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12鄂尔多斯盆地长7段云母特征及其对储层的影响
断块油气田
2021年 28卷 第2期
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Title
Characteristics of Member 7 mica of Yanchang Formation in Ordos Basin and its effects on reservoirs
单位
1．西南石油大学地球科学技术学院，四川 成都 610500
中国石油青海油田分公司采气二厂，甘肃 敦煌 736202
摘要
鄂尔多斯盆地上三叠统延长组长7段致密砂岩储层是我国非常规油气勘探的重点研究目标。文中通过岩石铸体薄片和扫描电镜观察，结合取心和测井资料，研究了延长组长7段的云母类型、体积分数及其对储层的影响。研究表明：目的层致密砂岩主要发育黑云母、水云母和绢云母；云母分布受控于母岩性质和沉积环境，云母体积分数在鄂尔多斯盆地东北部最高，主要与陆源差异和沉积环境有关；云母具有破坏储层储集空间的作用，在不同的沉积环境下，云母体积分数对储层的影响有差异；与云母有关的成岩作用主要有压实作用、交代作用和蚀变作用。该研究为鄂尔多斯盆地延长组长7段的储层评价提供了依据。
Abstract
The tight sandstone reservoir of the Member 7 of Yanchang Formation in the upper Triaasic in the Ordos Basin is the key target of unconventional oil and gas exploration in China. In this paper, the types and volume contents of mica of Member 7 of Yanchang Formation and its effects on reservoirs were studied in detail by thin sections, scanning electron microscopy (SEM), coring data and well logging data. The results show that there are three types of mica, including biotite, hydromica and sericite. The distribution of mica were controlled by the sedimentary source and the sedimentary environment, and its volume fraction was the highest in the northeast of Ordos Basin, which is related to the continental difference and sedimentary environment. The influence of mica on the reservoir is negative, but the influence of mica content on the reservoir is different in different sedimentary environments. The diagenesis related to mica includes compaction, metasomatism and alteration. This study can provide basic data for reservoir evaluation of Member 7 of Yanchang Formation in Ordos Basin.
关键词：
云母特征;
致密砂岩储层;
成岩作用;
延长组;
鄂尔多斯盆地;
Keywords:
characteristics of mica;
tight sandstone reservoir;
diagenesis;
Yanchang Formation;
Ordos Basin;
DOI
10.6056/dkyqt202102009
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