Full
SUN Chunyan,born in 1988,is a PhD and a senior engineer,is engaged in geological exploration and research work. E-mail: schunyan89@163.com.
Outline
The braided river delta sandbodies containing coal developed in the Lower Jurassic in the piedmont southwestern Tarim Basin,the overall exploration level is relatively low,with significant differences in the properties of source rocks and reservoir characteristics in different regions,which in turn restricts the oil and gas exploration process. This article takes the sandy reservoirs of the Lower Jurassic in the Fusha and Aketao regions as examples,and fully utilizes various rock and mineral testing and analysis methods to analyze the differences in the properties of the parent rock and reservoirs. The results show that the source rocks in the Fusha area are mainly Early Proterozoic metamorphic rocks. The reservoir exhibits characteristics of “poor feldspar and rich metamorphic rock debris”(Q57.3F4.8R37.9),and the high content of plastic debris leads to strong burial compaction in the later stage,with a compaction reduction of up to 20.11%. Late cementation and dissolution were weak. The reservoir space is a small amount of residual primary pores,and the current porosity is only 8.98%. Aketao area is the Late Paleozoic-Triassic extrusive rock,and the reservoir exhibits the characteristics of “rich feldspar and extrusive rock debris”(Q33.2F17.5R49.3). The Compaction is weak,and the early cementation is strong,The high content of soluble components and the influence of organic acids lead to strong dissolution,with a dissolution pore increase of 4.03%. The development of intergranular and intragranular dissolution pores improves the reservoir quality,and the current porosity is 12.95%. Comprehensive research suggests that the properties of the parent rock lead to differences in the petrological characteristics,diagenetic intensity,diagenetic evolution sequence,reservoir space types,and pore evolution processes of the Lower Jurassic sandstone reservoirs in the piedmont southwestern Tarim Basin. This study provides theoretical support for the prediction of high-quality sandstone reservoirs in the Jurassic period in the piedmont southwestern Tarim Basin.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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