沙河子组致密砂砾岩成岩相及孔隙演化分析

doi:10.11885/j.issn.1674-5086.2019.11.12.02

西南石油大学学报(自然科学版) ›› 2022, Vol. 44 ›› Issue (1): 13-26.DOI: 10.11885/j.issn.1674-5086.2019.11.12.02

沙河子组致密砂砾岩成岩相及孔隙演化分析

冉清昌¹, 钟安宁¹, 周翔¹, 王超², 杨丹丹³

1. 中国石油大庆油田勘探开发研究院，黑龙江大庆 163712;
2. 中国石油长城钻探工程有限公司，辽宁盘锦 124010;
3. 中国石油大庆油田井下作业分公司，黑龙江大庆 163716

收稿日期:2019-11-12 发布日期:2022-01-25
通讯作者: 周翔，E-mail：zhouxiang2206@163.com
作者简介:冉清昌，1965年生，男，汉族，辽宁建平人，高级工程师，博士(后)，主要从事油气地质与地球化学等方面的研究工作。E-mail：ranqingchang@petrochina.com.cn;
钟安宁，1984年生，男，汉族，黑龙江佳木斯人，工程师，主要从事非常规储层评价等方面的研究工作。E-mail：zhonganning@petrochina.com.cn;
周翔，1988年生，男，汉族，河南信阳人，工程师，博士，主要从事非常规储层地质与成藏机理等方面的研究工作。E-mail：zhouxiang2206@163.com;
王超，1986年生，男，汉族，山东费县人，工程师，硕士，主要从事储层预测与改造等方面的研究工作。E-mail：wchao.gwdc@cnpc.com.cn;
杨丹丹，1983年生，女，汉族，湖北荆门人，工程师，主要从事储层地质学与储层改造研究。E-mail：jx_yangdandan@petrochina.com.cn
基金资助:
国家重大科技专项（2016ZX05001–002）; 中国石油天然气股份有限公司重大科技专项（2016E–01）

Diagenetic Facies and Porosity Evolution of Tight Sandstone in Shahezi Formation

RAN Qingchang¹, ZHONG Anning¹, ZHOU Xiang¹, WANG Chao², YANG Dandan³

1. Exploration and Production Research Institute, Daqing Oilfield, CNPC, Daqing, Heilongjiang 163712, China;
2. Great Wall Drilling Company, CNPC, Panjin, Liaoning 124010, China;
3. Downhole Operation Branch Company, Daqing Oilfield, CNPC, Daqing, Heilongjiang 163716, China

Received:2019-11-12 Published:2022-01-25

摘要/Abstract

摘要： 通过岩芯、砂岩薄片、扫描电镜和物性、X衍射等综合分析，系统剖析徐家围子断陷沙河子组致密砂砾岩储层成岩相特征及成因。结果表明，沙河子组发育泥质杂基充填相、长石岩屑溶蚀相、石英次生加大相、绿泥石环边胶结相和碳酸盐胶结相等5种成岩相；由沉积作用形成的碎屑矿物组分、结构差异决定了各成岩相初始孔隙度，各成岩相中成岩作用类型和强度差异导致其孔隙演化路径各不相同，造成平面上宏观物性和微观孔隙结构的差异性分布。辫状河三角洲前缘沉积中长石岩屑溶蚀相和扇三角洲前缘沉积中绿泥石环边胶结相在天然气充注前仍具有较高的物性，是研究区致密砂砾岩最有利的成岩相带；泥质杂基充填相、碳酸盐胶结相和石英次生加大相在天然气充注前已完成致密化过程，不利于天然气聚集成藏。

关键词: 成岩相, 致密砂岩, 孔隙演化, 沙河子组, 徐家围子断陷

Abstract: In order to make clear the characteristic and genesis of tight sandstone diagenetic facies in Shahezi Formation, the core, thin-section, SEM, physical properties and X-ray analysis have been combined and systematically studied in Xujiaweizi Fault Depression. The result is that there are five kinds of diagenetic facies such as muddy-filling diagenetic facies, feldspar-debris dissolution diagenetic facies, quartz overgrowth diagenetic facies, chlorite cementation diagenetic facies and carbon cementation diagenetic facies. The difference of mineral constituent and texture between different diagenesis facies which is controlled by sedimentation is the origin of porosity evolution, the type of main diagenesis and its intensity determine the porosity evolution path in different diagenetic facies and result in spatial differentiation of properties in macroscopic and pore structure in microscopic. Even though diagenesis destroy a lot of primary pore in feldspar-debris dissolution diagenetic facies in braided delta front and chlorite cementation diagenetic facies in fan delta front, they still retain a high property before gas injection in stage B of middle diagenesis phase, which make them a favorable reservoir for gas accumulation. The reservoir in muddy-filling diagenetic facies, carbon cementation diagenetic facies and quartz overgrowth have loss most of primary pore and complete the densification process before organic matters get matured, which make it difficult for gas injection and accumulation.

Key words: diagenetic facies, tight sandstone, porosity evolution, Shahezi Formation, Xujiaweizi Falut Depression

中图分类号:

TE121

冉清昌, 钟安宁, 周翔, 王超, 杨丹丹. 沙河子组致密砂砾岩成岩相及孔隙演化分析[J]. 西南石油大学学报(自然科学版), 2022, 44(1): 13-26.

RAN Qingchang, ZHONG Anning, ZHOU Xiang, WANG Chao, YANG Dandan. Diagenetic Facies and Porosity Evolution of Tight Sandstone in Shahezi Formation[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2022, 44(1): 13-26.

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沙河子组致密砂砾岩成岩相及孔隙演化分析

Diagenetic Facies and Porosity Evolution of Tight Sandstone in Shahezi Formation

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