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Preliminary Exploration of Reservoir Division Scheme for Vesiculate Amygdaloidal Basalt—A Case Study of the First Lithologic Member of Hala'alate Formation in Urho Area of Xinjiang, China(PDF)

《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

Issue:
2023年第05期
Page:
1210-1226
Research Field:
庆贺汤中立院士从事地质工作七十周年专辑
Publishing date:

Info

Title:
Preliminary Exploration of Reservoir Division Scheme for Vesiculate Amygdaloidal Basalt—A Case Study of the First Lithologic Member of Hala'alate Formation in Urho Area of Xinjiang, China
Author(s):
ZHANG Jing1;  LI Yong-jun2*;  QIN Jian-hua1;  LI Si-yuan1;  AKEDAN?Sikandier1;  WANG Pan-long2;  WANG Xin1;  HUANG Jia-xuan2;  ZHANG Xin-yuan2
(1. Research Institute of Exploration and Development, Xinjiang Oilfield Company, PetroChina, Karamay 834000, Xinjiang, China; 2. School of Earth Science and Resources, Chang'an University, Xi'an 710054, Shaanxi, China)
Keywords:
vesiculate amygdaloidal basalt;  stomatal unit area proportion;  stomatal connectivity;  amygdaloid connectivity;  proportion of porosity enhancement stemming from amygdaloid dissolution;  reservoir performance evaluation;  Hala'alate Formation;  Junggar Basin
PACS:
P583; P618.13
DOI:
10.19814/j.jese.2023.08020
Abstract:
Vesiculate amygdaloidal basalt stands out as a recently recognized primary reservoir within Urho area, the northwestern periphery of Junggar Basin. Notably, a significant proportion of the volcanic rock-type oil and gas reservoirs discovered in this region is affiliated with the volcanic formations of Hala'alate Formation. Within this stratigraphic unit, a distinct segment characterized by vesiculate amygdaloidal basalt exhibits remarkable development, encompassing over 78% of the total thickness of the strata. This particular interval serves as an optimal candidate for in-depth studies on volcanic rock reservoir characteristics. The amygdaloid bodies in these basalts predominantly consist of secondary calcite, which demonstrates a high solubility in water. These amygdaloid bodies often assume circular to semi-circular configurations, with many interconnected in patterns resembling networks, branches, or irregular structures. Statistical analyses corroborate that subjecting these amygdaloid bodies to dissolution in wellbore fluids results in a significant increase in porosity, approximately ranging from 3.6 to 4.5 times, effectively rendering them highly favorable as reservoir lithology. A robust assessment of the reservoir quality considers three distinct parameters, including stomatal unit area proportion, the proportion of connectivity, and the proportion of porosity enhancement stemming from amygdaloid dissolution. When all three of these criteria achieve excellence, the reservoir attains a classification of excellent reservoir. Meanwhile, a classification of favorable reservoir is attributed when a minimum of two criteria reaches an excellent level. A prudent estimation indicates that over 50% of the 110 samples obtained from a dataset surpass the established criteria for a favorable reservoir, thus demonstrating a noteworthy potential for reservoir development. The above reservoir division scheme provides a reference for establishing comprehensive evaluation scheme of evaluating the reservoir performance specific to vesiculate amygdaloidal basalts.

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Last Update: 2023-10-15