度—弱溶蚀作用升高孔隙度的致密化过程,储集层质量较差。

关键词: 鄂尔多斯盆地, 庆阳气田, 山1段, 储集层质量, 成岩-孔隙演化, 成岩作用

Abstract:

The Permian Shan-1 member in the Qingyang gas field is characterized by large burial depth, complex diagenetic processes, and differential diagenesis-pore evolution, leading to unclear understanding of favorable reservoirs. By using the data from cast thin sections, scanning electron microscopy (SEM), physical properties, cathodoluminescence (CL), and X-ray diffraction (XRD) of authigenic clay minerals, and combining with previous research findings, the diagenesis of the Shan-1 member was investigated. The results indicate that the Shan-1 member exhibits a transition from meandering-river delta plain subfacies to delta front subfacies from southwest to northeast. Compared with delta plain reservoirs, the delta front reservoirs are featured with fewer interstitial materials, developed pores, better pore-throat structure, and favorable physical properties. Sedimentation controls the initial porosity, while differential diagenesis-pore evolution determines the degree of reservoir compaction. The delta front reservoirs are found with high initial porosity, which was then reduced by 36.34% due to compaction and cementation and enhanced by 4.28% due to dissolution, resulting in a present-day average porosity of 7.13%. In contrast, the delta plain reservoirs have low initial porosity, which was then reduced by 37.72% due to compaction and cementation and enhanced by 3.65% due to dissolution, resulting in a present-day average porosity of 4.43%. The delta front reservoirs are of good quality, as a result of a densification process from moderate compaction reducing porosity, to moderate cementation further decreasing porosity, and to moderate dissolution enhancing porosity. In contrast, the delta plain reservoirs show poor quality, after a densification process from strong compaction reducing porosity, to moderate cementation further decreasing porosity, and to weak dissolution enhancing porosity.

Key words: Ordos Basin, Qingyang gas field, Shan-1 member, reservoir quality, diagenesis-pore evolution, diagenesis

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