北羌塘盆地东部上三叠统波里拉组碳酸盐岩矿物特征分析

刘晓; 张启燕; 史维鑫; 葛天助; 宋利强

doi:10.15898/j.ykcs.202212010227

北羌塘盆地东部上三叠统波里拉组碳酸盐岩矿物特征分析

1.
中国地质调查局自然资源实物地质资料中心，河北三河 065201

基金项目: 中国地质调查局地质调查项目 “岩心数字化与应用示范”(DD20230601)

详细信息

作者简介: 刘晓，硕士，工程师，主要从事石油地质和岩心数字化应用。E-mail：sea_251@163.com

通讯作者: 张启燕，硕士，高级工程师，主要从事岩心数字化方向及应用。E-mail：zqy25105@163.com。

中图分类号: P592

收稿日期: 2022-12-01

修回日期: 2023-10-22

录用日期: 2024-01-12

刊出日期: 2024-05-31

Mineralogical Characteristics of Carbonate Rocks of the Upper Triassic Bolila Formation in the Eastern Part of the North Qiangtang Basin

1.
Core and Samples Center of Land and Resources, China Geological Survey, Sanhe 065201, China

More Information

Corresponding author: ZHANG Qiyan, zqy25105@163.com

Received Date: 01 December 2022

Revised Date: 22 October 2023

Accepted Date: 12 January 2024

Publish Date: 31 May 2024

摘要

摘要:
北羌塘东部上三叠统波里拉组是羌塘盆地重点油气勘探目标层位，受沉积和成岩作用影响，地层压实作用强烈，矿物颗粒极小，属于致密油气储层。本文采用数字岩心技术——背散射扫描电镜成像技术(MAPS)和矿物成分定量分析技术(QEMSCAN)，对波里拉组矿物进行微观尺度扫描和分析，表征其矿物成分、颗粒形态、空间分布及结构特征。结果表明：波里拉组方解石以泥晶为主，胶结作用明显，物性致密，孔径小(＜5μm)，局部发生白云化作用，白云石主要为粉-细晶，以自形晶为主，多呈线接触。矿物在纵向呈规律变化：底部为泥灰岩，陆源碎屑含量较高(＞56.57%)，其次为方解石(25.79%)，磨圆度较差，成分成熟度和结构成熟度均较低；中段陆源碎屑矿物和方解石呈条带交错分布，方解石较石英含量增加(方解石47.43%，石英28.54%)，沿晶间普遍发育的草莓状黄铁矿簇直径可达10μm，整体为氧化界面之下的还原环境；顶部以方解石为主(＞90%)，颗粒直径多为10～50μm，颗粒间多呈线接触，粒间孔几乎不发育，局部发生层状白云化作用。矿物特征显示波里拉组沉积物源受浅海碳酸盐岩沉积环境和陆源碎屑输入双重影响，具有典型的混积岩特征，沉积环境从早期陆源碎屑供给较为充足，到晚期以碳酸盐岩沉积为主，整体为海相碳酸盐沉积。
- 波里拉组碳酸盐岩 /
- 矿物微观特征 /
- 沉积环境 /
- 背散射扫描电镜成像技术 /
- 矿物成分定量分析技术
Abstract:
Carbonate rocks of the upper Triassic Bolila Formation in the eastern area of the North Qiangtang Basin are important tight oil and gas reservoirs. Due to the influence of sedimentation and diagenesis, the mineral particles are mostly less than 1mm. Analytical methods such as modular automated processing system (MAPS) based on the backscattered electron and automatic mineral identification system (QEMSCAN) were used to analyze the minerals and to research their composition, morphology and structure on a microscopic scale for four samples. The vertical variation of the minerals shows that at the bottom, the mineral composition is dominated by quartz and calcite, and the roundness of mineral particles is poor. The quartz content is relatively high in the middle. The terrigenous minerals and calcite bands are staggered. At the top, the carbonate mineral content is more than 90%, and layered dolomitization occurs locally. Mineral characteristics indicate that the source of Borila Formation sediments is affected by both shallow marine and terrigenous clastics. The supply of terrigenous clastics was relatively sufficient in the early stage. Subsequently, the supply of terrigenous clastics decreased, and the content of carbonate minerals increased gradually. The sedimentary environment was dominated by carbonate deposits at the late period of the Borila Formation.
- Borilla Formation carbonate /
- mineral microscopic characteristics /
- sedimentary environment /
- MAPS /
- QEMSCAN

HTML全文

图 1 波里拉组岩心表面图像

Figure 1.

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图 2 波里拉组岩心样品矿物成分定量分析结果

Figure 2.

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图 3 波里拉组岩心样品矿物含量对比

Figure 3.

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图 4 波里拉组岩心样品QEMSCAN、MAPS和能谱结果

Figure 4.

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图 5 样品BLL-A矿物微观结构特征

Figure 5.

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图 6 样品BLL-C矿物微观结构特征

Figure 6.

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图 7 样品BLL-B矿物颗粒粒径分布

Figure 7.

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表 1 实验样品地质信息

Table 1. Geological information of experimental samples

样品编号	深度(m)	岩性
BLL-A	236.89	灰色泥晶灰岩
BLL-B	278.74	灰绿色泥晶砂屑灰岩
BLL-C	471.87	灰色砂屑灰岩
BLL-D	489.46	浅灰色泥灰岩

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表 2 波里拉组岩心样品矿物微观特征描述

Table 2. Mineral microscopic characteristics of core samples in the Bolila Formation

样品编号	样品位置 (m)	岩性	主要矿物成分	矿物分布和微观结构特征
BLL-A	236.89	泥晶灰岩	方解石(93.19%)	方解石含量超过90%，其他矿物零星分布
BLL-B	278.74	泥晶砂屑灰岩	方解石(70.04%) 白云石(15.58%)	上部区域颗粒较丰富，主要为石英、方解石，粒径普遍大于200μm，方解石颗粒被细粒的黏土矿物包裹。下部方解石—白云石—石英—黏土矿物形成极细纹层
BLL-C	471.87	砂屑灰岩	方解石(47.43%) 石英(28.54%)	陆源碎屑矿物和方解石呈条带状交错分布，黏土矿物、有机质、黄铁矿均比较发育。长石发生较强的蚀变，黄铁矿沿晶间发育
BLL-D	489.46	泥灰岩	石英(37.08%) 方解石(25.79%)	黏土矿物含量较高且呈层理分布，黄铁矿含量较高

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