Characteristics of parametamorphic rock reservoirs in Pingxi area, Qaidam Basin, NW China

被引：0
|
作者：
Xia Z. [1 ]
Liu Z. [1 ]
Li S. [1 ]
Zhang Y. [2 ]
Wang B. [2 ]
Tian M. [1 ]
Wu J. [2 ]
Zou K. [2 ]
机构：
[1] PetroChina Hangzhou Research Institute of Petroleum, Hangzhou
[2] Research Institute of Petroleum Exploration and Development, PetroChina Qinghai Oil Field Company, Dunhuang
来源：
Shiyou Kantan Yu Kaifa/Petroleum Exploration and Development | 2019年 / 46卷 / 01期
关键词：
Parametamorphic rock; Pingxi area; Pore throat characteristics; Qaidam Basin; Reservoir; Reservoir distribution; Reservoir formation; Rock type;
D O I：
10.11698/PED.2019.01.08
中图分类号：
学科分类号：
摘要：
Based on core, thin-section, scanning electron microscopy (SEM) and well logging data, the characteristics of the parametamorphic rock reservoirs in the Pingxi area were analyzed by means of whole rock X-ray diffraction and micron CT scanning. The parametamorphic rock reservoirs mainly had three types of rocks: slate, crystalline limestone and calc-schist; the original rocks were Ordovician-Silurian marine clastic and carbonate rocks. The three types of parametamorphic rock reservoirs developed three types and six sub-types of reservoir space. The first type of reservoir space was fractures, including structural, weathered and dissolution fractures; the second type was dissolved porosities, including dissolved pores and caves; the third type was nano-sized intercrystalline porosities. The three types of parametamorphic rock reservoirs were different widely in the quantity, volume and radius of pore-throats, and were strongly affected by the type and development degree of fractures. The parametamorphic rock reservoirs were formed by metamorphism, weathering, structural fragmentation and dissolution. Metamorphism reformed the parametamorphic rock reservoirs significantly, breaking the traditional constraint of finding weathering crust at top. The parametamorphic rock reservoirs experienced five formation stages, and their distribution was controlled by rock type, metamorphic degree, ancient geomorphology, and weathering intensity. © 2019, The Editorial Board of Petroleum Exploration and Development. All right reserved.
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页码：89 / 99
页数：10
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