火山岩内幕型储层特征与主控因素——以准噶尔盆地滴南凸起滴水泉西断裂下盘为例

doi:10.3969/j.issn.1672-7703.2023.02.011

摘要/Abstract

摘要： 随着火山岩油气藏勘探开发的持续推进，已证实在距离火山岩风化壳较深的“内幕”同样具有形成大规模油气藏的潜力，但由于其成储机理与风化壳储层截然不同，目前对火山岩内幕型储层特征、主控因素及分布规律的相关研究仍处于起步阶段。文章以准噶尔盆地滴南凸起滴水泉西断裂下盘为例，基于岩心薄片、物性、测井及地震资料，开展火山岩内幕型储层识别与深度划分、岩性岩相及物性特征分析，明确火山岩内幕型储层发育的主控因素。研究结果表明：（1）内幕型储层主要分布在不整合面以下250～600m的范围内。（2）有利岩相（岩性）主要为爆发相热基浪亚相（含角砾凝灰岩）、爆发相空落相亚相（凝灰岩质角砾岩）。（3）储集空间以溶蚀孔为主，其次为构造缝。（4）有利储层主要控制因素为古地貌、断裂分布、火山口分布、火山喷发期次等，具体表现为：火山口附近相对低洼的凹槽带是内幕型储层发育的有利场所；近火山口处及断裂附近内幕型储层相对发育；内幕型储层纵向分布受火山活动旋回的影响，上覆烃源岩层的火山岩内幕岩体更容易被改造为内幕型储层。

关键词: 准噶尔盆地, 火山岩油气藏, 内幕型储层, 主控因素, 滴水泉西断裂下盘

Abstract: Associated with the continuous implementation of exploration and development of volcanic oil and gas reservoirs, the “inner reservoir” with a large distance below the weathering crust volcanic rocks has been proved to have potential to form large-scale oil and gas reservoirs. However, the study on the characteristics, main controlling factors and distribution law of inner volcanic reservoir is still in the initial stage due to the significantly different reservoir formation mechanism from that of the weathering crust reservoir. By taking the footwall of West Dishuiquan Fault in Dinan Bulge as an example, core samples, thin section, physical properties, logging and seismic data are used to conduct the identification and depth division of inner volcanic reservoir, analyze the lithology, lithofacies and physical properties, and determine the main controlling factors for the development of inner volcanic reservoir. The results show that: (1) The inner reservoir is mainly distributed in the range of 250-600 m below the unconformity surface; (2) The favorable lithofacies (lithology) of the inner reservoir are thermal base wave subfacies (breccia tuff) of explosive facies and the caved subfacies (tuffaceous breccia) of explosive facies; (3) The reservoir space is dominated by dissolution pores, followed by tectonic fissures; (4) The main controlling factors of the favorable reservoir include paleogeomorphology, fault distribution, crater distribution, and volcanic eruption stages. The low-lying trough near the crater is favorable area for the development of inner reservoir. The inner volcanic reservoir is relatively developed near the crater and fault. The vertical distribution of inner reservoir is affected by volcanic cycles, and the inner volcanic rocks overlaid by source rocks are more easily transformed into inner reservoir.

中图分类号:

TE111.3

蒋佳兵, 陈如鹤, 李小刚, 解远刚, 杨丹, 阳程宇, 刘忠华, 徐少华, 熊益学, 徐正建. 火山岩内幕型储层特征与主控因素——以准噶尔盆地滴南凸起滴水泉西断裂下盘为例[J]. 中国石油勘探, 2023, 28(2): 119-132.

Jiang Jiabing, Chen Ruhe, Li Xiaogang, Xie Yuangang, Yang Dan, Yang Chengyu, Liu Zhonghua, Xu Shaohua, Xiong Yixue, Xu Zhengjian. Characteristics and main controlling factors of inner volcanic reservoir: a case study of the footwall of West Dishuiquan Fault in Dinan Bulge, Junggar Basin[J]. China Petroleum Exploration, 2023, 28(2): 119-132.

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