柴北缘冷湖七号地区碳酸盐胶结物特征及其意义

doi:10.11885/j.issn.1674-5086.2018.09.12.01

西南石油大学学报(自然科学版) ›› 2020, Vol. 42 ›› Issue (1): 45-56.DOI: 10.11885/j.issn.1674-5086.2018.09.12.01

柴北缘冷湖七号地区碳酸盐胶结物特征及其意义

王晔桐^1,2, 孙国强¹, 杨永恒^1,2, 秦彩虹³, 李艳明⁴

1. 中国科学院西北生态环境资源研究院, 甘肃兰州 730000;
2. 中国科学院大学, 北京石景山 100049;
3. 中国石油青海油田公司勘探开发研究院, 甘肃敦煌 736202;
4. 中国石油集团东方地球物理勘探有限责任公司研究院地质研究中心, 河北涿州 072751

收稿日期:2018-09-12 出版日期:2020-02-10 发布日期:2020-02-10
通讯作者: 孙国强,E-mail:sguoqiang@lzb.ac.cn
作者简介:王晔桐,1993年生,女,汉族,河北保定人,博士研究生,主要从事含油气盆地构造地质学及石油地质学方面的研究。E-mail:wangyetong16@mails.ucas.edu.cn;孙国强,1977年生,男,汉族,河南洛阳人,副研究员,博士,主要从事含油气盆地构造地质学及石油地质学方面的研究。E-mail:sguoqiang@lzb.ac.cn;杨永恒,1994年生,男,汉族,甘肃张掖人,硕士研究生,主要从事地质工程方面的研究。E-mail:yangyongheng17@mails.ucas.ac.cn;秦彩虹,1984年生,女,汉族,辽宁营口人,工程师,主要从事气田地质开发方面的研究。E-mail:qinchqh@petrochina.com.cn;李艳明,1970年生,男,汉族,吉林九台人,高级工程师,硕士,主要从事地震资料解释及地质综合研究工作。E-mail:liyanming1@cnpc.com.cn
基金资助:
中国科学院“西部之光”人才培养计划（Y304RC1SGQ）；甘肃省自然科学基金（1308RJZA310）；甘肃省重点实验室专项（1309RTSA041）

Characteristics and Significance of Carbonate Cement in the No. 7 Area of Lenghu, Northern Margin of Qaidam Basin

WANG Yetong^1,2, SUN Guoqiang¹, YANG Yongheng^1,2, QIN Caihong³, LI Yanming⁴

1. Northwest Institute of Eco-environment and Resources, Chinese Academy of Sciences, Lanzhou, Gansu 730000, China;
2. University of Chinese Academy of Sciences, Shijingshan, Beijing 100049, China;
3. Research Institute of Exploration and Development, Qinghai Oilfield Company, PetroChina, Dunhuang, Gansu 736202, China;
4. Geological Research Center, Geophysical Research Institute, BGP, CNPC, Zhuozhou, Hebei 072751, China

Received:2018-09-12 Online:2020-02-10 Published:2020-02-10

摘要/Abstract

摘要： 碳酸盐胶结物是碎屑岩储层中最常见的胶结物类型，其形成环境、物质来源、反映的成岩温度对储层研究具有重要意义。通过对柴北缘冷湖七号下干柴沟组砂岩碳酸盐胶结物进行岩石学、矿物学和地球化学分析，研究区下干柴沟组砂岩碳酸盐胶结物包含方解石、含铁方解石、铁方解石和白云石等4种类型。碳同位素（δ¹³C_PDB）和氧同位素（δ¹⁸O_PDB）值分别为8.81‰~3.51‰和8.77‰~17.36‰，平均值分别为5.33‰及13.50‰；利用碳同位素和氧同位素计算出古盐度值和古温度值分别为113.61~102.85和63.03~123.06℃，平均值分别为109.66及94.47℃。反映出研究区下干柴沟组所处成岩阶段为早成岩阶段B期-中成岩阶段A期，形成过程受到有机质脱羧基作用影响，成岩环境偏酸性，成岩流体来自碎屑的析出水和大气淋滤淡水。储层物性除了受成岩环境和温度的影响外，与碳酸盐胶结物含量具有明显的负相关关系，随着碳酸盐胶结物含量的增加，储层的孔隙度和渗透率降低。

关键词: 碳酸盐胶结物, 同位素, 下干柴沟组, 冷湖七号, 储层物性

Abstract: Carbonate cement is the most common type of cement in clastic reservoirs, and its formation environment, material source and diagenetic temperature are of great significance to the reservoir research. Through the analysis of petrology, mineralogy and geochemical of the sandstone carbonate cementation in the Xiaganchaigou Formation of Lenghu No.7 in the northern margin of Qaidam Basin, this paper shows that there are four types of sandstone carbonate cements in the Xiaganchaigou Formation in the study area which are calcite, iron-bearing calcite, iron calcite and dolomite respectively. The content of carbon isotopes (δ¹³C_PDB) and oxygen isotopes (δ¹⁸O_PDB) are 8.81‰~3.51‰ and 8.77‰~17.36‰ respectively, with averages value of 5.33‰ and 13.50‰, respectively. Paleosalinity and temperature are 113.61~102.85 and 63.03~123.06℃ according to carbon isotopes and oxygen isotopes calculation, the average value is 109.66 and 94.47℃, respectively. It reflects that the diagenetic stage of the Xiaganchaigou Formation is from early diagenetic stage B to middle diagenetic stage A, whose formation process is influenced by the decarboxylation of organic matter. The diagenetic environment is acidic, and the diagenetic fluids mainly come from the precipitated water of the clastic and the leaching fresh water in the atmosphere. Besides the influence of diagenetic environment and temperature, the physical property of reservoir has a significant negative correlation with the carbonate cement content. And with the increase of carbonate cement content, the porosity and permeability of the reservoir decrease.

Key words: carbonate cements, isotopes, Xiaganchaigou Formation, Lenghu No. 7 Area, reservoir physical properties

中图分类号:

TE122

王晔桐, 孙国强, 杨永恒, 秦彩虹, 李艳明. 柴北缘冷湖七号地区碳酸盐胶结物特征及其意义[J]. 西南石油大学学报(自然科学版), 2020, 42(1): 45-56.

WANG Yetong, SUN Guoqiang, YANG Yongheng, QIN Caihong, LI Yanming. Characteristics and Significance of Carbonate Cement in the No. 7 Area of Lenghu, Northern Margin of Qaidam Basin[J]. 西南石油大学学报(自然科学版), 2020, 42(1): 45-56.

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柴北缘冷湖七号地区碳酸盐胶结物特征及其意义

Characteristics and Significance of Carbonate Cement in the No. 7 Area of Lenghu, Northern Margin of Qaidam Basin

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